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Merge branch 'master' into devel-3.2
[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, char *map)
562 {
563 struct mdp_superblock_1 *sb = st->sb;
564 int working = 0;
565 unsigned int i;
566 unsigned int role;
567 unsigned int map_disks = info->array.raid_disks;
568
569 info->array.major_version = 1;
570 info->array.minor_version = st->minor_version;
571 info->array.patch_version = 0;
572 info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
573 info->array.level = __le32_to_cpu(sb->level);
574 info->array.layout = __le32_to_cpu(sb->layout);
575 info->array.md_minor = -1;
576 info->array.ctime = __le64_to_cpu(sb->ctime);
577 info->array.utime = __le64_to_cpu(sb->utime);
578 info->array.chunk_size = __le32_to_cpu(sb->chunksize)*512;
579 info->array.state =
580 (__le64_to_cpu(sb->resync_offset) >= __le64_to_cpu(sb->size))
581 ? 1 : 0;
582
583 info->data_offset = __le64_to_cpu(sb->data_offset);
584 info->component_size = __le64_to_cpu(sb->size);
585
586 info->disk.major = 0;
587 info->disk.minor = 0;
588 info->disk.number = __le32_to_cpu(sb->dev_number);
589 if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
590 __le32_to_cpu(sb->max_dev) > 512)
591 role = 0xfffe;
592 else
593 role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
594
595 info->disk.raid_disk = -1;
596 switch(role) {
597 case 0xFFFF:
598 info->disk.state = 0; /* spare: not active, not sync, not faulty */
599 break;
600 case 0xFFFE:
601 info->disk.state = 1; /* faulty */
602 break;
603 default:
604 info->disk.state = 6; /* active and in sync */
605 info->disk.raid_disk = role;
606 }
607 info->events = __le64_to_cpu(sb->events);
608 sprintf(info->text_version, "1.%d", st->minor_version);
609 info->safe_mode_delay = 200;
610
611 memcpy(info->uuid, sb->set_uuid, 16);
612
613 strncpy(info->name, sb->set_name, 32);
614 info->name[32] = 0;
615
616 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RECOVERY_OFFSET))
617 info->recovery_start = __le32_to_cpu(sb->recovery_offset);
618 else
619 info->recovery_start = MaxSector;
620
621 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
622 info->reshape_active = 1;
623 info->reshape_progress = __le64_to_cpu(sb->reshape_position);
624 info->new_level = __le32_to_cpu(sb->new_level);
625 info->delta_disks = __le32_to_cpu(sb->delta_disks);
626 info->new_layout = __le32_to_cpu(sb->new_layout);
627 info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
628 if (info->delta_disks < 0)
629 info->array.raid_disks -= info->delta_disks;
630 } else
631 info->reshape_active = 0;
632
633 if (map)
634 for (i=0; i<map_disks; i++)
635 map[i] = 0;
636 for (i = 0; i < __le32_to_cpu(sb->max_dev); i++) {
637 role = __le16_to_cpu(sb->dev_roles[i]);
638 if (/*role == 0xFFFF || */role < (unsigned) info->array.raid_disks) {
639 working++;
640 if (map && role < map_disks)
641 map[role] = 1;
642 }
643 }
644
645 info->array.working_disks = working;
646 }
647
648 static struct mdinfo *container_content1(struct supertype *st, char *subarray)
649 {
650 struct mdinfo *info;
651
652 if (subarray)
653 return NULL;
654
655 info = malloc(sizeof(*info));
656 getinfo_super1(st, info, NULL);
657 return info;
658 }
659
660 static int update_super1(struct supertype *st, struct mdinfo *info,
661 char *update,
662 char *devname, int verbose,
663 int uuid_set, char *homehost)
664 {
665 /* NOTE: for 'assemble' and 'force' we need to return non-zero
666 * if any change was made. For others, the return value is
667 * ignored.
668 */
669 int rv = 0;
670 struct mdp_superblock_1 *sb = st->sb;
671
672 if (strcmp(update, "force-one")==0) {
673 /* Not enough devices for a working array,
674 * so bring this one up-to-date
675 */
676 if (sb->events != __cpu_to_le64(info->events))
677 rv = 1;
678 sb->events = __cpu_to_le64(info->events);
679 } else if (strcmp(update, "force-array")==0) {
680 /* Degraded array and 'force' requests to
681 * maybe need to mark it 'clean'.
682 */
683 switch(__le32_to_cpu(sb->level)) {
684 case 5: case 4: case 6:
685 /* need to force clean */
686 if (sb->resync_offset != MaxSector)
687 rv = 1;
688 sb->resync_offset = MaxSector;
689 }
690 } else if (strcmp(update, "assemble")==0) {
691 int d = info->disk.number;
692 int want;
693 if (info->disk.state == 6)
694 want = info->disk.raid_disk;
695 else
696 want = 0xFFFF;
697 if (sb->dev_roles[d] != __cpu_to_le16(want)) {
698 sb->dev_roles[d] = __cpu_to_le16(want);
699 rv = 1;
700 }
701 if (info->reshape_active &&
702 sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE) &&
703 info->delta_disks >= 0 &&
704 info->reshape_progress < __le64_to_cpu(sb->reshape_position)) {
705 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
706 rv = 1;
707 }
708 if (info->reshape_active &&
709 sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE) &&
710 info->delta_disks < 0 &&
711 info->reshape_progress > __le64_to_cpu(sb->reshape_position)) {
712 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
713 rv = 1;
714 }
715 } else if (strcmp(update, "linear-grow-new") == 0) {
716 unsigned int i;
717 int rfd, fd;
718 unsigned int max = __le32_to_cpu(sb->max_dev);
719
720 for (i=0 ; i < max ; i++)
721 if (__le16_to_cpu(sb->dev_roles[i]) >= 0xfffe)
722 break;
723 sb->dev_number = __cpu_to_le32(i);
724 info->disk.number = i;
725 if (max >= __le32_to_cpu(sb->max_dev))
726 sb->max_dev = __cpu_to_le32(max+1);
727
728 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
729 read(rfd, sb->device_uuid, 16) != 16) {
730 __u32 r[4] = {random(), random(), random(), random()};
731 memcpy(sb->device_uuid, r, 16);
732 }
733 if (rfd >= 0)
734 close(rfd);
735
736 sb->dev_roles[i] =
737 __cpu_to_le16(info->disk.raid_disk);
738
739 fd = open(devname, O_RDONLY);
740 if (fd >= 0) {
741 unsigned long long ds;
742 get_dev_size(fd, devname, &ds);
743 close(fd);
744 ds >>= 9;
745 if (__le64_to_cpu(sb->super_offset) <
746 __le64_to_cpu(sb->data_offset)) {
747 sb->data_size = __cpu_to_le64(
748 ds - __le64_to_cpu(sb->data_offset));
749 } else {
750 ds -= 8*2;
751 ds &= ~(unsigned long long)(4*2-1);
752 sb->super_offset = __cpu_to_le64(ds);
753 sb->data_size = __cpu_to_le64(
754 ds - __le64_to_cpu(sb->data_offset));
755 }
756 }
757 } else if (strcmp(update, "linear-grow-update") == 0) {
758 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
759 sb->dev_roles[info->disk.number] =
760 __cpu_to_le16(info->disk.raid_disk);
761 } else if (strcmp(update, "resync") == 0) {
762 /* make sure resync happens */
763 sb->resync_offset = 0ULL;
764 } else if (strcmp(update, "uuid") == 0) {
765 copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);
766
767 if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
768 struct bitmap_super_s *bm;
769 bm = (struct bitmap_super_s*)(st->sb+1024);
770 memcpy(bm->uuid, sb->set_uuid, 16);
771 }
772 } else if (strcmp(update, "no-bitmap") == 0) {
773 sb->feature_map &= ~__cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
774 } else if (strcmp(update, "homehost") == 0 &&
775 homehost) {
776 char *c;
777 update = "name";
778 c = strchr(sb->set_name, ':');
779 if (c)
780 strncpy(info->name, c+1, 31 - (c-sb->set_name));
781 else
782 strncpy(info->name, sb->set_name, 32);
783 info->name[32] = 0;
784 } else if (strcmp(update, "name") == 0) {
785 if (info->name[0] == 0)
786 sprintf(info->name, "%d", info->array.md_minor);
787 memset(sb->set_name, 0, sizeof(sb->set_name));
788 if (homehost &&
789 strchr(info->name, ':') == NULL &&
790 strlen(homehost)+1+strlen(info->name) < 32) {
791 strcpy(sb->set_name, homehost);
792 strcat(sb->set_name, ":");
793 strcat(sb->set_name, info->name);
794 } else
795 strcpy(sb->set_name, info->name);
796 } else if (strcmp(update, "devicesize") == 0 &&
797 __le64_to_cpu(sb->super_offset) <
798 __le64_to_cpu(sb->data_offset)) {
799 /* set data_size to device size less data_offset */
800 struct misc_dev_info *misc = (struct misc_dev_info*)
801 (st->sb + 1024 + 512);
802 printf("Size was %llu\n", (unsigned long long)
803 __le64_to_cpu(sb->data_size));
804 sb->data_size = __cpu_to_le64(
805 misc->device_size - __le64_to_cpu(sb->data_offset));
806 printf("Size is %llu\n", (unsigned long long)
807 __le64_to_cpu(sb->data_size));
808 } else if (strcmp(update, "_reshape_progress")==0)
809 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
810 else
811 rv = -1;
812
813 sb->sb_csum = calc_sb_1_csum(sb);
814 return rv;
815 }
816
817 static int init_super1(struct supertype *st, mdu_array_info_t *info,
818 unsigned long long size, char *name, char *homehost, int *uuid)
819 {
820 struct mdp_superblock_1 *sb;
821 int spares;
822 int rfd;
823 char defname[10];
824
825 if (posix_memalign((void**)&sb, 512, (1024 + 512 +
826 sizeof(struct misc_dev_info))) != 0) {
827 fprintf(stderr, Name
828 ": %s could not allocate superblock\n", __func__);
829 return 0;
830 }
831 memset(sb, 0, 1024);
832
833 st->sb = sb;
834 if (info == NULL) {
835 /* zeroing superblock */
836 return 0;
837 }
838
839 spares = info->working_disks - info->active_disks;
840 if (info->raid_disks + spares > 384) {
841 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
842 info->raid_disks , spares, 384);
843 return 0;
844 }
845
846 sb->magic = __cpu_to_le32(MD_SB_MAGIC);
847 sb->major_version = __cpu_to_le32(1);
848 sb->feature_map = 0;
849 sb->pad0 = 0;
850
851 if (uuid)
852 copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
853 else {
854 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
855 read(rfd, sb->set_uuid, 16) != 16) {
856 __u32 r[4] = {random(), random(), random(), random()};
857 memcpy(sb->set_uuid, r, 16);
858 }
859 if (rfd >= 0) close(rfd);
860 }
861
862 if (name == NULL || *name == 0) {
863 sprintf(defname, "%d", info->md_minor);
864 name = defname;
865 }
866 memset(sb->set_name, 0, 32);
867 if (homehost &&
868 strchr(name, ':')== NULL &&
869 strlen(homehost)+1+strlen(name) < 32) {
870 strcpy(sb->set_name, homehost);
871 strcat(sb->set_name, ":");
872 strcat(sb->set_name, name);
873 } else
874 strcpy(sb->set_name, name);
875
876 sb->ctime = __cpu_to_le64((unsigned long long)time(0));
877 sb->level = __cpu_to_le32(info->level);
878 sb->layout = __cpu_to_le32(info->layout);
879 sb->size = __cpu_to_le64(size*2ULL);
880 sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
881 sb->raid_disks = __cpu_to_le32(info->raid_disks);
882
883 sb->data_offset = __cpu_to_le64(0);
884 sb->data_size = __cpu_to_le64(0);
885 sb->super_offset = __cpu_to_le64(0);
886 sb->recovery_offset = __cpu_to_le64(0);
887
888 sb->utime = sb->ctime;
889 sb->events = __cpu_to_le64(1);
890 if (info->state & (1<<MD_SB_CLEAN))
891 sb->resync_offset = MaxSector;
892 else
893 sb->resync_offset = 0;
894 sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
895 sizeof(sb->dev_roles[0]));
896 memset(sb->pad3, 0, sizeof(sb->pad3));
897
898 memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
899
900 return 1;
901 }
902
903 struct devinfo {
904 int fd;
905 char *devname;
906 mdu_disk_info_t disk;
907 struct devinfo *next;
908 };
909 #ifndef MDASSEMBLE
910 /* Add a device to the superblock being created */
911 static int add_to_super1(struct supertype *st, mdu_disk_info_t *dk,
912 int fd, char *devname)
913 {
914 struct mdp_superblock_1 *sb = st->sb;
915 __u16 *rp = sb->dev_roles + dk->number;
916 struct devinfo *di, **dip;
917
918 if ((dk->state & 6) == 6) /* active, sync */
919 *rp = __cpu_to_le16(dk->raid_disk);
920 else if ((dk->state & ~2) == 0) /* active or idle -> spare */
921 *rp = 0xffff;
922 else
923 *rp = 0xfffe;
924
925 if (dk->number >= (int)__le32_to_cpu(sb->max_dev) &&
926 __le32_to_cpu(sb->max_dev) < 384)
927 sb->max_dev = __cpu_to_le32(dk->number+1);
928
929 sb->dev_number = __cpu_to_le32(dk->number);
930 sb->sb_csum = calc_sb_1_csum(sb);
931
932 dip = (struct devinfo **)&st->info;
933 while (*dip)
934 dip = &(*dip)->next;
935 di = malloc(sizeof(struct devinfo));
936 di->fd = fd;
937 di->devname = devname;
938 di->disk = *dk;
939 di->next = NULL;
940 *dip = di;
941
942 return 0;
943 }
944 #endif
945
946 static void locate_bitmap1(struct supertype *st, int fd);
947
948 static int store_super1(struct supertype *st, int fd)
949 {
950 struct mdp_superblock_1 *sb = st->sb;
951 unsigned long long sb_offset;
952 int sbsize;
953 unsigned long long dsize;
954
955 if (!get_dev_size(fd, NULL, &dsize))
956 return 1;
957
958 dsize >>= 9;
959
960 if (dsize < 24)
961 return 2;
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 */
971 switch(st->minor_version) {
972 case 0:
973 sb_offset = dsize;
974 sb_offset -= 8*2;
975 sb_offset &= ~(4*2-1);
976 break;
977 case 1:
978 sb_offset = 0;
979 break;
980 case 2:
981 sb_offset = 4*2;
982 break;
983 default:
984 return -EINVAL;
985 }
986
987
988
989 if (sb_offset != __le64_to_cpu(sb->super_offset) &&
990 0 != __le64_to_cpu(sb->super_offset)
991 ) {
992 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
993 abort();
994 }
995
996 if (lseek64(fd, sb_offset << 9, 0)< 0LL)
997 return 3;
998
999 sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
1000 sbsize = (sbsize+511)&(~511UL);
1001
1002 if (awrite(fd, sb, sbsize) != sbsize)
1003 return 4;
1004
1005 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
1006 struct bitmap_super_s *bm = (struct bitmap_super_s*)
1007 (((char*)sb)+1024);
1008 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
1009 locate_bitmap1(st, fd);
1010 if (awrite(fd, bm, sizeof(*bm)) !=
1011 sizeof(*bm))
1012 return 5;
1013 }
1014 }
1015 fsync(fd);
1016 return 0;
1017 }
1018
1019 static int load_super1(struct supertype *st, int fd, char *devname);
1020
1021 static unsigned long choose_bm_space(unsigned long devsize)
1022 {
1023 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
1024 * if bigger than 200Gig, save 128k
1025 * NOTE: result must be multiple of 4K else bad things happen
1026 * on 4K-sector devices.
1027 */
1028 if (devsize < 64*2) return 0;
1029 if (devsize - 64*2 >= 200*1024*1024*2)
1030 return 128*2;
1031 if (devsize - 4*2 > 8*1024*1024*2)
1032 return 64*2;
1033 return 4*2;
1034 }
1035
1036 static void free_super1(struct supertype *st);
1037
1038 #ifndef MDASSEMBLE
1039 static int write_init_super1(struct supertype *st)
1040 {
1041 struct mdp_superblock_1 *sb = st->sb;
1042 struct supertype *refst;
1043 int rfd;
1044 int rv = 0;
1045 unsigned long long bm_space;
1046 unsigned long long reserved;
1047 struct devinfo *di;
1048 unsigned long long dsize, array_size;
1049 unsigned long long sb_offset;
1050
1051 for (di = st->info; di && ! rv ; di = di->next) {
1052 if (di->disk.state == 1)
1053 continue;
1054 if (di->fd < 0)
1055 continue;
1056
1057 while (Kill(di->devname, NULL, 0, 1, 1) == 0)
1058 ;
1059
1060 sb->dev_number = __cpu_to_le32(di->disk.number);
1061 if (di->disk.state & (1<<MD_DISK_WRITEMOSTLY))
1062 sb->devflags |= __cpu_to_le32(WriteMostly1);
1063
1064 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
1065 read(rfd, sb->device_uuid, 16) != 16) {
1066 __u32 r[4] = {random(), random(), random(), random()};
1067 memcpy(sb->device_uuid, r, 16);
1068 }
1069 if (rfd >= 0)
1070 close(rfd);
1071
1072 sb->events = 0;
1073
1074 refst = dup_super(st);
1075 if (load_super1(refst, di->fd, NULL)==0) {
1076 struct mdp_superblock_1 *refsb = refst->sb;
1077
1078 memcpy(sb->device_uuid, refsb->device_uuid, 16);
1079 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
1080 /* same array, so preserve events and
1081 * dev_number */
1082 sb->events = refsb->events;
1083 /* bugs in 2.6.17 and earlier mean the
1084 * dev_number chosen in Manage must be preserved
1085 */
1086 if (get_linux_version() >= 2006018)
1087 sb->dev_number = refsb->dev_number;
1088 }
1089 free_super1(refst);
1090 }
1091 free(refst);
1092
1093 if (!get_dev_size(di->fd, NULL, &dsize))
1094 return 1;
1095 dsize >>= 9;
1096
1097 if (dsize < 24) {
1098 close(di->fd);
1099 return 2;
1100 }
1101
1102
1103 /*
1104 * Calculate the position of the superblock.
1105 * It is always aligned to a 4K boundary and
1106 * depending on minor_version, it can be:
1107 * 0: At least 8K, but less than 12K, from end of device
1108 * 1: At start of device
1109 * 2: 4K from start of device.
1110 * Depending on the array size, we might leave extra space
1111 * for a bitmap.
1112 */
1113 array_size = __le64_to_cpu(sb->size);
1114 /* work out how much space we left for a bitmap */
1115 bm_space = choose_bm_space(array_size);
1116
1117 switch(st->minor_version) {
1118 case 0:
1119 sb_offset = dsize;
1120 sb_offset -= 8*2;
1121 sb_offset &= ~(4*2-1);
1122 sb->super_offset = __cpu_to_le64(sb_offset);
1123 sb->data_offset = __cpu_to_le64(0);
1124 if (sb_offset < array_size + bm_space)
1125 bm_space = sb_offset - array_size;
1126 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
1127 break;
1128 case 1:
1129 sb->super_offset = __cpu_to_le64(0);
1130 reserved = bm_space + 4*2;
1131 /* Try for multiple of 1Meg so it is nicely aligned */
1132 #define ONE_MEG (2*1024)
1133 reserved = ((reserved + ONE_MEG-1)/ONE_MEG) * ONE_MEG;
1134 if (reserved + __le64_to_cpu(sb->size) > dsize)
1135 reserved = dsize - __le64_to_cpu(sb->size);
1136 /* force 4K alignment */
1137 reserved &= ~7ULL;
1138
1139 sb->data_offset = __cpu_to_le64(reserved);
1140 sb->data_size = __cpu_to_le64(dsize - reserved);
1141 break;
1142 case 2:
1143 sb_offset = 4*2;
1144 sb->super_offset = __cpu_to_le64(4*2);
1145 if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size)
1146 > dsize)
1147 bm_space = dsize - __le64_to_cpu(sb->size)
1148 - 4*2 - 4*2;
1149
1150 reserved = bm_space + 4*2 + 4*2;
1151 /* Try for multiple of 1Meg so it is nicely aligned */
1152 #define ONE_MEG (2*1024)
1153 reserved = ((reserved + ONE_MEG-1)/ONE_MEG) * ONE_MEG;
1154 if (reserved + __le64_to_cpu(sb->size) > dsize)
1155 reserved = dsize - __le64_to_cpu(sb->size);
1156 /* force 4K alignment */
1157 reserved &= ~7ULL;
1158
1159 sb->data_offset = __cpu_to_le64(reserved);
1160 sb->data_size = __cpu_to_le64(dsize - reserved);
1161 break;
1162 default:
1163 return -EINVAL;
1164 }
1165
1166
1167 sb->sb_csum = calc_sb_1_csum(sb);
1168 rv = store_super1(st, di->fd);
1169 if (rv)
1170 fprintf(stderr,
1171 Name ": failed to write superblock to %s\n",
1172 di->devname);
1173
1174 if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
1175 rv = st->ss->write_bitmap(st, di->fd);
1176 close(di->fd);
1177 di->fd = -1;
1178 }
1179 return rv;
1180 }
1181 #endif
1182
1183 static int compare_super1(struct supertype *st, struct supertype *tst)
1184 {
1185 /*
1186 * return:
1187 * 0 same, or first was empty, and second was copied
1188 * 1 second had wrong number
1189 * 2 wrong uuid
1190 * 3 wrong other info
1191 */
1192 struct mdp_superblock_1 *first = st->sb;
1193 struct mdp_superblock_1 *second = tst->sb;
1194
1195 if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
1196 return 1;
1197 if (second->major_version != __cpu_to_le32(1))
1198 return 1;
1199
1200 if (!first) {
1201 if (posix_memalign((void**)&first, 512,
1202 1024 + 512 +
1203 sizeof(struct misc_dev_info)) != 0) {
1204 fprintf(stderr, Name
1205 ": %s could not allocate superblock\n", __func__);
1206 return 1;
1207 }
1208 memcpy(first, second, 1024 + 512 +
1209 sizeof(struct misc_dev_info));
1210 st->sb = first;
1211 return 0;
1212 }
1213 if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
1214 return 2;
1215
1216 if (first->ctime != second->ctime ||
1217 first->level != second->level ||
1218 first->layout != second->layout ||
1219 first->size != second->size ||
1220 first->chunksize != second->chunksize ||
1221 first->raid_disks != second->raid_disks)
1222 return 3;
1223 return 0;
1224 }
1225
1226 static int load_super1(struct supertype *st, int fd, char *devname)
1227 {
1228 unsigned long long dsize;
1229 unsigned long long sb_offset;
1230 struct mdp_superblock_1 *super;
1231 int uuid[4];
1232 struct bitmap_super_s *bsb;
1233 struct misc_dev_info *misc;
1234
1235 free_super1(st);
1236
1237 if (st->ss == NULL || st->minor_version == -1) {
1238 int bestvers = -1;
1239 struct supertype tst;
1240 __u64 bestctime = 0;
1241 /* guess... choose latest ctime */
1242 memset(&tst, 0, sizeof(tst));
1243 tst.ss = &super1;
1244 for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
1245 switch(load_super1(&tst, fd, devname)) {
1246 case 0: super = tst.sb;
1247 if (bestvers == -1 ||
1248 bestctime < __le64_to_cpu(super->ctime)) {
1249 bestvers = tst.minor_version;
1250 bestctime = __le64_to_cpu(super->ctime);
1251 }
1252 free(super);
1253 tst.sb = NULL;
1254 break;
1255 case 1: return 1; /*bad device */
1256 case 2: break; /* bad, try next */
1257 }
1258 }
1259 if (bestvers != -1) {
1260 int rv;
1261 tst.minor_version = bestvers;
1262 tst.ss = &super1;
1263 tst.max_devs = 384;
1264 rv = load_super1(&tst, fd, devname);
1265 if (rv == 0)
1266 *st = tst;
1267 return rv;
1268 }
1269 return 2;
1270 }
1271 if (!get_dev_size(fd, devname, &dsize))
1272 return 1;
1273 dsize >>= 9;
1274
1275 if (dsize < 24) {
1276 if (devname)
1277 fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
1278 devname, dsize);
1279 return 1;
1280 }
1281
1282 /*
1283 * Calculate the position of the superblock.
1284 * It is always aligned to a 4K boundary and
1285 * depending on minor_version, it can be:
1286 * 0: At least 8K, but less than 12K, from end of device
1287 * 1: At start of device
1288 * 2: 4K from start of device.
1289 */
1290 switch(st->minor_version) {
1291 case 0:
1292 sb_offset = dsize;
1293 sb_offset -= 8*2;
1294 sb_offset &= ~(4*2-1);
1295 break;
1296 case 1:
1297 sb_offset = 0;
1298 break;
1299 case 2:
1300 sb_offset = 4*2;
1301 break;
1302 default:
1303 return -EINVAL;
1304 }
1305
1306 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1307
1308
1309 if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1310 if (devname)
1311 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1312 devname, strerror(errno));
1313 return 1;
1314 }
1315
1316 if (posix_memalign((void**)&super, 512,
1317 1024 + 512 +
1318 sizeof(struct misc_dev_info)) != 0) {
1319 fprintf(stderr, Name ": %s could not allocate superblock\n",
1320 __func__);
1321 return 1;
1322 }
1323
1324 if (aread(fd, super, 1024) != 1024) {
1325 if (devname)
1326 fprintf(stderr, Name ": Cannot read superblock on %s\n",
1327 devname);
1328 free(super);
1329 return 1;
1330 }
1331
1332 if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1333 if (devname)
1334 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1335 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1336 free(super);
1337 return 2;
1338 }
1339
1340 if (__le32_to_cpu(super->major_version) != 1) {
1341 if (devname)
1342 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1343 devname, __le32_to_cpu(super->major_version));
1344 free(super);
1345 return 2;
1346 }
1347 if (__le64_to_cpu(super->super_offset) != sb_offset) {
1348 if (devname)
1349 fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1350 devname);
1351 free(super);
1352 return 2;
1353 }
1354 st->sb = super;
1355
1356 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1357
1358 misc = (struct misc_dev_info*) (((char*)super)+1024+512);
1359 misc->device_size = dsize;
1360
1361 /* Now check on the bitmap superblock */
1362 if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1363 return 0;
1364 /* Read the bitmap superblock and make sure it looks
1365 * valid. If it doesn't clear the bit. An --assemble --force
1366 * should get that written out.
1367 */
1368 locate_bitmap1(st, fd);
1369 if (aread(fd, ((char*)super)+1024, 512)
1370 != 512)
1371 goto no_bitmap;
1372
1373 uuid_from_super1(st, uuid);
1374 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1375 memcmp(bsb->uuid, uuid, 16) != 0)
1376 goto no_bitmap;
1377 return 0;
1378
1379 no_bitmap:
1380 super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1381 return 0;
1382 }
1383
1384
1385 static struct supertype *match_metadata_desc1(char *arg)
1386 {
1387 struct supertype *st = malloc(sizeof(*st));
1388 if (!st) return st;
1389
1390 memset(st, 0, sizeof(*st));
1391 st->container_dev = NoMdDev;
1392 st->ss = &super1;
1393 st->max_devs = 384;
1394 st->sb = NULL;
1395 /* leading zeros can be safely ignored. --detail generates them. */
1396 while (*arg == '0')
1397 arg++;
1398 if (strcmp(arg, "1.0") == 0 ||
1399 strcmp(arg, "1.00") == 0) {
1400 st->minor_version = 0;
1401 return st;
1402 }
1403 if (strcmp(arg, "1.1") == 0 ||
1404 strcmp(arg, "1.01") == 0
1405 ) {
1406 st->minor_version = 1;
1407 return st;
1408 }
1409 if (strcmp(arg, "1.2") == 0 ||
1410 #ifndef DEFAULT_OLD_METADATA /* ifdef in super0.c */
1411 strcmp(arg, "default") == 0 ||
1412 #endif /* DEFAULT_OLD_METADATA */
1413 strcmp(arg, "1.02") == 0) {
1414 st->minor_version = 2;
1415 return st;
1416 }
1417 if (strcmp(arg, "1") == 0 ||
1418 strcmp(arg, "default") == 0) {
1419 st->minor_version = -1;
1420 return st;
1421 }
1422
1423 free(st);
1424 return NULL;
1425 }
1426
1427 /* find available size on device with this devsize, using
1428 * superblock type st, and reserving 'reserve' sectors for
1429 * a possible bitmap
1430 */
1431 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1432 {
1433 struct mdp_superblock_1 *super = st->sb;
1434 if (devsize < 24)
1435 return 0;
1436
1437 if (super == NULL)
1438 /* creating: allow suitable space for bitmap */
1439 devsize -= choose_bm_space(devsize);
1440 #ifndef MDASSEMBLE
1441 else if (__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
1442 /* hot-add. allow for actual size of bitmap */
1443 struct bitmap_super_s *bsb;
1444 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1445 devsize -= bitmap_sectors(bsb);
1446 }
1447 #endif
1448
1449 if (st->minor_version < 0)
1450 /* not specified, so time to set default */
1451 st->minor_version = 2;
1452 if (super == NULL && st->minor_version > 0) {
1453 /* haven't committed to a size yet, so allow some
1454 * slack for alignment of data_offset.
1455 * We haven't access to device details so allow
1456 * 1 Meg if bigger than 1Gig
1457 */
1458 if (devsize > 1024*1024*2)
1459 devsize -= 1024*2;
1460 }
1461 switch(st->minor_version) {
1462 case 0:
1463 /* at end */
1464 return ((devsize - 8*2 ) & ~(4*2-1));
1465 case 1:
1466 /* at start, 4K for superblock and possible bitmap */
1467 return devsize - 4*2;
1468 case 2:
1469 /* 4k from start, 4K for superblock and possible bitmap */
1470 return devsize - (4+4)*2;
1471 }
1472 return 0;
1473 }
1474
1475 static int
1476 add_internal_bitmap1(struct supertype *st,
1477 int *chunkp, int delay, int write_behind,
1478 unsigned long long size,
1479 int may_change, int major)
1480 {
1481 /*
1482 * If not may_change, then this is a 'Grow', and the bitmap
1483 * must fit after the superblock.
1484 * If may_change, then this is create, and we can put the bitmap
1485 * before the superblock if we like, or may move the start.
1486 * If !may_change, the bitmap MUST live at offset of 1K, until
1487 * we get a sysfs interface.
1488 *
1489 * size is in sectors, chunk is in bytes !!!
1490 */
1491
1492 unsigned long long bits;
1493 unsigned long long max_bits;
1494 unsigned long long min_chunk;
1495 long offset;
1496 unsigned long long chunk = *chunkp;
1497 int room = 0;
1498 struct mdp_superblock_1 *sb = st->sb;
1499 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1500
1501 switch(st->minor_version) {
1502 case 0:
1503 /* either 3K after the superblock (when hot-add),
1504 * or some amount of space before.
1505 */
1506 if (may_change) {
1507 /* We are creating array, so we *know* how much room has
1508 * been left.
1509 */
1510 offset = 0;
1511 room = choose_bm_space(__le64_to_cpu(sb->size));
1512 } else {
1513 room = __le64_to_cpu(sb->super_offset)
1514 - __le64_to_cpu(sb->data_offset)
1515 - __le64_to_cpu(sb->data_size);
1516 /* remove '1 ||' when we can set offset via sysfs */
1517 if (1 || (room < 3*2 &&
1518 __le32_to_cpu(sb->max_dev) <= 384)) {
1519 room = 3*2;
1520 offset = 1*2;
1521 } else {
1522 offset = 0; /* means movable offset */
1523 }
1524 }
1525 break;
1526 case 1:
1527 case 2: /* between superblock and data */
1528 if (may_change) {
1529 offset = 4*2;
1530 room = choose_bm_space(__le64_to_cpu(sb->size));
1531 } else {
1532 room = __le64_to_cpu(sb->data_offset)
1533 - __le64_to_cpu(sb->super_offset);
1534 if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1535 room -= 2;
1536 offset = 2;
1537 } else {
1538 room -= 4*2;
1539 offset = 4*2;
1540 }
1541 }
1542 break;
1543 default:
1544 return 0;
1545 }
1546
1547 if (chunk == UnSet && room > 128*2)
1548 /* Limit to 128K of bitmap when chunk size not requested */
1549 room = 128*2;
1550
1551 max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1552
1553 min_chunk = 4096; /* sub-page chunks don't work yet.. */
1554 bits = (size*512)/min_chunk +1;
1555 while (bits > max_bits) {
1556 min_chunk *= 2;
1557 bits = (bits+1)/2;
1558 }
1559 if (chunk == UnSet) {
1560 /* For practical purpose, 64Meg is a good
1561 * default chunk size for internal bitmaps.
1562 */
1563 chunk = min_chunk;
1564 if (chunk < 64*1024*1024)
1565 chunk = 64*1024*1024;
1566 } else if (chunk < min_chunk)
1567 return 0; /* chunk size too small */
1568 if (chunk == 0) /* rounding problem */
1569 return 0;
1570
1571 if (offset == 0) {
1572 /* start bitmap on a 4K boundary with enough space for
1573 * the bitmap
1574 */
1575 bits = (size*512) / chunk + 1;
1576 room = ((bits+7)/8 + sizeof(bitmap_super_t) +4095)/4096;
1577 room *= 8; /* convert 4K blocks to sectors */
1578 offset = -room;
1579 }
1580
1581 sb->bitmap_offset = __cpu_to_le32(offset);
1582
1583 sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1584 memset(bms, 0, sizeof(*bms));
1585 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1586 bms->version = __cpu_to_le32(major);
1587 uuid_from_super1(st, (int*)bms->uuid);
1588 bms->chunksize = __cpu_to_le32(chunk);
1589 bms->daemon_sleep = __cpu_to_le32(delay);
1590 bms->sync_size = __cpu_to_le64(size);
1591 bms->write_behind = __cpu_to_le32(write_behind);
1592
1593 *chunkp = chunk;
1594 return 1;
1595 }
1596
1597
1598 static void locate_bitmap1(struct supertype *st, int fd)
1599 {
1600 unsigned long long offset;
1601 struct mdp_superblock_1 *sb;
1602 int mustfree = 0;
1603
1604 if (!st->sb) {
1605 if (st->ss->load_super(st, fd, NULL))
1606 return; /* no error I hope... */
1607 mustfree = 1;
1608 }
1609 sb = st->sb;
1610
1611 offset = __le64_to_cpu(sb->super_offset);
1612 offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
1613 if (mustfree)
1614 free(sb);
1615 lseek64(fd, offset<<9, 0);
1616 }
1617
1618 static int write_bitmap1(struct supertype *st, int fd)
1619 {
1620 struct mdp_superblock_1 *sb = st->sb;
1621 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1622 int rv = 0;
1623
1624 int towrite, n;
1625 char *buf = (char*)(((long)(abuf+4096))&~4095UL);
1626
1627 locate_bitmap1(st, fd);
1628
1629 memset(buf, 0xff, 4096);
1630 memcpy(buf, ((char*)sb)+1024, sizeof(bitmap_super_t));
1631
1632 towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1633 towrite = (towrite+7) >> 3; /* bits to bytes */
1634 towrite += sizeof(bitmap_super_t);
1635 towrite = ROUND_UP(towrite, 512);
1636 while (towrite > 0) {
1637 n = towrite;
1638 if (n > 4096)
1639 n = 4096;
1640 n = write(fd, buf, n);
1641 if (n > 0)
1642 towrite -= n;
1643 else
1644 break;
1645 memset(buf, 0xff, 4096);
1646 }
1647 fsync(fd);
1648 if (towrite)
1649 rv = -2;
1650
1651 return rv;
1652 }
1653
1654 static void free_super1(struct supertype *st)
1655 {
1656 if (st->sb)
1657 free(st->sb);
1658 while (st->info) {
1659 struct devinfo *di = st->info;
1660 st->info = di->next;
1661 if (di->fd >= 0)
1662 close(di->fd);
1663 free(di);
1664 }
1665 st->sb = NULL;
1666 }
1667
1668 #ifndef MDASSEMBLE
1669 static int validate_geometry1(struct supertype *st, int level,
1670 int layout, int raiddisks,
1671 int *chunk, unsigned long long size,
1672 char *subdev, unsigned long long *freesize,
1673 int verbose)
1674 {
1675 unsigned long long ldsize;
1676 int fd;
1677
1678 if (level == LEVEL_CONTAINER) {
1679 if (verbose)
1680 fprintf(stderr, Name ": 1.x metadata does not support containers\n");
1681 return 0;
1682 }
1683 if (chunk && *chunk == UnSet)
1684 *chunk = DEFAULT_CHUNK;
1685
1686 if (!subdev)
1687 return 1;
1688
1689 fd = open(subdev, O_RDONLY|O_EXCL, 0);
1690 if (fd < 0) {
1691 if (verbose)
1692 fprintf(stderr, Name ": super1.x cannot open %s: %s\n",
1693 subdev, strerror(errno));
1694 return 0;
1695 }
1696
1697 if (!get_dev_size(fd, subdev, &ldsize)) {
1698 close(fd);
1699 return 0;
1700 }
1701 close(fd);
1702
1703 *freesize = avail_size1(st, ldsize >> 9);
1704 return 1;
1705 }
1706 #endif /* MDASSEMBLE */
1707
1708 struct superswitch super1 = {
1709 #ifndef MDASSEMBLE
1710 .examine_super = examine_super1,
1711 .brief_examine_super = brief_examine_super1,
1712 .export_examine_super = export_examine_super1,
1713 .detail_super = detail_super1,
1714 .brief_detail_super = brief_detail_super1,
1715 .export_detail_super = export_detail_super1,
1716 .write_init_super = write_init_super1,
1717 .validate_geometry = validate_geometry1,
1718 .add_to_super = add_to_super1,
1719 #endif
1720 .match_home = match_home1,
1721 .uuid_from_super = uuid_from_super1,
1722 .getinfo_super = getinfo_super1,
1723 .container_content = container_content1,
1724 .update_super = update_super1,
1725 .init_super = init_super1,
1726 .store_super = store_super1,
1727 .compare_super = compare_super1,
1728 .load_super = load_super1,
1729 .match_metadata_desc = match_metadata_desc1,
1730 .avail_size = avail_size1,
1731 .add_internal_bitmap = add_internal_bitmap1,
1732 .locate_bitmap = locate_bitmap1,
1733 .write_bitmap = write_bitmap1,
1734 .free_super = free_super1,
1735 #if __BYTE_ORDER == BIG_ENDIAN
1736 .swapuuid = 0,
1737 #else
1738 .swapuuid = 1,
1739 #endif
1740 .name = "1.x",
1741 };
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