]> git.ipfire.org Git - thirdparty/mdadm.git/blob - super1.c
projects / thirdparty / mdadm.git / blob
? search:


35ef771a613c9b29db436737ae621a9ada692822
[thirdparty/mdadm.git] / super1.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29
30 #include "mdadm.h"
31 /*
32 * The version-1 superblock :
33 * All numeric fields are little-endian.
34 *
35 * total size: 256 bytes plus 2 per device.
36 * 1K allows 384 devices.
37 */
38 struct mdp_superblock_1 {
39 /* constant array information - 128 bytes */
40 __u32 magic; /* MD_SB_MAGIC: 0xa92b4efc - little endian */
41 __u32 major_version; /* 1 */
42 __u32 feature_map; /* 0 for now */
43 __u32 pad0; /* always set to 0 when writing */
44
45 __u8 set_uuid[16]; /* user-space generated. */
46 char set_name[32]; /* set and interpreted by user-space */
47
48 __u64 ctime; /* lo 40 bits are seconds, top 24 are microseconds or 0*/
49 __u32 level; /* -4 (multipath), -1 (linear), 0,1,4,5 */
50 __u32 layout; /* only for raid5 currently */
51 __u64 size; /* used size of component devices, in 512byte sectors */
52
53 __u32 chunksize; /* in 512byte sectors */
54 __u32 raid_disks;
55 __u32 bitmap_offset; /* sectors after start of superblock that bitmap starts
56 * NOTE: signed, so bitmap can be before superblock
57 * only meaningful of feature_map[0] is set.
58 */
59
60 /* These are only valid with feature bit '4' */
61 __u32 new_level; /* new level we are reshaping to */
62 __u64 reshape_position; /* next address in array-space for reshape */
63 __u32 delta_disks; /* change in number of raid_disks */
64 __u32 new_layout; /* new layout */
65 __u32 new_chunk; /* new chunk size (bytes) */
66 __u8 pad1[128-124]; /* set to 0 when written */
67
68 /* constant this-device information - 64 bytes */
69 __u64 data_offset; /* sector start of data, often 0 */
70 __u64 data_size; /* sectors in this device that can be used for data */
71 __u64 super_offset; /* sector start of this superblock */
72 __u64 recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
73 __u32 dev_number; /* permanent identifier of this device - not role in raid */
74 __u32 cnt_corrected_read; /* number of read errors that were corrected by re-writing */
75 __u8 device_uuid[16]; /* user-space setable, ignored by kernel */
76 __u8 devflags; /* per-device flags. Only one defined...*/
77 #define WriteMostly1 1 /* mask for writemostly flag in above */
78 __u8 pad2[64-57]; /* set to 0 when writing */
79
80 /* array state information - 64 bytes */
81 __u64 utime; /* 40 bits second, 24 btes microseconds */
82 __u64 events; /* incremented when superblock updated */
83 __u64 resync_offset; /* data before this offset (from data_offset) known to be in sync */
84 __u32 sb_csum; /* checksum upto devs[max_dev] */
85 __u32 max_dev; /* size of devs[] array to consider */
86 __u8 pad3[64-32]; /* set to 0 when writing */
87
88 /* device state information. Indexed by dev_number.
89 * 2 bytes per device
90 * Note there are no per-device state flags. State information is rolled
91 * into the 'roles' value. If a device is spare or faulty, then it doesn't
92 * have a meaningful role.
93 */
94 __u16 dev_roles[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
95 };
96
97 struct misc_dev_info {
98 __u64 device_size;
99 };
100
101 /* feature_map bits */
102 #define MD_FEATURE_BITMAP_OFFSET 1
103 #define MD_FEATURE_RECOVERY_OFFSET 2 /* recovery_offset is present and
104 * must be honoured
105 */
106 #define MD_FEATURE_RESHAPE_ACTIVE 4
107
108 #define MD_FEATURE_ALL (1|2|4)
109
110 #ifndef offsetof
111 #define offsetof(t,f) ((size_t)&(((t*)0)->f))
112 #endif
113 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
114 {
115 unsigned int disk_csum, csum;
116 unsigned long long newcsum;
117 int size = sizeof(*sb) + __le32_to_cpu(sb->max_dev)*2;
118 unsigned int *isuper = (unsigned int*)sb;
119 int i;
120
121 /* make sure I can count... */
122 if (offsetof(struct mdp_superblock_1,data_offset) != 128 ||
123 offsetof(struct mdp_superblock_1, utime) != 192 ||
124 sizeof(struct mdp_superblock_1) != 256) {
125 fprintf(stderr, "WARNING - superblock isn't sized correctly\n");
126 }
127
128 disk_csum = sb->sb_csum;
129 sb->sb_csum = 0;
130 newcsum = 0;
131 for (i=0; size>=4; size -= 4 ) {
132 newcsum += __le32_to_cpu(*isuper);
133 isuper++;
134 }
135
136 if (size == 2)
137 newcsum += __le16_to_cpu(*(unsigned short*) isuper);
138
139 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
140 sb->sb_csum = disk_csum;
141 return __cpu_to_le32(csum);
142 }
143
144 static char abuf[4096+4096];
145 static int aread(int fd, void *buf, int len)
146 {
147 /* aligned read.
148 * On devices with a 4K sector size, we need to read
149 * the full sector and copy relevant bits into
150 * the buffer
151 */
152 int bsize;
153 char *b;
154 int n;
155 if (ioctl(fd, BLKSSZGET, &bsize) != 0 ||
156 bsize <= len)
157 return read(fd, buf, len);
158 if (bsize > 4096)
159 return -1;
160 b = (char*)(((long)(abuf+4096))&~4095UL);
161
162 n = read(fd, b, bsize);
163 if (n <= 0)
164 return n;
165 lseek(fd, len - n, 1);
166 if (n > len)
167 n = len;
168 memcpy(buf, b, n);
169 return n;
170 }
171
172 static int awrite(int fd, void *buf, int len)
173 {
174 /* aligned write.
175 * On devices with a 4K sector size, we need to write
176 * the full sector. We pre-read if the sector is larger
177 * than the write.
178 * The address must be sector-aligned.
179 */
180 int bsize;
181 char *b;
182 int n;
183 if (ioctl(fd, BLKSSZGET, &bsize) != 0 ||
184 bsize <= len)
185 return write(fd, buf, len);
186 if (bsize > 4096)
187 return -1;
188 b = (char*)(((long)(abuf+4096))&~4095UL);
189
190 n = read(fd, b, bsize);
191 if (n <= 0)
192 return n;
193 lseek(fd, -n, 1);
194 memcpy(b, buf, len);
195 n = write(fd, b, bsize);
196 if (n <= 0)
197 return n;
198 lseek(fd, len - n, 1);
199 return len;
200 }
201
202 #ifndef MDASSEMBLE
203 static void examine_super1(struct supertype *st, char *homehost)
204 {
205 struct mdp_superblock_1 *sb = st->sb;
206 time_t atime;
207 int d;
208 int role;
209 int i;
210 char *c;
211 int l = homehost ? strlen(homehost) : 0;
212 int layout;
213 unsigned long long sb_offset;
214
215 printf(" Magic : %08x\n", __le32_to_cpu(sb->magic));
216 printf(" Version : 1");
217 sb_offset = __le64_to_cpu(sb->super_offset);
218 if (sb_offset <= 4)
219 printf(".1\n");
220 else if (sb_offset <= 8)
221 printf(".2\n");
222 else
223 printf(".0\n");
224 printf(" Feature Map : 0x%x\n", __le32_to_cpu(sb->feature_map));
225 printf(" Array UUID : ");
226 for (i=0; i<16; i++) {
227 if ((i&3)==0 && i != 0) printf(":");
228 printf("%02x", sb->set_uuid[i]);
229 }
230 printf("\n");
231 printf(" Name : %.32s", sb->set_name);
232 if (l > 0 && l < 32 &&
233 sb->set_name[l] == ':' &&
234 strncmp(sb->set_name, homehost, l) == 0)
235 printf(" (local to host %s)", homehost);
236 printf("\n");
237 atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL;
238 printf(" Creation Time : %.24s\n", ctime(&atime));
239 c=map_num(pers, __le32_to_cpu(sb->level));
240 printf(" Raid Level : %s\n", c?c:"-unknown-");
241 printf(" Raid Devices : %d\n", __le32_to_cpu(sb->raid_disks));
242 printf("\n");
243 printf(" Avail Dev Size : %llu%s\n",
244 (unsigned long long)__le64_to_cpu(sb->data_size),
245 human_size(__le64_to_cpu(sb->data_size)<<9));
246 if (__le32_to_cpu(sb->level) >= 0) {
247 int ddsks=0;
248 switch(__le32_to_cpu(sb->level)) {
249 case 1: ddsks=1;break;
250 case 4:
251 case 5: ddsks = __le32_to_cpu(sb->raid_disks)-1; break;
252 case 6: ddsks = __le32_to_cpu(sb->raid_disks)-2; break;
253 case 10:
254 layout = __le32_to_cpu(sb->layout);
255 ddsks = __le32_to_cpu(sb->raid_disks)
256 / (layout&255) / ((layout>>8)&255);
257 }
258 if (ddsks)
259 printf(" Array Size : %llu%s\n",
260 ddsks*(unsigned long long)__le64_to_cpu(sb->size),
261 human_size(ddsks*__le64_to_cpu(sb->size)<<9));
262 if (sb->size != sb->data_size)
263 printf(" Used Dev Size : %llu%s\n",
264 (unsigned long long)__le64_to_cpu(sb->size),
265 human_size(__le64_to_cpu(sb->size)<<9));
266 }
267 if (sb->data_offset)
268 printf(" Data Offset : %llu sectors\n",
269 (unsigned long long)__le64_to_cpu(sb->data_offset));
270 printf(" Super Offset : %llu sectors\n",
271 (unsigned long long)__le64_to_cpu(sb->super_offset));
272 if (__le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)
273 printf("Recovery Offset : %llu sectors\n", (unsigned long long)__le64_to_cpu(sb->recovery_offset));
274 printf(" State : %s\n", (__le64_to_cpu(sb->resync_offset)+1)? "active":"clean");
275 printf(" Device UUID : ");
276 for (i=0; i<16; i++) {
277 if ((i&3)==0 && i != 0) printf(":");
278 printf("%02x", sb->device_uuid[i]);
279 }
280 printf("\n");
281 printf("\n");
282 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
283 printf("Internal Bitmap : %ld sectors from superblock\n",
284 (long)(int32_t)__le32_to_cpu(sb->bitmap_offset));
285 }
286 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
287 printf(" Reshape pos'n : %llu%s\n", (unsigned long long)__le64_to_cpu(sb->reshape_position)/2,
288 human_size(__le64_to_cpu(sb->reshape_position)<<9));
289 if (__le32_to_cpu(sb->delta_disks)) {
290 printf(" Delta Devices : %d", __le32_to_cpu(sb->delta_disks));
291 if (__le32_to_cpu(sb->delta_disks))
292 printf(" (%d->%d)\n",
293 __le32_to_cpu(sb->raid_disks)-__le32_to_cpu(sb->delta_disks),
294 __le32_to_cpu(sb->raid_disks));
295 else
296 printf(" (%d->%d)\n", __le32_to_cpu(sb->raid_disks),
297 __le32_to_cpu(sb->raid_disks)+__le32_to_cpu(sb->delta_disks));
298 }
299 if (__le32_to_cpu(sb->new_level) != __le32_to_cpu(sb->level)) {
300 c = map_num(pers, __le32_to_cpu(sb->new_level));
301 printf(" New Level : %s\n", c?c:"-unknown-");
302 }
303 if (__le32_to_cpu(sb->new_layout) != __le32_to_cpu(sb->layout)) {
304 if (__le32_to_cpu(sb->level) == 5) {
305 c = map_num(r5layout, __le32_to_cpu(sb->new_layout));
306 printf(" New Layout : %s\n", c?c:"-unknown-");
307 }
308 if (__le32_to_cpu(sb->level) == 10) {
309 printf(" New Layout :");
310 print_r10_layout(__le32_to_cpu(sb->new_layout));
311 printf("\n");
312 }
313 }
314 if (__le32_to_cpu(sb->new_chunk) != __le32_to_cpu(sb->chunksize))
315 printf(" New Chunksize : %dK\n", __le32_to_cpu(sb->new_chunk)/2);
316 printf("\n");
317 }
318 if (sb->devflags) {
319 printf(" Flags :");
320 if (sb->devflags & WriteMostly1)
321 printf(" write-mostly");
322 printf("\n");
323 }
324
325 atime = __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL;
326 printf(" Update Time : %.24s\n", ctime(&atime));
327
328 if (calc_sb_1_csum(sb) == sb->sb_csum)
329 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb->sb_csum));
330 else
331 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb->sb_csum),
332 __le32_to_cpu(calc_sb_1_csum(sb)));
333 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb->events));
334 printf("\n");
335 if (__le32_to_cpu(sb->level) == 5) {
336 c = map_num(r5layout, __le32_to_cpu(sb->layout));
337 printf(" Layout : %s\n", c?c:"-unknown-");
338 }
339 if (__le32_to_cpu(sb->level) == 10) {
340 int lo = __le32_to_cpu(sb->layout);
341 printf(" Layout :");
342 print_r10_layout(lo);
343 printf("\n");
344 }
345 switch(__le32_to_cpu(sb->level)) {
346 case 0:
347 case 4:
348 case 5:
349 case 6:
350 case 10:
351 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb->chunksize)/2);
352 break;
353 case -1:
354 printf(" Rounding : %dK\n", __le32_to_cpu(sb->chunksize)/2);
355 break;
356 default: break;
357 }
358 printf("\n");
359 #if 0
360 /* This turns out to just be confusing */
361 printf(" Array Slot : %d (", __le32_to_cpu(sb->dev_number));
362 for (i= __le32_to_cpu(sb->max_dev); i> 0 ; i--)
363 if (__le16_to_cpu(sb->dev_roles[i-1]) != 0xffff)
364 break;
365 for (d=0; d < i; d++) {
366 int role = __le16_to_cpu(sb->dev_roles[d]);
367 if (d) printf(", ");
368 if (role == 0xffff) printf("empty");
369 else if(role == 0xfffe) printf("failed");
370 else printf("%d", role);
371 }
372 printf(")\n");
373 #endif
374 printf(" Device Role : ");
375 d = __le32_to_cpu(sb->dev_number);
376 if (d < sb->raid_disks)
377 role = __le16_to_cpu(sb->dev_roles[d]);
378 else
379 role = 0xFFFF;
380 if (role >= 0xFFFE)
381 printf("spare\n");
382 else
383 printf("Active device %d\n", role);
384
385 printf(" Array State : ");
386 for (d=0; d<__le32_to_cpu(sb->raid_disks); d++) {
387 int cnt = 0;
388 int me = 0;
389 int i;
390 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
391 int role = __le16_to_cpu(sb->dev_roles[i]);
392 if (role == d) {
393 if (i == __le32_to_cpu(sb->dev_number))
394 me = 1;
395 cnt++;
396 }
397 }
398 if (cnt > 1) printf("?");
399 else if (cnt == 1) printf("A");
400 else printf (".");
401 }
402 #if 0
403 /* This is confusing too */
404 faulty = 0;
405 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
406 int role = __le16_to_cpu(sb->dev_roles[i]);
407 if (role == 0xFFFE)
408 faulty++;
409 }
410 if (faulty) printf(" %d failed", faulty);
411 #endif
412 printf(" ('A' == active, '.' == missing)");
413 printf("\n");
414 }
415
416
417 static void brief_examine_super1(struct supertype *st, int verbose)
418 {
419 struct mdp_superblock_1 *sb = st->sb;
420 int i;
421 unsigned long long sb_offset;
422 char *nm;
423 char *c=map_num(pers, __le32_to_cpu(sb->level));
424
425 nm = strchr(sb->set_name, ':');
426 if (nm)
427 nm++;
428 else if (sb->set_name[0])
429 nm = sb->set_name;
430 else
431 nm = NULL;
432
433 printf("ARRAY%s%s", nm ? " /dev/md/":"", nm);
434 if (verbose && c)
435 printf(" level=%s", c);
436 sb_offset = __le64_to_cpu(sb->super_offset);
437 if (sb_offset <= 4)
438 printf(" metadata=1.1 ");
439 else if (sb_offset <= 8)
440 printf(" metadata=1.2 ");
441 else
442 printf(" metadata=1.0 ");
443 if (verbose)
444 printf("num-devices=%d ", __le32_to_cpu(sb->raid_disks));
445 printf("UUID=");
446 for (i=0; i<16; i++) {
447 if ((i&3)==0 && i != 0) printf(":");
448 printf("%02x", sb->set_uuid[i]);
449 }
450 if (sb->set_name[0])
451 printf(" name=%.32s", sb->set_name);
452 printf("\n");
453 }
454
455 static void export_examine_super1(struct supertype *st)
456 {
457 struct mdp_superblock_1 *sb = st->sb;
458 int i;
459 int len = 32;
460
461 printf("MD_LEVEL=%s\n", map_num(pers, __le32_to_cpu(sb->level)));
462 printf("MD_DEVICES=%d\n", __le32_to_cpu(sb->raid_disks));
463 for (i=0; i<32; i++)
464 if (sb->set_name[i] == '\n' ||
465 sb->set_name[i] == '\0') {
466 len = i;
467 break;
468 }
469 if (len)
470 printf("MD_NAME=%.*s\n", len, sb->set_name);
471 printf("MD_UUID=");
472 for (i=0; i<16; i++) {
473 if ((i&3)==0 && i != 0) printf(":");
474 printf("%02x", sb->set_uuid[i]);
475 }
476 printf("\n");
477 printf("MD_UPDATE_TIME=%llu\n",
478 __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL);
479 printf("MD_DEV_UUID=");
480 for (i=0; i<16; i++) {
481 if ((i&3)==0 && i != 0) printf(":");
482 printf("%02x", sb->device_uuid[i]);
483 }
484 printf("\n");
485 printf("MD_EVENTS=%llu\n",
486 (unsigned long long)__le64_to_cpu(sb->events));
487 }
488
489 static void detail_super1(struct supertype *st, char *homehost)
490 {
491 struct mdp_superblock_1 *sb = st->sb;
492 int i;
493 int l = homehost ? strlen(homehost) : 0;
494
495 printf(" Name : %.32s", sb->set_name);
496 if (l > 0 && l < 32 &&
497 sb->set_name[l] == ':' &&
498 strncmp(sb->set_name, homehost, l) == 0)
499 printf(" (local to host %s)", homehost);
500 printf("\n UUID : ");
501 for (i=0; i<16; i++) {
502 if ((i&3)==0 && i != 0) printf(":");
503 printf("%02x", sb->set_uuid[i]);
504 }
505 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb->events));
506 }
507
508 static void brief_detail_super1(struct supertype *st)
509 {
510 struct mdp_superblock_1 *sb = st->sb;
511 int i;
512
513 if (sb->set_name[0])
514 printf(" name=%.32s", sb->set_name);
515 printf(" UUID=");
516 for (i=0; i<16; i++) {
517 if ((i&3)==0 && i != 0) printf(":");
518 printf("%02x", sb->set_uuid[i]);
519 }
520 }
521
522 static void export_detail_super1(struct supertype *st)
523 {
524 struct mdp_superblock_1 *sb = st->sb;
525 int i;
526 int len = 32;
527
528 for (i=0; i<32; i++)
529 if (sb->set_name[i] == '\n' ||
530 sb->set_name[i] == '\0') {
531 len = i;
532 break;
533 }
534 if (len)
535 printf("MD_NAME=%.*s\n", len, sb->set_name);
536 }
537
538 #endif
539
540 static int match_home1(struct supertype *st, char *homehost)
541 {
542 struct mdp_superblock_1 *sb = st->sb;
543 int l = homehost ? strlen(homehost) : 0;
544
545 return (l > 0 && l < 32 &&
546 sb->set_name[l] == ':' &&
547 strncmp(sb->set_name, homehost, l) == 0);
548 }
549
550 static void uuid_from_super1(struct supertype *st, int uuid[4])
551 {
552 struct mdp_superblock_1 *super = st->sb;
553 char *cuuid = (char*)uuid;
554 int i;
555 for (i=0; i<16; i++)
556 cuuid[i] = super->set_uuid[i];
557 }
558
559 static void getinfo_super1(struct supertype *st, struct mdinfo *info)
560 {
561 struct mdp_superblock_1 *sb = st->sb;
562 int working = 0;
563 int i;
564 int role;
565
566 info->array.major_version = 1;
567 info->array.minor_version = st->minor_version;
568 info->array.patch_version = 0;
569 info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
570 info->array.level = __le32_to_cpu(sb->level);
571 info->array.layout = __le32_to_cpu(sb->layout);
572 info->array.md_minor = -1;
573 info->array.ctime = __le64_to_cpu(sb->ctime);
574 info->array.utime = __le64_to_cpu(sb->utime);
575 info->array.chunk_size = __le32_to_cpu(sb->chunksize)*512;
576 info->array.state =
577 (__le64_to_cpu(sb->resync_offset) >= __le64_to_cpu(sb->size))
578 ? 1 : 0;
579
580 info->data_offset = __le64_to_cpu(sb->data_offset);
581 info->component_size = __le64_to_cpu(sb->size);
582
583 info->disk.major = 0;
584 info->disk.minor = 0;
585 info->disk.number = __le32_to_cpu(sb->dev_number);
586 if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
587 __le32_to_cpu(sb->max_dev) > 512)
588 role = 0xfffe;
589 else
590 role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
591
592 info->disk.raid_disk = -1;
593 switch(role) {
594 case 0xFFFF:
595 info->disk.state = 2; /* spare: ACTIVE, not sync, not faulty */
596 break;
597 case 0xFFFE:
598 info->disk.state = 1; /* faulty */
599 break;
600 default:
601 info->disk.state = 6; /* active and in sync */
602 info->disk.raid_disk = role;
603 }
604 info->events = __le64_to_cpu(sb->events);
605 sprintf(info->text_version, "1.%d", st->minor_version);
606 info->safe_mode_delay = 200;
607
608 memcpy(info->uuid, sb->set_uuid, 16);
609
610 strncpy(info->name, sb->set_name, 32);
611 info->name[32] = 0;
612
613 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
614 info->reshape_active = 1;
615 info->reshape_progress = __le64_to_cpu(sb->reshape_position);
616 info->new_level = __le32_to_cpu(sb->new_level);
617 info->delta_disks = __le32_to_cpu(sb->delta_disks);
618 info->new_layout = __le32_to_cpu(sb->new_layout);
619 info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
620 } else
621 info->reshape_active = 0;
622
623 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
624 role = __le16_to_cpu(sb->dev_roles[i]);
625 if (/*role == 0xFFFF || */role < info->array.raid_disks)
626 working++;
627 }
628
629 info->array.working_disks = working;
630 }
631
632 static int update_super1(struct supertype *st, struct mdinfo *info,
633 char *update,
634 char *devname, int verbose,
635 int uuid_set, char *homehost)
636 {
637 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
638 * For others, the return value is ignored.
639 */
640 int rv = 0;
641 struct mdp_superblock_1 *sb = st->sb;
642
643 if (strcmp(update, "force-one")==0) {
644 /* Not enough devices for a working array,
645 * so bring this one up-to-date
646 */
647 if (sb->events != __cpu_to_le64(info->events))
648 rv = 1;
649 sb->events = __cpu_to_le64(info->events);
650 }
651 if (strcmp(update, "force-array")==0) {
652 /* Degraded array and 'force' requests to
653 * maybe need to mark it 'clean'.
654 */
655 switch(__le32_to_cpu(sb->level)) {
656 case 5: case 4: case 6:
657 /* need to force clean */
658 if (sb->resync_offset != ~0ULL)
659 rv = 1;
660 sb->resync_offset = ~0ULL;
661 }
662 }
663 if (strcmp(update, "assemble")==0) {
664 int d = info->disk.number;
665 int want;
666 if (info->disk.state == 6)
667 want = __cpu_to_le32(info->disk.raid_disk);
668 else
669 want = 0xFFFF;
670 if (sb->dev_roles[d] != want) {
671 sb->dev_roles[d] = want;
672 rv = 1;
673 }
674 }
675 if (strcmp(update, "linear-grow-new") == 0) {
676 int i;
677 int rfd, fd;
678 int max = __le32_to_cpu(sb->max_dev);
679
680 for (i=0 ; i < max ; i++)
681 if (__le16_to_cpu(sb->dev_roles[i]) >= 0xfffe)
682 break;
683 sb->dev_number = __cpu_to_le32(i);
684 info->disk.number = i;
685 if (max >= __le32_to_cpu(sb->max_dev))
686 sb->max_dev = __cpu_to_le32(max+1);
687
688 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
689 read(rfd, sb->device_uuid, 16) != 16) {
690 __u32 r[4] = {random(), random(), random(), random()};
691 memcpy(sb->device_uuid, r, 16);
692 }
693
694 sb->dev_roles[i] =
695 __cpu_to_le16(info->disk.raid_disk);
696
697 fd = open(devname, O_RDONLY);
698 if (fd >= 0) {
699 unsigned long long ds;
700 get_dev_size(fd, devname, &ds);
701 close(fd);
702 ds >>= 9;
703 if (__le64_to_cpu(sb->super_offset) <
704 __le64_to_cpu(sb->data_offset)) {
705 sb->data_size = __cpu_to_le64(
706 ds - __le64_to_cpu(sb->data_offset));
707 } else {
708 ds -= 8*2;
709 ds &= ~(unsigned long long)(4*2-1);
710 sb->super_offset = __cpu_to_le64(ds);
711 sb->data_size = __cpu_to_le64(
712 ds - __le64_to_cpu(sb->data_offset));
713 }
714 }
715 }
716 if (strcmp(update, "linear-grow-update") == 0) {
717 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
718 sb->dev_roles[info->disk.number] =
719 __cpu_to_le16(info->disk.raid_disk);
720 }
721 if (strcmp(update, "resync") == 0) {
722 /* make sure resync happens */
723 sb->resync_offset = 0ULL;
724 }
725 if (strcmp(update, "uuid") == 0) {
726 copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);
727
728 if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
729 struct bitmap_super_s *bm;
730 bm = (struct bitmap_super_s*)(st->sb+1024);
731 memcpy(bm->uuid, sb->set_uuid, 16);
732 }
733 }
734 if (strcmp(update, "homehost") == 0 &&
735 homehost) {
736 char *c;
737 update = "name";
738 c = strchr(sb->set_name, ':');
739 if (c)
740 strncpy(info->name, c+1, 31 - (c-sb->set_name));
741 else
742 strncpy(info->name, sb->set_name, 32);
743 info->name[32] = 0;
744 }
745 if (strcmp(update, "name") == 0) {
746 if (info->name[0] == 0)
747 sprintf(info->name, "%d", info->array.md_minor);
748 memset(sb->set_name, 0, sizeof(sb->set_name));
749 if (homehost &&
750 strchr(info->name, ':') == NULL &&
751 strlen(homehost)+1+strlen(info->name) < 32) {
752 strcpy(sb->set_name, homehost);
753 strcat(sb->set_name, ":");
754 strcat(sb->set_name, info->name);
755 } else
756 strcpy(sb->set_name, info->name);
757 }
758 if (strcmp(update, "devicesize") == 0 &&
759 __le64_to_cpu(sb->super_offset) <
760 __le64_to_cpu(sb->data_offset)) {
761 /* set data_size to device size less data_offset */
762 struct misc_dev_info *misc = (struct misc_dev_info*)
763 (st->sb + 1024 + 512);
764 printf("Size was %llu\n", (unsigned long long)
765 __le64_to_cpu(sb->data_size));
766 sb->data_size = __cpu_to_le64(
767 misc->device_size - __le64_to_cpu(sb->data_offset));
768 printf("Size is %llu\n", (unsigned long long)
769 __le64_to_cpu(sb->data_size));
770 }
771 if (strcmp(update, "_reshape_progress")==0)
772 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
773
774 sb->sb_csum = calc_sb_1_csum(sb);
775 return rv;
776 }
777
778 static int init_super1(struct supertype *st, mdu_array_info_t *info,
779 unsigned long long size, char *name, char *homehost, int *uuid)
780 {
781 struct mdp_superblock_1 *sb;
782 int spares;
783 int rfd;
784 char defname[10];
785
786 if (posix_memalign((void**)&sb, 512, (1024 + 512 +
787 sizeof(struct misc_dev_info))) != 0) {
788 fprintf(stderr, Name
789 ": %s could not allocate superblock\n", __func__);
790 return 0;
791 }
792 memset(sb, 0, 1024);
793
794 st->sb = sb;
795 if (info == NULL) {
796 /* zeroing superblock */
797 return 0;
798 }
799
800 spares = info->working_disks - info->active_disks;
801 if (info->raid_disks + spares > 384) {
802 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
803 info->raid_disks , spares, 384);
804 return 0;
805 }
806
807 sb->magic = __cpu_to_le32(MD_SB_MAGIC);
808 sb->major_version = __cpu_to_le32(1);
809 sb->feature_map = 0;
810 sb->pad0 = 0;
811
812 if (uuid)
813 copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
814 else {
815 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
816 read(rfd, sb->set_uuid, 16) != 16) {
817 __u32 r[4] = {random(), random(), random(), random()};
818 memcpy(sb->set_uuid, r, 16);
819 }
820 if (rfd >= 0) close(rfd);
821 }
822
823 if (name == NULL || *name == 0) {
824 sprintf(defname, "%d", info->md_minor);
825 name = defname;
826 }
827 memset(sb->set_name, 0, 32);
828 if (homehost &&
829 strchr(name, ':')== NULL &&
830 strlen(homehost)+1+strlen(name) < 32) {
831 strcpy(sb->set_name, homehost);
832 strcat(sb->set_name, ":");
833 strcat(sb->set_name, name);
834 } else
835 strcpy(sb->set_name, name);
836
837 sb->ctime = __cpu_to_le64((unsigned long long)time(0));
838 sb->level = __cpu_to_le32(info->level);
839 sb->layout = __cpu_to_le32(info->layout);
840 sb->size = __cpu_to_le64(size*2ULL);
841 sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
842 sb->raid_disks = __cpu_to_le32(info->raid_disks);
843
844 sb->data_offset = __cpu_to_le64(0);
845 sb->data_size = __cpu_to_le64(0);
846 sb->super_offset = __cpu_to_le64(0);
847 sb->recovery_offset = __cpu_to_le64(0);
848
849 sb->utime = sb->ctime;
850 sb->events = __cpu_to_le64(1);
851 if (info->state & (1<<MD_SB_CLEAN))
852 sb->resync_offset = ~0ULL;
853 else
854 sb->resync_offset = 0;
855 sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
856 sizeof(sb->dev_roles[0]));
857 memset(sb->pad3, 0, sizeof(sb->pad3));
858
859 memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
860
861 return 1;
862 }
863
864 struct devinfo {
865 int fd;
866 char *devname;
867 mdu_disk_info_t disk;
868 struct devinfo *next;
869 };
870 #ifndef MDASSEMBLE
871 /* Add a device to the superblock being created */
872 static int add_to_super1(struct supertype *st, mdu_disk_info_t *dk,
873 int fd, char *devname)
874 {
875 struct mdp_superblock_1 *sb = st->sb;
876 __u16 *rp = sb->dev_roles + dk->number;
877 struct devinfo *di, **dip;
878
879 if ((dk->state & 6) == 6) /* active, sync */
880 *rp = __cpu_to_le16(dk->raid_disk);
881 else if ((dk->state & ~2) == 0) /* active or idle -> spare */
882 *rp = 0xffff;
883 else
884 *rp = 0xfffe;
885
886 if (dk->number >= __le32_to_cpu(sb->max_dev) &&
887 __le32_to_cpu(sb->max_dev) < 384)
888 sb->max_dev = __cpu_to_le32(dk->number+1);
889
890 sb->dev_number = __cpu_to_le32(dk->number);
891 sb->sb_csum = calc_sb_1_csum(sb);
892
893 dip = (struct devinfo **)&st->info;
894 while (*dip)
895 dip = &(*dip)->next;
896 di = malloc(sizeof(struct devinfo));
897 di->fd = fd;
898 di->devname = devname;
899 di->disk = *dk;
900 di->next = NULL;
901 *dip = di;
902
903 return 0;
904 }
905 #endif
906
907 static void locate_bitmap1(struct supertype *st, int fd);
908
909 static int store_super1(struct supertype *st, int fd)
910 {
911 struct mdp_superblock_1 *sb = st->sb;
912 unsigned long long sb_offset;
913 int sbsize;
914 unsigned long long dsize;
915
916 if (!get_dev_size(fd, NULL, &dsize))
917 return 1;
918
919 dsize >>= 9;
920
921 if (dsize < 24)
922 return 2;
923
924 /*
925 * Calculate the position of the superblock.
926 * It is always aligned to a 4K boundary and
927 * depending on minor_version, it can be:
928 * 0: At least 8K, but less than 12K, from end of device
929 * 1: At start of device
930 * 2: 4K from start of device.
931 */
932 switch(st->minor_version) {
933 case 0:
934 sb_offset = dsize;
935 sb_offset -= 8*2;
936 sb_offset &= ~(4*2-1);
937 break;
938 case 1:
939 sb_offset = 0;
940 break;
941 case 2:
942 sb_offset = 4*2;
943 break;
944 default:
945 return -EINVAL;
946 }
947
948
949
950 if (sb_offset != __le64_to_cpu(sb->super_offset) &&
951 0 != __le64_to_cpu(sb->super_offset)
952 ) {
953 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
954 abort();
955 }
956
957 if (lseek64(fd, sb_offset << 9, 0)< 0LL)
958 return 3;
959
960 sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
961 sbsize = (sbsize+511)&(~511UL);
962
963 if (awrite(fd, sb, sbsize) != sbsize)
964 return 4;
965
966 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
967 struct bitmap_super_s *bm = (struct bitmap_super_s*)
968 (((char*)sb)+1024);
969 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
970 locate_bitmap1(st, fd);
971 if (awrite(fd, bm, sizeof(*bm)) !=
972 sizeof(*bm))
973 return 5;
974 }
975 }
976 fsync(fd);
977 return 0;
978 }
979
980 static int load_super1(struct supertype *st, int fd, char *devname);
981
982 static unsigned long choose_bm_space(unsigned long devsize)
983 {
984 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
985 * if bigger than 200Gig, save 128k
986 */
987 if (devsize < 64*2) return 0;
988 if (devsize - 64*2 >= 200*1024*1024*2)
989 return 128*2;
990 if (devsize - 4*2 > 8*1024*1024*2)
991 return 64*2;
992 return 4*2;
993 }
994
995 #ifndef MDASSEMBLE
996 static int write_init_super1(struct supertype *st)
997 {
998 struct mdp_superblock_1 *sb = st->sb;
999 struct supertype refst;
1000 int rfd;
1001 int rv = 0;
1002 int bm_space;
1003 struct devinfo *di;
1004 unsigned long long dsize, array_size;
1005 long long sb_offset;
1006
1007 for (di = st->info; di && ! rv ; di = di->next) {
1008 if (di->disk.state == 1)
1009 continue;
1010 if (di->fd < 0)
1011 continue;
1012
1013 Kill(di->devname, 0, 1, 1);
1014 Kill(di->devname, 0, 1, 1);
1015
1016 sb->dev_number = __cpu_to_le32(di->disk.number);
1017 if (di->disk.state & (1<<MD_DISK_WRITEMOSTLY))
1018 sb->devflags |= __cpu_to_le32(WriteMostly1);
1019
1020 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
1021 read(rfd, sb->device_uuid, 16) != 16) {
1022 __u32 r[4] = {random(), random(), random(), random()};
1023 memcpy(sb->device_uuid, r, 16);
1024 }
1025 if (rfd >= 0)
1026 close(rfd);
1027
1028 sb->events = 0;
1029
1030 refst =*st;
1031 refst.sb = NULL;
1032 if (load_super1(&refst, di->fd, NULL)==0) {
1033 struct mdp_superblock_1 *refsb = refst.sb;
1034
1035 memcpy(sb->device_uuid, refsb->device_uuid, 16);
1036 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
1037 /* same array, so preserve events and
1038 * dev_number */
1039 sb->events = refsb->events;
1040 /* bugs in 2.6.17 and earlier mean the
1041 * dev_number chosen in Manage must be preserved
1042 */
1043 if (get_linux_version() >= 2006018)
1044 sb->dev_number = refsb->dev_number;
1045 }
1046 free(refsb);
1047 }
1048
1049 if (!get_dev_size(di->fd, NULL, &dsize))
1050 return 1;
1051 dsize >>= 9;
1052
1053 if (dsize < 24) {
1054 close(di->fd);
1055 return 2;
1056 }
1057
1058
1059 /*
1060 * Calculate the position of the superblock.
1061 * It is always aligned to a 4K boundary and
1062 * depending on minor_version, it can be:
1063 * 0: At least 8K, but less than 12K, from end of device
1064 * 1: At start of device
1065 * 2: 4K from start of device.
1066 * Depending on the array size, we might leave extra space
1067 * for a bitmap.
1068 */
1069 array_size = __le64_to_cpu(sb->size);
1070 /* work out how much space we left for a bitmap */
1071 bm_space = choose_bm_space(array_size);
1072
1073 switch(st->minor_version) {
1074 case 0:
1075 sb_offset = dsize;
1076 sb_offset -= 8*2;
1077 sb_offset &= ~(4*2-1);
1078 sb->super_offset = __cpu_to_le64(sb_offset);
1079 sb->data_offset = __cpu_to_le64(0);
1080 if (sb_offset - bm_space < array_size)
1081 bm_space = sb_offset - array_size;
1082 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
1083 break;
1084 case 1:
1085 sb->super_offset = __cpu_to_le64(0);
1086 if (4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
1087 bm_space = dsize - __le64_to_cpu(sb->size) -4*2;
1088 sb->data_offset = __cpu_to_le64(bm_space + 4*2);
1089 sb->data_size = __cpu_to_le64(dsize - bm_space - 4*2);
1090 break;
1091 case 2:
1092 sb_offset = 4*2;
1093 sb->super_offset = __cpu_to_le64(4*2);
1094 if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size)
1095 > dsize)
1096 bm_space = dsize - __le64_to_cpu(sb->size)
1097 - 4*2 - 4*2;
1098 sb->data_offset = __cpu_to_le64(4*2 + 4*2 + bm_space);
1099 sb->data_size = __cpu_to_le64(dsize - 4*2 - 4*2
1100 - bm_space );
1101 break;
1102 default:
1103 return -EINVAL;
1104 }
1105
1106
1107 sb->sb_csum = calc_sb_1_csum(sb);
1108 rv = store_super1(st, di->fd);
1109 if (rv)
1110 fprintf(stderr,
1111 Name ": failed to write superblock to %s\n",
1112 di->devname);
1113
1114 if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
1115 rv = st->ss->write_bitmap(st, di->fd);
1116 close(di->fd);
1117 di->fd = -1;
1118 }
1119 return rv;
1120 }
1121 #endif
1122
1123 static int compare_super1(struct supertype *st, struct supertype *tst)
1124 {
1125 /*
1126 * return:
1127 * 0 same, or first was empty, and second was copied
1128 * 1 second had wrong number
1129 * 2 wrong uuid
1130 * 3 wrong other info
1131 */
1132 struct mdp_superblock_1 *first = st->sb;
1133 struct mdp_superblock_1 *second = tst->sb;
1134
1135 if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
1136 return 1;
1137 if (second->major_version != __cpu_to_le32(1))
1138 return 1;
1139
1140 if (!first) {
1141 if (posix_memalign((void**)&first, 512,
1142 1024 + 512 +
1143 sizeof(struct misc_dev_info)) != 0) {
1144 fprintf(stderr, Name
1145 ": %s could not allocate superblock\n", __func__);
1146 return 1;
1147 }
1148 memcpy(first, second, 1024 + 512 +
1149 sizeof(struct misc_dev_info));
1150 st->sb = first;
1151 return 0;
1152 }
1153 if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
1154 return 2;
1155
1156 if (first->ctime != second->ctime ||
1157 first->level != second->level ||
1158 first->layout != second->layout ||
1159 first->size != second->size ||
1160 first->chunksize != second->chunksize ||
1161 first->raid_disks != second->raid_disks)
1162 return 3;
1163 return 0;
1164 }
1165
1166 static void free_super1(struct supertype *st);
1167
1168 static int load_super1(struct supertype *st, int fd, char *devname)
1169 {
1170 unsigned long long dsize;
1171 unsigned long long sb_offset;
1172 struct mdp_superblock_1 *super;
1173 int uuid[4];
1174 struct bitmap_super_s *bsb;
1175 struct misc_dev_info *misc;
1176
1177 free_super1(st);
1178
1179 if (st->subarray[0])
1180 return 1;
1181
1182 if (st->ss == NULL || st->minor_version == -1) {
1183 int bestvers = -1;
1184 struct supertype tst;
1185 __u64 bestctime = 0;
1186 /* guess... choose latest ctime */
1187 memset(&tst, 0, sizeof(tst));
1188 tst.ss = &super1;
1189 for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
1190 switch(load_super1(&tst, fd, devname)) {
1191 case 0: super = tst.sb;
1192 if (bestvers == -1 ||
1193 bestctime < __le64_to_cpu(super->ctime)) {
1194 bestvers = tst.minor_version;
1195 bestctime = __le64_to_cpu(super->ctime);
1196 }
1197 free(super);
1198 tst.sb = NULL;
1199 break;
1200 case 1: return 1; /*bad device */
1201 case 2: break; /* bad, try next */
1202 }
1203 }
1204 if (bestvers != -1) {
1205 int rv;
1206 tst.minor_version = bestvers;
1207 tst.ss = &super1;
1208 tst.max_devs = 384;
1209 rv = load_super1(&tst, fd, devname);
1210 if (rv == 0)
1211 *st = tst;
1212 return rv;
1213 }
1214 return 2;
1215 }
1216 if (!get_dev_size(fd, devname, &dsize))
1217 return 1;
1218 dsize >>= 9;
1219
1220 if (dsize < 24) {
1221 if (devname)
1222 fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
1223 devname, dsize);
1224 return 1;
1225 }
1226
1227 /*
1228 * Calculate the position of the superblock.
1229 * It is always aligned to a 4K boundary and
1230 * depending on minor_version, it can be:
1231 * 0: At least 8K, but less than 12K, from end of device
1232 * 1: At start of device
1233 * 2: 4K from start of device.
1234 */
1235 switch(st->minor_version) {
1236 case 0:
1237 sb_offset = dsize;
1238 sb_offset -= 8*2;
1239 sb_offset &= ~(4*2-1);
1240 break;
1241 case 1:
1242 sb_offset = 0;
1243 break;
1244 case 2:
1245 sb_offset = 4*2;
1246 break;
1247 default:
1248 return -EINVAL;
1249 }
1250
1251 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1252
1253
1254 if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1255 if (devname)
1256 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1257 devname, strerror(errno));
1258 return 1;
1259 }
1260
1261 if (posix_memalign((void**)&super, 512,
1262 1024 + 512 +
1263 sizeof(struct misc_dev_info)) != 0) {
1264 fprintf(stderr, Name ": %s could not allocate superblock\n",
1265 __func__);
1266 return 1;
1267 }
1268
1269 if (aread(fd, super, 1024) != 1024) {
1270 if (devname)
1271 fprintf(stderr, Name ": Cannot read superblock on %s\n",
1272 devname);
1273 free(super);
1274 return 1;
1275 }
1276
1277 if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1278 if (devname)
1279 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1280 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1281 free(super);
1282 return 2;
1283 }
1284
1285 if (__le32_to_cpu(super->major_version) != 1) {
1286 if (devname)
1287 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1288 devname, __le32_to_cpu(super->major_version));
1289 free(super);
1290 return 2;
1291 }
1292 if (__le64_to_cpu(super->super_offset) != sb_offset) {
1293 if (devname)
1294 fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1295 devname);
1296 free(super);
1297 return 2;
1298 }
1299 st->sb = super;
1300
1301 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1302
1303 misc = (struct misc_dev_info*) (((char*)super)+1024+512);
1304 misc->device_size = dsize;
1305
1306 /* Now check on the bitmap superblock */
1307 if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1308 return 0;
1309 /* Read the bitmap superblock and make sure it looks
1310 * valid. If it doesn't clear the bit. An --assemble --force
1311 * should get that written out.
1312 */
1313 locate_bitmap1(st, fd);
1314 if (aread(fd, ((char*)super)+1024, 512)
1315 != 512)
1316 goto no_bitmap;
1317
1318 uuid_from_super1(st, uuid);
1319 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1320 memcmp(bsb->uuid, uuid, 16) != 0)
1321 goto no_bitmap;
1322 return 0;
1323
1324 no_bitmap:
1325 super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1326 return 0;
1327 }
1328
1329
1330 static struct supertype *match_metadata_desc1(char *arg)
1331 {
1332 struct supertype *st = malloc(sizeof(*st));
1333 if (!st) return st;
1334
1335 memset(st, 0, sizeof(*st));
1336 st->ss = &super1;
1337 st->max_devs = 384;
1338 st->sb = NULL;
1339 /* leading zeros can be safely ignored. --detail generates them. */
1340 while (*arg == '0')
1341 arg++;
1342 if (strcmp(arg, "1.0") == 0 ||
1343 strcmp(arg, "1.00") == 0) {
1344 st->minor_version = 0;
1345 return st;
1346 }
1347 if (strcmp(arg, "1.1") == 0 ||
1348 strcmp(arg, "1.01") == 0) {
1349 st->minor_version = 1;
1350 return st;
1351 }
1352 if (strcmp(arg, "1.2") == 0 ||
1353 strcmp(arg, "1.02") == 0) {
1354 st->minor_version = 2;
1355 return st;
1356 }
1357 if (strcmp(arg, "1") == 0 ||
1358 strcmp(arg, "default") == 0) {
1359 st->minor_version = -1;
1360 return st;
1361 }
1362
1363 free(st);
1364 return NULL;
1365 }
1366
1367 /* find available size on device with this devsize, using
1368 * superblock type st, and reserving 'reserve' sectors for
1369 * a possible bitmap
1370 */
1371 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1372 {
1373 struct mdp_superblock_1 *super = st->sb;
1374 if (devsize < 24)
1375 return 0;
1376
1377 if (super == NULL)
1378 /* creating: allow suitable space for bitmap */
1379 devsize -= choose_bm_space(devsize);
1380 #ifndef MDASSEMBLE
1381 else if (__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
1382 /* hot-add. allow for actual size of bitmap */
1383 struct bitmap_super_s *bsb;
1384 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1385 devsize -= bitmap_sectors(bsb);
1386 }
1387 #endif
1388
1389 switch(st->minor_version) {
1390 case -1: /* no specified. Now time to set default */
1391 st->minor_version = 0;
1392 /* FALL THROUGH */
1393 case 0:
1394 /* at end */
1395 return ((devsize - 8*2 ) & ~(4*2-1));
1396 case 1:
1397 /* at start, 4K for superblock and possible bitmap */
1398 return devsize - 4*2;
1399 case 2:
1400 /* 4k from start, 4K for superblock and possible bitmap */
1401 return devsize - (4+4)*2;
1402 }
1403 return 0;
1404 }
1405
1406 static int
1407 add_internal_bitmap1(struct supertype *st,
1408 int *chunkp, int delay, int write_behind,
1409 unsigned long long size,
1410 int may_change, int major)
1411 {
1412 /*
1413 * If not may_change, then this is a 'Grow', and the bitmap
1414 * must fit after the superblock.
1415 * If may_change, then this is create, and we can put the bitmap
1416 * before the superblock if we like, or may move the start.
1417 * If !may_change, the bitmap MUST live at offset of 1K, until
1418 * we get a sysfs interface.
1419 *
1420 * size is in sectors, chunk is in bytes !!!
1421 */
1422
1423 unsigned long long bits;
1424 unsigned long long max_bits;
1425 unsigned long long min_chunk;
1426 long offset;
1427 int chunk = *chunkp;
1428 int room = 0;
1429 struct mdp_superblock_1 *sb = st->sb;
1430 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1431
1432 switch(st->minor_version) {
1433 case 0:
1434 /* either 3K after the superblock, or some amount of space
1435 * before.
1436 */
1437 if (may_change) {
1438 /* We are creating array, so we *know* how much room has
1439 * been left.
1440 */
1441 offset = 0;
1442 room = choose_bm_space(__le64_to_cpu(sb->size));
1443 if (room == 4*2) {
1444 /* make it 3K after the superblock */
1445 room = 3*2;
1446 offset = 2;
1447 }
1448 } else {
1449 room = __le64_to_cpu(sb->super_offset)
1450 - __le64_to_cpu(sb->data_offset)
1451 - __le64_to_cpu(sb->data_size);
1452 /* remove '1 ||' when we can set offset via sysfs */
1453 if (1 || (room < 3*2 &&
1454 __le32_to_cpu(sb->max_dev) <= 384)) {
1455 room = 3*2;
1456 offset = 1*2;
1457 } else {
1458 offset = 0; /* means movable offset */
1459 }
1460 }
1461 break;
1462 case 1:
1463 case 2: /* between superblock and data */
1464 if (may_change) {
1465 offset = 4*2;
1466 room = choose_bm_space(__le64_to_cpu(sb->size));
1467 } else {
1468 room = __le64_to_cpu(sb->data_offset)
1469 - __le64_to_cpu(sb->super_offset);
1470 if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1471 room -= 2;
1472 offset = 2;
1473 } else {
1474 room -= 4*2;
1475 offset = 4*2;
1476 }
1477 }
1478 break;
1479 default:
1480 return 0;
1481 }
1482
1483 if (chunk == UnSet && room > 128*2)
1484 /* Limit to 128K of bitmap when chunk size not requested */
1485 room = 128*2;
1486
1487 max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1488
1489 min_chunk = 4096; /* sub-page chunks don't work yet.. */
1490 bits = (size*512)/min_chunk +1;
1491 while (bits > max_bits) {
1492 min_chunk *= 2;
1493 bits = (bits+1)/2;
1494 }
1495 if (chunk == UnSet)
1496 chunk = min_chunk;
1497 else if (chunk < min_chunk)
1498 return 0; /* chunk size too small */
1499 if (chunk == 0) /* rounding problem */
1500 return 0;
1501
1502 if (offset == 0) {
1503 bits = (size*512) / chunk + 1;
1504 room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
1505 offset = -room;
1506 }
1507
1508 sb->bitmap_offset = __cpu_to_le32(offset);
1509
1510 sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1511 memset(bms, 0, sizeof(*bms));
1512 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1513 bms->version = __cpu_to_le32(major);
1514 uuid_from_super1(st, (int*)bms->uuid);
1515 bms->chunksize = __cpu_to_le32(chunk);
1516 bms->daemon_sleep = __cpu_to_le32(delay);
1517 bms->sync_size = __cpu_to_le64(size);
1518 bms->write_behind = __cpu_to_le32(write_behind);
1519
1520 *chunkp = chunk;
1521 return 1;
1522 }
1523
1524
1525 static void locate_bitmap1(struct supertype *st, int fd)
1526 {
1527 unsigned long long offset;
1528 struct mdp_superblock_1 *sb;
1529 int mustfree = 0;
1530
1531 if (!st->sb) {
1532 if (st->ss->load_super(st, fd, NULL))
1533 return; /* no error I hope... */
1534 mustfree = 1;
1535 }
1536 sb = st->sb;
1537
1538 offset = __le64_to_cpu(sb->super_offset);
1539 offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
1540 if (mustfree)
1541 free(sb);
1542 lseek64(fd, offset<<9, 0);
1543 }
1544
1545 static int write_bitmap1(struct supertype *st, int fd)
1546 {
1547 struct mdp_superblock_1 *sb = st->sb;
1548 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1549 int rv = 0;
1550
1551 int towrite, n;
1552 char *buf = (char*)(((long)(abuf+4096))&~4095UL);
1553
1554 locate_bitmap1(st, fd);
1555
1556 memset(buf, 0xff, 4096);
1557 memcpy(buf, ((char*)sb)+1024, sizeof(bitmap_super_t));
1558
1559 towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1560 towrite = (towrite+7) >> 3; /* bits to bytes */
1561 towrite += sizeof(bitmap_super_t);
1562 towrite = ROUND_UP(towrite, 512);
1563 while (towrite > 0) {
1564 n = towrite;
1565 if (n > 4096)
1566 n = 4096;
1567 n = write(fd, buf, n);
1568 if (n > 0)
1569 towrite -= n;
1570 else
1571 break;
1572 memset(buf, 0xff, 4096);
1573 }
1574 fsync(fd);
1575 if (towrite)
1576 rv = -2;
1577
1578 return rv;
1579 }
1580
1581 static void free_super1(struct supertype *st)
1582 {
1583 if (st->sb)
1584 free(st->sb);
1585 st->sb = NULL;
1586 }
1587
1588 #ifndef MDASSEMBLE
1589 static int validate_geometry1(struct supertype *st, int level,
1590 int layout, int raiddisks,
1591 int chunk, unsigned long long size,
1592 char *subdev, unsigned long long *freesize,
1593 int verbose)
1594 {
1595 unsigned long long ldsize;
1596 int fd;
1597
1598 if (level == LEVEL_CONTAINER)
1599 return 0;
1600 if (!subdev)
1601 return 1;
1602
1603 fd = open(subdev, O_RDONLY|O_EXCL, 0);
1604 if (fd < 0) {
1605 if (verbose)
1606 fprintf(stderr, Name ": super1.x cannot open %s: %s\n",
1607 subdev, strerror(errno));
1608 return 0;
1609 }
1610
1611 if (!get_dev_size(fd, subdev, &ldsize)) {
1612 close(fd);
1613 return 0;
1614 }
1615 close(fd);
1616
1617 *freesize = avail_size1(st, ldsize >> 9);
1618 return 1;
1619 }
1620 #endif /* MDASSEMBLE */
1621
1622 struct superswitch super1 = {
1623 #ifndef MDASSEMBLE
1624 .examine_super = examine_super1,
1625 .brief_examine_super = brief_examine_super1,
1626 .export_examine_super = export_examine_super1,
1627 .detail_super = detail_super1,
1628 .brief_detail_super = brief_detail_super1,
1629 .export_detail_super = export_detail_super1,
1630 .write_init_super = write_init_super1,
1631 .validate_geometry = validate_geometry1,
1632 .add_to_super = add_to_super1,
1633 #endif
1634 .match_home = match_home1,
1635 .uuid_from_super = uuid_from_super1,
1636 .getinfo_super = getinfo_super1,
1637 .update_super = update_super1,
1638 .init_super = init_super1,
1639 .store_super = store_super1,
1640 .compare_super = compare_super1,
1641 .load_super = load_super1,
1642 .match_metadata_desc = match_metadata_desc1,
1643 .avail_size = avail_size1,
1644 .add_internal_bitmap = add_internal_bitmap1,
1645 .locate_bitmap = locate_bitmap1,
1646 .write_bitmap = write_bitmap1,
1647 .free_super = free_super1,
1648 #if __BYTE_ORDER == BIG_ENDIAN
1649 .swapuuid = 0,
1650 #else
1651 .swapuuid = 1,
1652 #endif
1653 .name = "1.x",
1654 };
Unnamed repository; edit this file 'description' to name the repository.