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