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