]> git.ipfire.org Git - thirdparty/mdadm.git/blob - super1.c
projects / thirdparty / mdadm.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
trivial warn_unused_result squashing
[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 : near=%d, %s=%d\n",
252 __le32_to_cpu(sb->new_layout)&255,
253 (__le32_to_cpu(sb->new_layout)&0x10000)?"offset":"far",
254 (__le32_to_cpu(sb->new_layout)>>8)&255);
255 }
256 }
257 if (__le32_to_cpu(sb->new_chunk) != __le32_to_cpu(sb->chunksize))
258 printf(" New Chunksize : %dK\n", __le32_to_cpu(sb->new_chunk)/2);
259 printf("\n");
260 }
261 if (sb->devflags) {
262 printf(" Flags :");
263 if (sb->devflags & WriteMostly1)
264 printf(" write-mostly");
265 printf("\n");
266 }
267
268 atime = __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL;
269 printf(" Update Time : %.24s\n", ctime(&atime));
270
271 if (calc_sb_1_csum(sb) == sb->sb_csum)
272 printf(" Checksum : %x - correct\n", __le32_to_cpu(sb->sb_csum));
273 else
274 printf(" Checksum : %x - expected %x\n", __le32_to_cpu(sb->sb_csum),
275 __le32_to_cpu(calc_sb_1_csum(sb)));
276 printf(" Events : %llu\n", (unsigned long long)__le64_to_cpu(sb->events));
277 printf("\n");
278 if (__le32_to_cpu(sb->level) == 5) {
279 c = map_num(r5layout, __le32_to_cpu(sb->layout));
280 printf(" Layout : %s\n", c?c:"-unknown-");
281 }
282 if (__le32_to_cpu(sb->level) == 10) {
283 int lo = __le32_to_cpu(sb->layout);
284 printf(" Layout : near=%d, %s=%d\n",
285 lo&255,
286 (lo&0x10000)?"offset":"far",
287 (lo>>8)&255);
288 }
289 switch(__le32_to_cpu(sb->level)) {
290 case 0:
291 case 4:
292 case 5:
293 case 6:
294 case 10:
295 printf(" Chunk Size : %dK\n", __le32_to_cpu(sb->chunksize)/2);
296 break;
297 case -1:
298 printf(" Rounding : %dK\n", __le32_to_cpu(sb->chunksize)/2);
299 break;
300 default: break;
301 }
302 printf("\n");
303 printf(" Array Slot : %d (", __le32_to_cpu(sb->dev_number));
304 for (i= __le32_to_cpu(sb->max_dev); i> 0 ; i--)
305 if (__le16_to_cpu(sb->dev_roles[i-1]) != 0xffff)
306 break;
307 for (d=0; d < i; d++) {
308 int role = __le16_to_cpu(sb->dev_roles[d]);
309 if (d) printf(", ");
310 if (role == 0xffff) printf("empty");
311 else if(role == 0xfffe) printf("failed");
312 else printf("%d", role);
313 }
314 printf(")\n");
315 printf(" Array State : ");
316 for (d=0; d<__le32_to_cpu(sb->raid_disks); d++) {
317 int cnt = 0;
318 int me = 0;
319 int i;
320 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
321 int role = __le16_to_cpu(sb->dev_roles[i]);
322 if (role == d) {
323 if (i == __le32_to_cpu(sb->dev_number))
324 me = 1;
325 cnt++;
326 }
327 }
328 if (cnt > 1) printf("?");
329 else if (cnt == 1 && me) printf("U");
330 else if (cnt == 1) printf("u");
331 else printf ("_");
332 }
333 faulty = 0;
334 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
335 int role = __le16_to_cpu(sb->dev_roles[i]);
336 if (role == 0xFFFE)
337 faulty++;
338 }
339 if (faulty) printf(" %d failed", faulty);
340 printf("\n");
341 }
342
343
344 static void brief_examine_super1(struct supertype *st)
345 {
346 struct mdp_superblock_1 *sb = st->sb;
347 int i;
348 unsigned long long sb_offset;
349 char *nm;
350 char *c=map_num(pers, __le32_to_cpu(sb->level));
351
352 nm = strchr(sb->set_name, ':');
353 if (nm)
354 nm++;
355 else if (sb->set_name[0])
356 nm = sb->set_name;
357 else
358 nm = "??";
359
360 printf("ARRAY /dev/md/%s level=%s ", nm, 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;
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 if (strcmp(update, "linear-grow-update") == 0) {
623 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
624 sb->dev_roles[info->disk.number] =
625 __cpu_to_le16(info->disk.raid_disk);
626 }
627 if (strcmp(update, "resync") == 0) {
628 /* make sure resync happens */
629 sb->resync_offset = 0ULL;
630 }
631 if (strcmp(update, "uuid") == 0) {
632 copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);
633
634 if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
635 struct bitmap_super_s *bm;
636 bm = (struct bitmap_super_s*)(st->sb+1024);
637 memcpy(bm->uuid, sb->set_uuid, 16);
638 }
639 }
640 if (strcmp(update, "homehost") == 0 &&
641 homehost) {
642 char *c;
643 update = "name";
644 c = strchr(sb->set_name, ':');
645 if (c)
646 strncpy(info->name, c+1, 31 - (c-sb->set_name));
647 else
648 strncpy(info->name, sb->set_name, 32);
649 info->name[32] = 0;
650 }
651 if (strcmp(update, "name") == 0) {
652 if (info->name[0] == 0)
653 sprintf(info->name, "%d", info->array.md_minor);
654 memset(sb->set_name, 0, sizeof(sb->set_name));
655 if (homehost &&
656 strchr(info->name, ':') == NULL &&
657 strlen(homehost)+1+strlen(info->name) < 32) {
658 strcpy(sb->set_name, homehost);
659 strcat(sb->set_name, ":");
660 strcat(sb->set_name, info->name);
661 } else
662 strcpy(sb->set_name, info->name);
663 }
664 if (strcmp(update, "devicesize") == 0 &&
665 __le64_to_cpu(sb->super_offset) <
666 __le64_to_cpu(sb->data_offset)) {
667 /* set data_size to device size less data_offset */
668 struct misc_dev_info *misc = (struct misc_dev_info*)
669 (st->sb + 1024 + 512);
670 printf("Size was %llu\n", (unsigned long long)
671 __le64_to_cpu(sb->data_size));
672 sb->data_size = __cpu_to_le64(
673 misc->device_size - __le64_to_cpu(sb->data_offset));
674 printf("Size is %llu\n", (unsigned long long)
675 __le64_to_cpu(sb->data_size));
676 }
677 if (strcmp(update, "_reshape_progress")==0)
678 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
679
680 sb->sb_csum = calc_sb_1_csum(sb);
681 return rv;
682 }
683
684 static int init_super1(struct supertype *st, mdu_array_info_t *info,
685 unsigned long long size, char *name, char *homehost, int *uuid)
686 {
687 struct mdp_superblock_1 *sb;
688 int spares;
689 int rfd;
690 char defname[10];
691
692 if (posix_memalign((void**)&sb, 512, (1024 + 512 +
693 sizeof(struct misc_dev_info))) != 0) {
694 fprintf(stderr, Name
695 ": %s could not allocate superblock\n", __func__);
696 return 0;
697 }
698 memset(sb, 0, 1024);
699
700 st->sb = sb;
701 if (info == NULL) {
702 /* zeroing superblock */
703 return 0;
704 }
705
706 spares = info->working_disks - info->active_disks;
707 if (info->raid_disks + spares > 384) {
708 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
709 info->raid_disks , spares, 384);
710 return 0;
711 }
712
713 sb->magic = __cpu_to_le32(MD_SB_MAGIC);
714 sb->major_version = __cpu_to_le32(1);
715 sb->feature_map = 0;
716 sb->pad0 = 0;
717
718 if (uuid)
719 copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
720 else {
721 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
722 read(rfd, sb->set_uuid, 16) != 16) {
723 *(__u32*)(sb->set_uuid) = random();
724 *(__u32*)(sb->set_uuid+4) = random();
725 *(__u32*)(sb->set_uuid+8) = random();
726 *(__u32*)(sb->set_uuid+12) = random();
727 }
728 if (rfd >= 0) close(rfd);
729 }
730
731 if (name == NULL || *name == 0) {
732 sprintf(defname, "%d", info->md_minor);
733 name = defname;
734 }
735 memset(sb->set_name, 0, 32);
736 if (homehost &&
737 strchr(name, ':')== NULL &&
738 strlen(homehost)+1+strlen(name) < 32) {
739 strcpy(sb->set_name, homehost);
740 strcat(sb->set_name, ":");
741 strcat(sb->set_name, name);
742 } else
743 strcpy(sb->set_name, name);
744
745 sb->ctime = __cpu_to_le64((unsigned long long)time(0));
746 sb->level = __cpu_to_le32(info->level);
747 sb->layout = __cpu_to_le32(info->layout);
748 sb->size = __cpu_to_le64(size*2ULL);
749 sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
750 sb->raid_disks = __cpu_to_le32(info->raid_disks);
751
752 sb->data_offset = __cpu_to_le64(0);
753 sb->data_size = __cpu_to_le64(0);
754 sb->super_offset = __cpu_to_le64(0);
755 sb->recovery_offset = __cpu_to_le64(0);
756
757 sb->utime = sb->ctime;
758 sb->events = __cpu_to_le64(1);
759 if (info->state & (1<<MD_SB_CLEAN))
760 sb->resync_offset = ~0ULL;
761 else
762 sb->resync_offset = 0;
763 sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
764 sizeof(sb->dev_roles[0]));
765 memset(sb->pad3, 0, sizeof(sb->pad3));
766
767 memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
768
769 return 1;
770 }
771
772 struct devinfo {
773 int fd;
774 char *devname;
775 mdu_disk_info_t disk;
776 struct devinfo *next;
777 };
778 #ifndef MDASSEMBLE
779 /* Add a device to the superblock being created */
780 static void add_to_super1(struct supertype *st, mdu_disk_info_t *dk,
781 int fd, char *devname)
782 {
783 struct mdp_superblock_1 *sb = st->sb;
784 __u16 *rp = sb->dev_roles + dk->number;
785 struct devinfo *di, **dip;
786
787 if ((dk->state & 6) == 6) /* active, sync */
788 *rp = __cpu_to_le16(dk->raid_disk);
789 else if ((dk->state & ~2) == 0) /* active or idle -> spare */
790 *rp = 0xffff;
791 else
792 *rp = 0xfffe;
793
794 sb->dev_number = __cpu_to_le32(dk->number);
795 sb->sb_csum = calc_sb_1_csum(sb);
796
797 dip = (struct devinfo **)&st->info;
798 while (*dip)
799 dip = &(*dip)->next;
800 di = malloc(sizeof(struct devinfo));
801 di->fd = fd;
802 di->devname = devname;
803 di->disk = *dk;
804 di->next = NULL;
805 *dip = di;
806 }
807 #endif
808
809 static void locate_bitmap1(struct supertype *st, int fd);
810
811 static int store_super1(struct supertype *st, int fd)
812 {
813 struct mdp_superblock_1 *sb = st->sb;
814 unsigned long long sb_offset;
815 int sbsize;
816 unsigned long long dsize;
817
818 if (!get_dev_size(fd, NULL, &dsize))
819 return 1;
820
821 dsize >>= 9;
822
823 if (dsize < 24)
824 return 2;
825
826 /*
827 * Calculate the position of the superblock.
828 * It is always aligned to a 4K boundary and
829 * depending on minor_version, it can be:
830 * 0: At least 8K, but less than 12K, from end of device
831 * 1: At start of device
832 * 2: 4K from start of device.
833 */
834 switch(st->minor_version) {
835 case 0:
836 sb_offset = dsize;
837 sb_offset -= 8*2;
838 sb_offset &= ~(4*2-1);
839 break;
840 case 1:
841 sb_offset = 0;
842 break;
843 case 2:
844 sb_offset = 4*2;
845 break;
846 default:
847 return -EINVAL;
848 }
849
850
851
852 if (sb_offset != __le64_to_cpu(sb->super_offset) &&
853 0 != __le64_to_cpu(sb->super_offset)
854 ) {
855 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
856 abort();
857 }
858
859 if (lseek64(fd, sb_offset << 9, 0)< 0LL)
860 return 3;
861
862 sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
863 sbsize = (sbsize+511)&(~511UL);
864
865 if (write(fd, sb, sbsize) != sbsize)
866 return 4;
867
868 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
869 struct bitmap_super_s *bm = (struct bitmap_super_s*)
870 (((char*)sb)+1024);
871 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
872 locate_bitmap1(st, fd);
873 if (write(fd, bm, ROUND_UP(sizeof(*bm),512)) !=
874 ROUND_UP(sizeof(*bm),512))
875 return 5;
876 }
877 }
878 fsync(fd);
879 return 0;
880 }
881
882 static int load_super1(struct supertype *st, int fd, char *devname);
883
884 static unsigned long choose_bm_space(unsigned long devsize)
885 {
886 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
887 * if bigger than 200Gig, save 128k
888 */
889 if (devsize < 64*2) return 0;
890 if (devsize - 64*2 >= 200*1024*1024*2)
891 return 128*2;
892 if (devsize - 4*2 > 8*1024*1024*2)
893 return 64*2;
894 return 4*2;
895 }
896
897 #ifndef MDASSEMBLE
898 static int write_init_super1(struct supertype *st)
899 {
900 struct mdp_superblock_1 *sb = st->sb;
901 struct supertype refst;
902 int rfd;
903 int rv = 0;
904 int bm_space;
905 struct devinfo *di;
906 unsigned long long dsize, array_size;
907 long long sb_offset;
908
909 for (di = st->info; di && ! rv ; di = di->next) {
910 if (di->disk.state == 1)
911 continue;
912 if (di->fd < 0)
913 continue;
914
915 Kill(di->devname, 0, 1, 1);
916 Kill(di->devname, 0, 1, 1);
917
918 sb->dev_number = __cpu_to_le32(di->disk.number);
919 if (di->disk.state & (1<<MD_DISK_WRITEMOSTLY))
920 sb->devflags |= __cpu_to_le32(WriteMostly1);
921
922 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
923 read(rfd, sb->device_uuid, 16) != 16) {
924 *(__u32*)(sb->device_uuid) = random();
925 *(__u32*)(sb->device_uuid+4) = random();
926 *(__u32*)(sb->device_uuid+8) = random();
927 *(__u32*)(sb->device_uuid+12) = random();
928 }
929 if (rfd >= 0) close(rfd);
930 sb->events = 0;
931
932 refst =*st;
933 refst.sb = NULL;
934 if (load_super1(&refst, di->fd, NULL)==0) {
935 struct mdp_superblock_1 *refsb = refst.sb;
936
937 memcpy(sb->device_uuid, refsb->device_uuid, 16);
938 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
939 /* same array, so preserve events and
940 * dev_number */
941 sb->events = refsb->events;
942 /* bugs in 2.6.17 and earlier mean the
943 * dev_number chosen in Manage must be preserved
944 */
945 if (get_linux_version() >= 2006018)
946 sb->dev_number = refsb->dev_number;
947 }
948 free(refsb);
949 }
950
951 if (!get_dev_size(di->fd, NULL, &dsize))
952 return 1;
953 dsize >>= 9;
954
955 if (dsize < 24) {
956 close(di->fd);
957 return 2;
958 }
959
960
961 /*
962 * Calculate the position of the superblock.
963 * It is always aligned to a 4K boundary and
964 * depending on minor_version, it can be:
965 * 0: At least 8K, but less than 12K, from end of device
966 * 1: At start of device
967 * 2: 4K from start of device.
968 * Depending on the array size, we might leave extra space
969 * for a bitmap.
970 */
971 array_size = __le64_to_cpu(sb->size);
972 /* work out how much space we left for a bitmap */
973 bm_space = choose_bm_space(array_size);
974
975 switch(st->minor_version) {
976 case 0:
977 sb_offset = dsize;
978 sb_offset -= 8*2;
979 sb_offset &= ~(4*2-1);
980 sb->super_offset = __cpu_to_le64(sb_offset);
981 sb->data_offset = __cpu_to_le64(0);
982 if (sb_offset - bm_space < array_size)
983 bm_space = sb_offset - array_size;
984 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
985 break;
986 case 1:
987 sb->super_offset = __cpu_to_le64(0);
988 if (4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
989 bm_space = dsize - __le64_to_cpu(sb->size) -4*2;
990 sb->data_offset = __cpu_to_le64(bm_space + 4*2);
991 sb->data_size = __cpu_to_le64(dsize - bm_space - 4*2);
992 break;
993 case 2:
994 sb_offset = 4*2;
995 sb->super_offset = __cpu_to_le64(4*2);
996 if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size)
997 > dsize)
998 bm_space = dsize - __le64_to_cpu(sb->size)
999 - 4*2 - 4*2;
1000 sb->data_offset = __cpu_to_le64(4*2 + 4*2 + bm_space);
1001 sb->data_size = __cpu_to_le64(dsize - 4*2 - 4*2
1002 - bm_space );
1003 break;
1004 default:
1005 return -EINVAL;
1006 }
1007
1008
1009 sb->sb_csum = calc_sb_1_csum(sb);
1010 rv = store_super1(st, di->fd);
1011 if (rv)
1012 fprintf(stderr,
1013 Name ": failed to write superblock to %s\n",
1014 di->devname);
1015
1016 if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
1017 rv = st->ss->write_bitmap(st, di->fd);
1018 close(di->fd);
1019 di->fd = -1;
1020 }
1021 return rv;
1022 }
1023 #endif
1024
1025 static int compare_super1(struct supertype *st, struct supertype *tst)
1026 {
1027 /*
1028 * return:
1029 * 0 same, or first was empty, and second was copied
1030 * 1 second had wrong number
1031 * 2 wrong uuid
1032 * 3 wrong other info
1033 */
1034 struct mdp_superblock_1 *first = st->sb;
1035 struct mdp_superblock_1 *second = tst->sb;
1036
1037 if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
1038 return 1;
1039 if (second->major_version != __cpu_to_le32(1))
1040 return 1;
1041
1042 if (!first) {
1043 if (posix_memalign((void**)&first, 512,
1044 1024 + 512 +
1045 sizeof(struct misc_dev_info)) != 0) {
1046 fprintf(stderr, Name
1047 ": %s could not allocate superblock\n", __func__);
1048 return 1;
1049 }
1050 memcpy(first, second, 1024 + 512 +
1051 sizeof(struct misc_dev_info));
1052 st->sb = first;
1053 return 0;
1054 }
1055 if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
1056 return 2;
1057
1058 if (first->ctime != second->ctime ||
1059 first->level != second->level ||
1060 first->layout != second->layout ||
1061 first->size != second->size ||
1062 first->chunksize != second->chunksize ||
1063 first->raid_disks != second->raid_disks)
1064 return 3;
1065 return 0;
1066 }
1067
1068 static void free_super1(struct supertype *st);
1069
1070 static int load_super1(struct supertype *st, int fd, char *devname)
1071 {
1072 unsigned long long dsize;
1073 unsigned long long sb_offset;
1074 struct mdp_superblock_1 *super;
1075 int uuid[4];
1076 struct bitmap_super_s *bsb;
1077 struct misc_dev_info *misc;
1078
1079 free_super1(st);
1080
1081 if (st->subarray[0])
1082 return 1;
1083
1084 if (st->ss == NULL || st->minor_version == -1) {
1085 int bestvers = -1;
1086 struct supertype tst;
1087 __u64 bestctime = 0;
1088 /* guess... choose latest ctime */
1089 memset(&tst, 0, sizeof(tst));
1090 tst.ss = &super1;
1091 for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
1092 switch(load_super1(&tst, fd, devname)) {
1093 case 0: super = tst.sb;
1094 if (bestvers == -1 ||
1095 bestctime < __le64_to_cpu(super->ctime)) {
1096 bestvers = tst.minor_version;
1097 bestctime = __le64_to_cpu(super->ctime);
1098 }
1099 free(super);
1100 tst.sb = NULL;
1101 break;
1102 case 1: return 1; /*bad device */
1103 case 2: break; /* bad, try next */
1104 }
1105 }
1106 if (bestvers != -1) {
1107 int rv;
1108 tst.minor_version = bestvers;
1109 tst.ss = &super1;
1110 tst.max_devs = 384;
1111 rv = load_super1(&tst, fd, devname);
1112 if (rv == 0)
1113 *st = tst;
1114 return rv;
1115 }
1116 return 2;
1117 }
1118 if (!get_dev_size(fd, devname, &dsize))
1119 return 1;
1120 dsize >>= 9;
1121
1122 if (dsize < 24) {
1123 if (devname)
1124 fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
1125 devname, dsize);
1126 return 1;
1127 }
1128
1129 /*
1130 * Calculate the position of the superblock.
1131 * It is always aligned to a 4K boundary and
1132 * depending on minor_version, it can be:
1133 * 0: At least 8K, but less than 12K, from end of device
1134 * 1: At start of device
1135 * 2: 4K from start of device.
1136 */
1137 switch(st->minor_version) {
1138 case 0:
1139 sb_offset = dsize;
1140 sb_offset -= 8*2;
1141 sb_offset &= ~(4*2-1);
1142 break;
1143 case 1:
1144 sb_offset = 0;
1145 break;
1146 case 2:
1147 sb_offset = 4*2;
1148 break;
1149 default:
1150 return -EINVAL;
1151 }
1152
1153 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1154
1155
1156 if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1157 if (devname)
1158 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1159 devname, strerror(errno));
1160 return 1;
1161 }
1162
1163 if (posix_memalign((void**)&super, 512,
1164 1024 + 512 +
1165 sizeof(struct misc_dev_info)) != 0) {
1166 fprintf(stderr, Name ": %s could not allocate superblock\n",
1167 __func__);
1168 return 1;
1169 }
1170
1171 if (read(fd, super, 1024) != 1024) {
1172 if (devname)
1173 fprintf(stderr, Name ": Cannot read superblock on %s\n",
1174 devname);
1175 free(super);
1176 return 1;
1177 }
1178
1179 if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1180 if (devname)
1181 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1182 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1183 free(super);
1184 return 2;
1185 }
1186
1187 if (__le32_to_cpu(super->major_version) != 1) {
1188 if (devname)
1189 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1190 devname, __le32_to_cpu(super->major_version));
1191 free(super);
1192 return 2;
1193 }
1194 if (__le64_to_cpu(super->super_offset) != sb_offset) {
1195 if (devname)
1196 fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1197 devname);
1198 free(super);
1199 return 2;
1200 }
1201 st->sb = super;
1202
1203 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1204
1205 misc = (struct misc_dev_info*) (((char*)super)+1024+512);
1206 misc->device_size = dsize;
1207
1208 /* Now check on the bitmap superblock */
1209 if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1210 return 0;
1211 /* Read the bitmap superblock and make sure it looks
1212 * valid. If it doesn't clear the bit. An --assemble --force
1213 * should get that written out.
1214 */
1215 locate_bitmap1(st, fd);
1216 if (read(fd, ((char*)super)+1024, 512)
1217 != 512)
1218 goto no_bitmap;
1219
1220 uuid_from_super1(st, uuid);
1221 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1222 memcmp(bsb->uuid, uuid, 16) != 0)
1223 goto no_bitmap;
1224 return 0;
1225
1226 no_bitmap:
1227 super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1228 return 0;
1229 }
1230
1231
1232 static struct supertype *match_metadata_desc1(char *arg)
1233 {
1234 struct supertype *st = malloc(sizeof(*st));
1235 if (!st) return st;
1236
1237 memset(st, 0, sizeof(*st));
1238 st->ss = &super1;
1239 st->max_devs = 384;
1240 st->sb = NULL;
1241 /* leading zeros can be safely ignored. --detail generates them. */
1242 while (*arg == '0')
1243 arg++;
1244 if (strcmp(arg, "1.0") == 0 ||
1245 strcmp(arg, "1.00") == 0) {
1246 st->minor_version = 0;
1247 return st;
1248 }
1249 if (strcmp(arg, "1.1") == 0 ||
1250 strcmp(arg, "1.01") == 0) {
1251 st->minor_version = 1;
1252 return st;
1253 }
1254 if (strcmp(arg, "1.2") == 0 ||
1255 strcmp(arg, "1.02") == 0) {
1256 st->minor_version = 2;
1257 return st;
1258 }
1259 if (strcmp(arg, "1") == 0 ||
1260 strcmp(arg, "default") == 0) {
1261 st->minor_version = -1;
1262 return st;
1263 }
1264
1265 free(st);
1266 return NULL;
1267 }
1268
1269 /* find available size on device with this devsize, using
1270 * superblock type st, and reserving 'reserve' sectors for
1271 * a possible bitmap
1272 */
1273 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1274 {
1275 if (devsize < 24)
1276 return 0;
1277
1278 devsize -= choose_bm_space(devsize);
1279
1280 switch(st->minor_version) {
1281 case -1: /* no specified. Now time to set default */
1282 st->minor_version = 0;
1283 /* FALL THROUGH */
1284 case 0:
1285 /* at end */
1286 return ((devsize - 8*2 ) & ~(4*2-1));
1287 case 1:
1288 /* at start, 4K for superblock and possible bitmap */
1289 return devsize - 4*2;
1290 case 2:
1291 /* 4k from start, 4K for superblock and possible bitmap */
1292 return devsize - (4+4)*2;
1293 }
1294 return 0;
1295 }
1296
1297 static int
1298 add_internal_bitmap1(struct supertype *st,
1299 int *chunkp, int delay, int write_behind,
1300 unsigned long long size,
1301 int may_change, int major)
1302 {
1303 /*
1304 * If not may_change, then this is a 'Grow', and the bitmap
1305 * must fit after the superblock.
1306 * If may_change, then this is create, and we can put the bitmap
1307 * before the superblock if we like, or may move the start.
1308 * If !may_change, the bitmap MUST live at offset of 1K, until
1309 * we get a sysfs interface.
1310 *
1311 * size is in sectors, chunk is in bytes !!!
1312 */
1313
1314 unsigned long long bits;
1315 unsigned long long max_bits;
1316 unsigned long long min_chunk;
1317 long offset;
1318 int chunk = *chunkp;
1319 int room = 0;
1320 struct mdp_superblock_1 *sb = st->sb;
1321 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1322
1323 switch(st->minor_version) {
1324 case 0:
1325 /* either 3K after the superblock, or some amount of space
1326 * before.
1327 */
1328 if (may_change) {
1329 /* We are creating array, so we *know* how much room has
1330 * been left.
1331 */
1332 offset = 0;
1333 room = choose_bm_space(__le64_to_cpu(sb->size));
1334 if (room == 4*2) {
1335 /* make it 3K after the superblock */
1336 room = 3*2;
1337 offset = 2;
1338 }
1339 } else {
1340 room = __le64_to_cpu(sb->super_offset)
1341 - __le64_to_cpu(sb->data_offset)
1342 - __le64_to_cpu(sb->data_size);
1343 /* remove '1 ||' when we can set offset via sysfs */
1344 if (1 || (room < 3*2 &&
1345 __le32_to_cpu(sb->max_dev) <= 384)) {
1346 room = 3*2;
1347 offset = 1*2;
1348 } else {
1349 offset = 0; /* means movable offset */
1350 }
1351 }
1352 break;
1353 case 1:
1354 case 2: /* between superblock and data */
1355 if (may_change) {
1356 offset = 4*2;
1357 room = choose_bm_space(__le64_to_cpu(sb->size));
1358 } else {
1359 room = __le64_to_cpu(sb->data_offset)
1360 - __le64_to_cpu(sb->super_offset);
1361 if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1362 room -= 2;
1363 offset = 2;
1364 } else {
1365 room -= 4*2;
1366 offset = 4*2;
1367 }
1368 }
1369 break;
1370 default:
1371 return 0;
1372 }
1373
1374 if (chunk == UnSet && room > 128*2)
1375 /* Limit to 128K of bitmap when chunk size not requested */
1376 room = 128*2;
1377
1378 max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1379
1380 min_chunk = 4096; /* sub-page chunks don't work yet.. */
1381 bits = (size*512)/min_chunk +1;
1382 while (bits > max_bits) {
1383 min_chunk *= 2;
1384 bits = (bits+1)/2;
1385 }
1386 if (chunk == UnSet)
1387 chunk = min_chunk;
1388 else if (chunk < min_chunk)
1389 return 0; /* chunk size too small */
1390 if (chunk == 0) /* rounding problem */
1391 return 0;
1392
1393 if (offset == 0) {
1394 bits = (size*512) / chunk + 1;
1395 room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
1396 offset = -room;
1397 }
1398
1399 sb->bitmap_offset = __cpu_to_le32(offset);
1400
1401 sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1402 memset(bms, 0, sizeof(*bms));
1403 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1404 bms->version = __cpu_to_le32(major);
1405 uuid_from_super1(st, (int*)bms->uuid);
1406 bms->chunksize = __cpu_to_le32(chunk);
1407 bms->daemon_sleep = __cpu_to_le32(delay);
1408 bms->sync_size = __cpu_to_le64(size);
1409 bms->write_behind = __cpu_to_le32(write_behind);
1410
1411 *chunkp = chunk;
1412 return 1;
1413 }
1414
1415
1416 static void locate_bitmap1(struct supertype *st, int fd)
1417 {
1418 unsigned long long offset;
1419 struct mdp_superblock_1 *sb;
1420 int mustfree = 0;
1421
1422 if (!st->sb) {
1423 if (st->ss->load_super(st, fd, NULL))
1424 return; /* no error I hope... */
1425 mustfree = 1;
1426 }
1427 sb = st->sb;
1428
1429 offset = __le64_to_cpu(sb->super_offset);
1430 offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
1431 if (mustfree)
1432 free(sb);
1433 lseek64(fd, offset<<9, 0);
1434 }
1435
1436 static int write_bitmap1(struct supertype *st, int fd)
1437 {
1438 struct mdp_superblock_1 *sb = st->sb;
1439 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1440 int rv = 0;
1441
1442 int towrite, n;
1443 char abuf[4096+512];
1444 char *buf = (char*)(((long)(abuf+512))&~511UL);
1445
1446 locate_bitmap1(st, fd);
1447
1448 memset(buf, 0xff, 4096);
1449 memcpy(buf, ((char*)sb)+1024, sizeof(bitmap_super_t));
1450
1451 towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1452 towrite = (towrite+7) >> 3; /* bits to bytes */
1453 towrite += sizeof(bitmap_super_t);
1454 towrite = ROUND_UP(towrite, 512);
1455 while (towrite > 0) {
1456 n = towrite;
1457 if (n > 4096)
1458 n = 4096;
1459 n = write(fd, buf, n);
1460 if (n > 0)
1461 towrite -= n;
1462 else
1463 break;
1464 memset(buf, 0xff, 4096);
1465 }
1466 fsync(fd);
1467 if (towrite)
1468 rv = -2;
1469
1470 return rv;
1471 }
1472
1473 static void free_super1(struct supertype *st)
1474 {
1475 if (st->sb)
1476 free(st->sb);
1477 st->sb = NULL;
1478 }
1479
1480 #ifndef MDASSEMBLE
1481 static int validate_geometry1(struct supertype *st, int level,
1482 int layout, int raiddisks,
1483 int chunk, unsigned long long size,
1484 char *subdev, unsigned long long *freesize,
1485 int verbose)
1486 {
1487 unsigned long long ldsize;
1488 int fd;
1489
1490 if (level == LEVEL_CONTAINER)
1491 return 0;
1492 if (!subdev)
1493 return 1;
1494
1495 fd = open(subdev, O_RDONLY|O_EXCL, 0);
1496 if (fd < 0) {
1497 if (verbose)
1498 fprintf(stderr, Name ": super1.x cannot open %s: %s\n",
1499 subdev, strerror(errno));
1500 return 0;
1501 }
1502
1503 if (!get_dev_size(fd, subdev, &ldsize)) {
1504 close(fd);
1505 return 0;
1506 }
1507 close(fd);
1508
1509 *freesize = avail_size1(st, ldsize >> 9);
1510 return 1;
1511 }
1512 #endif /* MDASSEMBLE */
1513
1514 struct superswitch super1 = {
1515 #ifndef MDASSEMBLE
1516 .examine_super = examine_super1,
1517 .brief_examine_super = brief_examine_super1,
1518 .export_examine_super = export_examine_super1,
1519 .detail_super = detail_super1,
1520 .brief_detail_super = brief_detail_super1,
1521 .export_detail_super = export_detail_super1,
1522 .write_init_super = write_init_super1,
1523 .validate_geometry = validate_geometry1,
1524 .add_to_super = add_to_super1,
1525 #endif
1526 .match_home = match_home1,
1527 .uuid_from_super = uuid_from_super1,
1528 .getinfo_super = getinfo_super1,
1529 .update_super = update_super1,
1530 .init_super = init_super1,
1531 .store_super = store_super1,
1532 .compare_super = compare_super1,
1533 .load_super = load_super1,
1534 .match_metadata_desc = match_metadata_desc1,
1535 .avail_size = avail_size1,
1536 .add_internal_bitmap = add_internal_bitmap1,
1537 .locate_bitmap = locate_bitmap1,
1538 .write_bitmap = write_bitmap1,
1539 .free_super = free_super1,
1540 #if __BYTE_ORDER == BIG_ENDIAN
1541 .swapuuid = 0,
1542 #else
1543 .swapuuid = 1,
1544 #endif
1545 };
Unnamed repository; edit this file 'description' to name the repository.