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Merge branch 'master' into devel-3.0
[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 = "??";
357
358 printf("ARRAY /dev/md/%s level=%s ", nm, c?c:"-unknown-");
359 sb_offset = __le64_to_cpu(sb->super_offset);
360 if (sb_offset <= 4)
361 printf("metadata=1.1 ");
362 else if (sb_offset <= 8)
363 printf("metadata=1.2 ");
364 else
365 printf("metadata=1.0 ");
366 printf("num-devices=%d UUID=", __le32_to_cpu(sb->raid_disks));
367 for (i=0; i<16; i++) {
368 if ((i&3)==0 && i != 0) printf(":");
369 printf("%02x", sb->set_uuid[i]);
370 }
371 if (sb->set_name[0])
372 printf(" name=%.32s", sb->set_name);
373 printf("\n");
374 }
375
376 static void export_examine_super1(struct supertype *st)
377 {
378 struct mdp_superblock_1 *sb = st->sb;
379 int i;
380 int len = 32;
381
382 printf("MD_LEVEL=%s\n", map_num(pers, __le32_to_cpu(sb->level)));
383 printf("MD_DEVICES=%d\n", __le32_to_cpu(sb->raid_disks));
384 for (i=0; i<32; i++)
385 if (sb->set_name[i] == '\n' ||
386 sb->set_name[i] == '\0') {
387 len = i;
388 break;
389 }
390 if (len)
391 printf("MD_NAME=%.*s\n", len, sb->set_name);
392 printf("MD_UUID=");
393 for (i=0; i<16; i++) {
394 if ((i&3)==0 && i != 0) printf(":");
395 printf("%02x", sb->set_uuid[i]);
396 }
397 printf("\n");
398 printf("MD_UPDATE_TIME=%llu\n",
399 __le64_to_cpu(sb->utime) & 0xFFFFFFFFFFULL);
400 printf("MD_DEV_UUID=");
401 for (i=0; i<16; i++) {
402 if ((i&3)==0 && i != 0) printf(":");
403 printf("%02x", sb->device_uuid[i]);
404 }
405 printf("\n");
406 printf("MD_EVENTS=%llu\n",
407 (unsigned long long)__le64_to_cpu(sb->events));
408 }
409
410 static void detail_super1(struct supertype *st, char *homehost)
411 {
412 struct mdp_superblock_1 *sb = st->sb;
413 int i;
414 int l = homehost ? strlen(homehost) : 0;
415
416 printf(" Name : %.32s", sb->set_name);
417 if (l > 0 && l < 32 &&
418 sb->set_name[l] == ':' &&
419 strncmp(sb->set_name, homehost, l) == 0)
420 printf(" (local to host %s)", homehost);
421 printf("\n UUID : ");
422 for (i=0; i<16; i++) {
423 if ((i&3)==0 && i != 0) printf(":");
424 printf("%02x", sb->set_uuid[i]);
425 }
426 printf("\n Events : %llu\n\n", (unsigned long long)__le64_to_cpu(sb->events));
427 }
428
429 static void brief_detail_super1(struct supertype *st)
430 {
431 struct mdp_superblock_1 *sb = st->sb;
432 int i;
433
434 if (sb->set_name[0])
435 printf(" name=%.32s", sb->set_name);
436 printf(" UUID=");
437 for (i=0; i<16; i++) {
438 if ((i&3)==0 && i != 0) printf(":");
439 printf("%02x", sb->set_uuid[i]);
440 }
441 }
442
443 static void export_detail_super1(struct supertype *st)
444 {
445 struct mdp_superblock_1 *sb = st->sb;
446 int i;
447 int len = 32;
448
449 for (i=0; i<32; i++)
450 if (sb->set_name[i] == '\n' ||
451 sb->set_name[i] == '\0') {
452 len = i;
453 break;
454 }
455 if (len)
456 printf("MD_NAME=%.*s\n", len, sb->set_name);
457 }
458
459 #endif
460
461 static int match_home1(struct supertype *st, char *homehost)
462 {
463 struct mdp_superblock_1 *sb = st->sb;
464 int l = homehost ? strlen(homehost) : 0;
465
466 return (l > 0 && l < 32 &&
467 sb->set_name[l] == ':' &&
468 strncmp(sb->set_name, homehost, l) == 0);
469 }
470
471 static void uuid_from_super1(struct supertype *st, int uuid[4])
472 {
473 struct mdp_superblock_1 *super = st->sb;
474 char *cuuid = (char*)uuid;
475 int i;
476 for (i=0; i<16; i++)
477 cuuid[i] = super->set_uuid[i];
478 }
479
480 static void getinfo_super1(struct supertype *st, struct mdinfo *info)
481 {
482 struct mdp_superblock_1 *sb = st->sb;
483 int working = 0;
484 int i;
485 int role;
486
487 info->array.major_version = 1;
488 info->array.minor_version = st->minor_version;
489 info->array.patch_version = 0;
490 info->array.raid_disks = __le32_to_cpu(sb->raid_disks);
491 info->array.level = __le32_to_cpu(sb->level);
492 info->array.layout = __le32_to_cpu(sb->layout);
493 info->array.md_minor = -1;
494 info->array.ctime = __le64_to_cpu(sb->ctime);
495 info->array.utime = __le64_to_cpu(sb->utime);
496 info->array.chunk_size = __le32_to_cpu(sb->chunksize)*512;
497 info->array.state =
498 (__le64_to_cpu(sb->resync_offset) >= __le64_to_cpu(sb->size))
499 ? 1 : 0;
500
501 info->data_offset = __le64_to_cpu(sb->data_offset);
502 info->component_size = __le64_to_cpu(sb->size);
503
504 info->disk.major = 0;
505 info->disk.minor = 0;
506 info->disk.number = __le32_to_cpu(sb->dev_number);
507 if (__le32_to_cpu(sb->dev_number) >= __le32_to_cpu(sb->max_dev) ||
508 __le32_to_cpu(sb->max_dev) > 512)
509 role = 0xfffe;
510 else
511 role = __le16_to_cpu(sb->dev_roles[__le32_to_cpu(sb->dev_number)]);
512
513 info->disk.raid_disk = -1;
514 switch(role) {
515 case 0xFFFF:
516 info->disk.state = 2; /* spare: ACTIVE, not sync, not faulty */
517 break;
518 case 0xFFFE:
519 info->disk.state = 1; /* faulty */
520 break;
521 default:
522 info->disk.state = 6; /* active and in sync */
523 info->disk.raid_disk = role;
524 }
525 info->events = __le64_to_cpu(sb->events);
526 sprintf(info->text_version, "1.%d", st->minor_version);
527 info->safe_mode_delay = 200;
528
529 memcpy(info->uuid, sb->set_uuid, 16);
530
531 strncpy(info->name, sb->set_name, 32);
532 info->name[32] = 0;
533
534 if (sb->feature_map & __le32_to_cpu(MD_FEATURE_RESHAPE_ACTIVE)) {
535 info->reshape_active = 1;
536 info->reshape_progress = __le64_to_cpu(sb->reshape_position);
537 info->new_level = __le32_to_cpu(sb->new_level);
538 info->delta_disks = __le32_to_cpu(sb->delta_disks);
539 info->new_layout = __le32_to_cpu(sb->new_layout);
540 info->new_chunk = __le32_to_cpu(sb->new_chunk)<<9;
541 } else
542 info->reshape_active = 0;
543
544 for (i=0; i< __le32_to_cpu(sb->max_dev); i++) {
545 role = __le16_to_cpu(sb->dev_roles[i]);
546 if (/*role == 0xFFFF || */role < info->array.raid_disks)
547 working++;
548 }
549
550 info->array.working_disks = working;
551 }
552
553 static int update_super1(struct supertype *st, struct mdinfo *info,
554 char *update,
555 char *devname, int verbose,
556 int uuid_set, char *homehost)
557 {
558 /* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
559 * For others, the return value is ignored.
560 */
561 int rv = 0;
562 struct mdp_superblock_1 *sb = st->sb;
563
564 if (strcmp(update, "force-one")==0) {
565 /* Not enough devices for a working array,
566 * so bring this one up-to-date
567 */
568 if (sb->events != __cpu_to_le64(info->events))
569 rv = 1;
570 sb->events = __cpu_to_le64(info->events);
571 }
572 if (strcmp(update, "force-array")==0) {
573 /* Degraded array and 'force' requests to
574 * maybe need to mark it 'clean'.
575 */
576 switch(__le32_to_cpu(sb->level)) {
577 case 5: case 4: case 6:
578 /* need to force clean */
579 if (sb->resync_offset != ~0ULL)
580 rv = 1;
581 sb->resync_offset = ~0ULL;
582 }
583 }
584 if (strcmp(update, "assemble")==0) {
585 int d = info->disk.number;
586 int want;
587 if (info->disk.state == 6)
588 want = __cpu_to_le32(info->disk.raid_disk);
589 else
590 want = 0xFFFF;
591 if (sb->dev_roles[d] != want) {
592 sb->dev_roles[d] = want;
593 rv = 1;
594 }
595 }
596 if (strcmp(update, "linear-grow-new") == 0) {
597 int i;
598 int rfd, fd;
599 int max = __le32_to_cpu(sb->max_dev);
600
601 for (i=0 ; i < max ; i++)
602 if (__le16_to_cpu(sb->dev_roles[i]) >= 0xfffe)
603 break;
604 sb->dev_number = __cpu_to_le32(i);
605 info->disk.number = i;
606 if (max >= __le32_to_cpu(sb->max_dev))
607 sb->max_dev = __cpu_to_le32(max+1);
608
609 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
610 read(rfd, sb->device_uuid, 16) != 16) {
611 *(__u32*)(sb->device_uuid) = random();
612 *(__u32*)(sb->device_uuid+4) = random();
613 *(__u32*)(sb->device_uuid+8) = random();
614 *(__u32*)(sb->device_uuid+12) = random();
615 }
616
617 sb->dev_roles[i] =
618 __cpu_to_le16(info->disk.raid_disk);
619
620 fd = open(devname, O_RDONLY);
621 if (fd >= 0) {
622 unsigned long long ds;
623 get_dev_size(fd, devname, &ds);
624 close(fd);
625 ds >>= 9;
626 if (__le64_to_cpu(sb->super_offset) <
627 __le64_to_cpu(sb->data_offset)) {
628 sb->data_size = __cpu_to_le64(
629 ds - __le64_to_cpu(sb->data_offset));
630 } else {
631 ds -= 8*2;
632 ds &= ~(unsigned long long)(4*2-1);
633 sb->super_offset = __cpu_to_le64(ds);
634 sb->data_size = __cpu_to_le64(
635 ds - __le64_to_cpu(sb->data_offset));
636 }
637 }
638 }
639 if (strcmp(update, "linear-grow-update") == 0) {
640 sb->raid_disks = __cpu_to_le32(info->array.raid_disks);
641 sb->dev_roles[info->disk.number] =
642 __cpu_to_le16(info->disk.raid_disk);
643 }
644 if (strcmp(update, "resync") == 0) {
645 /* make sure resync happens */
646 sb->resync_offset = 0ULL;
647 }
648 if (strcmp(update, "uuid") == 0) {
649 copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);
650
651 if (__le32_to_cpu(sb->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
652 struct bitmap_super_s *bm;
653 bm = (struct bitmap_super_s*)(st->sb+1024);
654 memcpy(bm->uuid, sb->set_uuid, 16);
655 }
656 }
657 if (strcmp(update, "homehost") == 0 &&
658 homehost) {
659 char *c;
660 update = "name";
661 c = strchr(sb->set_name, ':');
662 if (c)
663 strncpy(info->name, c+1, 31 - (c-sb->set_name));
664 else
665 strncpy(info->name, sb->set_name, 32);
666 info->name[32] = 0;
667 }
668 if (strcmp(update, "name") == 0) {
669 if (info->name[0] == 0)
670 sprintf(info->name, "%d", info->array.md_minor);
671 memset(sb->set_name, 0, sizeof(sb->set_name));
672 if (homehost &&
673 strchr(info->name, ':') == NULL &&
674 strlen(homehost)+1+strlen(info->name) < 32) {
675 strcpy(sb->set_name, homehost);
676 strcat(sb->set_name, ":");
677 strcat(sb->set_name, info->name);
678 } else
679 strcpy(sb->set_name, info->name);
680 }
681 if (strcmp(update, "devicesize") == 0 &&
682 __le64_to_cpu(sb->super_offset) <
683 __le64_to_cpu(sb->data_offset)) {
684 /* set data_size to device size less data_offset */
685 struct misc_dev_info *misc = (struct misc_dev_info*)
686 (st->sb + 1024 + 512);
687 printf("Size was %llu\n", (unsigned long long)
688 __le64_to_cpu(sb->data_size));
689 sb->data_size = __cpu_to_le64(
690 misc->device_size - __le64_to_cpu(sb->data_offset));
691 printf("Size is %llu\n", (unsigned long long)
692 __le64_to_cpu(sb->data_size));
693 }
694 if (strcmp(update, "_reshape_progress")==0)
695 sb->reshape_position = __cpu_to_le64(info->reshape_progress);
696
697 sb->sb_csum = calc_sb_1_csum(sb);
698 return rv;
699 }
700
701 static int init_super1(struct supertype *st, mdu_array_info_t *info,
702 unsigned long long size, char *name, char *homehost, int *uuid)
703 {
704 struct mdp_superblock_1 *sb;
705 int spares;
706 int rfd;
707 char defname[10];
708
709 if (posix_memalign((void**)&sb, 512, (1024 + 512 +
710 sizeof(struct misc_dev_info))) != 0) {
711 fprintf(stderr, Name
712 ": %s could not allocate superblock\n", __func__);
713 return 0;
714 }
715 memset(sb, 0, 1024);
716
717 st->sb = sb;
718 if (info == NULL) {
719 /* zeroing superblock */
720 return 0;
721 }
722
723 spares = info->working_disks - info->active_disks;
724 if (info->raid_disks + spares > 384) {
725 fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
726 info->raid_disks , spares, 384);
727 return 0;
728 }
729
730 sb->magic = __cpu_to_le32(MD_SB_MAGIC);
731 sb->major_version = __cpu_to_le32(1);
732 sb->feature_map = 0;
733 sb->pad0 = 0;
734
735 if (uuid)
736 copy_uuid(sb->set_uuid, uuid, super1.swapuuid);
737 else {
738 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
739 read(rfd, sb->set_uuid, 16) != 16) {
740 *(__u32*)(sb->set_uuid) = random();
741 *(__u32*)(sb->set_uuid+4) = random();
742 *(__u32*)(sb->set_uuid+8) = random();
743 *(__u32*)(sb->set_uuid+12) = random();
744 }
745 if (rfd >= 0) close(rfd);
746 }
747
748 if (name == NULL || *name == 0) {
749 sprintf(defname, "%d", info->md_minor);
750 name = defname;
751 }
752 memset(sb->set_name, 0, 32);
753 if (homehost &&
754 strchr(name, ':')== NULL &&
755 strlen(homehost)+1+strlen(name) < 32) {
756 strcpy(sb->set_name, homehost);
757 strcat(sb->set_name, ":");
758 strcat(sb->set_name, name);
759 } else
760 strcpy(sb->set_name, name);
761
762 sb->ctime = __cpu_to_le64((unsigned long long)time(0));
763 sb->level = __cpu_to_le32(info->level);
764 sb->layout = __cpu_to_le32(info->layout);
765 sb->size = __cpu_to_le64(size*2ULL);
766 sb->chunksize = __cpu_to_le32(info->chunk_size>>9);
767 sb->raid_disks = __cpu_to_le32(info->raid_disks);
768
769 sb->data_offset = __cpu_to_le64(0);
770 sb->data_size = __cpu_to_le64(0);
771 sb->super_offset = __cpu_to_le64(0);
772 sb->recovery_offset = __cpu_to_le64(0);
773
774 sb->utime = sb->ctime;
775 sb->events = __cpu_to_le64(1);
776 if (info->state & (1<<MD_SB_CLEAN))
777 sb->resync_offset = ~0ULL;
778 else
779 sb->resync_offset = 0;
780 sb->max_dev = __cpu_to_le32((1024- sizeof(struct mdp_superblock_1))/
781 sizeof(sb->dev_roles[0]));
782 memset(sb->pad3, 0, sizeof(sb->pad3));
783
784 memset(sb->dev_roles, 0xff, 1024 - sizeof(struct mdp_superblock_1));
785
786 return 1;
787 }
788
789 struct devinfo {
790 int fd;
791 char *devname;
792 mdu_disk_info_t disk;
793 struct devinfo *next;
794 };
795 #ifndef MDASSEMBLE
796 /* Add a device to the superblock being created */
797 static void add_to_super1(struct supertype *st, mdu_disk_info_t *dk,
798 int fd, char *devname)
799 {
800 struct mdp_superblock_1 *sb = st->sb;
801 __u16 *rp = sb->dev_roles + dk->number;
802 struct devinfo *di, **dip;
803
804 if ((dk->state & 6) == 6) /* active, sync */
805 *rp = __cpu_to_le16(dk->raid_disk);
806 else if ((dk->state & ~2) == 0) /* active or idle -> spare */
807 *rp = 0xffff;
808 else
809 *rp = 0xfffe;
810
811 sb->dev_number = __cpu_to_le32(dk->number);
812 sb->sb_csum = calc_sb_1_csum(sb);
813
814 dip = (struct devinfo **)&st->info;
815 while (*dip)
816 dip = &(*dip)->next;
817 di = malloc(sizeof(struct devinfo));
818 di->fd = fd;
819 di->devname = devname;
820 di->disk = *dk;
821 di->next = NULL;
822 *dip = di;
823 }
824 #endif
825
826 static void locate_bitmap1(struct supertype *st, int fd);
827
828 static int store_super1(struct supertype *st, int fd)
829 {
830 struct mdp_superblock_1 *sb = st->sb;
831 unsigned long long sb_offset;
832 int sbsize;
833 unsigned long long dsize;
834
835 if (!get_dev_size(fd, NULL, &dsize))
836 return 1;
837
838 dsize >>= 9;
839
840 if (dsize < 24)
841 return 2;
842
843 /*
844 * Calculate the position of the superblock.
845 * It is always aligned to a 4K boundary and
846 * depending on minor_version, it can be:
847 * 0: At least 8K, but less than 12K, from end of device
848 * 1: At start of device
849 * 2: 4K from start of device.
850 */
851 switch(st->minor_version) {
852 case 0:
853 sb_offset = dsize;
854 sb_offset -= 8*2;
855 sb_offset &= ~(4*2-1);
856 break;
857 case 1:
858 sb_offset = 0;
859 break;
860 case 2:
861 sb_offset = 4*2;
862 break;
863 default:
864 return -EINVAL;
865 }
866
867
868
869 if (sb_offset != __le64_to_cpu(sb->super_offset) &&
870 0 != __le64_to_cpu(sb->super_offset)
871 ) {
872 fprintf(stderr, Name ": internal error - sb_offset is wrong\n");
873 abort();
874 }
875
876 if (lseek64(fd, sb_offset << 9, 0)< 0LL)
877 return 3;
878
879 sbsize = sizeof(*sb) + 2 * __le32_to_cpu(sb->max_dev);
880 sbsize = (sbsize+511)&(~511UL);
881
882 if (write(fd, sb, sbsize) != sbsize)
883 return 4;
884
885 if (sb->feature_map & __cpu_to_le32(MD_FEATURE_BITMAP_OFFSET)) {
886 struct bitmap_super_s *bm = (struct bitmap_super_s*)
887 (((char*)sb)+1024);
888 if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC) {
889 locate_bitmap1(st, fd);
890 if (write(fd, bm, ROUND_UP(sizeof(*bm),512)) !=
891 ROUND_UP(sizeof(*bm),512))
892 return 5;
893 }
894 }
895 fsync(fd);
896 return 0;
897 }
898
899 static int load_super1(struct supertype *st, int fd, char *devname);
900
901 static unsigned long choose_bm_space(unsigned long devsize)
902 {
903 /* if the device is bigger than 8Gig, save 64k for bitmap usage,
904 * if bigger than 200Gig, save 128k
905 */
906 if (devsize < 64*2) return 0;
907 if (devsize - 64*2 >= 200*1024*1024*2)
908 return 128*2;
909 if (devsize - 4*2 > 8*1024*1024*2)
910 return 64*2;
911 return 4*2;
912 }
913
914 #ifndef MDASSEMBLE
915 static int write_init_super1(struct supertype *st)
916 {
917 struct mdp_superblock_1 *sb = st->sb;
918 struct supertype refst;
919 int rfd;
920 int rv = 0;
921 int bm_space;
922 struct devinfo *di;
923 unsigned long long dsize, array_size;
924 long long sb_offset;
925
926 for (di = st->info; di && ! rv ; di = di->next) {
927 if (di->disk.state == 1)
928 continue;
929 if (di->fd < 0)
930 continue;
931
932 Kill(di->devname, 0, 1, 1);
933 Kill(di->devname, 0, 1, 1);
934
935 sb->dev_number = __cpu_to_le32(di->disk.number);
936 if (di->disk.state & (1<<MD_DISK_WRITEMOSTLY))
937 sb->devflags |= __cpu_to_le32(WriteMostly1);
938
939 if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 ||
940 read(rfd, sb->device_uuid, 16) != 16) {
941 *(__u32*)(sb->device_uuid) = random();
942 *(__u32*)(sb->device_uuid+4) = random();
943 *(__u32*)(sb->device_uuid+8) = random();
944 *(__u32*)(sb->device_uuid+12) = random();
945 }
946 if (rfd >= 0) close(rfd);
947 sb->events = 0;
948
949 refst =*st;
950 refst.sb = NULL;
951 if (load_super1(&refst, di->fd, NULL)==0) {
952 struct mdp_superblock_1 *refsb = refst.sb;
953
954 memcpy(sb->device_uuid, refsb->device_uuid, 16);
955 if (memcmp(sb->set_uuid, refsb->set_uuid, 16)==0) {
956 /* same array, so preserve events and
957 * dev_number */
958 sb->events = refsb->events;
959 /* bugs in 2.6.17 and earlier mean the
960 * dev_number chosen in Manage must be preserved
961 */
962 if (get_linux_version() >= 2006018)
963 sb->dev_number = refsb->dev_number;
964 }
965 free(refsb);
966 }
967
968 if (!get_dev_size(di->fd, NULL, &dsize))
969 return 1;
970 dsize >>= 9;
971
972 if (dsize < 24) {
973 close(di->fd);
974 return 2;
975 }
976
977
978 /*
979 * Calculate the position of the superblock.
980 * It is always aligned to a 4K boundary and
981 * depending on minor_version, it can be:
982 * 0: At least 8K, but less than 12K, from end of device
983 * 1: At start of device
984 * 2: 4K from start of device.
985 * Depending on the array size, we might leave extra space
986 * for a bitmap.
987 */
988 array_size = __le64_to_cpu(sb->size);
989 /* work out how much space we left for a bitmap */
990 bm_space = choose_bm_space(array_size);
991
992 switch(st->minor_version) {
993 case 0:
994 sb_offset = dsize;
995 sb_offset -= 8*2;
996 sb_offset &= ~(4*2-1);
997 sb->super_offset = __cpu_to_le64(sb_offset);
998 sb->data_offset = __cpu_to_le64(0);
999 if (sb_offset - bm_space < array_size)
1000 bm_space = sb_offset - array_size;
1001 sb->data_size = __cpu_to_le64(sb_offset - bm_space);
1002 break;
1003 case 1:
1004 sb->super_offset = __cpu_to_le64(0);
1005 if (4*2 + bm_space + __le64_to_cpu(sb->size) > dsize)
1006 bm_space = dsize - __le64_to_cpu(sb->size) -4*2;
1007 sb->data_offset = __cpu_to_le64(bm_space + 4*2);
1008 sb->data_size = __cpu_to_le64(dsize - bm_space - 4*2);
1009 break;
1010 case 2:
1011 sb_offset = 4*2;
1012 sb->super_offset = __cpu_to_le64(4*2);
1013 if (4*2 + 4*2 + bm_space + __le64_to_cpu(sb->size)
1014 > dsize)
1015 bm_space = dsize - __le64_to_cpu(sb->size)
1016 - 4*2 - 4*2;
1017 sb->data_offset = __cpu_to_le64(4*2 + 4*2 + bm_space);
1018 sb->data_size = __cpu_to_le64(dsize - 4*2 - 4*2
1019 - bm_space );
1020 break;
1021 default:
1022 return -EINVAL;
1023 }
1024
1025
1026 sb->sb_csum = calc_sb_1_csum(sb);
1027 rv = store_super1(st, di->fd);
1028 if (rv)
1029 fprintf(stderr,
1030 Name ": failed to write superblock to %s\n",
1031 di->devname);
1032
1033 if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
1034 rv = st->ss->write_bitmap(st, di->fd);
1035 close(di->fd);
1036 di->fd = -1;
1037 }
1038 return rv;
1039 }
1040 #endif
1041
1042 static int compare_super1(struct supertype *st, struct supertype *tst)
1043 {
1044 /*
1045 * return:
1046 * 0 same, or first was empty, and second was copied
1047 * 1 second had wrong number
1048 * 2 wrong uuid
1049 * 3 wrong other info
1050 */
1051 struct mdp_superblock_1 *first = st->sb;
1052 struct mdp_superblock_1 *second = tst->sb;
1053
1054 if (second->magic != __cpu_to_le32(MD_SB_MAGIC))
1055 return 1;
1056 if (second->major_version != __cpu_to_le32(1))
1057 return 1;
1058
1059 if (!first) {
1060 if (posix_memalign((void**)&first, 512,
1061 1024 + 512 +
1062 sizeof(struct misc_dev_info)) != 0) {
1063 fprintf(stderr, Name
1064 ": %s could not allocate superblock\n", __func__);
1065 return 1;
1066 }
1067 memcpy(first, second, 1024 + 512 +
1068 sizeof(struct misc_dev_info));
1069 st->sb = first;
1070 return 0;
1071 }
1072 if (memcmp(first->set_uuid, second->set_uuid, 16)!= 0)
1073 return 2;
1074
1075 if (first->ctime != second->ctime ||
1076 first->level != second->level ||
1077 first->layout != second->layout ||
1078 first->size != second->size ||
1079 first->chunksize != second->chunksize ||
1080 first->raid_disks != second->raid_disks)
1081 return 3;
1082 return 0;
1083 }
1084
1085 static void free_super1(struct supertype *st);
1086
1087 static int load_super1(struct supertype *st, int fd, char *devname)
1088 {
1089 unsigned long long dsize;
1090 unsigned long long sb_offset;
1091 struct mdp_superblock_1 *super;
1092 int uuid[4];
1093 struct bitmap_super_s *bsb;
1094 struct misc_dev_info *misc;
1095
1096 free_super1(st);
1097
1098 if (st->subarray[0])
1099 return 1;
1100
1101 if (st->ss == NULL || st->minor_version == -1) {
1102 int bestvers = -1;
1103 struct supertype tst;
1104 __u64 bestctime = 0;
1105 /* guess... choose latest ctime */
1106 memset(&tst, 0, sizeof(tst));
1107 tst.ss = &super1;
1108 for (tst.minor_version = 0; tst.minor_version <= 2 ; tst.minor_version++) {
1109 switch(load_super1(&tst, fd, devname)) {
1110 case 0: super = tst.sb;
1111 if (bestvers == -1 ||
1112 bestctime < __le64_to_cpu(super->ctime)) {
1113 bestvers = tst.minor_version;
1114 bestctime = __le64_to_cpu(super->ctime);
1115 }
1116 free(super);
1117 tst.sb = NULL;
1118 break;
1119 case 1: return 1; /*bad device */
1120 case 2: break; /* bad, try next */
1121 }
1122 }
1123 if (bestvers != -1) {
1124 int rv;
1125 tst.minor_version = bestvers;
1126 tst.ss = &super1;
1127 tst.max_devs = 384;
1128 rv = load_super1(&tst, fd, devname);
1129 if (rv == 0)
1130 *st = tst;
1131 return rv;
1132 }
1133 return 2;
1134 }
1135 if (!get_dev_size(fd, devname, &dsize))
1136 return 1;
1137 dsize >>= 9;
1138
1139 if (dsize < 24) {
1140 if (devname)
1141 fprintf(stderr, Name ": %s is too small for md: size is %llu sectors.\n",
1142 devname, dsize);
1143 return 1;
1144 }
1145
1146 /*
1147 * Calculate the position of the superblock.
1148 * It is always aligned to a 4K boundary and
1149 * depending on minor_version, it can be:
1150 * 0: At least 8K, but less than 12K, from end of device
1151 * 1: At start of device
1152 * 2: 4K from start of device.
1153 */
1154 switch(st->minor_version) {
1155 case 0:
1156 sb_offset = dsize;
1157 sb_offset -= 8*2;
1158 sb_offset &= ~(4*2-1);
1159 break;
1160 case 1:
1161 sb_offset = 0;
1162 break;
1163 case 2:
1164 sb_offset = 4*2;
1165 break;
1166 default:
1167 return -EINVAL;
1168 }
1169
1170 ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
1171
1172
1173 if (lseek64(fd, sb_offset << 9, 0)< 0LL) {
1174 if (devname)
1175 fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
1176 devname, strerror(errno));
1177 return 1;
1178 }
1179
1180 if (posix_memalign((void**)&super, 512,
1181 1024 + 512 +
1182 sizeof(struct misc_dev_info)) != 0) {
1183 fprintf(stderr, Name ": %s could not allocate superblock\n",
1184 __func__);
1185 return 1;
1186 }
1187
1188 if (read(fd, super, 1024) != 1024) {
1189 if (devname)
1190 fprintf(stderr, Name ": Cannot read superblock on %s\n",
1191 devname);
1192 free(super);
1193 return 1;
1194 }
1195
1196 if (__le32_to_cpu(super->magic) != MD_SB_MAGIC) {
1197 if (devname)
1198 fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
1199 devname, MD_SB_MAGIC, __le32_to_cpu(super->magic));
1200 free(super);
1201 return 2;
1202 }
1203
1204 if (__le32_to_cpu(super->major_version) != 1) {
1205 if (devname)
1206 fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
1207 devname, __le32_to_cpu(super->major_version));
1208 free(super);
1209 return 2;
1210 }
1211 if (__le64_to_cpu(super->super_offset) != sb_offset) {
1212 if (devname)
1213 fprintf(stderr, Name ": No superblock found on %s (super_offset is wrong)\n",
1214 devname);
1215 free(super);
1216 return 2;
1217 }
1218 st->sb = super;
1219
1220 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1221
1222 misc = (struct misc_dev_info*) (((char*)super)+1024+512);
1223 misc->device_size = dsize;
1224
1225 /* Now check on the bitmap superblock */
1226 if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
1227 return 0;
1228 /* Read the bitmap superblock and make sure it looks
1229 * valid. If it doesn't clear the bit. An --assemble --force
1230 * should get that written out.
1231 */
1232 locate_bitmap1(st, fd);
1233 if (read(fd, ((char*)super)+1024, 512)
1234 != 512)
1235 goto no_bitmap;
1236
1237 uuid_from_super1(st, uuid);
1238 if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
1239 memcmp(bsb->uuid, uuid, 16) != 0)
1240 goto no_bitmap;
1241 return 0;
1242
1243 no_bitmap:
1244 super->feature_map = __cpu_to_le32(__le32_to_cpu(super->feature_map) & ~1);
1245 return 0;
1246 }
1247
1248
1249 static struct supertype *match_metadata_desc1(char *arg)
1250 {
1251 struct supertype *st = malloc(sizeof(*st));
1252 if (!st) return st;
1253
1254 memset(st, 0, sizeof(*st));
1255 st->ss = &super1;
1256 st->max_devs = 384;
1257 st->sb = NULL;
1258 /* leading zeros can be safely ignored. --detail generates them. */
1259 while (*arg == '0')
1260 arg++;
1261 if (strcmp(arg, "1.0") == 0 ||
1262 strcmp(arg, "1.00") == 0) {
1263 st->minor_version = 0;
1264 return st;
1265 }
1266 if (strcmp(arg, "1.1") == 0 ||
1267 strcmp(arg, "1.01") == 0) {
1268 st->minor_version = 1;
1269 return st;
1270 }
1271 if (strcmp(arg, "1.2") == 0 ||
1272 strcmp(arg, "1.02") == 0) {
1273 st->minor_version = 2;
1274 return st;
1275 }
1276 if (strcmp(arg, "1") == 0 ||
1277 strcmp(arg, "default") == 0) {
1278 st->minor_version = -1;
1279 return st;
1280 }
1281
1282 free(st);
1283 return NULL;
1284 }
1285
1286 /* find available size on device with this devsize, using
1287 * superblock type st, and reserving 'reserve' sectors for
1288 * a possible bitmap
1289 */
1290 static __u64 avail_size1(struct supertype *st, __u64 devsize)
1291 {
1292 struct mdp_superblock_1 *super = st->sb;
1293 if (devsize < 24)
1294 return 0;
1295
1296 if (super == NULL)
1297 /* creating: allow suitable space for bitmap */
1298 devsize -= choose_bm_space(devsize);
1299 #ifndef MDASSEMBLE
1300 else if (__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) {
1301 /* hot-add. allow for actual size of bitmap */
1302 struct bitmap_super_s *bsb;
1303 bsb = (struct bitmap_super_s *)(((char*)super)+1024);
1304 devsize -= bitmap_sectors(bsb);
1305 }
1306 #endif
1307
1308 switch(st->minor_version) {
1309 case -1: /* no specified. Now time to set default */
1310 st->minor_version = 0;
1311 /* FALL THROUGH */
1312 case 0:
1313 /* at end */
1314 return ((devsize - 8*2 ) & ~(4*2-1));
1315 case 1:
1316 /* at start, 4K for superblock and possible bitmap */
1317 return devsize - 4*2;
1318 case 2:
1319 /* 4k from start, 4K for superblock and possible bitmap */
1320 return devsize - (4+4)*2;
1321 }
1322 return 0;
1323 }
1324
1325 static int
1326 add_internal_bitmap1(struct supertype *st,
1327 int *chunkp, int delay, int write_behind,
1328 unsigned long long size,
1329 int may_change, int major)
1330 {
1331 /*
1332 * If not may_change, then this is a 'Grow', and the bitmap
1333 * must fit after the superblock.
1334 * If may_change, then this is create, and we can put the bitmap
1335 * before the superblock if we like, or may move the start.
1336 * If !may_change, the bitmap MUST live at offset of 1K, until
1337 * we get a sysfs interface.
1338 *
1339 * size is in sectors, chunk is in bytes !!!
1340 */
1341
1342 unsigned long long bits;
1343 unsigned long long max_bits;
1344 unsigned long long min_chunk;
1345 long offset;
1346 int chunk = *chunkp;
1347 int room = 0;
1348 struct mdp_superblock_1 *sb = st->sb;
1349 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + 1024);
1350
1351 switch(st->minor_version) {
1352 case 0:
1353 /* either 3K after the superblock, or some amount of space
1354 * before.
1355 */
1356 if (may_change) {
1357 /* We are creating array, so we *know* how much room has
1358 * been left.
1359 */
1360 offset = 0;
1361 room = choose_bm_space(__le64_to_cpu(sb->size));
1362 if (room == 4*2) {
1363 /* make it 3K after the superblock */
1364 room = 3*2;
1365 offset = 2;
1366 }
1367 } else {
1368 room = __le64_to_cpu(sb->super_offset)
1369 - __le64_to_cpu(sb->data_offset)
1370 - __le64_to_cpu(sb->data_size);
1371 /* remove '1 ||' when we can set offset via sysfs */
1372 if (1 || (room < 3*2 &&
1373 __le32_to_cpu(sb->max_dev) <= 384)) {
1374 room = 3*2;
1375 offset = 1*2;
1376 } else {
1377 offset = 0; /* means movable offset */
1378 }
1379 }
1380 break;
1381 case 1:
1382 case 2: /* between superblock and data */
1383 if (may_change) {
1384 offset = 4*2;
1385 room = choose_bm_space(__le64_to_cpu(sb->size));
1386 } else {
1387 room = __le64_to_cpu(sb->data_offset)
1388 - __le64_to_cpu(sb->super_offset);
1389 if (1 || __le32_to_cpu(sb->max_dev) <= 384) {
1390 room -= 2;
1391 offset = 2;
1392 } else {
1393 room -= 4*2;
1394 offset = 4*2;
1395 }
1396 }
1397 break;
1398 default:
1399 return 0;
1400 }
1401
1402 if (chunk == UnSet && room > 128*2)
1403 /* Limit to 128K of bitmap when chunk size not requested */
1404 room = 128*2;
1405
1406 max_bits = (room * 512 - sizeof(bitmap_super_t)) * 8;
1407
1408 min_chunk = 4096; /* sub-page chunks don't work yet.. */
1409 bits = (size*512)/min_chunk +1;
1410 while (bits > max_bits) {
1411 min_chunk *= 2;
1412 bits = (bits+1)/2;
1413 }
1414 if (chunk == UnSet)
1415 chunk = min_chunk;
1416 else if (chunk < min_chunk)
1417 return 0; /* chunk size too small */
1418 if (chunk == 0) /* rounding problem */
1419 return 0;
1420
1421 if (offset == 0) {
1422 bits = (size*512) / chunk + 1;
1423 room = ((bits+7)/8 + sizeof(bitmap_super_t) +511)/512;
1424 offset = -room;
1425 }
1426
1427 sb->bitmap_offset = __cpu_to_le32(offset);
1428
1429 sb->feature_map = __cpu_to_le32(__le32_to_cpu(sb->feature_map) | 1);
1430 memset(bms, 0, sizeof(*bms));
1431 bms->magic = __cpu_to_le32(BITMAP_MAGIC);
1432 bms->version = __cpu_to_le32(major);
1433 uuid_from_super1(st, (int*)bms->uuid);
1434 bms->chunksize = __cpu_to_le32(chunk);
1435 bms->daemon_sleep = __cpu_to_le32(delay);
1436 bms->sync_size = __cpu_to_le64(size);
1437 bms->write_behind = __cpu_to_le32(write_behind);
1438
1439 *chunkp = chunk;
1440 return 1;
1441 }
1442
1443
1444 static void locate_bitmap1(struct supertype *st, int fd)
1445 {
1446 unsigned long long offset;
1447 struct mdp_superblock_1 *sb;
1448 int mustfree = 0;
1449
1450 if (!st->sb) {
1451 if (st->ss->load_super(st, fd, NULL))
1452 return; /* no error I hope... */
1453 mustfree = 1;
1454 }
1455 sb = st->sb;
1456
1457 offset = __le64_to_cpu(sb->super_offset);
1458 offset += (int32_t) __le32_to_cpu(sb->bitmap_offset);
1459 if (mustfree)
1460 free(sb);
1461 lseek64(fd, offset<<9, 0);
1462 }
1463
1464 static int write_bitmap1(struct supertype *st, int fd)
1465 {
1466 struct mdp_superblock_1 *sb = st->sb;
1467 bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+1024);
1468 int rv = 0;
1469
1470 int towrite, n;
1471 char abuf[4096+512];
1472 char *buf = (char*)(((long)(abuf+512))&~511UL);
1473
1474 locate_bitmap1(st, fd);
1475
1476 memset(buf, 0xff, 4096);
1477 memcpy(buf, ((char*)sb)+1024, sizeof(bitmap_super_t));
1478
1479 towrite = __le64_to_cpu(bms->sync_size) / (__le32_to_cpu(bms->chunksize)>>9);
1480 towrite = (towrite+7) >> 3; /* bits to bytes */
1481 towrite += sizeof(bitmap_super_t);
1482 towrite = ROUND_UP(towrite, 512);
1483 while (towrite > 0) {
1484 n = towrite;
1485 if (n > 4096)
1486 n = 4096;
1487 n = write(fd, buf, n);
1488 if (n > 0)
1489 towrite -= n;
1490 else
1491 break;
1492 memset(buf, 0xff, 4096);
1493 }
1494 fsync(fd);
1495 if (towrite)
1496 rv = -2;
1497
1498 return rv;
1499 }
1500
1501 static void free_super1(struct supertype *st)
1502 {
1503 if (st->sb)
1504 free(st->sb);
1505 st->sb = NULL;
1506 }
1507
1508 #ifndef MDASSEMBLE
1509 static int validate_geometry1(struct supertype *st, int level,
1510 int layout, int raiddisks,
1511 int chunk, unsigned long long size,
1512 char *subdev, unsigned long long *freesize,
1513 int verbose)
1514 {
1515 unsigned long long ldsize;
1516 int fd;
1517
1518 if (level == LEVEL_CONTAINER)
1519 return 0;
1520 if (!subdev)
1521 return 1;
1522
1523 fd = open(subdev, O_RDONLY|O_EXCL, 0);
1524 if (fd < 0) {
1525 if (verbose)
1526 fprintf(stderr, Name ": super1.x cannot open %s: %s\n",
1527 subdev, strerror(errno));
1528 return 0;
1529 }
1530
1531 if (!get_dev_size(fd, subdev, &ldsize)) {
1532 close(fd);
1533 return 0;
1534 }
1535 close(fd);
1536
1537 *freesize = avail_size1(st, ldsize >> 9);
1538 return 1;
1539 }
1540 #endif /* MDASSEMBLE */
1541
1542 struct superswitch super1 = {
1543 #ifndef MDASSEMBLE
1544 .examine_super = examine_super1,
1545 .brief_examine_super = brief_examine_super1,
1546 .export_examine_super = export_examine_super1,
1547 .detail_super = detail_super1,
1548 .brief_detail_super = brief_detail_super1,
1549 .export_detail_super = export_detail_super1,
1550 .write_init_super = write_init_super1,
1551 .validate_geometry = validate_geometry1,
1552 .add_to_super = add_to_super1,
1553 #endif
1554 .match_home = match_home1,
1555 .uuid_from_super = uuid_from_super1,
1556 .getinfo_super = getinfo_super1,
1557 .update_super = update_super1,
1558 .init_super = init_super1,
1559 .store_super = store_super1,
1560 .compare_super = compare_super1,
1561 .load_super = load_super1,
1562 .match_metadata_desc = match_metadata_desc1,
1563 .avail_size = avail_size1,
1564 .add_internal_bitmap = add_internal_bitmap1,
1565 .locate_bitmap = locate_bitmap1,
1566 .write_bitmap = write_bitmap1,
1567 .free_super = free_super1,
1568 #if __BYTE_ORDER == BIG_ENDIAN
1569 .swapuuid = 0,
1570 #else
1571 .swapuuid = 1,
1572 #endif
1573 };
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