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1 | /* | |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de> | |
5 | * | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * Author: Neil Brown | |
22 | * Email: <neilb@suse.de> | |
23 | */ | |
24 | ||
25 | #include "mdadm.h" | |
26 | #include "md_p.h" | |
27 | #include <sys/socket.h> | |
28 | #include <sys/utsname.h> | |
29 | #include <sys/wait.h> | |
30 | #include <sys/un.h> | |
31 | #include <ctype.h> | |
32 | #include <dirent.h> | |
33 | #include <signal.h> | |
34 | ||
35 | int __offroot; | |
36 | ||
37 | /* | |
38 | * following taken from linux/blkpg.h because they aren't | |
39 | * anywhere else and it isn't safe to #include linux/ * stuff. | |
40 | */ | |
41 | ||
42 | #define BLKPG _IO(0x12,105) | |
43 | ||
44 | /* The argument structure */ | |
45 | struct blkpg_ioctl_arg { | |
46 | int op; | |
47 | int flags; | |
48 | int datalen; | |
49 | void *data; | |
50 | }; | |
51 | ||
52 | /* The subfunctions (for the op field) */ | |
53 | #define BLKPG_ADD_PARTITION 1 | |
54 | #define BLKPG_DEL_PARTITION 2 | |
55 | ||
56 | /* Sizes of name fields. Unused at present. */ | |
57 | #define BLKPG_DEVNAMELTH 64 | |
58 | #define BLKPG_VOLNAMELTH 64 | |
59 | ||
60 | /* The data structure for ADD_PARTITION and DEL_PARTITION */ | |
61 | struct blkpg_partition { | |
62 | long long start; /* starting offset in bytes */ | |
63 | long long length; /* length in bytes */ | |
64 | int pno; /* partition number */ | |
65 | char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2, | |
66 | to be used in kernel messages */ | |
67 | char volname[BLKPG_VOLNAMELTH]; /* volume label */ | |
68 | }; | |
69 | ||
70 | #include "part.h" | |
71 | ||
72 | /* Force a compilation error if condition is true */ | |
73 | #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) | |
74 | ||
75 | /* Force a compilation error if condition is true, but also produce a | |
76 | result (of value 0 and type size_t), so the expression can be used | |
77 | e.g. in a structure initializer (or where-ever else comma expressions | |
78 | aren't permitted). */ | |
79 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) | |
80 | ||
81 | /* | |
82 | * Parse a 128 bit uuid in 4 integers | |
83 | * format is 32 hexx nibbles with options :.<space> separator | |
84 | * If not exactly 32 hex digits are found, return 0 | |
85 | * else return 1 | |
86 | */ | |
87 | int parse_uuid(char *str, int uuid[4]) | |
88 | { | |
89 | int hit = 0; /* number of Hex digIT */ | |
90 | int i; | |
91 | char c; | |
92 | for (i=0; i<4; i++) uuid[i]=0; | |
93 | ||
94 | while ((c= *str++)) { | |
95 | int n; | |
96 | if (c>='0' && c<='9') | |
97 | n = c-'0'; | |
98 | else if (c>='a' && c <= 'f') | |
99 | n = 10 + c - 'a'; | |
100 | else if (c>='A' && c <= 'F') | |
101 | n = 10 + c - 'A'; | |
102 | else if (strchr(":. -", c)) | |
103 | continue; | |
104 | else return 0; | |
105 | ||
106 | if (hit<32) { | |
107 | uuid[hit/8] <<= 4; | |
108 | uuid[hit/8] += n; | |
109 | } | |
110 | hit++; | |
111 | } | |
112 | if (hit == 32) | |
113 | return 1; | |
114 | return 0; | |
115 | } | |
116 | ||
117 | ||
118 | /* | |
119 | * Get the md version number. | |
120 | * We use the RAID_VERSION ioctl if it is supported | |
121 | * If not, but we have a block device with major '9', we assume | |
122 | * 0.36.0 | |
123 | * | |
124 | * Return version number as 24 but number - assume version parts | |
125 | * always < 255 | |
126 | */ | |
127 | ||
128 | int md_get_version(int fd) | |
129 | { | |
130 | struct stat stb; | |
131 | mdu_version_t vers; | |
132 | ||
133 | if (fstat(fd, &stb)<0) | |
134 | return -1; | |
135 | if ((S_IFMT&stb.st_mode) != S_IFBLK) | |
136 | return -1; | |
137 | ||
138 | if (ioctl(fd, RAID_VERSION, &vers) == 0) | |
139 | return (vers.major*10000) + (vers.minor*100) + vers.patchlevel; | |
140 | if (errno == EACCES) | |
141 | return -1; | |
142 | if (major(stb.st_rdev) == MD_MAJOR) | |
143 | return (3600); | |
144 | return -1; | |
145 | } | |
146 | ||
147 | int get_linux_version() | |
148 | { | |
149 | struct utsname name; | |
150 | char *cp; | |
151 | int a = 0, b = 0,c = 0; | |
152 | if (uname(&name) <0) | |
153 | return -1; | |
154 | ||
155 | cp = name.release; | |
156 | a = strtoul(cp, &cp, 10); | |
157 | if (*cp == '.') | |
158 | b = strtoul(cp+1, &cp, 10); | |
159 | if (*cp == '.') | |
160 | c = strtoul(cp+1, &cp, 10); | |
161 | ||
162 | return (a*1000000)+(b*1000)+c; | |
163 | } | |
164 | ||
165 | #ifndef MDASSEMBLE | |
166 | int mdadm_version(char *version) | |
167 | { | |
168 | int a, b, c; | |
169 | char *cp; | |
170 | ||
171 | if (!version) | |
172 | version = Version; | |
173 | ||
174 | cp = strchr(version, '-'); | |
175 | if (!cp || *(cp+1) != ' ' || *(cp+2) != 'v') | |
176 | return -1; | |
177 | cp += 3; | |
178 | a = strtoul(cp, &cp, 10); | |
179 | if (*cp != '.') | |
180 | return -1; | |
181 | b = strtoul(cp+1, &cp, 10); | |
182 | if (*cp == '.') | |
183 | c = strtoul(cp+1, &cp, 10); | |
184 | else | |
185 | c = 0; | |
186 | if (*cp != ' ' && *cp != '-') | |
187 | return -1; | |
188 | return (a*1000000)+(b*1000)+c; | |
189 | } | |
190 | ||
191 | long long parse_size(char *size) | |
192 | { | |
193 | /* parse 'size' which should be a number optionally | |
194 | * followed by 'K', 'M', or 'G'. | |
195 | * Without a suffix, K is assumed. | |
196 | * Number returned is in sectors (half-K) | |
197 | */ | |
198 | char *c; | |
199 | long long s = strtoll(size, &c, 10); | |
200 | if (s > 0) { | |
201 | switch (*c) { | |
202 | case 'K': | |
203 | c++; | |
204 | default: | |
205 | s *= 2; | |
206 | break; | |
207 | case 'M': | |
208 | c++; | |
209 | s *= 1024 * 2; | |
210 | break; | |
211 | case 'G': | |
212 | c++; | |
213 | s *= 1024 * 1024 * 2; | |
214 | break; | |
215 | } | |
216 | } | |
217 | if (*c) | |
218 | s = 0; | |
219 | return s; | |
220 | } | |
221 | ||
222 | int parse_layout_10(char *layout) | |
223 | { | |
224 | int copies, rv; | |
225 | char *cp; | |
226 | /* Parse the layout string for raid10 */ | |
227 | /* 'f', 'o' or 'n' followed by a number <= raid_disks */ | |
228 | if ((layout[0] != 'n' && layout[0] != 'f' && layout[0] != 'o') || | |
229 | (copies = strtoul(layout+1, &cp, 10)) < 1 || | |
230 | copies > 200 || | |
231 | *cp) | |
232 | return -1; | |
233 | if (layout[0] == 'n') | |
234 | rv = 256 + copies; | |
235 | else if (layout[0] == 'o') | |
236 | rv = 0x10000 + (copies<<8) + 1; | |
237 | else | |
238 | rv = 1 + (copies<<8); | |
239 | return rv; | |
240 | } | |
241 | ||
242 | int parse_layout_faulty(char *layout) | |
243 | { | |
244 | /* Parse the layout string for 'faulty' */ | |
245 | int ln = strcspn(layout, "0123456789"); | |
246 | char *m = strdup(layout); | |
247 | int mode; | |
248 | m[ln] = 0; | |
249 | mode = map_name(faultylayout, m); | |
250 | if (mode == UnSet) | |
251 | return -1; | |
252 | ||
253 | return mode | (atoi(layout+ln)<< ModeShift); | |
254 | } | |
255 | #endif | |
256 | ||
257 | void remove_partitions(int fd) | |
258 | { | |
259 | /* remove partitions from this block devices. | |
260 | * This is used for components added to an array | |
261 | */ | |
262 | #ifdef BLKPG_DEL_PARTITION | |
263 | struct blkpg_ioctl_arg a; | |
264 | struct blkpg_partition p; | |
265 | ||
266 | a.op = BLKPG_DEL_PARTITION; | |
267 | a.data = (void*)&p; | |
268 | a.datalen = sizeof(p); | |
269 | a.flags = 0; | |
270 | memset(a.data, 0, a.datalen); | |
271 | for (p.pno=0; p.pno < 16; p.pno++) | |
272 | ioctl(fd, BLKPG, &a); | |
273 | #endif | |
274 | } | |
275 | ||
276 | int test_partition(int fd) | |
277 | { | |
278 | /* Check if fd is a whole-disk or a partition. | |
279 | * BLKPG will return EINVAL on a partition, and BLKPG_DEL_PARTITION | |
280 | * will return ENXIO on an invalid partition number. | |
281 | */ | |
282 | struct blkpg_ioctl_arg a; | |
283 | struct blkpg_partition p; | |
284 | a.op = BLKPG_DEL_PARTITION; | |
285 | a.data = (void*)&p; | |
286 | a.datalen = sizeof(p); | |
287 | a.flags = 0; | |
288 | memset(a.data, 0, a.datalen); | |
289 | p.pno = 1<<30; | |
290 | if (ioctl(fd, BLKPG, &a) == 0) | |
291 | /* Very unlikely, but not a partition */ | |
292 | return 0; | |
293 | if (errno == ENXIO) | |
294 | /* not a partition */ | |
295 | return 0; | |
296 | ||
297 | return 1; | |
298 | } | |
299 | ||
300 | int test_partition_from_id(dev_t id) | |
301 | { | |
302 | char buf[20]; | |
303 | int fd, rv; | |
304 | ||
305 | sprintf(buf, "%d:%d", major(id), minor(id)); | |
306 | fd = dev_open(buf, O_RDONLY); | |
307 | if (fd < 0) | |
308 | return -1; | |
309 | rv = test_partition(fd); | |
310 | close(fd); | |
311 | return rv; | |
312 | } | |
313 | ||
314 | int enough(int level, int raid_disks, int layout, int clean, | |
315 | char *avail, int avail_disks) | |
316 | { | |
317 | int copies, first; | |
318 | switch (level) { | |
319 | case 10: | |
320 | /* This is the tricky one - we need to check | |
321 | * which actual disks are present. | |
322 | */ | |
323 | copies = (layout&255)* ((layout>>8) & 255); | |
324 | first=0; | |
325 | do { | |
326 | /* there must be one of the 'copies' form 'first' */ | |
327 | int n = copies; | |
328 | int cnt=0; | |
329 | while (n--) { | |
330 | if (avail[first]) | |
331 | cnt++; | |
332 | first = (first+1) % raid_disks; | |
333 | } | |
334 | if (cnt == 0) | |
335 | return 0; | |
336 | ||
337 | } while (first != 0); | |
338 | return 1; | |
339 | ||
340 | case LEVEL_MULTIPATH: | |
341 | return avail_disks>= 1; | |
342 | case LEVEL_LINEAR: | |
343 | case 0: | |
344 | return avail_disks == raid_disks; | |
345 | case 1: | |
346 | return avail_disks >= 1; | |
347 | case 4: | |
348 | case 5: | |
349 | if (clean) | |
350 | return avail_disks >= raid_disks-1; | |
351 | else | |
352 | return avail_disks >= raid_disks; | |
353 | case 6: | |
354 | if (clean) | |
355 | return avail_disks >= raid_disks-2; | |
356 | else | |
357 | return avail_disks >= raid_disks; | |
358 | default: | |
359 | return 0; | |
360 | } | |
361 | } | |
362 | ||
363 | int enough_fd(int fd) | |
364 | { | |
365 | struct mdu_array_info_s array; | |
366 | struct mdu_disk_info_s disk; | |
367 | int avail_disks = 0; | |
368 | int i, rv; | |
369 | char *avail; | |
370 | ||
371 | if (ioctl(fd, GET_ARRAY_INFO, &array) != 0 || | |
372 | array.raid_disks <= 0) | |
373 | return 0; | |
374 | avail = calloc(array.raid_disks, 1); | |
375 | for (i=0; i < 1024 && array.nr_disks > 0; i++) { | |
376 | disk.number = i; | |
377 | if (ioctl(fd, GET_DISK_INFO, &disk) != 0) | |
378 | continue; | |
379 | if (disk.major == 0 && disk.minor == 0) | |
380 | continue; | |
381 | array.nr_disks--; | |
382 | ||
383 | if (! (disk.state & (1<<MD_DISK_SYNC))) | |
384 | continue; | |
385 | if (disk.raid_disk < 0 || disk.raid_disk >= array.raid_disks) | |
386 | continue; | |
387 | avail_disks++; | |
388 | avail[disk.raid_disk] = 1; | |
389 | } | |
390 | /* This is used on an active array, so assume it is clean */ | |
391 | rv = enough(array.level, array.raid_disks, array.layout, | |
392 | 1, avail, avail_disks); | |
393 | free(avail); | |
394 | return rv; | |
395 | } | |
396 | ||
397 | ||
398 | const int uuid_zero[4] = { 0, 0, 0, 0 }; | |
399 | ||
400 | int same_uuid(int a[4], int b[4], int swapuuid) | |
401 | { | |
402 | if (swapuuid) { | |
403 | /* parse uuids are hostendian. | |
404 | * uuid's from some superblocks are big-ending | |
405 | * if there is a difference, we need to swap.. | |
406 | */ | |
407 | unsigned char *ac = (unsigned char *)a; | |
408 | unsigned char *bc = (unsigned char *)b; | |
409 | int i; | |
410 | for (i=0; i<16; i+= 4) { | |
411 | if (ac[i+0] != bc[i+3] || | |
412 | ac[i+1] != bc[i+2] || | |
413 | ac[i+2] != bc[i+1] || | |
414 | ac[i+3] != bc[i+0]) | |
415 | return 0; | |
416 | } | |
417 | return 1; | |
418 | } else { | |
419 | if (a[0]==b[0] && | |
420 | a[1]==b[1] && | |
421 | a[2]==b[2] && | |
422 | a[3]==b[3]) | |
423 | return 1; | |
424 | return 0; | |
425 | } | |
426 | } | |
427 | void copy_uuid(void *a, int b[4], int swapuuid) | |
428 | { | |
429 | if (swapuuid) { | |
430 | /* parse uuids are hostendian. | |
431 | * uuid's from some superblocks are big-ending | |
432 | * if there is a difference, we need to swap.. | |
433 | */ | |
434 | unsigned char *ac = (unsigned char *)a; | |
435 | unsigned char *bc = (unsigned char *)b; | |
436 | int i; | |
437 | for (i=0; i<16; i+= 4) { | |
438 | ac[i+0] = bc[i+3]; | |
439 | ac[i+1] = bc[i+2]; | |
440 | ac[i+2] = bc[i+1]; | |
441 | ac[i+3] = bc[i+0]; | |
442 | } | |
443 | } else | |
444 | memcpy(a, b, 16); | |
445 | } | |
446 | ||
447 | char *__fname_from_uuid(int id[4], int swap, char *buf, char sep) | |
448 | { | |
449 | int i, j; | |
450 | char uuid[16]; | |
451 | char *c = buf; | |
452 | strcpy(c, "UUID-"); | |
453 | c += strlen(c); | |
454 | copy_uuid(uuid, id, swap); | |
455 | for (i = 0; i < 4; i++) { | |
456 | if (i) | |
457 | *c++ = sep; | |
458 | for (j = 3; j >= 0; j--) { | |
459 | sprintf(c,"%02x", (unsigned char) uuid[j+4*i]); | |
460 | c+= 2; | |
461 | } | |
462 | } | |
463 | return buf; | |
464 | ||
465 | } | |
466 | ||
467 | char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep) | |
468 | { | |
469 | // dirty hack to work around an issue with super1 superblocks... | |
470 | // super1 superblocks need swapuuid set in order for assembly to | |
471 | // work, but can't have it set if we want this printout to match | |
472 | // all the other uuid printouts in super1.c, so we force swapuuid | |
473 | // to 1 to make our printout match the rest of super1 | |
474 | return __fname_from_uuid(info->uuid, (st->ss == &super1) ? 1 : st->ss->swapuuid, buf, sep); | |
475 | } | |
476 | ||
477 | #ifndef MDASSEMBLE | |
478 | int check_ext2(int fd, char *name) | |
479 | { | |
480 | /* | |
481 | * Check for an ext2fs file system. | |
482 | * Superblock is always 1K at 1K offset | |
483 | * | |
484 | * s_magic is le16 at 56 == 0xEF53 | |
485 | * report mtime - le32 at 44 | |
486 | * blocks - le32 at 4 | |
487 | * logblksize - le32 at 24 | |
488 | */ | |
489 | unsigned char sb[1024]; | |
490 | time_t mtime; | |
491 | int size, bsize; | |
492 | if (lseek(fd, 1024,0)!= 1024) | |
493 | return 0; | |
494 | if (read(fd, sb, 1024)!= 1024) | |
495 | return 0; | |
496 | if (sb[56] != 0x53 || sb[57] != 0xef) | |
497 | return 0; | |
498 | ||
499 | mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8; | |
500 | bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8; | |
501 | size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8; | |
502 | fprintf(stderr, Name ": %s appears to contain an ext2fs file system\n", | |
503 | name); | |
504 | fprintf(stderr," size=%dK mtime=%s", | |
505 | size*(1<<bsize), ctime(&mtime)); | |
506 | return 1; | |
507 | } | |
508 | ||
509 | int check_reiser(int fd, char *name) | |
510 | { | |
511 | /* | |
512 | * superblock is at 64K | |
513 | * size is 1024; | |
514 | * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52 | |
515 | * | |
516 | */ | |
517 | unsigned char sb[1024]; | |
518 | unsigned long size; | |
519 | if (lseek(fd, 64*1024, 0) != 64*1024) | |
520 | return 0; | |
521 | if (read(fd, sb, 1024) != 1024) | |
522 | return 0; | |
523 | if (strncmp((char*)sb+52, "ReIsErFs",8)!=0 && | |
524 | strncmp((char*)sb+52, "ReIsEr2Fs",9)!=0) | |
525 | return 0; | |
526 | fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name); | |
527 | size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8; | |
528 | fprintf(stderr, " size = %luK\n", size*4); | |
529 | ||
530 | return 1; | |
531 | } | |
532 | ||
533 | int check_raid(int fd, char *name) | |
534 | { | |
535 | struct mdinfo info; | |
536 | time_t crtime; | |
537 | char *level; | |
538 | struct supertype *st = guess_super(fd); | |
539 | ||
540 | if (!st) return 0; | |
541 | st->ignore_hw_compat = 1; | |
542 | st->ss->load_super(st, fd, name); | |
543 | /* Looks like a raid array .. */ | |
544 | fprintf(stderr, Name ": %s appears to be part of a raid array:\n", | |
545 | name); | |
546 | st->ss->getinfo_super(st, &info, NULL); | |
547 | st->ss->free_super(st); | |
548 | crtime = info.array.ctime; | |
549 | level = map_num(pers, info.array.level); | |
550 | if (!level) level = "-unknown-"; | |
551 | fprintf(stderr, " level=%s devices=%d ctime=%s", | |
552 | level, info.array.raid_disks, ctime(&crtime)); | |
553 | return 1; | |
554 | } | |
555 | ||
556 | int ask(char *mesg) | |
557 | { | |
558 | char *add = ""; | |
559 | int i; | |
560 | for (i=0; i<5; i++) { | |
561 | char buf[100]; | |
562 | fprintf(stderr, "%s%s", mesg, add); | |
563 | fflush(stderr); | |
564 | if (fgets(buf, 100, stdin)==NULL) | |
565 | return 0; | |
566 | if (buf[0]=='y' || buf[0]=='Y') | |
567 | return 1; | |
568 | if (buf[0]=='n' || buf[0]=='N') | |
569 | return 0; | |
570 | add = "(y/n) "; | |
571 | } | |
572 | fprintf(stderr, Name ": assuming 'no'\n"); | |
573 | return 0; | |
574 | } | |
575 | #endif /* MDASSEMBLE */ | |
576 | ||
577 | int is_standard(char *dev, int *nump) | |
578 | { | |
579 | /* tests if dev is a "standard" md dev name. | |
580 | * i.e if the last component is "/dNN" or "/mdNN", | |
581 | * where NN is a string of digits | |
582 | * Returns 1 if a partitionable standard, | |
583 | * -1 if non-partitonable, | |
584 | * 0 if not a standard name. | |
585 | */ | |
586 | char *d = strrchr(dev, '/'); | |
587 | int type=0; | |
588 | int num; | |
589 | if (!d) | |
590 | return 0; | |
591 | if (strncmp(d, "/d",2)==0) | |
592 | d += 2, type=1; /* /dev/md/dN{pM} */ | |
593 | else if (strncmp(d, "/md_d", 5)==0) | |
594 | d += 5, type=1; /* /dev/md_dN{pM} */ | |
595 | else if (strncmp(d, "/md", 3)==0) | |
596 | d += 3, type=-1; /* /dev/mdN */ | |
597 | else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0) | |
598 | d += 1, type=-1; /* /dev/md/N */ | |
599 | else | |
600 | return 0; | |
601 | if (!*d) | |
602 | return 0; | |
603 | num = atoi(d); | |
604 | while (isdigit(*d)) | |
605 | d++; | |
606 | if (*d) | |
607 | return 0; | |
608 | if (nump) *nump = num; | |
609 | ||
610 | return type; | |
611 | } | |
612 | ||
613 | unsigned long calc_csum(void *super, int bytes) | |
614 | { | |
615 | unsigned long long newcsum = 0; | |
616 | int i; | |
617 | unsigned int csum; | |
618 | unsigned int *superc = (unsigned int*) super; | |
619 | ||
620 | for(i=0; i<bytes/4; i++) | |
621 | newcsum+= superc[i]; | |
622 | csum = (newcsum& 0xffffffff) + (newcsum>>32); | |
623 | #ifdef __alpha__ | |
624 | /* The in-kernel checksum calculation is always 16bit on | |
625 | * the alpha, though it is 32 bit on i386... | |
626 | * I wonder what it is elsewhere... (it uses and API in | |
627 | * a way that it shouldn't). | |
628 | */ | |
629 | csum = (csum & 0xffff) + (csum >> 16); | |
630 | csum = (csum & 0xffff) + (csum >> 16); | |
631 | #endif | |
632 | return csum; | |
633 | } | |
634 | ||
635 | #ifndef MDASSEMBLE | |
636 | char *human_size(long long bytes) | |
637 | { | |
638 | static char buf[30]; | |
639 | ||
640 | /* We convert bytes to either centi-M{ega,ibi}bytes or | |
641 | * centi-G{igi,ibi}bytes, with appropriate rounding, | |
642 | * and then print 1/100th of those as a decimal. | |
643 | * We allow upto 2048Megabytes before converting to | |
644 | * gigabytes, as that shows more precision and isn't | |
645 | * too large a number. | |
646 | * Terabytes are not yet handled. | |
647 | */ | |
648 | ||
649 | if (bytes < 5000*1024) | |
650 | buf[0]=0; | |
651 | else if (bytes < 2*1024LL*1024LL*1024LL) { | |
652 | long cMiB = (bytes / ( (1LL<<20) / 200LL ) +1) /2; | |
653 | long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2; | |
654 | snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)", | |
655 | cMiB/100 , cMiB % 100, | |
656 | cMB/100, cMB % 100); | |
657 | } else { | |
658 | long cGiB = (bytes / ( (1LL<<30) / 200LL ) +1) /2; | |
659 | long cGB = (bytes / (1000000000LL/200LL ) +1) /2; | |
660 | snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)", | |
661 | cGiB/100 , cGiB % 100, | |
662 | cGB/100, cGB % 100); | |
663 | } | |
664 | return buf; | |
665 | } | |
666 | ||
667 | char *human_size_brief(long long bytes) | |
668 | { | |
669 | static char buf[30]; | |
670 | ||
671 | if (bytes < 5000*1024) | |
672 | snprintf(buf, sizeof(buf), "%ld.%02ldKiB", | |
673 | (long)(bytes>>10), (long)(((bytes&1023)*100+512)/1024) | |
674 | ); | |
675 | else if (bytes < 2*1024LL*1024LL*1024LL) | |
676 | snprintf(buf, sizeof(buf), "%ld.%02ldMiB", | |
677 | (long)(bytes>>20), | |
678 | (long)((bytes&0xfffff)+0x100000/200)/(0x100000/100) | |
679 | ); | |
680 | else | |
681 | snprintf(buf, sizeof(buf), "%ld.%02ldGiB", | |
682 | (long)(bytes>>30), | |
683 | (long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100) | |
684 | ); | |
685 | return buf; | |
686 | } | |
687 | ||
688 | void print_r10_layout(int layout) | |
689 | { | |
690 | int near = layout & 255; | |
691 | int far = (layout >> 8) & 255; | |
692 | int offset = (layout&0x10000); | |
693 | char *sep = ""; | |
694 | ||
695 | if (near != 1) { | |
696 | printf("%s near=%d", sep, near); | |
697 | sep = ","; | |
698 | } | |
699 | if (far != 1) | |
700 | printf("%s %s=%d", sep, offset?"offset":"far", far); | |
701 | if (near*far == 1) | |
702 | printf("NO REDUNDANCY"); | |
703 | } | |
704 | #endif | |
705 | ||
706 | unsigned long long calc_array_size(int level, int raid_disks, int layout, | |
707 | int chunksize, unsigned long long devsize) | |
708 | { | |
709 | devsize &= ~(unsigned long long)((chunksize>>9)-1); | |
710 | return get_data_disks(level, layout, raid_disks) * devsize; | |
711 | } | |
712 | ||
713 | int get_data_disks(int level, int layout, int raid_disks) | |
714 | { | |
715 | int data_disks = 0; | |
716 | switch (level) { | |
717 | case 0: data_disks = raid_disks; break; | |
718 | case 1: data_disks = 1; break; | |
719 | case 4: | |
720 | case 5: data_disks = raid_disks - 1; break; | |
721 | case 6: data_disks = raid_disks - 2; break; | |
722 | case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255); | |
723 | break; | |
724 | } | |
725 | ||
726 | return data_disks; | |
727 | } | |
728 | ||
729 | #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) | |
730 | char *get_md_name(int dev) | |
731 | { | |
732 | /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */ | |
733 | /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */ | |
734 | static char devname[50]; | |
735 | struct stat stb; | |
736 | dev_t rdev; | |
737 | char *dn; | |
738 | ||
739 | if (dev < 0) { | |
740 | int mdp = get_mdp_major(); | |
741 | if (mdp < 0) return NULL; | |
742 | rdev = makedev(mdp, (-1-dev)<<6); | |
743 | snprintf(devname, sizeof(devname), "/dev/md/d%d", -1-dev); | |
744 | if (stat(devname, &stb) == 0 | |
745 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
746 | && (stb.st_rdev == rdev)) | |
747 | return devname; | |
748 | } else { | |
749 | rdev = makedev(MD_MAJOR, dev); | |
750 | snprintf(devname, sizeof(devname), "/dev/md%d", dev); | |
751 | if (stat(devname, &stb) == 0 | |
752 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
753 | && (stb.st_rdev == rdev)) | |
754 | return devname; | |
755 | ||
756 | snprintf(devname, sizeof(devname), "/dev/md/%d", dev); | |
757 | if (stat(devname, &stb) == 0 | |
758 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
759 | && (stb.st_rdev == rdev)) | |
760 | return devname; | |
761 | } | |
762 | dn = map_dev(major(rdev), minor(rdev), 0); | |
763 | if (dn) | |
764 | return dn; | |
765 | snprintf(devname, sizeof(devname), "/dev/.tmp.md%d", dev); | |
766 | if (mknod(devname, S_IFBLK | 0600, rdev) == -1) | |
767 | if (errno != EEXIST) | |
768 | return NULL; | |
769 | ||
770 | if (stat(devname, &stb) == 0 | |
771 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
772 | && (stb.st_rdev == rdev)) | |
773 | return devname; | |
774 | unlink(devname); | |
775 | return NULL; | |
776 | } | |
777 | ||
778 | void put_md_name(char *name) | |
779 | { | |
780 | if (strncmp(name, "/dev/.tmp.md", 12)==0) | |
781 | unlink(name); | |
782 | } | |
783 | ||
784 | int find_free_devnum(int use_partitions) | |
785 | { | |
786 | int devnum; | |
787 | for (devnum = 127; devnum != 128; | |
788 | devnum = devnum ? devnum-1 : (1<<20)-1) { | |
789 | char *dn; | |
790 | int _devnum; | |
791 | ||
792 | _devnum = use_partitions ? (-1-devnum) : devnum; | |
793 | if (mddev_busy(_devnum)) | |
794 | continue; | |
795 | /* make sure it is new to /dev too, at least as a | |
796 | * non-standard */ | |
797 | dn = map_dev(dev2major(_devnum), dev2minor(_devnum), 0); | |
798 | if (dn && ! is_standard(dn, NULL)) | |
799 | continue; | |
800 | break; | |
801 | } | |
802 | if (devnum == 128) | |
803 | return NoMdDev; | |
804 | return use_partitions ? (-1-devnum) : devnum; | |
805 | } | |
806 | #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */ | |
807 | ||
808 | int dev_open(char *dev, int flags) | |
809 | { | |
810 | /* like 'open', but if 'dev' matches %d:%d, create a temp | |
811 | * block device and open that | |
812 | */ | |
813 | char *e; | |
814 | int fd = -1; | |
815 | char devname[32]; | |
816 | int major; | |
817 | int minor; | |
818 | ||
819 | if (!dev) return -1; | |
820 | flags |= O_DIRECT; | |
821 | ||
822 | major = strtoul(dev, &e, 0); | |
823 | if (e > dev && *e == ':' && e[1] && | |
824 | (minor = strtoul(e+1, &e, 0)) >= 0 && | |
825 | *e == 0) { | |
826 | char *path = map_dev(major, minor, 0); | |
827 | if (path) | |
828 | fd = open(path, flags); | |
829 | if (fd < 0) { | |
830 | snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d:%d", | |
831 | (int)getpid(), major, minor); | |
832 | if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) { | |
833 | fd = open(devname, flags); | |
834 | unlink(devname); | |
835 | } | |
836 | } | |
837 | if (fd < 0) { | |
838 | snprintf(devname, sizeof(devname), "/tmp/.tmp.md.%d:%d:%d", | |
839 | (int)getpid(), major, minor); | |
840 | if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) { | |
841 | fd = open(devname, flags); | |
842 | unlink(devname); | |
843 | } | |
844 | } | |
845 | } else | |
846 | fd = open(dev, flags); | |
847 | return fd; | |
848 | } | |
849 | ||
850 | int open_dev_flags(int devnum, int flags) | |
851 | { | |
852 | char buf[20]; | |
853 | ||
854 | sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum)); | |
855 | return dev_open(buf, flags); | |
856 | } | |
857 | ||
858 | int open_dev(int devnum) | |
859 | { | |
860 | return open_dev_flags(devnum, O_RDONLY); | |
861 | } | |
862 | ||
863 | int open_dev_excl(int devnum) | |
864 | { | |
865 | char buf[20]; | |
866 | int i; | |
867 | int flags = O_RDWR; | |
868 | ||
869 | sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum)); | |
870 | for (i=0 ; i<25 ; i++) { | |
871 | int fd = dev_open(buf, flags|O_EXCL); | |
872 | if (fd >= 0) | |
873 | return fd; | |
874 | if (errno == EACCES && flags == O_RDWR) { | |
875 | flags = O_RDONLY; | |
876 | continue; | |
877 | } | |
878 | if (errno != EBUSY) | |
879 | return fd; | |
880 | usleep(200000); | |
881 | } | |
882 | return -1; | |
883 | } | |
884 | ||
885 | int same_dev(char *one, char *two) | |
886 | { | |
887 | struct stat st1, st2; | |
888 | if (stat(one, &st1) != 0) | |
889 | return 0; | |
890 | if (stat(two, &st2) != 0) | |
891 | return 0; | |
892 | if ((st1.st_mode & S_IFMT) != S_IFBLK) | |
893 | return 0; | |
894 | if ((st2.st_mode & S_IFMT) != S_IFBLK) | |
895 | return 0; | |
896 | return st1.st_rdev == st2.st_rdev; | |
897 | } | |
898 | ||
899 | void wait_for(char *dev, int fd) | |
900 | { | |
901 | int i; | |
902 | struct stat stb_want; | |
903 | ||
904 | if (fstat(fd, &stb_want) != 0 || | |
905 | (stb_want.st_mode & S_IFMT) != S_IFBLK) | |
906 | return; | |
907 | ||
908 | for (i=0 ; i<25 ; i++) { | |
909 | struct stat stb; | |
910 | if (stat(dev, &stb) == 0 && | |
911 | (stb.st_mode & S_IFMT) == S_IFBLK && | |
912 | (stb.st_rdev == stb_want.st_rdev)) | |
913 | return; | |
914 | usleep(200000); | |
915 | } | |
916 | if (i == 25) | |
917 | dprintf("%s: timeout waiting for %s\n", __func__, dev); | |
918 | } | |
919 | ||
920 | struct superswitch *superlist[] = | |
921 | { | |
922 | &super0, &super1, | |
923 | &super_ddf, &super_imsm, | |
924 | &mbr, &gpt, | |
925 | NULL }; | |
926 | ||
927 | #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) | |
928 | ||
929 | struct supertype *super_by_fd(int fd, char **subarrayp) | |
930 | { | |
931 | mdu_array_info_t array; | |
932 | int vers; | |
933 | int minor; | |
934 | struct supertype *st = NULL; | |
935 | struct mdinfo *sra; | |
936 | char *verstr; | |
937 | char version[20]; | |
938 | int i; | |
939 | char *subarray = NULL; | |
940 | int container = NoMdDev; | |
941 | ||
942 | sra = sysfs_read(fd, 0, GET_VERSION); | |
943 | ||
944 | if (sra) { | |
945 | vers = sra->array.major_version; | |
946 | minor = sra->array.minor_version; | |
947 | verstr = sra->text_version; | |
948 | } else { | |
949 | if (ioctl(fd, GET_ARRAY_INFO, &array)) | |
950 | array.major_version = array.minor_version = 0; | |
951 | vers = array.major_version; | |
952 | minor = array.minor_version; | |
953 | verstr = ""; | |
954 | } | |
955 | ||
956 | if (vers != -1) { | |
957 | sprintf(version, "%d.%d", vers, minor); | |
958 | verstr = version; | |
959 | } | |
960 | if (minor == -2 && is_subarray(verstr)) { | |
961 | char *dev = verstr+1; | |
962 | ||
963 | subarray = strchr(dev, '/'); | |
964 | if (subarray) | |
965 | *subarray++ = '\0'; | |
966 | subarray = strdup(subarray); | |
967 | container = devname2devnum(dev); | |
968 | if (sra) | |
969 | sysfs_free(sra); | |
970 | sra = sysfs_read(-1, container, GET_VERSION); | |
971 | if (sra && sra->text_version[0]) | |
972 | verstr = sra->text_version; | |
973 | else | |
974 | verstr = "-no-metadata-"; | |
975 | } | |
976 | ||
977 | for (i = 0; st == NULL && superlist[i] ; i++) | |
978 | st = superlist[i]->match_metadata_desc(verstr); | |
979 | ||
980 | if (sra) | |
981 | sysfs_free(sra); | |
982 | if (st) { | |
983 | st->sb = NULL; | |
984 | if (subarrayp) | |
985 | *subarrayp = subarray; | |
986 | st->container_dev = container; | |
987 | st->devnum = fd2devnum(fd); | |
988 | } else | |
989 | free(subarray); | |
990 | ||
991 | return st; | |
992 | } | |
993 | #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */ | |
994 | ||
995 | int dev_size_from_id(dev_t id, unsigned long long *size) | |
996 | { | |
997 | char buf[20]; | |
998 | int fd; | |
999 | ||
1000 | sprintf(buf, "%d:%d", major(id), minor(id)); | |
1001 | fd = dev_open(buf, O_RDONLY); | |
1002 | if (fd < 0) | |
1003 | return 0; | |
1004 | if (get_dev_size(fd, NULL, size)) { | |
1005 | close(fd); | |
1006 | return 1; | |
1007 | } | |
1008 | close(fd); | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | struct supertype *dup_super(struct supertype *orig) | |
1013 | { | |
1014 | struct supertype *st; | |
1015 | ||
1016 | if (!orig) | |
1017 | return orig; | |
1018 | st = malloc(sizeof(*st)); | |
1019 | if (!st) | |
1020 | return st; | |
1021 | memset(st, 0, sizeof(*st)); | |
1022 | st->ss = orig->ss; | |
1023 | st->max_devs = orig->max_devs; | |
1024 | st->minor_version = orig->minor_version; | |
1025 | st->sb = NULL; | |
1026 | st->info = NULL; | |
1027 | return st; | |
1028 | } | |
1029 | ||
1030 | struct supertype *guess_super_type(int fd, enum guess_types guess_type) | |
1031 | { | |
1032 | /* try each load_super to find the best match, | |
1033 | * and return the best superswitch | |
1034 | */ | |
1035 | struct superswitch *ss; | |
1036 | struct supertype *st; | |
1037 | time_t besttime = 0; | |
1038 | int bestsuper = -1; | |
1039 | int i; | |
1040 | ||
1041 | st = malloc(sizeof(*st)); | |
1042 | memset(st, 0, sizeof(*st)); | |
1043 | st->container_dev = NoMdDev; | |
1044 | ||
1045 | for (i=0 ; superlist[i]; i++) { | |
1046 | int rv; | |
1047 | ss = superlist[i]; | |
1048 | if (guess_type == guess_array && ss->add_to_super == NULL) | |
1049 | continue; | |
1050 | if (guess_type == guess_partitions && ss->add_to_super != NULL) | |
1051 | continue; | |
1052 | memset(st, 0, sizeof(*st)); | |
1053 | st->ignore_hw_compat = 1; | |
1054 | rv = ss->load_super(st, fd, NULL); | |
1055 | if (rv == 0) { | |
1056 | struct mdinfo info; | |
1057 | st->ss->getinfo_super(st, &info, NULL); | |
1058 | if (bestsuper == -1 || | |
1059 | besttime < info.array.ctime) { | |
1060 | bestsuper = i; | |
1061 | besttime = info.array.ctime; | |
1062 | } | |
1063 | ss->free_super(st); | |
1064 | } | |
1065 | } | |
1066 | if (bestsuper != -1) { | |
1067 | int rv; | |
1068 | memset(st, 0, sizeof(*st)); | |
1069 | st->ignore_hw_compat = 1; | |
1070 | rv = superlist[bestsuper]->load_super(st, fd, NULL); | |
1071 | if (rv == 0) { | |
1072 | superlist[bestsuper]->free_super(st); | |
1073 | st->ignore_hw_compat = 0; | |
1074 | return st; | |
1075 | } | |
1076 | } | |
1077 | free(st); | |
1078 | return NULL; | |
1079 | } | |
1080 | ||
1081 | /* Return size of device in bytes */ | |
1082 | int get_dev_size(int fd, char *dname, unsigned long long *sizep) | |
1083 | { | |
1084 | unsigned long long ldsize; | |
1085 | struct stat st; | |
1086 | ||
1087 | if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode)) | |
1088 | ldsize = (unsigned long long)st.st_size; | |
1089 | else | |
1090 | #ifdef BLKGETSIZE64 | |
1091 | if (ioctl(fd, BLKGETSIZE64, &ldsize) != 0) | |
1092 | #endif | |
1093 | { | |
1094 | unsigned long dsize; | |
1095 | if (ioctl(fd, BLKGETSIZE, &dsize) == 0) { | |
1096 | ldsize = dsize; | |
1097 | ldsize <<= 9; | |
1098 | } else { | |
1099 | if (dname) | |
1100 | fprintf(stderr, Name ": Cannot get size of %s: %s\b", | |
1101 | dname, strerror(errno)); | |
1102 | return 0; | |
1103 | } | |
1104 | } | |
1105 | *sizep = ldsize; | |
1106 | return 1; | |
1107 | } | |
1108 | ||
1109 | /* Return true if this can only be a container, not a member device. | |
1110 | * i.e. is and md device and size is zero | |
1111 | */ | |
1112 | int must_be_container(int fd) | |
1113 | { | |
1114 | unsigned long long size; | |
1115 | if (md_get_version(fd) < 0) | |
1116 | return 0; | |
1117 | if (get_dev_size(fd, NULL, &size) == 0) | |
1118 | return 1; | |
1119 | if (size == 0) | |
1120 | return 1; | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | /* Sets endofpart parameter to the last block used by the last GPT partition on the device. | |
1125 | * Returns: 1 if successful | |
1126 | * -1 for unknown partition type | |
1127 | * 0 for other errors | |
1128 | */ | |
1129 | static int get_gpt_last_partition_end(int fd, unsigned long long *endofpart) | |
1130 | { | |
1131 | struct GPT gpt; | |
1132 | unsigned char empty_gpt_entry[16]= {0}; | |
1133 | struct GPT_part_entry *part; | |
1134 | char buf[512]; | |
1135 | unsigned long long curr_part_end; | |
1136 | unsigned all_partitions, entry_size; | |
1137 | unsigned part_nr; | |
1138 | ||
1139 | *endofpart = 0; | |
1140 | ||
1141 | BUILD_BUG_ON(sizeof(gpt) != 512); | |
1142 | /* skip protective MBR */ | |
1143 | lseek(fd, 512, SEEK_SET); | |
1144 | /* read GPT header */ | |
1145 | if (read(fd, &gpt, 512) != 512) | |
1146 | return 0; | |
1147 | ||
1148 | /* get the number of partition entries and the entry size */ | |
1149 | all_partitions = __le32_to_cpu(gpt.part_cnt); | |
1150 | entry_size = __le32_to_cpu(gpt.part_size); | |
1151 | ||
1152 | /* Check GPT signature*/ | |
1153 | if (gpt.magic != GPT_SIGNATURE_MAGIC) | |
1154 | return -1; | |
1155 | ||
1156 | /* sanity checks */ | |
1157 | if (all_partitions > 1024 || | |
1158 | entry_size > sizeof(buf)) | |
1159 | return -1; | |
1160 | ||
1161 | part = (struct GPT_part_entry *)buf; | |
1162 | ||
1163 | for (part_nr=0; part_nr < all_partitions; part_nr++) { | |
1164 | /* read partition entry */ | |
1165 | if (read(fd, buf, entry_size) != (ssize_t)entry_size) | |
1166 | return 0; | |
1167 | ||
1168 | /* is this valid partition? */ | |
1169 | if (memcmp(part->type_guid, empty_gpt_entry, 16) != 0) { | |
1170 | /* check the last lba for the current partition */ | |
1171 | curr_part_end = __le64_to_cpu(part->ending_lba); | |
1172 | if (curr_part_end > *endofpart) | |
1173 | *endofpart = curr_part_end; | |
1174 | } | |
1175 | ||
1176 | } | |
1177 | return 1; | |
1178 | } | |
1179 | ||
1180 | /* Sets endofpart parameter to the last block used by the last partition on the device. | |
1181 | * Returns: 1 if successful | |
1182 | * -1 for unknown partition type | |
1183 | * 0 for other errors | |
1184 | */ | |
1185 | static int get_last_partition_end(int fd, unsigned long long *endofpart) | |
1186 | { | |
1187 | struct MBR boot_sect; | |
1188 | struct MBR_part_record *part; | |
1189 | unsigned long long curr_part_end; | |
1190 | unsigned part_nr; | |
1191 | int retval = 0; | |
1192 | ||
1193 | *endofpart = 0; | |
1194 | ||
1195 | BUILD_BUG_ON(sizeof(boot_sect) != 512); | |
1196 | /* read MBR */ | |
1197 | lseek(fd, 0, 0); | |
1198 | if (read(fd, &boot_sect, 512) != 512) | |
1199 | goto abort; | |
1200 | ||
1201 | /* check MBP signature */ | |
1202 | if (boot_sect.magic == MBR_SIGNATURE_MAGIC) { | |
1203 | retval = 1; | |
1204 | /* found the correct signature */ | |
1205 | part = boot_sect.parts; | |
1206 | ||
1207 | for (part_nr=0; part_nr < MBR_PARTITIONS; part_nr++) { | |
1208 | /* check for GPT type */ | |
1209 | if (part->part_type == MBR_GPT_PARTITION_TYPE) { | |
1210 | retval = get_gpt_last_partition_end(fd, endofpart); | |
1211 | break; | |
1212 | } | |
1213 | /* check the last used lba for the current partition */ | |
1214 | curr_part_end = __le32_to_cpu(part->first_sect_lba) + | |
1215 | __le32_to_cpu(part->blocks_num); | |
1216 | if (curr_part_end > *endofpart) | |
1217 | *endofpart = curr_part_end; | |
1218 | ||
1219 | part++; | |
1220 | } | |
1221 | } else { | |
1222 | /* Unknown partition table */ | |
1223 | retval = -1; | |
1224 | } | |
1225 | abort: | |
1226 | return retval; | |
1227 | } | |
1228 | ||
1229 | int check_partitions(int fd, char *dname, unsigned long long freesize, | |
1230 | unsigned long long size) | |
1231 | { | |
1232 | /* | |
1233 | * Check where the last partition ends | |
1234 | */ | |
1235 | unsigned long long endofpart; | |
1236 | int ret; | |
1237 | ||
1238 | if ((ret = get_last_partition_end(fd, &endofpart)) > 0) { | |
1239 | /* There appears to be a partition table here */ | |
1240 | if (freesize == 0) { | |
1241 | /* partitions will not be visible in new device */ | |
1242 | fprintf(stderr, | |
1243 | Name ": partition table exists on %s but will be lost or\n" | |
1244 | " meaningless after creating array\n", | |
1245 | dname); | |
1246 | return 1; | |
1247 | } else if (endofpart > freesize) { | |
1248 | /* last partition overlaps metadata */ | |
1249 | fprintf(stderr, | |
1250 | Name ": metadata will over-write last partition on %s.\n", | |
1251 | dname); | |
1252 | return 1; | |
1253 | } else if (size && endofpart > size) { | |
1254 | /* partitions will be truncated in new device */ | |
1255 | fprintf(stderr, | |
1256 | Name ": array size is too small to cover all partitions on %s.\n", | |
1257 | dname); | |
1258 | return 1; | |
1259 | } | |
1260 | } | |
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk) | |
1265 | { | |
1266 | int d; | |
1267 | ||
1268 | ioctl(mdfd, GET_ARRAY_INFO, ainf); | |
1269 | for (d = 0 ; d < 1024 ; d++) { | |
1270 | if (ioctl(mdfd, GET_DISK_INFO, disk) == 0 && | |
1271 | (disk->major || disk->minor)) | |
1272 | return; | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | int open_container(int fd) | |
1277 | { | |
1278 | /* 'fd' is a block device. Find out if it is in use | |
1279 | * by a container, and return an open fd on that container. | |
1280 | */ | |
1281 | char path[256]; | |
1282 | char *e; | |
1283 | DIR *dir; | |
1284 | struct dirent *de; | |
1285 | int dfd, n; | |
1286 | char buf[200]; | |
1287 | int major, minor; | |
1288 | struct stat st; | |
1289 | ||
1290 | if (fstat(fd, &st) != 0) | |
1291 | return -1; | |
1292 | sprintf(path, "/sys/dev/block/%d:%d/holders", | |
1293 | (int)major(st.st_rdev), (int)minor(st.st_rdev)); | |
1294 | e = path + strlen(path); | |
1295 | ||
1296 | dir = opendir(path); | |
1297 | if (!dir) | |
1298 | return -1; | |
1299 | while ((de = readdir(dir))) { | |
1300 | if (de->d_ino == 0) | |
1301 | continue; | |
1302 | if (de->d_name[0] == '.') | |
1303 | continue; | |
1304 | sprintf(e, "/%s/dev", de->d_name); | |
1305 | dfd = open(path, O_RDONLY); | |
1306 | if (dfd < 0) | |
1307 | continue; | |
1308 | n = read(dfd, buf, sizeof(buf)); | |
1309 | close(dfd); | |
1310 | if (n <= 0 || (unsigned)n >= sizeof(buf)) | |
1311 | continue; | |
1312 | buf[n] = 0; | |
1313 | if (sscanf(buf, "%d:%d", &major, &minor) != 2) | |
1314 | continue; | |
1315 | sprintf(buf, "%d:%d", major, minor); | |
1316 | dfd = dev_open(buf, O_RDONLY); | |
1317 | if (dfd >= 0) { | |
1318 | closedir(dir); | |
1319 | return dfd; | |
1320 | } | |
1321 | } | |
1322 | closedir(dir); | |
1323 | return -1; | |
1324 | } | |
1325 | ||
1326 | struct superswitch *version_to_superswitch(char *vers) | |
1327 | { | |
1328 | int i; | |
1329 | ||
1330 | for (i = 0; superlist[i]; i++) { | |
1331 | struct superswitch *ss = superlist[i]; | |
1332 | ||
1333 | if (strcmp(vers, ss->name) == 0) | |
1334 | return ss; | |
1335 | } | |
1336 | ||
1337 | return NULL; | |
1338 | } | |
1339 | ||
1340 | int is_container_member(struct mdstat_ent *mdstat, char *container) | |
1341 | { | |
1342 | if (mdstat->metadata_version == NULL || | |
1343 | strncmp(mdstat->metadata_version, "external:", 9) != 0 || | |
1344 | !is_subarray(mdstat->metadata_version+9) || | |
1345 | strncmp(mdstat->metadata_version+10, container, strlen(container)) != 0 || | |
1346 | mdstat->metadata_version[10+strlen(container)] != '/') | |
1347 | return 0; | |
1348 | ||
1349 | return 1; | |
1350 | } | |
1351 | ||
1352 | int is_subarray_active(char *subarray, char *container) | |
1353 | { | |
1354 | struct mdstat_ent *mdstat = mdstat_read(0, 0); | |
1355 | struct mdstat_ent *ent; | |
1356 | ||
1357 | for (ent = mdstat; ent; ent = ent->next) | |
1358 | if (is_container_member(ent, container)) | |
1359 | if (strcmp(to_subarray(ent, container), subarray) == 0) | |
1360 | break; | |
1361 | ||
1362 | free_mdstat(mdstat); | |
1363 | ||
1364 | return ent != NULL; | |
1365 | } | |
1366 | ||
1367 | /* open_subarray - opens a subarray in a container | |
1368 | * @dev: container device name | |
1369 | * @st: empty supertype | |
1370 | * @quiet: block reporting errors flag | |
1371 | * | |
1372 | * On success returns an fd to a container and fills in *st | |
1373 | */ | |
1374 | int open_subarray(char *dev, char *subarray, struct supertype *st, int quiet) | |
1375 | { | |
1376 | struct mdinfo *mdi; | |
1377 | struct mdinfo *info; | |
1378 | int fd, err = 1; | |
1379 | ||
1380 | fd = open(dev, O_RDWR|O_EXCL); | |
1381 | if (fd < 0) { | |
1382 | if (!quiet) | |
1383 | fprintf(stderr, Name ": Couldn't open %s, aborting\n", | |
1384 | dev); | |
1385 | return -1; | |
1386 | } | |
1387 | ||
1388 | st->devnum = fd2devnum(fd); | |
1389 | if (st->devnum == NoMdDev) { | |
1390 | if (!quiet) | |
1391 | fprintf(stderr, | |
1392 | Name ": Failed to determine device number for %s\n", | |
1393 | dev); | |
1394 | goto close_fd; | |
1395 | } | |
1396 | ||
1397 | mdi = sysfs_read(fd, st->devnum, GET_VERSION|GET_LEVEL); | |
1398 | if (!mdi) { | |
1399 | if (!quiet) | |
1400 | fprintf(stderr, Name ": Failed to read sysfs for %s\n", | |
1401 | dev); | |
1402 | goto close_fd; | |
1403 | } | |
1404 | ||
1405 | if (mdi->array.level != UnSet) { | |
1406 | if (!quiet) | |
1407 | fprintf(stderr, Name ": %s is not a container\n", dev); | |
1408 | goto free_sysfs; | |
1409 | } | |
1410 | ||
1411 | st->ss = version_to_superswitch(mdi->text_version); | |
1412 | if (!st->ss) { | |
1413 | if (!quiet) | |
1414 | fprintf(stderr, | |
1415 | Name ": Operation not supported for %s metadata\n", | |
1416 | mdi->text_version); | |
1417 | goto free_sysfs; | |
1418 | } | |
1419 | ||
1420 | st->devname = devnum2devname(st->devnum); | |
1421 | if (!st->devname) { | |
1422 | if (!quiet) | |
1423 | fprintf(stderr, Name ": Failed to allocate device name\n"); | |
1424 | goto free_sysfs; | |
1425 | } | |
1426 | ||
1427 | if (!st->ss->load_container) { | |
1428 | if (!quiet) | |
1429 | fprintf(stderr, Name ": %s is not a container\n", dev); | |
1430 | goto free_name; | |
1431 | } | |
1432 | ||
1433 | if (st->ss->load_container(st, fd, NULL)) { | |
1434 | if (!quiet) | |
1435 | fprintf(stderr, Name ": Failed to load metadata for %s\n", | |
1436 | dev); | |
1437 | goto free_name; | |
1438 | } | |
1439 | ||
1440 | info = st->ss->container_content(st, subarray); | |
1441 | if (!info) { | |
1442 | if (!quiet) | |
1443 | fprintf(stderr, Name ": Failed to find subarray-%s in %s\n", | |
1444 | subarray, dev); | |
1445 | goto free_super; | |
1446 | } | |
1447 | free(info); | |
1448 | ||
1449 | err = 0; | |
1450 | ||
1451 | free_super: | |
1452 | if (err) | |
1453 | st->ss->free_super(st); | |
1454 | free_name: | |
1455 | if (err) | |
1456 | free(st->devname); | |
1457 | free_sysfs: | |
1458 | sysfs_free(mdi); | |
1459 | close_fd: | |
1460 | if (err) | |
1461 | close(fd); | |
1462 | ||
1463 | if (err) | |
1464 | return -1; | |
1465 | else | |
1466 | return fd; | |
1467 | } | |
1468 | ||
1469 | int add_disk(int mdfd, struct supertype *st, | |
1470 | struct mdinfo *sra, struct mdinfo *info) | |
1471 | { | |
1472 | /* Add a device to an array, in one of 2 ways. */ | |
1473 | int rv; | |
1474 | #ifndef MDASSEMBLE | |
1475 | if (st->ss->external) { | |
1476 | if (info->disk.state & (1<<MD_DISK_SYNC)) | |
1477 | info->recovery_start = MaxSector; | |
1478 | else | |
1479 | info->recovery_start = 0; | |
1480 | rv = sysfs_add_disk(sra, info, 0); | |
1481 | if (! rv) { | |
1482 | struct mdinfo *sd2; | |
1483 | for (sd2 = sra->devs; sd2; sd2=sd2->next) | |
1484 | if (sd2 == info) | |
1485 | break; | |
1486 | if (sd2 == NULL) { | |
1487 | sd2 = malloc(sizeof(*sd2)); | |
1488 | *sd2 = *info; | |
1489 | sd2->next = sra->devs; | |
1490 | sra->devs = sd2; | |
1491 | } | |
1492 | } | |
1493 | } else | |
1494 | #endif | |
1495 | rv = ioctl(mdfd, ADD_NEW_DISK, &info->disk); | |
1496 | return rv; | |
1497 | } | |
1498 | ||
1499 | int remove_disk(int mdfd, struct supertype *st, | |
1500 | struct mdinfo *sra, struct mdinfo *info) | |
1501 | { | |
1502 | int rv; | |
1503 | /* Remove the disk given by 'info' from the array */ | |
1504 | #ifndef MDASSEMBLE | |
1505 | if (st->ss->external) | |
1506 | rv = sysfs_set_str(sra, info, "slot", "none"); | |
1507 | else | |
1508 | #endif | |
1509 | rv = ioctl(mdfd, HOT_REMOVE_DISK, makedev(info->disk.major, | |
1510 | info->disk.minor)); | |
1511 | return rv; | |
1512 | } | |
1513 | ||
1514 | int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info) | |
1515 | { | |
1516 | /* Initialise kernel's knowledge of array. | |
1517 | * This varies between externally managed arrays | |
1518 | * and older kernels | |
1519 | */ | |
1520 | int vers = md_get_version(mdfd); | |
1521 | int rv; | |
1522 | ||
1523 | #ifndef MDASSEMBLE | |
1524 | if (st->ss->external) | |
1525 | rv = sysfs_set_array(info, vers); | |
1526 | else | |
1527 | #endif | |
1528 | if ((vers % 100) >= 1) { /* can use different versions */ | |
1529 | mdu_array_info_t inf; | |
1530 | memset(&inf, 0, sizeof(inf)); | |
1531 | inf.major_version = info->array.major_version; | |
1532 | inf.minor_version = info->array.minor_version; | |
1533 | rv = ioctl(mdfd, SET_ARRAY_INFO, &inf); | |
1534 | } else | |
1535 | rv = ioctl(mdfd, SET_ARRAY_INFO, NULL); | |
1536 | return rv; | |
1537 | } | |
1538 | ||
1539 | unsigned long long min_recovery_start(struct mdinfo *array) | |
1540 | { | |
1541 | /* find the minimum recovery_start in an array for metadata | |
1542 | * formats that only record per-array recovery progress instead | |
1543 | * of per-device | |
1544 | */ | |
1545 | unsigned long long recovery_start = MaxSector; | |
1546 | struct mdinfo *d; | |
1547 | ||
1548 | for (d = array->devs; d; d = d->next) | |
1549 | recovery_start = min(recovery_start, d->recovery_start); | |
1550 | ||
1551 | return recovery_start; | |
1552 | } | |
1553 | ||
1554 | int mdmon_pid(int devnum) | |
1555 | { | |
1556 | char path[100]; | |
1557 | char pid[10]; | |
1558 | int fd; | |
1559 | int n; | |
1560 | char *devname = devnum2devname(devnum); | |
1561 | ||
1562 | sprintf(path, "%s/%s.pid", MDMON_DIR, devname); | |
1563 | free(devname); | |
1564 | ||
1565 | fd = open(path, O_RDONLY | O_NOATIME, 0); | |
1566 | ||
1567 | if (fd < 0) | |
1568 | return -1; | |
1569 | n = read(fd, pid, 9); | |
1570 | close(fd); | |
1571 | if (n <= 0) | |
1572 | return -1; | |
1573 | return atoi(pid); | |
1574 | } | |
1575 | ||
1576 | int mdmon_running(int devnum) | |
1577 | { | |
1578 | int pid = mdmon_pid(devnum); | |
1579 | if (pid <= 0) | |
1580 | return 0; | |
1581 | if (kill(pid, 0) == 0) | |
1582 | return 1; | |
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | int start_mdmon(int devnum) | |
1587 | { | |
1588 | int i, skipped; | |
1589 | int len; | |
1590 | pid_t pid; | |
1591 | int status; | |
1592 | char pathbuf[1024]; | |
1593 | char *paths[4] = { | |
1594 | pathbuf, | |
1595 | "/sbin/mdmon", | |
1596 | "mdmon", | |
1597 | NULL | |
1598 | }; | |
1599 | ||
1600 | if (check_env("MDADM_NO_MDMON")) | |
1601 | return 0; | |
1602 | ||
1603 | len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf)-1); | |
1604 | if (len > 0) { | |
1605 | char *sl; | |
1606 | pathbuf[len] = 0; | |
1607 | sl = strrchr(pathbuf, '/'); | |
1608 | if (sl) | |
1609 | sl++; | |
1610 | else | |
1611 | sl = pathbuf; | |
1612 | strcpy(sl, "mdmon"); | |
1613 | } else | |
1614 | pathbuf[0] = '\0'; | |
1615 | ||
1616 | switch(fork()) { | |
1617 | case 0: | |
1618 | /* FIXME yuk. CLOSE_EXEC?? */ | |
1619 | skipped = 0; | |
1620 | for (i=3; skipped < 20; i++) | |
1621 | if (close(i) < 0) | |
1622 | skipped++; | |
1623 | else | |
1624 | skipped = 0; | |
1625 | ||
1626 | for (i=0; paths[i]; i++) | |
1627 | if (paths[i][0]) { | |
1628 | if (__offroot) { | |
1629 | execl(paths[i], "mdmon", "--offroot", | |
1630 | devnum2devname(devnum), | |
1631 | NULL); | |
1632 | } else { | |
1633 | execl(paths[i], "mdmon", | |
1634 | devnum2devname(devnum), | |
1635 | NULL); | |
1636 | } | |
1637 | } | |
1638 | exit(1); | |
1639 | case -1: fprintf(stderr, Name ": cannot run mdmon. " | |
1640 | "Array remains readonly\n"); | |
1641 | return -1; | |
1642 | default: /* parent - good */ | |
1643 | pid = wait(&status); | |
1644 | if (pid < 0 || status != 0) | |
1645 | return -1; | |
1646 | } | |
1647 | return 0; | |
1648 | } | |
1649 | ||
1650 | int check_env(char *name) | |
1651 | { | |
1652 | char *val = getenv(name); | |
1653 | ||
1654 | if (val && atoi(val) == 1) | |
1655 | return 1; | |
1656 | ||
1657 | return 0; | |
1658 | } | |
1659 | ||
1660 | __u32 random32(void) | |
1661 | { | |
1662 | __u32 rv; | |
1663 | int rfd = open("/dev/urandom", O_RDONLY); | |
1664 | if (rfd < 0 || read(rfd, &rv, 4) != 4) | |
1665 | rv = random(); | |
1666 | if (rfd >= 0) | |
1667 | close(rfd); | |
1668 | return rv; | |
1669 | } | |
1670 | ||
1671 | #ifndef MDASSEMBLE | |
1672 | int flush_metadata_updates(struct supertype *st) | |
1673 | { | |
1674 | int sfd; | |
1675 | if (!st->updates) { | |
1676 | st->update_tail = NULL; | |
1677 | return -1; | |
1678 | } | |
1679 | ||
1680 | sfd = connect_monitor(devnum2devname(st->container_dev)); | |
1681 | if (sfd < 0) | |
1682 | return -1; | |
1683 | ||
1684 | while (st->updates) { | |
1685 | struct metadata_update *mu = st->updates; | |
1686 | st->updates = mu->next; | |
1687 | ||
1688 | send_message(sfd, mu, 0); | |
1689 | wait_reply(sfd, 0); | |
1690 | free(mu->buf); | |
1691 | free(mu); | |
1692 | } | |
1693 | ack(sfd, 0); | |
1694 | wait_reply(sfd, 0); | |
1695 | close(sfd); | |
1696 | st->update_tail = NULL; | |
1697 | return 0; | |
1698 | } | |
1699 | ||
1700 | void append_metadata_update(struct supertype *st, void *buf, int len) | |
1701 | { | |
1702 | ||
1703 | struct metadata_update *mu = malloc(sizeof(*mu)); | |
1704 | ||
1705 | mu->buf = buf; | |
1706 | mu->len = len; | |
1707 | mu->space = NULL; | |
1708 | mu->space_list = NULL; | |
1709 | mu->next = NULL; | |
1710 | *st->update_tail = mu; | |
1711 | st->update_tail = &mu->next; | |
1712 | } | |
1713 | #endif /* MDASSEMBLE */ | |
1714 | ||
1715 | #ifdef __TINYC__ | |
1716 | /* tinyc doesn't optimize this check in ioctl.h out ... */ | |
1717 | unsigned int __invalid_size_argument_for_IOC = 0; | |
1718 | #endif | |
1719 | ||
1720 | int experimental(void) | |
1721 | { | |
1722 | if (check_env("MDADM_EXPERIMENTAL")) | |
1723 | return 1; | |
1724 | else { | |
1725 | fprintf(stderr, Name ": To use this feature MDADM_EXPERIMENTAL" | |
1726 | " environment variable has to be defined.\n"); | |
1727 | return 0; | |
1728 | } | |
1729 | } | |
1730 | ||
1731 | /* Pick all spares matching given criteria from a container | |
1732 | * if min_size == 0 do not check size | |
1733 | * if domlist == NULL do not check domains | |
1734 | * if spare_group given add it to domains of each spare | |
1735 | * metadata allows to test domains using metadata of destination array */ | |
1736 | struct mdinfo *container_choose_spares(struct supertype *st, | |
1737 | unsigned long long min_size, | |
1738 | struct domainlist *domlist, | |
1739 | char *spare_group, | |
1740 | const char *metadata, int get_one) | |
1741 | { | |
1742 | struct mdinfo *d, **dp, *disks = NULL; | |
1743 | ||
1744 | /* get list of all disks in container */ | |
1745 | if (st->ss->getinfo_super_disks) | |
1746 | disks = st->ss->getinfo_super_disks(st); | |
1747 | ||
1748 | if (!disks) | |
1749 | return disks; | |
1750 | /* find spare devices on the list */ | |
1751 | dp = &disks->devs; | |
1752 | disks->array.spare_disks = 0; | |
1753 | while (*dp) { | |
1754 | int found = 0; | |
1755 | d = *dp; | |
1756 | if (d->disk.state == 0) { | |
1757 | /* check if size is acceptable */ | |
1758 | unsigned long long dev_size; | |
1759 | dev_t dev = makedev(d->disk.major,d->disk.minor); | |
1760 | ||
1761 | if (!min_size || | |
1762 | (dev_size_from_id(dev, &dev_size) && | |
1763 | dev_size >= min_size)) | |
1764 | found = 1; | |
1765 | /* check if domain matches */ | |
1766 | if (found && domlist) { | |
1767 | struct dev_policy *pol = devnum_policy(dev); | |
1768 | if (spare_group) | |
1769 | pol_add(&pol, pol_domain, | |
1770 | spare_group, NULL); | |
1771 | if (domain_test(domlist, pol, metadata) != 1) | |
1772 | found = 0; | |
1773 | dev_policy_free(pol); | |
1774 | } | |
1775 | } | |
1776 | if (found) { | |
1777 | dp = &d->next; | |
1778 | disks->array.spare_disks++; | |
1779 | if (get_one) { | |
1780 | sysfs_free(*dp); | |
1781 | d->next = NULL; | |
1782 | } | |
1783 | } else { | |
1784 | *dp = d->next; | |
1785 | d->next = NULL; | |
1786 | sysfs_free(d); | |
1787 | } | |
1788 | } | |
1789 | return disks; | |
1790 | } |