]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001-2013 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 <sys/resource.h> | |
32 | #include <sys/vfs.h> | |
33 | #include <linux/magic.h> | |
34 | #include <ctype.h> | |
35 | #include <dirent.h> | |
36 | #include <signal.h> | |
37 | #include <dlfcn.h> | |
38 | #include <stdint.h> | |
39 | #ifdef NO_COROSYNC | |
40 | typedef uint64_t cmap_handle_t; | |
41 | #define CS_OK 1 | |
42 | #else | |
43 | #include <corosync/cmap.h> | |
44 | #endif | |
45 | ||
46 | ||
47 | /* | |
48 | * following taken from linux/blkpg.h because they aren't | |
49 | * anywhere else and it isn't safe to #include linux/ * stuff. | |
50 | */ | |
51 | ||
52 | #define BLKPG _IO(0x12,105) | |
53 | ||
54 | /* The argument structure */ | |
55 | struct blkpg_ioctl_arg { | |
56 | int op; | |
57 | int flags; | |
58 | int datalen; | |
59 | void *data; | |
60 | }; | |
61 | ||
62 | /* The subfunctions (for the op field) */ | |
63 | #define BLKPG_ADD_PARTITION 1 | |
64 | #define BLKPG_DEL_PARTITION 2 | |
65 | ||
66 | /* Sizes of name fields. Unused at present. */ | |
67 | #define BLKPG_DEVNAMELTH 64 | |
68 | #define BLKPG_VOLNAMELTH 64 | |
69 | ||
70 | /* The data structure for ADD_PARTITION and DEL_PARTITION */ | |
71 | struct blkpg_partition { | |
72 | long long start; /* starting offset in bytes */ | |
73 | long long length; /* length in bytes */ | |
74 | int pno; /* partition number */ | |
75 | char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2, | |
76 | to be used in kernel messages */ | |
77 | char volname[BLKPG_VOLNAMELTH]; /* volume label */ | |
78 | }; | |
79 | ||
80 | #include "part.h" | |
81 | ||
82 | /* Force a compilation error if condition is true */ | |
83 | #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) | |
84 | ||
85 | /* Force a compilation error if condition is true, but also produce a | |
86 | result (of value 0 and type size_t), so the expression can be used | |
87 | e.g. in a structure initializer (or where-ever else comma expressions | |
88 | aren't permitted). */ | |
89 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) | |
90 | ||
91 | /* | |
92 | * Parse a 128 bit uuid in 4 integers | |
93 | * format is 32 hexx nibbles with options :.<space> separator | |
94 | * If not exactly 32 hex digits are found, return 0 | |
95 | * else return 1 | |
96 | */ | |
97 | int parse_uuid(char *str, int uuid[4]) | |
98 | { | |
99 | int hit = 0; /* number of Hex digIT */ | |
100 | int i; | |
101 | char c; | |
102 | for (i = 0; i < 4; i++) | |
103 | uuid[i] = 0; | |
104 | ||
105 | while ((c = *str++) != 0) { | |
106 | int n; | |
107 | if (c >= '0' && c <= '9') | |
108 | n = c-'0'; | |
109 | else if (c >= 'a' && c <= 'f') | |
110 | n = 10 + c - 'a'; | |
111 | else if (c >= 'A' && c <= 'F') | |
112 | n = 10 + c - 'A'; | |
113 | else if (strchr(":. -", c)) | |
114 | continue; | |
115 | else return 0; | |
116 | ||
117 | if (hit<32) { | |
118 | uuid[hit/8] <<= 4; | |
119 | uuid[hit/8] += n; | |
120 | } | |
121 | hit++; | |
122 | } | |
123 | if (hit == 32) | |
124 | return 1; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Get the md version number. | |
130 | * We use the RAID_VERSION ioctl if it is supported | |
131 | * If not, but we have a block device with major '9', we assume | |
132 | * 0.36.0 | |
133 | * | |
134 | * Return version number as 24 but number - assume version parts | |
135 | * always < 255 | |
136 | */ | |
137 | ||
138 | int md_get_version(int fd) | |
139 | { | |
140 | struct stat stb; | |
141 | mdu_version_t vers; | |
142 | ||
143 | if (fstat(fd, &stb)<0) | |
144 | return -1; | |
145 | if ((S_IFMT&stb.st_mode) != S_IFBLK) | |
146 | return -1; | |
147 | ||
148 | if (ioctl(fd, RAID_VERSION, &vers) == 0) | |
149 | return (vers.major*10000) + (vers.minor*100) + vers.patchlevel; | |
150 | if (errno == EACCES) | |
151 | return -1; | |
152 | if (major(stb.st_rdev) == MD_MAJOR) | |
153 | return (3600); | |
154 | return -1; | |
155 | } | |
156 | ||
157 | int get_linux_version() | |
158 | { | |
159 | struct utsname name; | |
160 | char *cp; | |
161 | int a = 0, b = 0,c = 0; | |
162 | if (uname(&name) <0) | |
163 | return -1; | |
164 | ||
165 | cp = name.release; | |
166 | a = strtoul(cp, &cp, 10); | |
167 | if (*cp == '.') | |
168 | b = strtoul(cp+1, &cp, 10); | |
169 | if (*cp == '.') | |
170 | c = strtoul(cp+1, &cp, 10); | |
171 | ||
172 | return (a*1000000)+(b*1000)+c; | |
173 | } | |
174 | ||
175 | #ifndef MDASSEMBLE | |
176 | int mdadm_version(char *version) | |
177 | { | |
178 | int a, b, c; | |
179 | char *cp; | |
180 | ||
181 | if (!version) | |
182 | version = Version; | |
183 | ||
184 | cp = strchr(version, '-'); | |
185 | if (!cp || *(cp+1) != ' ' || *(cp+2) != 'v') | |
186 | return -1; | |
187 | cp += 3; | |
188 | a = strtoul(cp, &cp, 10); | |
189 | if (*cp != '.') | |
190 | return -1; | |
191 | b = strtoul(cp+1, &cp, 10); | |
192 | if (*cp == '.') | |
193 | c = strtoul(cp+1, &cp, 10); | |
194 | else | |
195 | c = 0; | |
196 | if (*cp != ' ' && *cp != '-') | |
197 | return -1; | |
198 | return (a*1000000)+(b*1000)+c; | |
199 | } | |
200 | ||
201 | unsigned long long parse_size(char *size) | |
202 | { | |
203 | /* parse 'size' which should be a number optionally | |
204 | * followed by 'K', 'M', or 'G'. | |
205 | * Without a suffix, K is assumed. | |
206 | * Number returned is in sectors (half-K) | |
207 | * INVALID_SECTORS returned on error. | |
208 | */ | |
209 | char *c; | |
210 | long long s = strtoll(size, &c, 10); | |
211 | if (s > 0) { | |
212 | switch (*c) { | |
213 | case 'K': | |
214 | c++; | |
215 | default: | |
216 | s *= 2; | |
217 | break; | |
218 | case 'M': | |
219 | c++; | |
220 | s *= 1024 * 2; | |
221 | break; | |
222 | case 'G': | |
223 | c++; | |
224 | s *= 1024 * 1024 * 2; | |
225 | break; | |
226 | case 's': /* sectors */ | |
227 | c++; | |
228 | break; | |
229 | } | |
230 | } else | |
231 | s = INVALID_SECTORS; | |
232 | if (*c) | |
233 | s = INVALID_SECTORS; | |
234 | return s; | |
235 | } | |
236 | ||
237 | int parse_layout_10(char *layout) | |
238 | { | |
239 | int copies, rv; | |
240 | char *cp; | |
241 | /* Parse the layout string for raid10 */ | |
242 | /* 'f', 'o' or 'n' followed by a number <= raid_disks */ | |
243 | if ((layout[0] != 'n' && layout[0] != 'f' && layout[0] != 'o') || | |
244 | (copies = strtoul(layout+1, &cp, 10)) < 1 || | |
245 | copies > 200 || | |
246 | *cp) | |
247 | return -1; | |
248 | if (layout[0] == 'n') | |
249 | rv = 256 + copies; | |
250 | else if (layout[0] == 'o') | |
251 | rv = 0x10000 + (copies<<8) + 1; | |
252 | else | |
253 | rv = 1 + (copies<<8); | |
254 | return rv; | |
255 | } | |
256 | ||
257 | int parse_layout_faulty(char *layout) | |
258 | { | |
259 | /* Parse the layout string for 'faulty' */ | |
260 | int ln = strcspn(layout, "0123456789"); | |
261 | char *m = xstrdup(layout); | |
262 | int mode; | |
263 | m[ln] = 0; | |
264 | mode = map_name(faultylayout, m); | |
265 | if (mode == UnSet) | |
266 | return -1; | |
267 | ||
268 | return mode | (atoi(layout+ln)<< ModeShift); | |
269 | } | |
270 | ||
271 | long parse_num(char *num) | |
272 | { | |
273 | /* Either return a valid number, or -1 */ | |
274 | char *c; | |
275 | long rv = strtol(num, &c, 10); | |
276 | if (rv < 0 || *c || !num[0]) | |
277 | return -1; | |
278 | else | |
279 | return rv; | |
280 | } | |
281 | #endif | |
282 | ||
283 | int parse_cluster_confirm_arg(char *input, char **devname, int *slot) | |
284 | { | |
285 | char *dev; | |
286 | *slot = strtoul(input, &dev, 10); | |
287 | if (dev == input || dev[0] != ':') | |
288 | return -1; | |
289 | *devname = dev+1; | |
290 | return 0; | |
291 | } | |
292 | ||
293 | void remove_partitions(int fd) | |
294 | { | |
295 | /* remove partitions from this block devices. | |
296 | * This is used for components added to an array | |
297 | */ | |
298 | #ifdef BLKPG_DEL_PARTITION | |
299 | struct blkpg_ioctl_arg a; | |
300 | struct blkpg_partition p; | |
301 | ||
302 | a.op = BLKPG_DEL_PARTITION; | |
303 | a.data = (void*)&p; | |
304 | a.datalen = sizeof(p); | |
305 | a.flags = 0; | |
306 | memset(a.data, 0, a.datalen); | |
307 | for (p.pno = 0; p.pno < 16; p.pno++) | |
308 | ioctl(fd, BLKPG, &a); | |
309 | #endif | |
310 | } | |
311 | ||
312 | int test_partition(int fd) | |
313 | { | |
314 | /* Check if fd is a whole-disk or a partition. | |
315 | * BLKPG will return EINVAL on a partition, and BLKPG_DEL_PARTITION | |
316 | * will return ENXIO on an invalid partition number. | |
317 | */ | |
318 | struct blkpg_ioctl_arg a; | |
319 | struct blkpg_partition p; | |
320 | a.op = BLKPG_DEL_PARTITION; | |
321 | a.data = (void*)&p; | |
322 | a.datalen = sizeof(p); | |
323 | a.flags = 0; | |
324 | memset(a.data, 0, a.datalen); | |
325 | p.pno = 1<<30; | |
326 | if (ioctl(fd, BLKPG, &a) == 0) | |
327 | /* Very unlikely, but not a partition */ | |
328 | return 0; | |
329 | if (errno == ENXIO || errno == ENOTTY) | |
330 | /* not a partition */ | |
331 | return 0; | |
332 | ||
333 | return 1; | |
334 | } | |
335 | ||
336 | int test_partition_from_id(dev_t id) | |
337 | { | |
338 | char buf[20]; | |
339 | int fd, rv; | |
340 | ||
341 | sprintf(buf, "%d:%d", major(id), minor(id)); | |
342 | fd = dev_open(buf, O_RDONLY); | |
343 | if (fd < 0) | |
344 | return -1; | |
345 | rv = test_partition(fd); | |
346 | close(fd); | |
347 | return rv; | |
348 | } | |
349 | ||
350 | int enough(int level, int raid_disks, int layout, int clean, char *avail) | |
351 | { | |
352 | int copies, first; | |
353 | int i; | |
354 | int avail_disks = 0; | |
355 | ||
356 | for (i = 0; i < raid_disks; i++) | |
357 | avail_disks += !!avail[i]; | |
358 | ||
359 | switch (level) { | |
360 | case 10: | |
361 | /* This is the tricky one - we need to check | |
362 | * which actual disks are present. | |
363 | */ | |
364 | copies = (layout&255)* ((layout>>8) & 255); | |
365 | first = 0; | |
366 | do { | |
367 | /* there must be one of the 'copies' form 'first' */ | |
368 | int n = copies; | |
369 | int cnt = 0; | |
370 | int this = first; | |
371 | while (n--) { | |
372 | if (avail[this]) | |
373 | cnt++; | |
374 | this = (this+1) % raid_disks; | |
375 | } | |
376 | if (cnt == 0) | |
377 | return 0; | |
378 | first = (first+(layout&255)) % raid_disks; | |
379 | } while (first != 0); | |
380 | return 1; | |
381 | ||
382 | case LEVEL_MULTIPATH: | |
383 | return avail_disks>= 1; | |
384 | case LEVEL_LINEAR: | |
385 | case 0: | |
386 | return avail_disks == raid_disks; | |
387 | case 1: | |
388 | return avail_disks >= 1; | |
389 | case 4: | |
390 | if (avail_disks == raid_disks - 1 && | |
391 | !avail[raid_disks - 1]) | |
392 | /* If just the parity device is missing, then we | |
393 | * have enough, even if not clean | |
394 | */ | |
395 | return 1; | |
396 | /* FALL THROUGH */ | |
397 | case 5: | |
398 | if (clean) | |
399 | return avail_disks >= raid_disks-1; | |
400 | else | |
401 | return avail_disks >= raid_disks; | |
402 | case 6: | |
403 | if (clean) | |
404 | return avail_disks >= raid_disks-2; | |
405 | else | |
406 | return avail_disks >= raid_disks; | |
407 | default: | |
408 | return 0; | |
409 | } | |
410 | } | |
411 | ||
412 | int enough_fd(int fd) | |
413 | { | |
414 | struct mdu_array_info_s array; | |
415 | struct mdu_disk_info_s disk; | |
416 | int i, rv; | |
417 | char *avail; | |
418 | ||
419 | if (ioctl(fd, GET_ARRAY_INFO, &array) != 0 || | |
420 | array.raid_disks <= 0) | |
421 | return 0; | |
422 | avail = xcalloc(array.raid_disks, 1); | |
423 | for (i = 0; i < MAX_DISKS && array.nr_disks > 0; i++) { | |
424 | disk.number = i; | |
425 | if (ioctl(fd, GET_DISK_INFO, &disk) != 0) | |
426 | continue; | |
427 | if (disk.major == 0 && disk.minor == 0) | |
428 | continue; | |
429 | array.nr_disks--; | |
430 | ||
431 | if (! (disk.state & (1<<MD_DISK_SYNC))) | |
432 | continue; | |
433 | if (disk.raid_disk < 0 || disk.raid_disk >= array.raid_disks) | |
434 | continue; | |
435 | avail[disk.raid_disk] = 1; | |
436 | } | |
437 | /* This is used on an active array, so assume it is clean */ | |
438 | rv = enough(array.level, array.raid_disks, array.layout, | |
439 | 1, avail); | |
440 | free(avail); | |
441 | return rv; | |
442 | } | |
443 | ||
444 | const int uuid_zero[4] = { 0, 0, 0, 0 }; | |
445 | ||
446 | int same_uuid(int a[4], int b[4], int swapuuid) | |
447 | { | |
448 | if (swapuuid) { | |
449 | /* parse uuids are hostendian. | |
450 | * uuid's from some superblocks are big-ending | |
451 | * if there is a difference, we need to swap.. | |
452 | */ | |
453 | unsigned char *ac = (unsigned char *)a; | |
454 | unsigned char *bc = (unsigned char *)b; | |
455 | int i; | |
456 | for (i = 0; i < 16; i += 4) { | |
457 | if (ac[i+0] != bc[i+3] || | |
458 | ac[i+1] != bc[i+2] || | |
459 | ac[i+2] != bc[i+1] || | |
460 | ac[i+3] != bc[i+0]) | |
461 | return 0; | |
462 | } | |
463 | return 1; | |
464 | } else { | |
465 | if (a[0]==b[0] && | |
466 | a[1]==b[1] && | |
467 | a[2]==b[2] && | |
468 | a[3]==b[3]) | |
469 | return 1; | |
470 | return 0; | |
471 | } | |
472 | } | |
473 | ||
474 | void copy_uuid(void *a, int b[4], int swapuuid) | |
475 | { | |
476 | if (swapuuid) { | |
477 | /* parse uuids are hostendian. | |
478 | * uuid's from some superblocks are big-ending | |
479 | * if there is a difference, we need to swap.. | |
480 | */ | |
481 | unsigned char *ac = (unsigned char *)a; | |
482 | unsigned char *bc = (unsigned char *)b; | |
483 | int i; | |
484 | for (i = 0; i < 16; i += 4) { | |
485 | ac[i+0] = bc[i+3]; | |
486 | ac[i+1] = bc[i+2]; | |
487 | ac[i+2] = bc[i+1]; | |
488 | ac[i+3] = bc[i+0]; | |
489 | } | |
490 | } else | |
491 | memcpy(a, b, 16); | |
492 | } | |
493 | ||
494 | char *__fname_from_uuid(int id[4], int swap, char *buf, char sep) | |
495 | { | |
496 | int i, j; | |
497 | char uuid[16]; | |
498 | char *c = buf; | |
499 | strcpy(c, "UUID-"); | |
500 | c += strlen(c); | |
501 | copy_uuid(uuid, id, swap); | |
502 | for (i = 0; i < 4; i++) { | |
503 | if (i) | |
504 | *c++ = sep; | |
505 | for (j = 3; j >= 0; j--) { | |
506 | sprintf(c,"%02x", (unsigned char) uuid[j+4*i]); | |
507 | c+= 2; | |
508 | } | |
509 | } | |
510 | return buf; | |
511 | ||
512 | } | |
513 | ||
514 | char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep) | |
515 | { | |
516 | // dirty hack to work around an issue with super1 superblocks... | |
517 | // super1 superblocks need swapuuid set in order for assembly to | |
518 | // work, but can't have it set if we want this printout to match | |
519 | // all the other uuid printouts in super1.c, so we force swapuuid | |
520 | // to 1 to make our printout match the rest of super1 | |
521 | return __fname_from_uuid(info->uuid, (st->ss == &super1) ? 1 : st->ss->swapuuid, buf, sep); | |
522 | } | |
523 | ||
524 | #ifndef MDASSEMBLE | |
525 | int check_ext2(int fd, char *name) | |
526 | { | |
527 | /* | |
528 | * Check for an ext2fs file system. | |
529 | * Superblock is always 1K at 1K offset | |
530 | * | |
531 | * s_magic is le16 at 56 == 0xEF53 | |
532 | * report mtime - le32 at 44 | |
533 | * blocks - le32 at 4 | |
534 | * logblksize - le32 at 24 | |
535 | */ | |
536 | unsigned char sb[1024]; | |
537 | time_t mtime; | |
538 | unsigned long long size; | |
539 | int bsize; | |
540 | if (lseek(fd, 1024,0)!= 1024) | |
541 | return 0; | |
542 | if (read(fd, sb, 1024)!= 1024) | |
543 | return 0; | |
544 | if (sb[56] != 0x53 || sb[57] != 0xef) | |
545 | return 0; | |
546 | ||
547 | mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8; | |
548 | bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8; | |
549 | size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8; | |
550 | size <<= bsize; | |
551 | pr_err("%s appears to contain an ext2fs file system\n", | |
552 | name); | |
553 | cont_err("size=%lluK mtime=%s", size, ctime(&mtime)); | |
554 | return 1; | |
555 | } | |
556 | ||
557 | int check_reiser(int fd, char *name) | |
558 | { | |
559 | /* | |
560 | * superblock is at 64K | |
561 | * size is 1024; | |
562 | * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52 | |
563 | * | |
564 | */ | |
565 | unsigned char sb[1024]; | |
566 | unsigned long long size; | |
567 | if (lseek(fd, 64*1024, 0) != 64*1024) | |
568 | return 0; | |
569 | if (read(fd, sb, 1024) != 1024) | |
570 | return 0; | |
571 | if (strncmp((char*)sb+52, "ReIsErFs",8) != 0 && | |
572 | strncmp((char*)sb+52, "ReIsEr2Fs",9) != 0) | |
573 | return 0; | |
574 | pr_err("%s appears to contain a reiserfs file system\n",name); | |
575 | size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8; | |
576 | cont_err("size = %lluK\n", size*4); | |
577 | ||
578 | return 1; | |
579 | } | |
580 | ||
581 | int check_raid(int fd, char *name) | |
582 | { | |
583 | struct mdinfo info; | |
584 | time_t crtime; | |
585 | char *level; | |
586 | struct supertype *st = guess_super(fd); | |
587 | ||
588 | if (!st) | |
589 | return 0; | |
590 | st->ss->load_super(st, fd, name); | |
591 | /* Looks like a raid array .. */ | |
592 | pr_err("%s appears to be part of a raid array:\n", | |
593 | name); | |
594 | st->ss->getinfo_super(st, &info, NULL); | |
595 | st->ss->free_super(st); | |
596 | crtime = info.array.ctime; | |
597 | level = map_num(pers, info.array.level); | |
598 | if (!level) level = "-unknown-"; | |
599 | cont_err("level=%s devices=%d ctime=%s", | |
600 | level, info.array.raid_disks, ctime(&crtime)); | |
601 | return 1; | |
602 | } | |
603 | ||
604 | int ask(char *mesg) | |
605 | { | |
606 | char *add = ""; | |
607 | int i; | |
608 | for (i = 0; i < 5; i++) { | |
609 | char buf[100]; | |
610 | fprintf(stderr, "%s%s", mesg, add); | |
611 | fflush(stderr); | |
612 | if (fgets(buf, 100, stdin)==NULL) | |
613 | return 0; | |
614 | if (buf[0]=='y' || buf[0]=='Y') | |
615 | return 1; | |
616 | if (buf[0]=='n' || buf[0]=='N') | |
617 | return 0; | |
618 | add = "(y/n) "; | |
619 | } | |
620 | pr_err("assuming 'no'\n"); | |
621 | return 0; | |
622 | } | |
623 | #endif /* MDASSEMBLE */ | |
624 | ||
625 | int is_standard(char *dev, int *nump) | |
626 | { | |
627 | /* tests if dev is a "standard" md dev name. | |
628 | * i.e if the last component is "/dNN" or "/mdNN", | |
629 | * where NN is a string of digits | |
630 | * Returns 1 if a partitionable standard, | |
631 | * -1 if non-partitonable, | |
632 | * 0 if not a standard name. | |
633 | */ | |
634 | char *d = strrchr(dev, '/'); | |
635 | int type = 0; | |
636 | int num; | |
637 | if (!d) | |
638 | return 0; | |
639 | if (strncmp(d, "/d",2) == 0) | |
640 | d += 2, type = 1; /* /dev/md/dN{pM} */ | |
641 | else if (strncmp(d, "/md_d", 5) == 0) | |
642 | d += 5, type = 1; /* /dev/md_dN{pM} */ | |
643 | else if (strncmp(d, "/md", 3) == 0) | |
644 | d += 3, type = -1; /* /dev/mdN */ | |
645 | else if (d-dev > 3 && strncmp(d-2, "md/", 3) == 0) | |
646 | d += 1, type = -1; /* /dev/md/N */ | |
647 | else | |
648 | return 0; | |
649 | if (!*d) | |
650 | return 0; | |
651 | num = atoi(d); | |
652 | while (isdigit(*d)) | |
653 | d++; | |
654 | if (*d) | |
655 | return 0; | |
656 | if (nump) *nump = num; | |
657 | ||
658 | return type; | |
659 | } | |
660 | ||
661 | unsigned long calc_csum(void *super, int bytes) | |
662 | { | |
663 | unsigned long long newcsum = 0; | |
664 | int i; | |
665 | unsigned int csum; | |
666 | unsigned int *superc = (unsigned int*) super; | |
667 | ||
668 | for(i = 0; i < bytes/4; i++) | |
669 | newcsum += superc[i]; | |
670 | csum = (newcsum& 0xffffffff) + (newcsum>>32); | |
671 | #ifdef __alpha__ | |
672 | /* The in-kernel checksum calculation is always 16bit on | |
673 | * the alpha, though it is 32 bit on i386... | |
674 | * I wonder what it is elsewhere... (it uses an API in | |
675 | * a way that it shouldn't). | |
676 | */ | |
677 | csum = (csum & 0xffff) + (csum >> 16); | |
678 | csum = (csum & 0xffff) + (csum >> 16); | |
679 | #endif | |
680 | return csum; | |
681 | } | |
682 | ||
683 | #ifndef MDASSEMBLE | |
684 | char *human_size(long long bytes) | |
685 | { | |
686 | static char buf[30]; | |
687 | ||
688 | /* We convert bytes to either centi-M{ega,ibi}bytes or | |
689 | * centi-G{igi,ibi}bytes, with appropriate rounding, | |
690 | * and then print 1/100th of those as a decimal. | |
691 | * We allow upto 2048Megabytes before converting to | |
692 | * gigabytes, as that shows more precision and isn't | |
693 | * too large a number. | |
694 | * Terabytes are not yet handled. | |
695 | */ | |
696 | ||
697 | if (bytes < 5000*1024) | |
698 | buf[0] = 0; | |
699 | else if (bytes < 2*1024LL*1024LL*1024LL) { | |
700 | long cMiB = (bytes * 200LL / (1LL<<20) + 1) / 2; | |
701 | long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2; | |
702 | snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)", | |
703 | cMiB/100 , cMiB % 100, | |
704 | cMB/100, cMB % 100); | |
705 | } else { | |
706 | long cGiB = (bytes * 200LL / (1LL<<30) +1) / 2; | |
707 | long cGB = (bytes / (1000000000LL/200LL ) +1) /2; | |
708 | snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)", | |
709 | cGiB/100 , cGiB % 100, | |
710 | cGB/100, cGB % 100); | |
711 | } | |
712 | return buf; | |
713 | } | |
714 | ||
715 | char *human_size_brief(long long bytes, int prefix) | |
716 | { | |
717 | static char buf[30]; | |
718 | ||
719 | /* We convert bytes to either centi-M{ega,ibi}bytes or | |
720 | * centi-G{igi,ibi}bytes, with appropriate rounding, | |
721 | * and then print 1/100th of those as a decimal. | |
722 | * We allow upto 2048Megabytes before converting to | |
723 | * gigabytes, as that shows more precision and isn't | |
724 | * too large a number. | |
725 | * Terabytes are not yet handled. | |
726 | * | |
727 | * If prefix == IEC, we mean prefixes like kibi,mebi,gibi etc. | |
728 | * If prefix == JEDEC, we mean prefixes like kilo,mega,giga etc. | |
729 | */ | |
730 | ||
731 | if (bytes < 5000*1024) | |
732 | buf[0] = 0; | |
733 | else if (prefix == IEC) { | |
734 | if (bytes < 2*1024LL*1024LL*1024LL) { | |
735 | long cMiB = (bytes * 200LL / (1LL<<20) +1) /2; | |
736 | snprintf(buf, sizeof(buf), "%ld.%02ldMiB", | |
737 | cMiB/100 , cMiB % 100); | |
738 | } else { | |
739 | long cGiB = (bytes * 200LL / (1LL<<30) +1) /2; | |
740 | snprintf(buf, sizeof(buf), "%ld.%02ldGiB", | |
741 | cGiB/100 , cGiB % 100); | |
742 | } | |
743 | } | |
744 | else if (prefix == JEDEC) { | |
745 | if (bytes < 2*1024LL*1024LL*1024LL) { | |
746 | long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2; | |
747 | snprintf(buf, sizeof(buf), "%ld.%02ldMB", | |
748 | cMB/100, cMB % 100); | |
749 | } else { | |
750 | long cGB = (bytes / (1000000000LL/200LL ) +1) /2; | |
751 | snprintf(buf, sizeof(buf), "%ld.%02ldGB", | |
752 | cGB/100 , cGB % 100); | |
753 | } | |
754 | } | |
755 | else | |
756 | buf[0] = 0; | |
757 | ||
758 | return buf; | |
759 | } | |
760 | ||
761 | void print_r10_layout(int layout) | |
762 | { | |
763 | int near = layout & 255; | |
764 | int far = (layout >> 8) & 255; | |
765 | int offset = (layout&0x10000); | |
766 | char *sep = ""; | |
767 | ||
768 | if (near != 1) { | |
769 | printf("%s near=%d", sep, near); | |
770 | sep = ","; | |
771 | } | |
772 | if (far != 1) | |
773 | printf("%s %s=%d", sep, offset?"offset":"far", far); | |
774 | if (near*far == 1) | |
775 | printf("NO REDUNDANCY"); | |
776 | } | |
777 | #endif | |
778 | ||
779 | unsigned long long calc_array_size(int level, int raid_disks, int layout, | |
780 | int chunksize, unsigned long long devsize) | |
781 | { | |
782 | if (level == 1) | |
783 | return devsize; | |
784 | devsize &= ~(unsigned long long)((chunksize>>9)-1); | |
785 | return get_data_disks(level, layout, raid_disks) * devsize; | |
786 | } | |
787 | ||
788 | int get_data_disks(int level, int layout, int raid_disks) | |
789 | { | |
790 | int data_disks = 0; | |
791 | switch (level) { | |
792 | case 0: data_disks = raid_disks; | |
793 | break; | |
794 | case 1: data_disks = 1; | |
795 | break; | |
796 | case 4: | |
797 | case 5: data_disks = raid_disks - 1; | |
798 | break; | |
799 | case 6: data_disks = raid_disks - 2; | |
800 | break; | |
801 | case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255); | |
802 | break; | |
803 | } | |
804 | ||
805 | return data_disks; | |
806 | } | |
807 | ||
808 | int devnm2devid(char *devnm) | |
809 | { | |
810 | /* First look in /sys/block/$DEVNM/dev for %d:%d | |
811 | * If that fails, try parsing out a number | |
812 | */ | |
813 | char path[100]; | |
814 | char *ep; | |
815 | int fd; | |
816 | int mjr,mnr; | |
817 | ||
818 | sprintf(path, "/sys/block/%s/dev", devnm); | |
819 | fd = open(path, O_RDONLY); | |
820 | if (fd >= 0) { | |
821 | char buf[20]; | |
822 | int n = read(fd, buf, sizeof(buf)); | |
823 | close(fd); | |
824 | if (n > 0) | |
825 | buf[n] = 0; | |
826 | if (n > 0 && sscanf(buf, "%d:%d\n", &mjr, &mnr) == 2) | |
827 | return makedev(mjr, mnr); | |
828 | } | |
829 | if (strncmp(devnm, "md_d", 4) == 0 && | |
830 | isdigit(devnm[4]) && | |
831 | (mnr = strtoul(devnm+4, &ep, 10)) >= 0 && | |
832 | ep > devnm && *ep == 0) | |
833 | return makedev(get_mdp_major(), mnr << MdpMinorShift); | |
834 | ||
835 | if (strncmp(devnm, "md", 2) == 0 && | |
836 | isdigit(devnm[2]) && | |
837 | (mnr = strtoul(devnm+2, &ep, 10)) >= 0 && | |
838 | ep > devnm && *ep == 0) | |
839 | return makedev(MD_MAJOR, mnr); | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) | |
845 | char *get_md_name(char *devnm) | |
846 | { | |
847 | /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */ | |
848 | /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */ | |
849 | ||
850 | static char devname[50]; | |
851 | struct stat stb; | |
852 | dev_t rdev = devnm2devid(devnm); | |
853 | char *dn; | |
854 | ||
855 | if (rdev == 0) | |
856 | return 0; | |
857 | if (strncmp(devnm, "md_", 3) == 0) { | |
858 | snprintf(devname, sizeof(devname), "/dev/md/%s", | |
859 | devnm + 3); | |
860 | if (stat(devname, &stb) == 0 | |
861 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
862 | && (stb.st_rdev == rdev)) | |
863 | return devname; | |
864 | } | |
865 | snprintf(devname, sizeof(devname), "/dev/%s", devnm); | |
866 | if (stat(devname, &stb) == 0 | |
867 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
868 | && (stb.st_rdev == rdev)) | |
869 | return devname; | |
870 | ||
871 | snprintf(devname, sizeof(devname), "/dev/md/%s", devnm+2); | |
872 | if (stat(devname, &stb) == 0 | |
873 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
874 | && (stb.st_rdev == rdev)) | |
875 | return devname; | |
876 | ||
877 | dn = map_dev(major(rdev), minor(rdev), 0); | |
878 | if (dn) | |
879 | return dn; | |
880 | snprintf(devname, sizeof(devname), "/dev/.tmp.%s", devnm); | |
881 | if (mknod(devname, S_IFBLK | 0600, rdev) == -1) | |
882 | if (errno != EEXIST) | |
883 | return NULL; | |
884 | ||
885 | if (stat(devname, &stb) == 0 | |
886 | && (S_IFMT&stb.st_mode) == S_IFBLK | |
887 | && (stb.st_rdev == rdev)) | |
888 | return devname; | |
889 | unlink(devname); | |
890 | return NULL; | |
891 | } | |
892 | ||
893 | void put_md_name(char *name) | |
894 | { | |
895 | if (strncmp(name, "/dev/.tmp.md", 12) == 0) | |
896 | unlink(name); | |
897 | } | |
898 | #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */ | |
899 | ||
900 | int get_maj_min(char *dev, int *major, int *minor) | |
901 | { | |
902 | char *e; | |
903 | *major = strtoul(dev, &e, 0); | |
904 | return (e > dev && *e == ':' && e[1] && | |
905 | (*minor = strtoul(e+1, &e, 0)) >= 0 && | |
906 | *e == 0); | |
907 | } | |
908 | ||
909 | int dev_open(char *dev, int flags) | |
910 | { | |
911 | /* like 'open', but if 'dev' matches %d:%d, create a temp | |
912 | * block device and open that | |
913 | */ | |
914 | int fd = -1; | |
915 | char devname[32]; | |
916 | int major; | |
917 | int minor; | |
918 | ||
919 | if (!dev) return -1; | |
920 | flags |= O_DIRECT; | |
921 | ||
922 | if (get_maj_min(dev, &major, &minor)) { | |
923 | snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d:%d", | |
924 | (int)getpid(), major, minor); | |
925 | if (mknod(devname, S_IFBLK|0600, makedev(major, minor)) == 0) { | |
926 | fd = open(devname, flags); | |
927 | unlink(devname); | |
928 | } | |
929 | if (fd < 0) { | |
930 | /* Try /tmp as /dev appear to be read-only */ | |
931 | snprintf(devname, sizeof(devname), "/tmp/.tmp.md.%d:%d:%d", | |
932 | (int)getpid(), major, minor); | |
933 | if (mknod(devname, S_IFBLK|0600, makedev(major, minor)) == 0) { | |
934 | fd = open(devname, flags); | |
935 | unlink(devname); | |
936 | } | |
937 | } | |
938 | } else | |
939 | fd = open(dev, flags); | |
940 | return fd; | |
941 | } | |
942 | ||
943 | int open_dev_flags(char *devnm, int flags) | |
944 | { | |
945 | int devid; | |
946 | char buf[20]; | |
947 | ||
948 | devid = devnm2devid(devnm); | |
949 | sprintf(buf, "%d:%d", major(devid), minor(devid)); | |
950 | return dev_open(buf, flags); | |
951 | } | |
952 | ||
953 | int open_dev(char *devnm) | |
954 | { | |
955 | return open_dev_flags(devnm, O_RDONLY); | |
956 | } | |
957 | ||
958 | int open_dev_excl(char *devnm) | |
959 | { | |
960 | char buf[20]; | |
961 | int i; | |
962 | int flags = O_RDWR; | |
963 | int devid = devnm2devid(devnm); | |
964 | long delay = 1000; | |
965 | ||
966 | sprintf(buf, "%d:%d", major(devid), minor(devid)); | |
967 | for (i = 0 ; i < 25 ; i++) { | |
968 | int fd = dev_open(buf, flags|O_EXCL); | |
969 | if (fd >= 0) | |
970 | return fd; | |
971 | if (errno == EACCES && flags == O_RDWR) { | |
972 | flags = O_RDONLY; | |
973 | continue; | |
974 | } | |
975 | if (errno != EBUSY) | |
976 | return fd; | |
977 | usleep(delay); | |
978 | if (delay < 200000) | |
979 | delay *= 2; | |
980 | } | |
981 | return -1; | |
982 | } | |
983 | ||
984 | int same_dev(char *one, char *two) | |
985 | { | |
986 | struct stat st1, st2; | |
987 | if (stat(one, &st1) != 0) | |
988 | return 0; | |
989 | if (stat(two, &st2) != 0) | |
990 | return 0; | |
991 | if ((st1.st_mode & S_IFMT) != S_IFBLK) | |
992 | return 0; | |
993 | if ((st2.st_mode & S_IFMT) != S_IFBLK) | |
994 | return 0; | |
995 | return st1.st_rdev == st2.st_rdev; | |
996 | } | |
997 | ||
998 | void wait_for(char *dev, int fd) | |
999 | { | |
1000 | int i; | |
1001 | struct stat stb_want; | |
1002 | long delay = 1000; | |
1003 | ||
1004 | if (fstat(fd, &stb_want) != 0 || | |
1005 | (stb_want.st_mode & S_IFMT) != S_IFBLK) | |
1006 | return; | |
1007 | ||
1008 | for (i = 0 ; i < 25 ; i++) { | |
1009 | struct stat stb; | |
1010 | if (stat(dev, &stb) == 0 && | |
1011 | (stb.st_mode & S_IFMT) == S_IFBLK && | |
1012 | (stb.st_rdev == stb_want.st_rdev)) | |
1013 | return; | |
1014 | usleep(delay); | |
1015 | if (delay < 200000) | |
1016 | delay *= 2; | |
1017 | } | |
1018 | if (i == 25) | |
1019 | dprintf("timeout waiting for %s\n", dev); | |
1020 | } | |
1021 | ||
1022 | struct superswitch *superlist[] = | |
1023 | { | |
1024 | &super0, &super1, | |
1025 | &super_ddf, &super_imsm, | |
1026 | &mbr, &gpt, | |
1027 | NULL }; | |
1028 | ||
1029 | #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) | |
1030 | ||
1031 | struct supertype *super_by_fd(int fd, char **subarrayp) | |
1032 | { | |
1033 | mdu_array_info_t array; | |
1034 | int vers; | |
1035 | int minor; | |
1036 | struct supertype *st = NULL; | |
1037 | struct mdinfo *sra; | |
1038 | char *verstr; | |
1039 | char version[20]; | |
1040 | int i; | |
1041 | char *subarray = NULL; | |
1042 | char container[32] = ""; | |
1043 | ||
1044 | sra = sysfs_read(fd, NULL, GET_VERSION); | |
1045 | ||
1046 | if (sra) { | |
1047 | vers = sra->array.major_version; | |
1048 | minor = sra->array.minor_version; | |
1049 | verstr = sra->text_version; | |
1050 | } else { | |
1051 | if (ioctl(fd, GET_ARRAY_INFO, &array)) | |
1052 | array.major_version = array.minor_version = 0; | |
1053 | vers = array.major_version; | |
1054 | minor = array.minor_version; | |
1055 | verstr = ""; | |
1056 | } | |
1057 | ||
1058 | if (vers != -1) { | |
1059 | sprintf(version, "%d.%d", vers, minor); | |
1060 | verstr = version; | |
1061 | } | |
1062 | if (minor == -2 && is_subarray(verstr)) { | |
1063 | char *dev = verstr+1; | |
1064 | ||
1065 | subarray = strchr(dev, '/'); | |
1066 | if (subarray) { | |
1067 | *subarray++ = '\0'; | |
1068 | subarray = xstrdup(subarray); | |
1069 | } | |
1070 | strcpy(container, dev); | |
1071 | if (sra) | |
1072 | sysfs_free(sra); | |
1073 | sra = sysfs_read(-1, container, GET_VERSION); | |
1074 | if (sra && sra->text_version[0]) | |
1075 | verstr = sra->text_version; | |
1076 | else | |
1077 | verstr = "-no-metadata-"; | |
1078 | } | |
1079 | ||
1080 | for (i = 0; st == NULL && superlist[i] ; i++) | |
1081 | st = superlist[i]->match_metadata_desc(verstr); | |
1082 | ||
1083 | if (sra) | |
1084 | sysfs_free(sra); | |
1085 | if (st) { | |
1086 | st->sb = NULL; | |
1087 | if (subarrayp) | |
1088 | *subarrayp = subarray; | |
1089 | strcpy(st->container_devnm, container); | |
1090 | strcpy(st->devnm, fd2devnm(fd)); | |
1091 | } else | |
1092 | free(subarray); | |
1093 | ||
1094 | return st; | |
1095 | } | |
1096 | #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */ | |
1097 | ||
1098 | int dev_size_from_id(dev_t id, unsigned long long *size) | |
1099 | { | |
1100 | char buf[20]; | |
1101 | int fd; | |
1102 | ||
1103 | sprintf(buf, "%d:%d", major(id), minor(id)); | |
1104 | fd = dev_open(buf, O_RDONLY); | |
1105 | if (fd < 0) | |
1106 | return 0; | |
1107 | if (get_dev_size(fd, NULL, size)) { | |
1108 | close(fd); | |
1109 | return 1; | |
1110 | } | |
1111 | close(fd); | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | struct supertype *dup_super(struct supertype *orig) | |
1116 | { | |
1117 | struct supertype *st; | |
1118 | ||
1119 | if (!orig) | |
1120 | return orig; | |
1121 | st = xcalloc(1, sizeof(*st)); | |
1122 | st->ss = orig->ss; | |
1123 | st->max_devs = orig->max_devs; | |
1124 | st->minor_version = orig->minor_version; | |
1125 | st->ignore_hw_compat = orig->ignore_hw_compat; | |
1126 | st->data_offset = orig->data_offset; | |
1127 | st->sb = NULL; | |
1128 | st->info = NULL; | |
1129 | return st; | |
1130 | } | |
1131 | ||
1132 | struct supertype *guess_super_type(int fd, enum guess_types guess_type) | |
1133 | { | |
1134 | /* try each load_super to find the best match, | |
1135 | * and return the best superswitch | |
1136 | */ | |
1137 | struct superswitch *ss; | |
1138 | struct supertype *st; | |
1139 | time_t besttime = 0; | |
1140 | int bestsuper = -1; | |
1141 | int i; | |
1142 | ||
1143 | st = xcalloc(1, sizeof(*st)); | |
1144 | st->container_devnm[0] = 0; | |
1145 | ||
1146 | for (i = 0 ; superlist[i]; i++) { | |
1147 | int rv; | |
1148 | ss = superlist[i]; | |
1149 | if (guess_type == guess_array && ss->add_to_super == NULL) | |
1150 | continue; | |
1151 | if (guess_type == guess_partitions && ss->add_to_super != NULL) | |
1152 | continue; | |
1153 | memset(st, 0, sizeof(*st)); | |
1154 | st->ignore_hw_compat = 1; | |
1155 | rv = ss->load_super(st, fd, NULL); | |
1156 | if (rv == 0) { | |
1157 | struct mdinfo info; | |
1158 | st->ss->getinfo_super(st, &info, NULL); | |
1159 | if (bestsuper == -1 || | |
1160 | besttime < info.array.ctime) { | |
1161 | bestsuper = i; | |
1162 | besttime = info.array.ctime; | |
1163 | } | |
1164 | ss->free_super(st); | |
1165 | } | |
1166 | } | |
1167 | if (bestsuper != -1) { | |
1168 | int rv; | |
1169 | memset(st, 0, sizeof(*st)); | |
1170 | st->ignore_hw_compat = 1; | |
1171 | rv = superlist[bestsuper]->load_super(st, fd, NULL); | |
1172 | if (rv == 0) { | |
1173 | superlist[bestsuper]->free_super(st); | |
1174 | return st; | |
1175 | } | |
1176 | } | |
1177 | free(st); | |
1178 | return NULL; | |
1179 | } | |
1180 | ||
1181 | /* Return size of device in bytes */ | |
1182 | int get_dev_size(int fd, char *dname, unsigned long long *sizep) | |
1183 | { | |
1184 | unsigned long long ldsize; | |
1185 | struct stat st; | |
1186 | ||
1187 | if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode)) | |
1188 | ldsize = (unsigned long long)st.st_size; | |
1189 | else | |
1190 | #ifdef BLKGETSIZE64 | |
1191 | if (ioctl(fd, BLKGETSIZE64, &ldsize) != 0) | |
1192 | #endif | |
1193 | { | |
1194 | unsigned long dsize; | |
1195 | if (ioctl(fd, BLKGETSIZE, &dsize) == 0) { | |
1196 | ldsize = dsize; | |
1197 | ldsize <<= 9; | |
1198 | } else { | |
1199 | if (dname) | |
1200 | pr_err("Cannot get size of %s: %s\b", | |
1201 | dname, strerror(errno)); | |
1202 | return 0; | |
1203 | } | |
1204 | } | |
1205 | *sizep = ldsize; | |
1206 | return 1; | |
1207 | } | |
1208 | ||
1209 | /* Return true if this can only be a container, not a member device. | |
1210 | * i.e. is and md device and size is zero | |
1211 | */ | |
1212 | int must_be_container(int fd) | |
1213 | { | |
1214 | unsigned long long size; | |
1215 | if (md_get_version(fd) < 0) | |
1216 | return 0; | |
1217 | if (get_dev_size(fd, NULL, &size) == 0) | |
1218 | return 1; | |
1219 | if (size == 0) | |
1220 | return 1; | |
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | /* Sets endofpart parameter to the last block used by the last GPT partition on the device. | |
1225 | * Returns: 1 if successful | |
1226 | * -1 for unknown partition type | |
1227 | * 0 for other errors | |
1228 | */ | |
1229 | static int get_gpt_last_partition_end(int fd, unsigned long long *endofpart) | |
1230 | { | |
1231 | struct GPT gpt; | |
1232 | unsigned char empty_gpt_entry[16]= {0}; | |
1233 | struct GPT_part_entry *part; | |
1234 | char buf[512]; | |
1235 | unsigned long long curr_part_end; | |
1236 | unsigned all_partitions, entry_size; | |
1237 | unsigned part_nr; | |
1238 | ||
1239 | *endofpart = 0; | |
1240 | ||
1241 | BUILD_BUG_ON(sizeof(gpt) != 512); | |
1242 | /* skip protective MBR */ | |
1243 | lseek(fd, 512, SEEK_SET); | |
1244 | /* read GPT header */ | |
1245 | if (read(fd, &gpt, 512) != 512) | |
1246 | return 0; | |
1247 | ||
1248 | /* get the number of partition entries and the entry size */ | |
1249 | all_partitions = __le32_to_cpu(gpt.part_cnt); | |
1250 | entry_size = __le32_to_cpu(gpt.part_size); | |
1251 | ||
1252 | /* Check GPT signature*/ | |
1253 | if (gpt.magic != GPT_SIGNATURE_MAGIC) | |
1254 | return -1; | |
1255 | ||
1256 | /* sanity checks */ | |
1257 | if (all_partitions > 1024 || | |
1258 | entry_size > sizeof(buf)) | |
1259 | return -1; | |
1260 | ||
1261 | part = (struct GPT_part_entry *)buf; | |
1262 | ||
1263 | for (part_nr = 0; part_nr < all_partitions; part_nr++) { | |
1264 | /* read partition entry */ | |
1265 | if (read(fd, buf, entry_size) != (ssize_t)entry_size) | |
1266 | return 0; | |
1267 | ||
1268 | /* is this valid partition? */ | |
1269 | if (memcmp(part->type_guid, empty_gpt_entry, 16) != 0) { | |
1270 | /* check the last lba for the current partition */ | |
1271 | curr_part_end = __le64_to_cpu(part->ending_lba); | |
1272 | if (curr_part_end > *endofpart) | |
1273 | *endofpart = curr_part_end; | |
1274 | } | |
1275 | ||
1276 | } | |
1277 | return 1; | |
1278 | } | |
1279 | ||
1280 | /* Sets endofpart parameter to the last block used by the last partition on the device. | |
1281 | * Returns: 1 if successful | |
1282 | * -1 for unknown partition type | |
1283 | * 0 for other errors | |
1284 | */ | |
1285 | static int get_last_partition_end(int fd, unsigned long long *endofpart) | |
1286 | { | |
1287 | struct MBR boot_sect; | |
1288 | struct MBR_part_record *part; | |
1289 | unsigned long long curr_part_end; | |
1290 | unsigned part_nr; | |
1291 | int retval = 0; | |
1292 | ||
1293 | *endofpart = 0; | |
1294 | ||
1295 | BUILD_BUG_ON(sizeof(boot_sect) != 512); | |
1296 | /* read MBR */ | |
1297 | lseek(fd, 0, 0); | |
1298 | if (read(fd, &boot_sect, 512) != 512) | |
1299 | goto abort; | |
1300 | ||
1301 | /* check MBP signature */ | |
1302 | if (boot_sect.magic == MBR_SIGNATURE_MAGIC) { | |
1303 | retval = 1; | |
1304 | /* found the correct signature */ | |
1305 | part = boot_sect.parts; | |
1306 | ||
1307 | for (part_nr = 0; part_nr < MBR_PARTITIONS; part_nr++) { | |
1308 | /* check for GPT type */ | |
1309 | if (part->part_type == MBR_GPT_PARTITION_TYPE) { | |
1310 | retval = get_gpt_last_partition_end(fd, endofpart); | |
1311 | break; | |
1312 | } | |
1313 | /* check the last used lba for the current partition */ | |
1314 | curr_part_end = __le32_to_cpu(part->first_sect_lba) + | |
1315 | __le32_to_cpu(part->blocks_num); | |
1316 | if (curr_part_end > *endofpart) | |
1317 | *endofpart = curr_part_end; | |
1318 | ||
1319 | part++; | |
1320 | } | |
1321 | } else { | |
1322 | /* Unknown partition table */ | |
1323 | retval = -1; | |
1324 | } | |
1325 | abort: | |
1326 | return retval; | |
1327 | } | |
1328 | ||
1329 | int check_partitions(int fd, char *dname, unsigned long long freesize, | |
1330 | unsigned long long size) | |
1331 | { | |
1332 | /* | |
1333 | * Check where the last partition ends | |
1334 | */ | |
1335 | unsigned long long endofpart; | |
1336 | int ret; | |
1337 | ||
1338 | if ((ret = get_last_partition_end(fd, &endofpart)) > 0) { | |
1339 | /* There appears to be a partition table here */ | |
1340 | if (freesize == 0) { | |
1341 | /* partitions will not be visible in new device */ | |
1342 | pr_err("partition table exists on %s but will be lost or\n" | |
1343 | " meaningless after creating array\n", | |
1344 | dname); | |
1345 | return 1; | |
1346 | } else if (endofpart > freesize) { | |
1347 | /* last partition overlaps metadata */ | |
1348 | pr_err("metadata will over-write last partition on %s.\n", | |
1349 | dname); | |
1350 | return 1; | |
1351 | } else if (size && endofpart > size) { | |
1352 | /* partitions will be truncated in new device */ | |
1353 | pr_err("array size is too small to cover all partitions on %s.\n", | |
1354 | dname); | |
1355 | return 1; | |
1356 | } | |
1357 | } | |
1358 | return 0; | |
1359 | } | |
1360 | ||
1361 | int open_container(int fd) | |
1362 | { | |
1363 | /* 'fd' is a block device. Find out if it is in use | |
1364 | * by a container, and return an open fd on that container. | |
1365 | */ | |
1366 | char path[256]; | |
1367 | char *e; | |
1368 | DIR *dir; | |
1369 | struct dirent *de; | |
1370 | int dfd, n; | |
1371 | char buf[200]; | |
1372 | int major, minor; | |
1373 | struct stat st; | |
1374 | ||
1375 | if (fstat(fd, &st) != 0) | |
1376 | return -1; | |
1377 | sprintf(path, "/sys/dev/block/%d:%d/holders", | |
1378 | (int)major(st.st_rdev), (int)minor(st.st_rdev)); | |
1379 | e = path + strlen(path); | |
1380 | ||
1381 | dir = opendir(path); | |
1382 | if (!dir) | |
1383 | return -1; | |
1384 | while ((de = readdir(dir))) { | |
1385 | if (de->d_ino == 0) | |
1386 | continue; | |
1387 | if (de->d_name[0] == '.') | |
1388 | continue; | |
1389 | /* Need to make sure it is a container and not a volume */ | |
1390 | sprintf(e, "/%s/md/metadata_version", de->d_name); | |
1391 | dfd = open(path, O_RDONLY); | |
1392 | if (dfd < 0) | |
1393 | continue; | |
1394 | n = read(dfd, buf, sizeof(buf)); | |
1395 | close(dfd); | |
1396 | if (n <= 0 || (unsigned)n >= sizeof(buf)) | |
1397 | continue; | |
1398 | buf[n] = 0; | |
1399 | if (strncmp(buf, "external", 8) != 0 || | |
1400 | n < 10 || | |
1401 | buf[9] == '/') | |
1402 | continue; | |
1403 | sprintf(e, "/%s/dev", de->d_name); | |
1404 | dfd = open(path, O_RDONLY); | |
1405 | if (dfd < 0) | |
1406 | continue; | |
1407 | n = read(dfd, buf, sizeof(buf)); | |
1408 | close(dfd); | |
1409 | if (n <= 0 || (unsigned)n >= sizeof(buf)) | |
1410 | continue; | |
1411 | buf[n] = 0; | |
1412 | if (sscanf(buf, "%d:%d", &major, &minor) != 2) | |
1413 | continue; | |
1414 | sprintf(buf, "%d:%d", major, minor); | |
1415 | dfd = dev_open(buf, O_RDONLY); | |
1416 | if (dfd >= 0) { | |
1417 | closedir(dir); | |
1418 | return dfd; | |
1419 | } | |
1420 | } | |
1421 | closedir(dir); | |
1422 | return -1; | |
1423 | } | |
1424 | ||
1425 | struct superswitch *version_to_superswitch(char *vers) | |
1426 | { | |
1427 | int i; | |
1428 | ||
1429 | for (i = 0; superlist[i]; i++) { | |
1430 | struct superswitch *ss = superlist[i]; | |
1431 | ||
1432 | if (strcmp(vers, ss->name) == 0) | |
1433 | return ss; | |
1434 | } | |
1435 | ||
1436 | return NULL; | |
1437 | } | |
1438 | ||
1439 | int metadata_container_matches(char *metadata, char *devnm) | |
1440 | { | |
1441 | /* Check if 'devnm' is the container named in 'metadata' | |
1442 | * which is | |
1443 | * /containername/componentname or | |
1444 | * -containername/componentname | |
1445 | */ | |
1446 | int l; | |
1447 | if (*metadata != '/' && *metadata != '-') | |
1448 | return 0; | |
1449 | l = strlen(devnm); | |
1450 | if (strncmp(metadata+1, devnm, l) != 0) | |
1451 | return 0; | |
1452 | if (metadata[l+1] != '/') | |
1453 | return 0; | |
1454 | return 1; | |
1455 | } | |
1456 | ||
1457 | int metadata_subdev_matches(char *metadata, char *devnm) | |
1458 | { | |
1459 | /* Check if 'devnm' is the subdev named in 'metadata' | |
1460 | * which is | |
1461 | * /containername/subdev or | |
1462 | * -containername/subdev | |
1463 | */ | |
1464 | char *sl; | |
1465 | if (*metadata != '/' && *metadata != '-') | |
1466 | return 0; | |
1467 | sl = strchr(metadata+1, '/'); | |
1468 | if (!sl) | |
1469 | return 0; | |
1470 | if (strcmp(sl+1, devnm) == 0) | |
1471 | return 1; | |
1472 | return 0; | |
1473 | } | |
1474 | ||
1475 | int is_container_member(struct mdstat_ent *mdstat, char *container) | |
1476 | { | |
1477 | if (mdstat->metadata_version == NULL || | |
1478 | strncmp(mdstat->metadata_version, "external:", 9) != 0 || | |
1479 | !metadata_container_matches(mdstat->metadata_version+9, container)) | |
1480 | return 0; | |
1481 | ||
1482 | return 1; | |
1483 | } | |
1484 | ||
1485 | int is_subarray_active(char *subarray, char *container) | |
1486 | { | |
1487 | struct mdstat_ent *mdstat = mdstat_read(0, 0); | |
1488 | struct mdstat_ent *ent; | |
1489 | ||
1490 | for (ent = mdstat; ent; ent = ent->next) | |
1491 | if (is_container_member(ent, container)) | |
1492 | if (strcmp(to_subarray(ent, container), subarray) == 0) | |
1493 | break; | |
1494 | ||
1495 | free_mdstat(mdstat); | |
1496 | ||
1497 | return ent != NULL; | |
1498 | } | |
1499 | ||
1500 | /* open_subarray - opens a subarray in a container | |
1501 | * @dev: container device name | |
1502 | * @st: empty supertype | |
1503 | * @quiet: block reporting errors flag | |
1504 | * | |
1505 | * On success returns an fd to a container and fills in *st | |
1506 | */ | |
1507 | int open_subarray(char *dev, char *subarray, struct supertype *st, int quiet) | |
1508 | { | |
1509 | struct mdinfo *mdi; | |
1510 | struct mdinfo *info; | |
1511 | int fd, err = 1; | |
1512 | char *_devnm; | |
1513 | ||
1514 | fd = open(dev, O_RDWR|O_EXCL); | |
1515 | if (fd < 0) { | |
1516 | if (!quiet) | |
1517 | pr_err("Couldn't open %s, aborting\n", | |
1518 | dev); | |
1519 | return -1; | |
1520 | } | |
1521 | ||
1522 | _devnm = fd2devnm(fd); | |
1523 | if (_devnm == NULL) { | |
1524 | if (!quiet) | |
1525 | pr_err("Failed to determine device number for %s\n", | |
1526 | dev); | |
1527 | goto close_fd; | |
1528 | } | |
1529 | strcpy(st->devnm, _devnm); | |
1530 | ||
1531 | mdi = sysfs_read(fd, st->devnm, GET_VERSION|GET_LEVEL); | |
1532 | if (!mdi) { | |
1533 | if (!quiet) | |
1534 | pr_err("Failed to read sysfs for %s\n", | |
1535 | dev); | |
1536 | goto close_fd; | |
1537 | } | |
1538 | ||
1539 | if (mdi->array.level != UnSet) { | |
1540 | if (!quiet) | |
1541 | pr_err("%s is not a container\n", dev); | |
1542 | goto free_sysfs; | |
1543 | } | |
1544 | ||
1545 | st->ss = version_to_superswitch(mdi->text_version); | |
1546 | if (!st->ss) { | |
1547 | if (!quiet) | |
1548 | pr_err("Operation not supported for %s metadata\n", | |
1549 | mdi->text_version); | |
1550 | goto free_sysfs; | |
1551 | } | |
1552 | ||
1553 | if (st->devnm[0] == 0) { | |
1554 | if (!quiet) | |
1555 | pr_err("Failed to allocate device name\n"); | |
1556 | goto free_sysfs; | |
1557 | } | |
1558 | ||
1559 | if (!st->ss->load_container) { | |
1560 | if (!quiet) | |
1561 | pr_err("%s is not a container\n", dev); | |
1562 | goto free_sysfs; | |
1563 | } | |
1564 | ||
1565 | if (st->ss->load_container(st, fd, NULL)) { | |
1566 | if (!quiet) | |
1567 | pr_err("Failed to load metadata for %s\n", | |
1568 | dev); | |
1569 | goto free_sysfs; | |
1570 | } | |
1571 | ||
1572 | info = st->ss->container_content(st, subarray); | |
1573 | if (!info) { | |
1574 | if (!quiet) | |
1575 | pr_err("Failed to find subarray-%s in %s\n", | |
1576 | subarray, dev); | |
1577 | goto free_super; | |
1578 | } | |
1579 | free(info); | |
1580 | ||
1581 | err = 0; | |
1582 | ||
1583 | free_super: | |
1584 | if (err) | |
1585 | st->ss->free_super(st); | |
1586 | free_sysfs: | |
1587 | sysfs_free(mdi); | |
1588 | close_fd: | |
1589 | if (err) | |
1590 | close(fd); | |
1591 | ||
1592 | if (err) | |
1593 | return -1; | |
1594 | else | |
1595 | return fd; | |
1596 | } | |
1597 | ||
1598 | int add_disk(int mdfd, struct supertype *st, | |
1599 | struct mdinfo *sra, struct mdinfo *info) | |
1600 | { | |
1601 | /* Add a device to an array, in one of 2 ways. */ | |
1602 | int rv; | |
1603 | #ifndef MDASSEMBLE | |
1604 | if (st->ss->external) { | |
1605 | if (info->disk.state & (1<<MD_DISK_SYNC)) | |
1606 | info->recovery_start = MaxSector; | |
1607 | else | |
1608 | info->recovery_start = 0; | |
1609 | rv = sysfs_add_disk(sra, info, 0); | |
1610 | if (! rv) { | |
1611 | struct mdinfo *sd2; | |
1612 | for (sd2 = sra->devs; sd2; sd2=sd2->next) | |
1613 | if (sd2 == info) | |
1614 | break; | |
1615 | if (sd2 == NULL) { | |
1616 | sd2 = xmalloc(sizeof(*sd2)); | |
1617 | *sd2 = *info; | |
1618 | sd2->next = sra->devs; | |
1619 | sra->devs = sd2; | |
1620 | } | |
1621 | } | |
1622 | } else | |
1623 | #endif | |
1624 | rv = ioctl(mdfd, ADD_NEW_DISK, &info->disk); | |
1625 | return rv; | |
1626 | } | |
1627 | ||
1628 | int remove_disk(int mdfd, struct supertype *st, | |
1629 | struct mdinfo *sra, struct mdinfo *info) | |
1630 | { | |
1631 | int rv; | |
1632 | /* Remove the disk given by 'info' from the array */ | |
1633 | #ifndef MDASSEMBLE | |
1634 | if (st->ss->external) | |
1635 | rv = sysfs_set_str(sra, info, "slot", "none"); | |
1636 | else | |
1637 | #endif | |
1638 | rv = ioctl(mdfd, HOT_REMOVE_DISK, makedev(info->disk.major, | |
1639 | info->disk.minor)); | |
1640 | return rv; | |
1641 | } | |
1642 | ||
1643 | int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info) | |
1644 | { | |
1645 | /* Initialise kernel's knowledge of array. | |
1646 | * This varies between externally managed arrays | |
1647 | * and older kernels | |
1648 | */ | |
1649 | int vers = md_get_version(mdfd); | |
1650 | int rv; | |
1651 | ||
1652 | #ifndef MDASSEMBLE | |
1653 | if (st->ss->external) | |
1654 | rv = sysfs_set_array(info, vers); | |
1655 | else | |
1656 | #endif | |
1657 | if ((vers % 100) >= 1) { /* can use different versions */ | |
1658 | mdu_array_info_t inf; | |
1659 | memset(&inf, 0, sizeof(inf)); | |
1660 | inf.major_version = info->array.major_version; | |
1661 | inf.minor_version = info->array.minor_version; | |
1662 | rv = ioctl(mdfd, SET_ARRAY_INFO, &inf); | |
1663 | } else | |
1664 | rv = ioctl(mdfd, SET_ARRAY_INFO, NULL); | |
1665 | return rv; | |
1666 | } | |
1667 | ||
1668 | unsigned long long min_recovery_start(struct mdinfo *array) | |
1669 | { | |
1670 | /* find the minimum recovery_start in an array for metadata | |
1671 | * formats that only record per-array recovery progress instead | |
1672 | * of per-device | |
1673 | */ | |
1674 | unsigned long long recovery_start = MaxSector; | |
1675 | struct mdinfo *d; | |
1676 | ||
1677 | for (d = array->devs; d; d = d->next) | |
1678 | recovery_start = min(recovery_start, d->recovery_start); | |
1679 | ||
1680 | return recovery_start; | |
1681 | } | |
1682 | ||
1683 | int mdmon_pid(char *devnm) | |
1684 | { | |
1685 | char path[100]; | |
1686 | char pid[10]; | |
1687 | int fd; | |
1688 | int n; | |
1689 | ||
1690 | sprintf(path, "%s/%s.pid", MDMON_DIR, devnm); | |
1691 | ||
1692 | fd = open(path, O_RDONLY | O_NOATIME, 0); | |
1693 | ||
1694 | if (fd < 0) | |
1695 | return -1; | |
1696 | n = read(fd, pid, 9); | |
1697 | close(fd); | |
1698 | if (n <= 0) | |
1699 | return -1; | |
1700 | return atoi(pid); | |
1701 | } | |
1702 | ||
1703 | int mdmon_running(char *devnm) | |
1704 | { | |
1705 | int pid = mdmon_pid(devnm); | |
1706 | if (pid <= 0) | |
1707 | return 0; | |
1708 | if (kill(pid, 0) == 0) | |
1709 | return 1; | |
1710 | return 0; | |
1711 | } | |
1712 | ||
1713 | int start_mdmon(char *devnm) | |
1714 | { | |
1715 | int i, skipped; | |
1716 | int len; | |
1717 | pid_t pid; | |
1718 | int status; | |
1719 | char pathbuf[1024]; | |
1720 | char *paths[4] = { | |
1721 | pathbuf, | |
1722 | BINDIR "/mdmon", | |
1723 | "./mdmon", | |
1724 | NULL | |
1725 | }; | |
1726 | ||
1727 | if (check_env("MDADM_NO_MDMON")) | |
1728 | return 0; | |
1729 | ||
1730 | len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf)-1); | |
1731 | if (len > 0) { | |
1732 | char *sl; | |
1733 | pathbuf[len] = 0; | |
1734 | sl = strrchr(pathbuf, '/'); | |
1735 | if (sl) | |
1736 | sl++; | |
1737 | else | |
1738 | sl = pathbuf; | |
1739 | strcpy(sl, "mdmon"); | |
1740 | } else | |
1741 | pathbuf[0] = '\0'; | |
1742 | ||
1743 | /* First try to run systemctl */ | |
1744 | if (!check_env("MDADM_NO_SYSTEMCTL")) | |
1745 | switch(fork()) { | |
1746 | case 0: | |
1747 | /* FIXME yuk. CLOSE_EXEC?? */ | |
1748 | skipped = 0; | |
1749 | for (i = 3; skipped < 20; i++) | |
1750 | if (close(i) < 0) | |
1751 | skipped++; | |
1752 | else | |
1753 | skipped = 0; | |
1754 | ||
1755 | /* Don't want to see error messages from | |
1756 | * systemctl. If the service doesn't exist, | |
1757 | * we start mdmon ourselves. | |
1758 | */ | |
1759 | close(2); | |
1760 | open("/dev/null", O_WRONLY); | |
1761 | snprintf(pathbuf, sizeof(pathbuf), "mdmon@%s.service", | |
1762 | devnm); | |
1763 | status = execl("/usr/bin/systemctl", "systemctl", | |
1764 | "start", | |
1765 | pathbuf, NULL); | |
1766 | status = execl("/bin/systemctl", "systemctl", "start", | |
1767 | pathbuf, NULL); | |
1768 | exit(1); | |
1769 | case -1: pr_err("cannot run mdmon. Array remains readonly\n"); | |
1770 | return -1; | |
1771 | default: /* parent - good */ | |
1772 | pid = wait(&status); | |
1773 | if (pid >= 0 && status == 0) | |
1774 | return 0; | |
1775 | } | |
1776 | ||
1777 | /* That failed, try running mdmon directly */ | |
1778 | switch(fork()) { | |
1779 | case 0: | |
1780 | /* FIXME yuk. CLOSE_EXEC?? */ | |
1781 | skipped = 0; | |
1782 | for (i = 3; skipped < 20; i++) | |
1783 | if (close(i) < 0) | |
1784 | skipped++; | |
1785 | else | |
1786 | skipped = 0; | |
1787 | ||
1788 | for (i = 0; paths[i]; i++) | |
1789 | if (paths[i][0]) { | |
1790 | execl(paths[i], paths[i], | |
1791 | devnm, NULL); | |
1792 | } | |
1793 | exit(1); | |
1794 | case -1: pr_err("cannot run mdmon. Array remains readonly\n"); | |
1795 | return -1; | |
1796 | default: /* parent - good */ | |
1797 | pid = wait(&status); | |
1798 | if (pid < 0 || status != 0) { | |
1799 | pr_err("failed to launch mdmon. Array remains readonly\n"); | |
1800 | return -1; | |
1801 | } | |
1802 | } | |
1803 | return 0; | |
1804 | } | |
1805 | ||
1806 | __u32 random32(void) | |
1807 | { | |
1808 | __u32 rv; | |
1809 | int rfd = open("/dev/urandom", O_RDONLY); | |
1810 | if (rfd < 0 || read(rfd, &rv, 4) != 4) | |
1811 | rv = random(); | |
1812 | if (rfd >= 0) | |
1813 | close(rfd); | |
1814 | return rv; | |
1815 | } | |
1816 | ||
1817 | #ifndef MDASSEMBLE | |
1818 | int flush_metadata_updates(struct supertype *st) | |
1819 | { | |
1820 | int sfd; | |
1821 | if (!st->updates) { | |
1822 | st->update_tail = NULL; | |
1823 | return -1; | |
1824 | } | |
1825 | ||
1826 | sfd = connect_monitor(st->container_devnm); | |
1827 | if (sfd < 0) | |
1828 | return -1; | |
1829 | ||
1830 | while (st->updates) { | |
1831 | struct metadata_update *mu = st->updates; | |
1832 | st->updates = mu->next; | |
1833 | ||
1834 | send_message(sfd, mu, 0); | |
1835 | wait_reply(sfd, 0); | |
1836 | free(mu->buf); | |
1837 | free(mu); | |
1838 | } | |
1839 | ack(sfd, 0); | |
1840 | wait_reply(sfd, 0); | |
1841 | close(sfd); | |
1842 | st->update_tail = NULL; | |
1843 | return 0; | |
1844 | } | |
1845 | ||
1846 | void append_metadata_update(struct supertype *st, void *buf, int len) | |
1847 | { | |
1848 | ||
1849 | struct metadata_update *mu = xmalloc(sizeof(*mu)); | |
1850 | ||
1851 | mu->buf = buf; | |
1852 | mu->len = len; | |
1853 | mu->space = NULL; | |
1854 | mu->space_list = NULL; | |
1855 | mu->next = NULL; | |
1856 | *st->update_tail = mu; | |
1857 | st->update_tail = &mu->next; | |
1858 | } | |
1859 | #endif /* MDASSEMBLE */ | |
1860 | ||
1861 | #ifdef __TINYC__ | |
1862 | /* tinyc doesn't optimize this check in ioctl.h out ... */ | |
1863 | unsigned int __invalid_size_argument_for_IOC = 0; | |
1864 | #endif | |
1865 | ||
1866 | int experimental(void) | |
1867 | { | |
1868 | if (check_env("MDADM_EXPERIMENTAL")) | |
1869 | return 1; | |
1870 | else { | |
1871 | pr_err("To use this feature MDADM_EXPERIMENTAL environment variable has to be defined.\n"); | |
1872 | return 0; | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | /* Pick all spares matching given criteria from a container | |
1877 | * if min_size == 0 do not check size | |
1878 | * if domlist == NULL do not check domains | |
1879 | * if spare_group given add it to domains of each spare | |
1880 | * metadata allows to test domains using metadata of destination array */ | |
1881 | struct mdinfo *container_choose_spares(struct supertype *st, | |
1882 | unsigned long long min_size, | |
1883 | struct domainlist *domlist, | |
1884 | char *spare_group, | |
1885 | const char *metadata, int get_one) | |
1886 | { | |
1887 | struct mdinfo *d, **dp, *disks = NULL; | |
1888 | ||
1889 | /* get list of all disks in container */ | |
1890 | if (st->ss->getinfo_super_disks) | |
1891 | disks = st->ss->getinfo_super_disks(st); | |
1892 | ||
1893 | if (!disks) | |
1894 | return disks; | |
1895 | /* find spare devices on the list */ | |
1896 | dp = &disks->devs; | |
1897 | disks->array.spare_disks = 0; | |
1898 | while (*dp) { | |
1899 | int found = 0; | |
1900 | d = *dp; | |
1901 | if (d->disk.state == 0) { | |
1902 | /* check if size is acceptable */ | |
1903 | unsigned long long dev_size; | |
1904 | dev_t dev = makedev(d->disk.major,d->disk.minor); | |
1905 | ||
1906 | if (!min_size || | |
1907 | (dev_size_from_id(dev, &dev_size) && | |
1908 | dev_size >= min_size)) | |
1909 | found = 1; | |
1910 | /* check if domain matches */ | |
1911 | if (found && domlist) { | |
1912 | struct dev_policy *pol = devid_policy(dev); | |
1913 | if (spare_group) | |
1914 | pol_add(&pol, pol_domain, | |
1915 | spare_group, NULL); | |
1916 | if (domain_test(domlist, pol, metadata) != 1) | |
1917 | found = 0; | |
1918 | dev_policy_free(pol); | |
1919 | } | |
1920 | } | |
1921 | if (found) { | |
1922 | dp = &d->next; | |
1923 | disks->array.spare_disks++; | |
1924 | if (get_one) { | |
1925 | sysfs_free(*dp); | |
1926 | d->next = NULL; | |
1927 | } | |
1928 | } else { | |
1929 | *dp = d->next; | |
1930 | d->next = NULL; | |
1931 | sysfs_free(d); | |
1932 | } | |
1933 | } | |
1934 | return disks; | |
1935 | } | |
1936 | ||
1937 | /* Checks if paths point to the same device | |
1938 | * Returns 0 if they do. | |
1939 | * Returns 1 if they don't. | |
1940 | * Returns -1 if something went wrong, | |
1941 | * e.g. paths are empty or the files | |
1942 | * they point to don't exist */ | |
1943 | int compare_paths (char* path1, char* path2) | |
1944 | { | |
1945 | struct stat st1,st2; | |
1946 | ||
1947 | if (path1 == NULL || path2 == NULL) | |
1948 | return -1; | |
1949 | if (stat(path1,&st1) != 0) | |
1950 | return -1; | |
1951 | if (stat(path2,&st2) != 0) | |
1952 | return -1; | |
1953 | if ((st1.st_ino == st2.st_ino) && (st1.st_dev == st2.st_dev)) | |
1954 | return 0; | |
1955 | return 1; | |
1956 | } | |
1957 | ||
1958 | /* Make sure we can open as many devices as needed */ | |
1959 | void enable_fds(int devices) | |
1960 | { | |
1961 | unsigned int fds = 20 + devices; | |
1962 | struct rlimit lim; | |
1963 | if (getrlimit(RLIMIT_NOFILE, &lim) != 0 | |
1964 | || lim.rlim_cur >= fds) | |
1965 | return; | |
1966 | if (lim.rlim_max < fds) | |
1967 | lim.rlim_max = fds; | |
1968 | lim.rlim_cur = fds; | |
1969 | setrlimit(RLIMIT_NOFILE, &lim); | |
1970 | } | |
1971 | ||
1972 | int in_initrd(void) | |
1973 | { | |
1974 | /* This is based on similar function in systemd. */ | |
1975 | struct statfs s; | |
1976 | /* statfs.f_type is signed long on s390x and MIPS, causing all | |
1977 | sorts of sign extension problems with RAMFS_MAGIC being | |
1978 | defined as 0x858458f6 */ | |
1979 | return statfs("/", &s) >= 0 && | |
1980 | ((unsigned long)s.f_type == TMPFS_MAGIC || | |
1981 | ((unsigned long)s.f_type & 0xFFFFFFFFUL) == | |
1982 | ((unsigned long)RAMFS_MAGIC & 0xFFFFFFFFUL)); | |
1983 | } | |
1984 | ||
1985 | void reopen_mddev(int mdfd) | |
1986 | { | |
1987 | /* Re-open without any O_EXCL, but keep | |
1988 | * the same fd | |
1989 | */ | |
1990 | char *devnm; | |
1991 | int fd; | |
1992 | devnm = fd2devnm(mdfd); | |
1993 | close(mdfd); | |
1994 | fd = open_dev(devnm); | |
1995 | if (fd >= 0 && fd != mdfd) | |
1996 | dup2(fd, mdfd); | |
1997 | } | |
1998 | ||
1999 | int get_cluster_name(char **cluster_name) | |
2000 | { | |
2001 | void *lib_handle = NULL; | |
2002 | int rv = -1; | |
2003 | ||
2004 | cmap_handle_t handle; | |
2005 | static int (*initialize)(cmap_handle_t *handle); | |
2006 | static int (*get_string)(cmap_handle_t handle, | |
2007 | const char *string, | |
2008 | char **name); | |
2009 | static int (*finalize)(cmap_handle_t handle); | |
2010 | ||
2011 | ||
2012 | lib_handle = dlopen("libcmap.so.4", RTLD_NOW | RTLD_LOCAL); | |
2013 | if (!lib_handle) | |
2014 | return rv; | |
2015 | ||
2016 | initialize = dlsym(lib_handle, "cmap_initialize"); | |
2017 | if (!initialize) | |
2018 | goto out; | |
2019 | ||
2020 | get_string = dlsym(lib_handle, "cmap_get_string"); | |
2021 | if (!get_string) | |
2022 | goto out; | |
2023 | ||
2024 | finalize = dlsym(lib_handle, "cmap_finalize"); | |
2025 | if (!finalize) | |
2026 | goto out; | |
2027 | ||
2028 | rv = initialize(&handle); | |
2029 | if (rv != CS_OK) | |
2030 | goto out; | |
2031 | ||
2032 | rv = get_string(handle, "totem.cluster_name", cluster_name); | |
2033 | if (rv != CS_OK) { | |
2034 | free(*cluster_name); | |
2035 | rv = -1; | |
2036 | goto name_err; | |
2037 | } | |
2038 | ||
2039 | rv = 0; | |
2040 | name_err: | |
2041 | finalize(handle); | |
2042 | out: | |
2043 | dlclose(lib_handle); | |
2044 | return rv; | |
2045 | } |