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1 | /* | |
2 | * sysfs - extract md related information from sysfs. Part of: | |
3 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
4 | * | |
5 | * Copyright (C) 2006-2009 Neil Brown <neilb@suse.de> | |
6 | * | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | * Author: Neil Brown | |
23 | * Email: <neilb@suse.de> | |
24 | */ | |
25 | ||
26 | #include "mdadm.h" | |
27 | #include <dirent.h> | |
28 | #include <ctype.h> | |
29 | ||
30 | int load_sys(char *path, char *buf, int len) | |
31 | { | |
32 | int fd = open(path, O_RDONLY); | |
33 | int n; | |
34 | if (fd < 0) | |
35 | return -1; | |
36 | n = read(fd, buf, len); | |
37 | close(fd); | |
38 | if (n <0 || n >= len) | |
39 | return -1; | |
40 | buf[n] = 0; | |
41 | if (n && buf[n-1] == '\n') | |
42 | buf[n-1] = 0; | |
43 | return 0; | |
44 | } | |
45 | ||
46 | void sysfs_free(struct mdinfo *sra) | |
47 | { | |
48 | while (sra) { | |
49 | struct mdinfo *sra2 = sra->next; | |
50 | while (sra->devs) { | |
51 | struct mdinfo *d = sra->devs; | |
52 | sra->devs = d->next; | |
53 | free(d); | |
54 | } | |
55 | free(sra); | |
56 | sra = sra2; | |
57 | } | |
58 | } | |
59 | ||
60 | int sysfs_open(char *devnm, char *devname, char *attr) | |
61 | { | |
62 | char fname[50]; | |
63 | int fd; | |
64 | ||
65 | sprintf(fname, "/sys/block/%s/md/", devnm); | |
66 | if (devname) { | |
67 | strcat(fname, devname); | |
68 | strcat(fname, "/"); | |
69 | } | |
70 | strcat(fname, attr); | |
71 | fd = open(fname, O_RDWR); | |
72 | if (fd < 0 && errno == EACCES) | |
73 | fd = open(fname, O_RDONLY); | |
74 | return fd; | |
75 | } | |
76 | ||
77 | void sysfs_init_dev(struct mdinfo *mdi, unsigned long devid) | |
78 | { | |
79 | snprintf(mdi->sys_name, | |
80 | sizeof(mdi->sys_name), "dev-%s", devid2kname(devid)); | |
81 | } | |
82 | ||
83 | void sysfs_init(struct mdinfo *mdi, int fd, char *devnm) | |
84 | { | |
85 | mdi->sys_name[0] = 0; | |
86 | if (fd >= 0) { | |
87 | mdu_version_t vers; | |
88 | if (ioctl(fd, RAID_VERSION, &vers) != 0) | |
89 | return; | |
90 | devnm = fd2devnm(fd); | |
91 | } | |
92 | if (devnm == NULL) | |
93 | return; | |
94 | strcpy(mdi->sys_name, devnm); | |
95 | } | |
96 | ||
97 | struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options) | |
98 | { | |
99 | char fname[PATH_MAX]; | |
100 | char buf[PATH_MAX]; | |
101 | char *base; | |
102 | char *dbase; | |
103 | struct mdinfo *sra; | |
104 | struct mdinfo *dev, **devp; | |
105 | DIR *dir = NULL; | |
106 | struct dirent *de; | |
107 | ||
108 | sra = xcalloc(1, sizeof(*sra)); | |
109 | sysfs_init(sra, fd, devnm); | |
110 | if (sra->sys_name[0] == 0) { | |
111 | free(sra); | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | sprintf(fname, "/sys/block/%s/md/", sra->sys_name); | |
116 | base = fname + strlen(fname); | |
117 | ||
118 | sra->devs = NULL; | |
119 | if (options & GET_VERSION) { | |
120 | strcpy(base, "metadata_version"); | |
121 | if (load_sys(fname, buf, sizeof(buf))) | |
122 | goto abort; | |
123 | if (strncmp(buf, "none", 4) == 0) { | |
124 | sra->array.major_version = | |
125 | sra->array.minor_version = -1; | |
126 | strcpy(sra->text_version, ""); | |
127 | } else if (strncmp(buf, "external:", 9) == 0) { | |
128 | sra->array.major_version = -1; | |
129 | sra->array.minor_version = -2; | |
130 | strcpy(sra->text_version, buf+9); | |
131 | } else { | |
132 | sscanf(buf, "%d.%d", | |
133 | &sra->array.major_version, | |
134 | &sra->array.minor_version); | |
135 | strcpy(sra->text_version, buf); | |
136 | } | |
137 | } | |
138 | if (options & GET_LEVEL) { | |
139 | strcpy(base, "level"); | |
140 | if (load_sys(fname, buf, sizeof(buf))) | |
141 | goto abort; | |
142 | sra->array.level = map_name(pers, buf); | |
143 | } | |
144 | if (options & GET_LAYOUT) { | |
145 | strcpy(base, "layout"); | |
146 | if (load_sys(fname, buf, sizeof(buf))) | |
147 | goto abort; | |
148 | sra->array.layout = strtoul(buf, NULL, 0); | |
149 | } | |
150 | if (options & GET_DISKS) { | |
151 | strcpy(base, "raid_disks"); | |
152 | if (load_sys(fname, buf, sizeof(buf))) | |
153 | goto abort; | |
154 | sra->array.raid_disks = strtoul(buf, NULL, 0); | |
155 | } | |
156 | if (options & GET_DEGRADED) { | |
157 | strcpy(base, "degraded"); | |
158 | if (load_sys(fname, buf, sizeof(buf))) | |
159 | goto abort; | |
160 | sra->array.failed_disks = strtoul(buf, NULL, 0); | |
161 | } | |
162 | if (options & GET_COMPONENT) { | |
163 | strcpy(base, "component_size"); | |
164 | if (load_sys(fname, buf, sizeof(buf))) | |
165 | goto abort; | |
166 | sra->component_size = strtoull(buf, NULL, 0); | |
167 | /* sysfs reports "K", but we want sectors */ | |
168 | sra->component_size *= 2; | |
169 | } | |
170 | if (options & GET_CHUNK) { | |
171 | strcpy(base, "chunk_size"); | |
172 | if (load_sys(fname, buf, sizeof(buf))) | |
173 | goto abort; | |
174 | sra->array.chunk_size = strtoul(buf, NULL, 0); | |
175 | } | |
176 | if (options & GET_CACHE) { | |
177 | strcpy(base, "stripe_cache_size"); | |
178 | if (load_sys(fname, buf, sizeof(buf))) | |
179 | /* Probably level doesn't support it */ | |
180 | sra->cache_size = 0; | |
181 | else | |
182 | sra->cache_size = strtoul(buf, NULL, 0); | |
183 | } | |
184 | if (options & GET_MISMATCH) { | |
185 | strcpy(base, "mismatch_cnt"); | |
186 | if (load_sys(fname, buf, sizeof(buf))) | |
187 | goto abort; | |
188 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
189 | } | |
190 | if (options & GET_SAFEMODE) { | |
191 | int scale = 1; | |
192 | int dot = 0; | |
193 | unsigned i; | |
194 | unsigned long msec; | |
195 | size_t len; | |
196 | ||
197 | strcpy(base, "safe_mode_delay"); | |
198 | if (load_sys(fname, buf, sizeof(buf))) | |
199 | goto abort; | |
200 | ||
201 | /* remove a period, and count digits after it */ | |
202 | len = strlen(buf); | |
203 | for (i = 0; i < len; i++) { | |
204 | if (dot) { | |
205 | if (isdigit(buf[i])) { | |
206 | buf[i-1] = buf[i]; | |
207 | scale *= 10; | |
208 | } | |
209 | buf[i] = 0; | |
210 | } else if (buf[i] == '.') { | |
211 | dot=1; | |
212 | buf[i] = 0; | |
213 | } | |
214 | } | |
215 | msec = strtoul(buf, NULL, 10); | |
216 | msec = (msec * 1000) / scale; | |
217 | sra->safe_mode_delay = msec; | |
218 | } | |
219 | if (options & GET_BITMAP_LOCATION) { | |
220 | strcpy(base, "bitmap/location"); | |
221 | if (load_sys(fname, buf, sizeof(buf))) | |
222 | goto abort; | |
223 | if (strncmp(buf, "file", 4) == 0) | |
224 | sra->bitmap_offset = 1; | |
225 | else if (strncmp(buf, "none", 4) == 0) | |
226 | sra->bitmap_offset = 0; | |
227 | else if (buf[0] == '+') | |
228 | sra->bitmap_offset = strtol(buf+1, NULL, 10); | |
229 | else | |
230 | goto abort; | |
231 | } | |
232 | ||
233 | if (options & GET_ARRAY_STATE) { | |
234 | strcpy(base, "array_state"); | |
235 | if (load_sys(fname, sra->sysfs_array_state, | |
236 | sizeof(sra->sysfs_array_state))) | |
237 | goto abort; | |
238 | } else | |
239 | sra->sysfs_array_state[0] = 0; | |
240 | ||
241 | if (! (options & GET_DEVS)) | |
242 | return sra; | |
243 | ||
244 | /* Get all the devices as well */ | |
245 | *base = 0; | |
246 | dir = opendir(fname); | |
247 | if (!dir) | |
248 | goto abort; | |
249 | sra->array.spare_disks = 0; | |
250 | ||
251 | devp = &sra->devs; | |
252 | sra->devs = NULL; | |
253 | while ((de = readdir(dir)) != NULL) { | |
254 | char *ep; | |
255 | if (de->d_ino == 0 || | |
256 | strncmp(de->d_name, "dev-", 4) != 0) | |
257 | continue; | |
258 | strcpy(base, de->d_name); | |
259 | dbase = base + strlen(base); | |
260 | *dbase++ = '/'; | |
261 | ||
262 | dev = xmalloc(sizeof(*dev)); | |
263 | ||
264 | /* Always get slot, major, minor */ | |
265 | strcpy(dbase, "slot"); | |
266 | if (load_sys(fname, buf, sizeof(buf))) { | |
267 | /* hmm... unable to read 'slot' maybe the device | |
268 | * is going away? | |
269 | */ | |
270 | strcpy(dbase, "block"); | |
271 | if (readlink(fname, buf, sizeof(buf)) < 0 && | |
272 | errno != ENAMETOOLONG) { | |
273 | /* ...yup device is gone */ | |
274 | free(dev); | |
275 | continue; | |
276 | } else { | |
277 | /* slot is unreadable but 'block' link | |
278 | * still intact... something bad is happening | |
279 | * so abort | |
280 | */ | |
281 | free(dev); | |
282 | goto abort; | |
283 | } | |
284 | ||
285 | } | |
286 | strcpy(dev->sys_name, de->d_name); | |
287 | dev->disk.raid_disk = strtoul(buf, &ep, 10); | |
288 | if (*ep) dev->disk.raid_disk = -1; | |
289 | ||
290 | strcpy(dbase, "block/dev"); | |
291 | if (load_sys(fname, buf, sizeof(buf))) { | |
292 | /* assume this is a stale reference to a hot | |
293 | * removed device | |
294 | */ | |
295 | free(dev); | |
296 | continue; | |
297 | } | |
298 | sra->array.nr_disks++; | |
299 | sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor); | |
300 | ||
301 | /* special case check for block devices that can go 'offline' */ | |
302 | strcpy(dbase, "block/device/state"); | |
303 | if (load_sys(fname, buf, sizeof(buf)) == 0 && | |
304 | strncmp(buf, "offline", 7) == 0) { | |
305 | free(dev); | |
306 | continue; | |
307 | } | |
308 | ||
309 | /* finally add this disk to the array */ | |
310 | *devp = dev; | |
311 | devp = & dev->next; | |
312 | dev->next = NULL; | |
313 | ||
314 | if (options & GET_OFFSET) { | |
315 | strcpy(dbase, "offset"); | |
316 | if (load_sys(fname, buf, sizeof(buf))) | |
317 | goto abort; | |
318 | dev->data_offset = strtoull(buf, NULL, 0); | |
319 | strcpy(dbase, "new_offset"); | |
320 | if (load_sys(fname, buf, sizeof(buf)) == 0) | |
321 | dev->new_data_offset = strtoull(buf, NULL, 0); | |
322 | else | |
323 | dev->new_data_offset = dev->data_offset; | |
324 | } | |
325 | if (options & GET_SIZE) { | |
326 | strcpy(dbase, "size"); | |
327 | if (load_sys(fname, buf, sizeof(buf))) | |
328 | goto abort; | |
329 | dev->component_size = strtoull(buf, NULL, 0) * 2; | |
330 | } | |
331 | if (options & GET_STATE) { | |
332 | dev->disk.state = 0; | |
333 | strcpy(dbase, "state"); | |
334 | if (load_sys(fname, buf, sizeof(buf))) | |
335 | goto abort; | |
336 | if (strstr(buf, "in_sync")) | |
337 | dev->disk.state |= (1<<MD_DISK_SYNC); | |
338 | if (strstr(buf, "faulty")) | |
339 | dev->disk.state |= (1<<MD_DISK_FAULTY); | |
340 | if (dev->disk.state == 0) | |
341 | sra->array.spare_disks++; | |
342 | } | |
343 | if (options & GET_ERROR) { | |
344 | strcpy(buf, "errors"); | |
345 | if (load_sys(fname, buf, sizeof(buf))) | |
346 | goto abort; | |
347 | dev->errors = strtoul(buf, NULL, 0); | |
348 | } | |
349 | } | |
350 | closedir(dir); | |
351 | return sra; | |
352 | ||
353 | abort: | |
354 | if (dir) | |
355 | closedir(dir); | |
356 | sysfs_free(sra); | |
357 | return NULL; | |
358 | } | |
359 | ||
360 | int sysfs_attr_match(const char *attr, const char *str) | |
361 | { | |
362 | /* See if attr, read from a sysfs file, matches | |
363 | * str. They must either be the same, or attr can | |
364 | * have a trailing newline or comma | |
365 | */ | |
366 | while (*attr && *str && *attr == *str) { | |
367 | attr++; | |
368 | str++; | |
369 | } | |
370 | ||
371 | if (*str || (*attr && *attr != ',' && *attr != '\n')) | |
372 | return 0; | |
373 | return 1; | |
374 | } | |
375 | ||
376 | int sysfs_match_word(const char *word, char **list) | |
377 | { | |
378 | int n; | |
379 | for (n=0; list[n]; n++) | |
380 | if (sysfs_attr_match(word, list[n])) | |
381 | break; | |
382 | return n; | |
383 | } | |
384 | ||
385 | unsigned long long get_component_size(int fd) | |
386 | { | |
387 | /* Find out the component size of the array. | |
388 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
389 | * size field is only 32bits. | |
390 | * So look in /sys/block/mdXXX/md/component_size | |
391 | * | |
392 | * This returns in units of sectors. | |
393 | */ | |
394 | struct stat stb; | |
395 | char fname[50]; | |
396 | int n; | |
397 | if (fstat(fd, &stb)) return 0; | |
398 | if (major(stb.st_rdev) != (unsigned)get_mdp_major()) | |
399 | sprintf(fname, "/sys/block/md%d/md/component_size", | |
400 | (int)minor(stb.st_rdev)); | |
401 | else | |
402 | sprintf(fname, "/sys/block/md_d%d/md/component_size", | |
403 | (int)minor(stb.st_rdev)>>MdpMinorShift); | |
404 | fd = open(fname, O_RDONLY); | |
405 | if (fd < 0) | |
406 | return 0; | |
407 | n = read(fd, fname, sizeof(fname)); | |
408 | close(fd); | |
409 | if (n < 0 || n == sizeof(fname)) | |
410 | return 0; | |
411 | fname[n] = 0; | |
412 | return strtoull(fname, NULL, 10) * 2; | |
413 | } | |
414 | ||
415 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, | |
416 | char *name, char *val) | |
417 | { | |
418 | char fname[50]; | |
419 | unsigned int n; | |
420 | int fd; | |
421 | ||
422 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
423 | sra->sys_name, dev?dev->sys_name:"", name); | |
424 | fd = open(fname, O_WRONLY); | |
425 | if (fd < 0) | |
426 | return -1; | |
427 | n = write(fd, val, strlen(val)); | |
428 | close(fd); | |
429 | if (n != strlen(val)) { | |
430 | dprintf("failed to write '%s' to '%s' (%s)\n", | |
431 | val, fname, strerror(errno)); | |
432 | return -1; | |
433 | } | |
434 | return 0; | |
435 | } | |
436 | ||
437 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, | |
438 | char *name, unsigned long long val) | |
439 | { | |
440 | char valstr[50]; | |
441 | sprintf(valstr, "%llu", val); | |
442 | return sysfs_set_str(sra, dev, name, valstr); | |
443 | } | |
444 | ||
445 | int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev, | |
446 | char *name, long long val) | |
447 | { | |
448 | char valstr[50]; | |
449 | sprintf(valstr, "%lli", val); | |
450 | return sysfs_set_str(sra, dev, name, valstr); | |
451 | } | |
452 | ||
453 | int sysfs_uevent(struct mdinfo *sra, char *event) | |
454 | { | |
455 | char fname[50]; | |
456 | int n; | |
457 | int fd; | |
458 | ||
459 | sprintf(fname, "/sys/block/%s/uevent", | |
460 | sra->sys_name); | |
461 | fd = open(fname, O_WRONLY); | |
462 | if (fd < 0) | |
463 | return -1; | |
464 | n = write(fd, event, strlen(event)); | |
465 | close(fd); | |
466 | if (n != (int)strlen(event)) { | |
467 | dprintf("failed to write '%s' to '%s' (%s)\n", | |
468 | event, fname, strerror(errno)); | |
469 | return -1; | |
470 | } | |
471 | return 0; | |
472 | } | |
473 | ||
474 | int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name) | |
475 | { | |
476 | char fname[50]; | |
477 | struct stat st; | |
478 | ||
479 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
480 | sra->sys_name, dev?dev->sys_name:"", name); | |
481 | ||
482 | return stat(fname, &st) == 0; | |
483 | } | |
484 | ||
485 | int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, | |
486 | char *name) | |
487 | { | |
488 | char fname[50]; | |
489 | int fd; | |
490 | ||
491 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
492 | sra->sys_name, dev?dev->sys_name:"", name); | |
493 | fd = open(fname, O_RDWR); | |
494 | if (fd < 0) | |
495 | fd = open(fname, O_RDONLY); | |
496 | return fd; | |
497 | } | |
498 | ||
499 | int sysfs_fd_get_ll(int fd, unsigned long long *val) | |
500 | { | |
501 | char buf[50]; | |
502 | int n; | |
503 | char *ep; | |
504 | ||
505 | lseek(fd, 0, 0); | |
506 | n = read(fd, buf, sizeof(buf)); | |
507 | if (n <= 0 || n == sizeof(buf)) | |
508 | return -2; | |
509 | buf[n] = 0; | |
510 | *val = strtoull(buf, &ep, 0); | |
511 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
512 | return -1; | |
513 | return 0; | |
514 | } | |
515 | ||
516 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, | |
517 | char *name, unsigned long long *val) | |
518 | { | |
519 | int n; | |
520 | int fd; | |
521 | ||
522 | fd = sysfs_get_fd(sra, dev, name); | |
523 | if (fd < 0) | |
524 | return -1; | |
525 | n = sysfs_fd_get_ll(fd, val); | |
526 | close(fd); | |
527 | return n; | |
528 | } | |
529 | ||
530 | int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2) | |
531 | { | |
532 | /* two numbers in this sysfs file, either | |
533 | * NNN (NNN) | |
534 | * or | |
535 | * NNN / NNN | |
536 | */ | |
537 | char buf[80]; | |
538 | int n; | |
539 | char *ep, *ep2; | |
540 | ||
541 | lseek(fd, 0, 0); | |
542 | n = read(fd, buf, sizeof(buf)); | |
543 | if (n <= 0 || n == sizeof(buf)) | |
544 | return -2; | |
545 | buf[n] = 0; | |
546 | *v1 = strtoull(buf, &ep, 0); | |
547 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
548 | return -1; | |
549 | while (*ep == ' ' || *ep == '/' || *ep == '(') | |
550 | ep++; | |
551 | *v2 = strtoull(ep, &ep2, 0); | |
552 | if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) { | |
553 | *v2 = *v1; | |
554 | return 1; | |
555 | } | |
556 | return 2; | |
557 | } | |
558 | ||
559 | int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev, | |
560 | char *name, unsigned long long *v1, unsigned long long *v2) | |
561 | { | |
562 | int n; | |
563 | int fd; | |
564 | ||
565 | fd = sysfs_get_fd(sra, dev, name); | |
566 | if (fd < 0) | |
567 | return -1; | |
568 | n = sysfs_fd_get_two(fd, v1, v2); | |
569 | close(fd); | |
570 | return n; | |
571 | } | |
572 | ||
573 | int sysfs_fd_get_str(int fd, char *val, int size) | |
574 | { | |
575 | int n; | |
576 | ||
577 | lseek(fd, 0, 0); | |
578 | n = read(fd, val, size); | |
579 | if (n <= 0 || n == size) | |
580 | return -1; | |
581 | val[n] = 0; | |
582 | return n; | |
583 | } | |
584 | ||
585 | int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev, | |
586 | char *name, char *val, int size) | |
587 | { | |
588 | int n; | |
589 | int fd; | |
590 | ||
591 | fd = sysfs_get_fd(sra, dev, name); | |
592 | if (fd < 0) | |
593 | return -1; | |
594 | n = sysfs_fd_get_str(fd, val, size); | |
595 | close(fd); | |
596 | return n; | |
597 | } | |
598 | ||
599 | int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms) | |
600 | { | |
601 | unsigned long sec; | |
602 | unsigned long msec; | |
603 | char delay[30]; | |
604 | ||
605 | sec = ms / 1000; | |
606 | msec = ms % 1000; | |
607 | ||
608 | sprintf(delay, "%ld.%03ld\n", sec, msec); | |
609 | /* this '\n' ^ needed for kernels older than 2.6.28 */ | |
610 | return sysfs_set_str(sra, NULL, "safe_mode_delay", delay); | |
611 | } | |
612 | ||
613 | int sysfs_set_array(struct mdinfo *info, int vers) | |
614 | { | |
615 | int rv = 0; | |
616 | char ver[100]; | |
617 | int raid_disks = info->array.raid_disks; | |
618 | ||
619 | ver[0] = 0; | |
620 | if (info->array.major_version == -1 && | |
621 | info->array.minor_version == -2) { | |
622 | char buf[1024]; | |
623 | ||
624 | strcat(strcpy(ver, "external:"), info->text_version); | |
625 | ||
626 | /* meta version might already be set if we are setting | |
627 | * new geometry for a reshape. In that case we don't | |
628 | * want to over-write the 'readonly' flag that is | |
629 | * stored in the metadata version. So read the current | |
630 | * version first, and preserve the flag | |
631 | */ | |
632 | if (sysfs_get_str(info, NULL, "metadata_version", | |
633 | buf, 1024) > 0) | |
634 | if (strlen(buf) >= 9 && buf[9] == '-') | |
635 | ver[9] = '-'; | |
636 | ||
637 | if ((vers % 100) < 2 || | |
638 | sysfs_set_str(info, NULL, "metadata_version", | |
639 | ver) < 0) { | |
640 | pr_err("This kernel does not support external metadata.\n"); | |
641 | return 1; | |
642 | } | |
643 | } | |
644 | if (info->array.level < 0) | |
645 | return 0; /* FIXME */ | |
646 | rv |= sysfs_set_str(info, NULL, "level", | |
647 | map_num(pers, info->array.level)); | |
648 | if (info->reshape_active && info->delta_disks != UnSet) | |
649 | raid_disks -= info->delta_disks; | |
650 | rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks); | |
651 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size); | |
652 | rv |= sysfs_set_num(info, NULL, "layout", info->array.layout); | |
653 | rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2); | |
654 | if (info->custom_array_size) { | |
655 | int rc; | |
656 | ||
657 | rc = sysfs_set_num(info, NULL, "array_size", | |
658 | info->custom_array_size/2); | |
659 | if (rc && errno == ENOENT) { | |
660 | pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n"); | |
661 | rc = 0; | |
662 | } | |
663 | rv |= rc; | |
664 | } | |
665 | ||
666 | if (info->array.level > 0) | |
667 | rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start); | |
668 | ||
669 | if (info->reshape_active) { | |
670 | rv |= sysfs_set_num(info, NULL, "reshape_position", | |
671 | info->reshape_progress); | |
672 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk); | |
673 | rv |= sysfs_set_num(info, NULL, "layout", info->new_layout); | |
674 | rv |= sysfs_set_num(info, NULL, "raid_disks", | |
675 | info->array.raid_disks); | |
676 | /* We don't set 'new_level' here. That can only happen | |
677 | * once the reshape completes. | |
678 | */ | |
679 | } | |
680 | return rv; | |
681 | } | |
682 | ||
683 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume) | |
684 | { | |
685 | char dv[PATH_MAX]; | |
686 | char nm[PATH_MAX]; | |
687 | char *dname; | |
688 | int rv; | |
689 | ||
690 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
691 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
692 | if (rv) | |
693 | return rv; | |
694 | ||
695 | memset(nm, 0, sizeof(nm)); | |
696 | dname = devid2kname(makedev(sd->disk.major, sd->disk.minor)); | |
697 | strcpy(sd->sys_name, "dev-"); | |
698 | strcpy(sd->sys_name+4, dname); | |
699 | ||
700 | /* test write to see if 'recovery_start' is available */ | |
701 | if (resume && sd->recovery_start < MaxSector && | |
702 | sysfs_set_num(sra, sd, "recovery_start", 0)) { | |
703 | sysfs_set_str(sra, sd, "state", "remove"); | |
704 | return -1; | |
705 | } | |
706 | ||
707 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); | |
708 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); | |
709 | if (sra->array.level != LEVEL_CONTAINER) { | |
710 | if (sd->recovery_start == MaxSector) | |
711 | /* This can correctly fail if array isn't started, | |
712 | * yet, so just ignore status for now. | |
713 | */ | |
714 | sysfs_set_str(sra, sd, "state", "insync"); | |
715 | if (sd->disk.raid_disk >= 0) | |
716 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
717 | if (resume) | |
718 | sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start); | |
719 | } | |
720 | return rv; | |
721 | } | |
722 | ||
723 | #if 0 | |
724 | int sysfs_disk_to_sg(int fd) | |
725 | { | |
726 | /* from an open block device, try find and open its corresponding | |
727 | * scsi_generic interface | |
728 | */ | |
729 | struct stat st; | |
730 | char path[256]; | |
731 | char sg_path[256]; | |
732 | char sg_major_minor[10]; | |
733 | char *c; | |
734 | DIR *dir; | |
735 | struct dirent *de; | |
736 | int major, minor, rv; | |
737 | ||
738 | if (fstat(fd, &st)) | |
739 | return -1; | |
740 | ||
741 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
742 | major(st.st_rdev), minor(st.st_rdev)); | |
743 | ||
744 | dir = opendir(path); | |
745 | if (!dir) | |
746 | return -1; | |
747 | ||
748 | de = readdir(dir); | |
749 | while (de) { | |
750 | if (strncmp("scsi_generic:", de->d_name, | |
751 | strlen("scsi_generic:")) == 0) | |
752 | break; | |
753 | de = readdir(dir); | |
754 | } | |
755 | closedir(dir); | |
756 | ||
757 | if (!de) | |
758 | return -1; | |
759 | ||
760 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
761 | fd = open(sg_path, O_RDONLY); | |
762 | if (fd < 0) | |
763 | return fd; | |
764 | ||
765 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
766 | close(fd); | |
767 | if (rv < 0 || rv == sizeof(sg_major_minor)) | |
768 | return -1; | |
769 | else | |
770 | sg_major_minor[rv - 1] = '\0'; | |
771 | ||
772 | c = strchr(sg_major_minor, ':'); | |
773 | *c = '\0'; | |
774 | c++; | |
775 | major = strtol(sg_major_minor, NULL, 10); | |
776 | minor = strtol(c, NULL, 10); | |
777 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
778 | (int) getpid(), major, minor); | |
779 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
780 | fd = open(path, O_RDONLY); | |
781 | unlink(path); | |
782 | return fd; | |
783 | } | |
784 | ||
785 | return -1; | |
786 | } | |
787 | #endif | |
788 | ||
789 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) | |
790 | { | |
791 | /* from an open block device, try to retrieve it scsi_id */ | |
792 | struct stat st; | |
793 | char path[256]; | |
794 | DIR *dir; | |
795 | struct dirent *de; | |
796 | int host, bus, target, lun; | |
797 | ||
798 | if (fstat(fd, &st)) | |
799 | return 1; | |
800 | ||
801 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device", | |
802 | major(st.st_rdev), minor(st.st_rdev)); | |
803 | ||
804 | dir = opendir(path); | |
805 | if (!dir) | |
806 | return 1; | |
807 | ||
808 | for (de = readdir(dir); de; de = readdir(dir)) { | |
809 | int count; | |
810 | ||
811 | if (de->d_type != DT_DIR) | |
812 | continue; | |
813 | ||
814 | count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun); | |
815 | if (count == 4) | |
816 | break; | |
817 | } | |
818 | closedir(dir); | |
819 | ||
820 | if (!de) | |
821 | return 1; | |
822 | ||
823 | *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0); | |
824 | return 0; | |
825 | } | |
826 | ||
827 | int sysfs_unique_holder(char *devnm, long rdev) | |
828 | { | |
829 | /* Check that devnm is a holder of rdev, | |
830 | * and is the only holder. | |
831 | * we should be locked against races by | |
832 | * an O_EXCL on devnm | |
833 | * Return values: | |
834 | * 0 - not unique, not even a holder | |
835 | * 1 - unique, this is the only holder. | |
836 | * 2/3 - not unique, there is another holder | |
837 | * -1 - error, cannot find the holders | |
838 | */ | |
839 | DIR *dir; | |
840 | struct dirent *de; | |
841 | char dirname[100]; | |
842 | char l; | |
843 | int ret = 0; | |
844 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", | |
845 | major(rdev), minor(rdev)); | |
846 | dir = opendir(dirname); | |
847 | if (!dir) | |
848 | return -1; | |
849 | l = strlen(dirname); | |
850 | while ((de = readdir(dir)) != NULL) { | |
851 | char buf[100]; | |
852 | char *sl; | |
853 | int n; | |
854 | ||
855 | if (de->d_ino == 0) | |
856 | continue; | |
857 | if (de->d_name[0] == '.') | |
858 | continue; | |
859 | strcpy(dirname+l, "/"); | |
860 | strcat(dirname+l, de->d_name); | |
861 | n = readlink(dirname, buf, sizeof(buf)-1); | |
862 | if (n <= 0) | |
863 | continue; | |
864 | buf[n] = 0; | |
865 | sl = strrchr(buf, '/'); | |
866 | if (!sl) | |
867 | continue; | |
868 | sl++; | |
869 | ||
870 | if (strcmp(devnm, sl) == 0) | |
871 | ret |= 1; | |
872 | else | |
873 | ret |= 2; | |
874 | } | |
875 | closedir(dir); | |
876 | return ret; | |
877 | } | |
878 | ||
879 | int sysfs_freeze_array(struct mdinfo *sra) | |
880 | { | |
881 | /* Try to freeze resync/rebuild on this array/container. | |
882 | * Return -1 if the array is busy, | |
883 | * return 0 if this kernel doesn't support 'frozen' | |
884 | * return 1 if it worked. | |
885 | */ | |
886 | char buf[20]; | |
887 | ||
888 | if (!sysfs_attribute_available(sra, NULL, "sync_action")) | |
889 | return 1; /* no sync_action == frozen */ | |
890 | if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) | |
891 | return 0; | |
892 | if (strcmp(buf, "frozen\n") == 0) | |
893 | /* Already frozen */ | |
894 | return 0; | |
895 | if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0) | |
896 | return -1; | |
897 | if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0) | |
898 | return 0; | |
899 | return 1; | |
900 | } | |
901 | ||
902 | int sysfs_wait(int fd, int *msec) | |
903 | { | |
904 | /* Wait up to '*msec' for fd to have an exception condition. | |
905 | * if msec == NULL, wait indefinitely. | |
906 | */ | |
907 | fd_set fds; | |
908 | int n; | |
909 | FD_ZERO(&fds); | |
910 | FD_SET(fd, &fds); | |
911 | if (msec == NULL) | |
912 | n = select(fd+1, NULL, NULL, &fds, NULL); | |
913 | else if (*msec < 0) | |
914 | n = 0; | |
915 | else { | |
916 | struct timeval start, end, tv; | |
917 | gettimeofday(&start, NULL); | |
918 | if (*msec < 1000) { | |
919 | tv.tv_sec = 0; | |
920 | tv.tv_usec = (*msec)*1000; | |
921 | } else { | |
922 | tv.tv_sec = (*msec)/1000; | |
923 | tv.tv_usec = 0; | |
924 | } | |
925 | n = select(fd+1, NULL, NULL, &fds, &tv); | |
926 | gettimeofday(&end, NULL); | |
927 | end.tv_sec -= start.tv_sec; | |
928 | *msec -= (end.tv_sec * 1000 + end.tv_usec/1000 | |
929 | - start.tv_usec/1000) + 1; | |
930 | } | |
931 | return n; | |
932 | } |