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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 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 | ||
29 | int load_sys(char *path, char *buf) | |
30 | { | |
31 | int fd = open(path, O_RDONLY); | |
32 | int n; | |
33 | if (fd < 0) | |
34 | return -1; | |
35 | n = read(fd, buf, 1024); | |
36 | close(fd); | |
37 | if (n <0 || n >= 1024) | |
38 | return -1; | |
39 | buf[n] = 0; | |
40 | if (n && buf[n-1] == '\n') | |
41 | buf[n-1] = 0; | |
42 | return 0; | |
43 | } | |
44 | ||
45 | void sysfs_free(struct mdinfo *sra) | |
46 | { | |
47 | while (sra) { | |
48 | struct mdinfo *sra2 = sra->next; | |
49 | while (sra->devs) { | |
50 | struct mdinfo *d = sra->devs; | |
51 | sra->devs = d->next; | |
52 | free(d); | |
53 | } | |
54 | free(sra); | |
55 | sra = sra2; | |
56 | } | |
57 | } | |
58 | ||
59 | int sysfs_open(int devnum, char *devname, char *attr) | |
60 | { | |
61 | char fname[50]; | |
62 | int fd; | |
63 | ||
64 | sprintf(fname, "/sys/block/%s/md/", devnum2devname(devnum)); | |
65 | if (devname) { | |
66 | strcat(fname, devname); | |
67 | strcat(fname, "/"); | |
68 | } | |
69 | strcat(fname, attr); | |
70 | fd = open(fname, O_RDWR); | |
71 | if (fd < 0 && errno == EACCES) | |
72 | fd = open(fname, O_RDONLY); | |
73 | return fd; | |
74 | } | |
75 | ||
76 | struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options) | |
77 | { | |
78 | /* Longest possible name in sysfs, mounted at /sys, is | |
79 | * /sys/block/md_dXXX/md/dev-XXXXX/block/dev | |
80 | * /sys/block/md_dXXX/md/metadata_version | |
81 | * which is about 41 characters. 50 should do for now | |
82 | */ | |
83 | char fname[50]; | |
84 | char buf[1024]; | |
85 | char *base; | |
86 | char *dbase; | |
87 | struct mdinfo *sra; | |
88 | struct mdinfo *dev; | |
89 | DIR *dir = NULL; | |
90 | struct dirent *de; | |
91 | ||
92 | sra = malloc(sizeof(*sra)); | |
93 | if (sra == NULL) | |
94 | return sra; | |
95 | sra->next = NULL; | |
96 | ||
97 | if (fd >= 0) { | |
98 | struct stat stb; | |
99 | mdu_version_t vers; | |
100 | if (fstat(fd, &stb)) return NULL; | |
101 | if (ioctl(fd, RAID_VERSION, &vers) != 0) | |
102 | return NULL; | |
103 | if (major(stb.st_rdev)==9) | |
104 | sprintf(sra->sys_name, "md%d", (int)minor(stb.st_rdev)); | |
105 | else | |
106 | sprintf(sra->sys_name, "md_d%d", | |
107 | (int)minor(stb.st_rdev)>>MdpMinorShift); | |
108 | } else { | |
109 | if (devnum >= 0) | |
110 | sprintf(sra->sys_name, "md%d", devnum); | |
111 | else | |
112 | sprintf(sra->sys_name, "md_d%d", | |
113 | -1-devnum); | |
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)) | |
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)) | |
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)) | |
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)) | |
153 | goto abort; | |
154 | sra->array.raid_disks = strtoul(buf, NULL, 0); | |
155 | } | |
156 | if (options & GET_COMPONENT) { | |
157 | strcpy(base, "component_size"); | |
158 | if (load_sys(fname, buf)) | |
159 | goto abort; | |
160 | sra->component_size = strtoull(buf, NULL, 0); | |
161 | /* sysfs reports "K", but we want sectors */ | |
162 | sra->component_size *= 2; | |
163 | } | |
164 | if (options & GET_CHUNK) { | |
165 | strcpy(base, "chunk_size"); | |
166 | if (load_sys(fname, buf)) | |
167 | goto abort; | |
168 | sra->array.chunk_size = strtoul(buf, NULL, 0); | |
169 | } | |
170 | if (options & GET_CACHE) { | |
171 | strcpy(base, "stripe_cache_size"); | |
172 | if (load_sys(fname, buf)) | |
173 | goto abort; | |
174 | sra->cache_size = strtoul(buf, NULL, 0); | |
175 | } | |
176 | if (options & GET_MISMATCH) { | |
177 | strcpy(base, "mismatch_cnt"); | |
178 | if (load_sys(fname, buf)) | |
179 | goto abort; | |
180 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
181 | } | |
182 | ||
183 | if (! (options & GET_DEVS)) | |
184 | return sra; | |
185 | ||
186 | /* Get all the devices as well */ | |
187 | *base = 0; | |
188 | dir = opendir(fname); | |
189 | if (!dir) | |
190 | goto abort; | |
191 | sra->array.spare_disks = 0; | |
192 | ||
193 | while ((de = readdir(dir)) != NULL) { | |
194 | char *ep; | |
195 | if (de->d_ino == 0 || | |
196 | strncmp(de->d_name, "dev-", 4) != 0) | |
197 | continue; | |
198 | strcpy(base, de->d_name); | |
199 | dbase = base + strlen(base); | |
200 | *dbase++ = '/'; | |
201 | ||
202 | dev = malloc(sizeof(*dev)); | |
203 | if (!dev) | |
204 | goto abort; | |
205 | dev->next = sra->devs; | |
206 | sra->devs = dev; | |
207 | strcpy(dev->sys_name, de->d_name); | |
208 | ||
209 | /* Always get slot, major, minor */ | |
210 | strcpy(dbase, "slot"); | |
211 | if (load_sys(fname, buf)) | |
212 | goto abort; | |
213 | dev->disk.raid_disk = strtoul(buf, &ep, 10); | |
214 | if (*ep) dev->disk.raid_disk = -1; | |
215 | ||
216 | strcpy(dbase, "block/dev"); | |
217 | if (load_sys(fname, buf)) | |
218 | goto abort; | |
219 | sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor); | |
220 | ||
221 | if (options & GET_OFFSET) { | |
222 | strcpy(dbase, "offset"); | |
223 | if (load_sys(fname, buf)) | |
224 | goto abort; | |
225 | dev->data_offset = strtoull(buf, NULL, 0); | |
226 | } | |
227 | if (options & GET_SIZE) { | |
228 | strcpy(dbase, "size"); | |
229 | if (load_sys(fname, buf)) | |
230 | goto abort; | |
231 | dev->component_size = strtoull(buf, NULL, 0) * 2; | |
232 | } | |
233 | if (options & GET_STATE) { | |
234 | dev->disk.state = 0; | |
235 | strcpy(dbase, "state"); | |
236 | if (load_sys(fname, buf)) | |
237 | goto abort; | |
238 | if (strstr(buf, "in_sync")) | |
239 | dev->disk.state |= (1<<MD_DISK_SYNC); | |
240 | if (strstr(buf, "faulty")) | |
241 | dev->disk.state |= (1<<MD_DISK_FAULTY); | |
242 | if (dev->disk.state == 0) | |
243 | sra->array.spare_disks++; | |
244 | } | |
245 | if (options & GET_ERROR) { | |
246 | strcpy(buf, "errors"); | |
247 | if (load_sys(fname, buf)) | |
248 | goto abort; | |
249 | dev->errors = strtoul(buf, NULL, 0); | |
250 | } | |
251 | } | |
252 | closedir(dir); | |
253 | return sra; | |
254 | ||
255 | abort: | |
256 | if (dir) | |
257 | closedir(dir); | |
258 | sysfs_free(sra); | |
259 | return NULL; | |
260 | } | |
261 | ||
262 | unsigned long long get_component_size(int fd) | |
263 | { | |
264 | /* Find out the component size of the array. | |
265 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
266 | * size field is only 32bits. | |
267 | * So look in /sys/block/mdXXX/md/component_size | |
268 | * | |
269 | * This returns in units of sectors. | |
270 | */ | |
271 | struct stat stb; | |
272 | char fname[50]; | |
273 | int n; | |
274 | if (fstat(fd, &stb)) return 0; | |
275 | if (major(stb.st_rdev) == 9) | |
276 | sprintf(fname, "/sys/block/md%d/md/component_size", | |
277 | (int)minor(stb.st_rdev)); | |
278 | else | |
279 | sprintf(fname, "/sys/block/md_d%d/md/component_size", | |
280 | (int)minor(stb.st_rdev)>>MdpMinorShift); | |
281 | fd = open(fname, O_RDONLY); | |
282 | if (fd < 0) | |
283 | return 0; | |
284 | n = read(fd, fname, sizeof(fname)); | |
285 | close(fd); | |
286 | if (n == sizeof(fname)) | |
287 | return 0; | |
288 | fname[n] = 0; | |
289 | return strtoull(fname, NULL, 10) * 2; | |
290 | } | |
291 | ||
292 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, | |
293 | char *name, char *val) | |
294 | { | |
295 | char fname[50]; | |
296 | int n; | |
297 | int fd; | |
298 | ||
299 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
300 | sra->sys_name, dev?dev->sys_name:"", name); | |
301 | fd = open(fname, O_WRONLY); | |
302 | if (fd < 0) | |
303 | return -1; | |
304 | n = write(fd, val, strlen(val)); | |
305 | close(fd); | |
306 | if (n != strlen(val)) | |
307 | return -1; | |
308 | return 0; | |
309 | } | |
310 | ||
311 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, | |
312 | char *name, unsigned long long val) | |
313 | { | |
314 | char valstr[50]; | |
315 | sprintf(valstr, "%llu", val); | |
316 | return sysfs_set_str(sra, dev, name, valstr); | |
317 | } | |
318 | ||
319 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, | |
320 | char *name, unsigned long long *val) | |
321 | { | |
322 | char fname[50]; | |
323 | char buf[50]; | |
324 | int n; | |
325 | int fd; | |
326 | char *ep; | |
327 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
328 | sra->sys_name, dev?dev->sys_name:"", name); | |
329 | fd = open(fname, O_RDONLY); | |
330 | if (fd < 0) | |
331 | return -1; | |
332 | n = read(fd, buf, sizeof(buf)); | |
333 | close(fd); | |
334 | if (n <= 0) | |
335 | return -1; | |
336 | buf[n] = 0; | |
337 | *val = strtoull(buf, &ep, 0); | |
338 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
339 | return -1; | |
340 | return 0; | |
341 | } | |
342 | ||
343 | int sysfs_set_array(struct mdinfo *sra, | |
344 | struct mdinfo *info) | |
345 | { | |
346 | int rv = 0; | |
347 | sra->array = info->array; | |
348 | ||
349 | if (info->array.level < 0) | |
350 | return 0; /* FIXME */ | |
351 | rv |= sysfs_set_str(sra, NULL, "level", | |
352 | map_num(pers, info->array.level)); | |
353 | rv |= sysfs_set_num(sra, NULL, "raid_disks", info->array.raid_disks); | |
354 | rv |= sysfs_set_num(sra, NULL, "chunk_size", info->array.chunk_size); | |
355 | rv |= sysfs_set_num(sra, NULL, "layout", info->array.layout); | |
356 | rv |= sysfs_set_num(sra, NULL, "component_size", info->component_size/2); | |
357 | rv |= sysfs_set_num(sra, NULL, "resync_start", info->resync_start); | |
358 | sra->array = info->array; | |
359 | return rv; | |
360 | } | |
361 | ||
362 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd) | |
363 | { | |
364 | char dv[100]; | |
365 | char nm[100]; | |
366 | struct mdinfo *sd2; | |
367 | char *dname; | |
368 | int rv; | |
369 | ||
370 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
371 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
372 | if (rv) | |
373 | return rv; | |
374 | ||
375 | memset(nm, 0, sizeof(nm)); | |
376 | sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor); | |
377 | rv = readlink(dv, nm, sizeof(nm)); | |
378 | if (rv <= 0) | |
379 | return -1; | |
380 | nm[rv] = '\0'; | |
381 | dname = strrchr(nm, '/'); | |
382 | if (dname) dname++; | |
383 | strcpy(sd->sys_name, "dev-"); | |
384 | strcpy(sd->sys_name+4, dname); | |
385 | ||
386 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); | |
387 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); | |
388 | if (sra->array.level != LEVEL_CONTAINER) { | |
389 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
390 | // rv |= sysfs_set_str(sra, sd, "state", "in_sync"); | |
391 | } | |
392 | if (! rv) { | |
393 | sd2 = malloc(sizeof(*sd2)); | |
394 | *sd2 = *sd; | |
395 | sd2->next = sra->devs; | |
396 | sra->devs = sd2; | |
397 | } | |
398 | return rv; | |
399 | } | |
400 | ||
401 | int sysfs_disk_to_sg(int fd) | |
402 | { | |
403 | /* from an open block device, try find and open its corresponding | |
404 | * scsi_generic interface | |
405 | */ | |
406 | struct stat st; | |
407 | char path[256]; | |
408 | char sg_path[256]; | |
409 | char sg_major_minor[8]; | |
410 | char *c; | |
411 | DIR *dir; | |
412 | struct dirent *de; | |
413 | int major, minor, rv; | |
414 | ||
415 | if (fstat(fd, &st)) | |
416 | return -1; | |
417 | ||
418 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
419 | major(st.st_rdev), minor(st.st_rdev)); | |
420 | ||
421 | dir = opendir(path); | |
422 | if (!dir) | |
423 | return -1; | |
424 | ||
425 | de = readdir(dir); | |
426 | while (de) { | |
427 | if (strncmp("scsi_generic:", de->d_name, | |
428 | strlen("scsi_generic:")) == 0) | |
429 | break; | |
430 | de = readdir(dir); | |
431 | } | |
432 | closedir(dir); | |
433 | ||
434 | if (!de) | |
435 | return -1; | |
436 | ||
437 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
438 | fd = open(sg_path, O_RDONLY); | |
439 | if (fd < 0) | |
440 | return fd; | |
441 | ||
442 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
443 | close(fd); | |
444 | if (rv < 0) | |
445 | return -1; | |
446 | else | |
447 | sg_major_minor[rv - 1] = '\0'; | |
448 | ||
449 | c = strchr(sg_major_minor, ':'); | |
450 | *c = '\0'; | |
451 | c++; | |
452 | major = strtol(sg_major_minor, NULL, 10); | |
453 | minor = strtol(c, NULL, 10); | |
454 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
455 | (int) getpid(), major, minor); | |
456 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
457 | fd = open(path, O_RDONLY); | |
458 | unlink(path); | |
459 | return fd; | |
460 | } | |
461 | ||
462 | return -1; | |
463 | } | |
464 | ||
465 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) | |
466 | { | |
467 | /* from an open block device, try to retrieve it scsi_id */ | |
468 | struct stat st; | |
469 | char path[256]; | |
470 | char *c1, *c2; | |
471 | DIR *dir; | |
472 | struct dirent *de; | |
473 | ||
474 | if (fstat(fd, &st)) | |
475 | return 1; | |
476 | ||
477 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
478 | major(st.st_rdev), minor(st.st_rdev)); | |
479 | ||
480 | dir = opendir(path); | |
481 | if (!dir) | |
482 | return 1; | |
483 | ||
484 | de = readdir(dir); | |
485 | while (de) { | |
486 | if (strncmp("scsi_disk:", de->d_name, | |
487 | strlen("scsi_disk:")) == 0) | |
488 | break; | |
489 | de = readdir(dir); | |
490 | } | |
491 | closedir(dir); | |
492 | ||
493 | if (!de) | |
494 | return 1; | |
495 | ||
496 | c1 = strchr(de->d_name, ':'); | |
497 | c1++; | |
498 | c2 = strchr(c1, ':'); | |
499 | *c2 = '\0'; | |
500 | *id = strtol(c1, NULL, 10) << 24; /* host */ | |
501 | c1 = c2 + 1; | |
502 | c2 = strchr(c1, ':'); | |
503 | *c2 = '\0'; | |
504 | *id |= strtol(c1, NULL, 10) << 16; /* channel */ | |
505 | c1 = c2 + 1; | |
506 | c2 = strchr(c1, ':'); | |
507 | *c2 = '\0'; | |
508 | *id |= strtol(c1, NULL, 10) << 8; /* lun */ | |
509 | c1 = c2 + 1; | |
510 | *id |= strtol(c1, NULL, 10); /* id */ | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
515 | ||
516 | int sysfs_unique_holder(int devnum, long rdev) | |
517 | { | |
518 | /* Check that devnum is a holder of rdev, | |
519 | * and is the only holder. | |
520 | * we should be locked against races by | |
521 | * an O_EXCL on devnum | |
522 | */ | |
523 | DIR *dir; | |
524 | struct dirent *de; | |
525 | char dirname[100]; | |
526 | char l; | |
527 | int found = 0; | |
528 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", | |
529 | major(rdev), minor(rdev)); | |
530 | dir = opendir(dirname); | |
531 | errno = ENOENT; | |
532 | if (!dir) | |
533 | return 0; | |
534 | l = strlen(dirname); | |
535 | while ((de = readdir(dir)) != NULL) { | |
536 | char buf[10]; | |
537 | int n; | |
538 | int mj, mn; | |
539 | char c; | |
540 | int fd; | |
541 | ||
542 | if (de->d_ino == 0) | |
543 | continue; | |
544 | if (de->d_name[0] == '.') | |
545 | continue; | |
546 | strcpy(dirname+l, "/"); | |
547 | strcat(dirname+l, de->d_name); | |
548 | strcat(dirname+l, "/dev"); | |
549 | fd = open(dirname, O_RDONLY); | |
550 | if (fd < 0) { | |
551 | errno = ENOENT; | |
552 | break; | |
553 | } | |
554 | n = read(fd, buf, sizeof(buf)-1); | |
555 | close(fd); | |
556 | buf[n] = 0; | |
557 | if (sscanf(buf, "%d:%d%c", &mj, &mn, &c) != 3 || | |
558 | c != '\n') { | |
559 | errno = ENOENT; | |
560 | break; | |
561 | } | |
562 | if (mj != MD_MAJOR) | |
563 | mn = -1-(mn>>6); | |
564 | ||
565 | if (devnum != mn) { | |
566 | errno = EEXIST; | |
567 | break; | |
568 | } | |
569 | found = 1; | |
570 | } | |
571 | closedir(dir); | |
572 | if (de) | |
573 | return 0; | |
574 | else | |
575 | return found; | |
576 | } |