]>
Commit | Line | Data |
---|---|---|
e86c9dd6 NB |
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> | |
1770662b | 28 | #include <ctype.h> |
e86c9dd6 NB |
29 | |
30 | int load_sys(char *path, char *buf) | |
31 | { | |
32 | int fd = open(path, O_RDONLY); | |
33 | int n; | |
34 | if (fd < 0) | |
35 | return -1; | |
36 | n = read(fd, buf, 1024); | |
37 | close(fd); | |
2f6079dc | 38 | if (n <0 || n >= 1024) |
e86c9dd6 NB |
39 | return -1; |
40 | buf[n] = 0; | |
8dfb8619 | 41 | if (n && buf[n-1] == '\n') |
e86c9dd6 NB |
42 | buf[n-1] = 0; |
43 | return 0; | |
44 | } | |
45 | ||
7e0f6979 | 46 | void sysfs_free(struct mdinfo *sra) |
8382f19b | 47 | { |
7e0f6979 NB |
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; | |
8382f19b | 57 | } |
8382f19b NB |
58 | } |
59 | ||
549e9569 NB |
60 | int sysfs_open(int devnum, char *devname, char *attr) |
61 | { | |
62 | char fname[50]; | |
549e9569 | 63 | int fd; |
1e4bc070 | 64 | char *mdname = devnum2devname(devnum); |
549e9569 | 65 | |
1e4bc070 DW |
66 | if (!mdname) |
67 | return -1; | |
68 | ||
69 | sprintf(fname, "/sys/block/%s/md/", mdname); | |
549e9569 NB |
70 | if (devname) { |
71 | strcat(fname, devname); | |
72 | strcat(fname, "/"); | |
73 | } | |
74 | strcat(fname, attr); | |
75 | fd = open(fname, O_RDWR); | |
ea6d09b0 | 76 | if (fd < 0 && errno == EACCES) |
549e9569 | 77 | fd = open(fname, O_RDONLY); |
1e4bc070 | 78 | free(mdname); |
549e9569 NB |
79 | return fd; |
80 | } | |
81 | ||
f35f2525 N |
82 | void sysfs_init(struct mdinfo *mdi, int fd, int devnum) |
83 | { | |
678a4a36 | 84 | mdi->sys_name[0] = 0; |
f35f2525 | 85 | if (fd >= 0) { |
f35f2525 | 86 | mdu_version_t vers; |
f35f2525 N |
87 | if (ioctl(fd, RAID_VERSION, &vers) != 0) |
88 | return; | |
d7ab966b | 89 | devnum = fd2devnum(fd); |
f35f2525 | 90 | } |
d7ab966b N |
91 | if (devnum == NoMdDev) |
92 | return; | |
93 | if (devnum >= 0) | |
94 | sprintf(mdi->sys_name, "md%d", devnum); | |
95 | else | |
96 | sprintf(mdi->sys_name, "md_d%d", | |
97 | -1-devnum); | |
f35f2525 N |
98 | } |
99 | ||
d7ab966b | 100 | |
7e0f6979 | 101 | struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options) |
e86c9dd6 NB |
102 | { |
103 | /* Longest possible name in sysfs, mounted at /sys, is | |
104 | * /sys/block/md_dXXX/md/dev-XXXXX/block/dev | |
105 | * /sys/block/md_dXXX/md/metadata_version | |
106 | * which is about 41 characters. 50 should do for now | |
107 | */ | |
108 | char fname[50]; | |
109 | char buf[1024]; | |
110 | char *base; | |
111 | char *dbase; | |
7e0f6979 | 112 | struct mdinfo *sra; |
06c7f68e | 113 | struct mdinfo *dev; |
355726fa | 114 | DIR *dir = NULL; |
e86c9dd6 NB |
115 | struct dirent *de; |
116 | ||
117 | sra = malloc(sizeof(*sra)); | |
118 | if (sra == NULL) | |
119 | return sra; | |
f35f2525 N |
120 | memset(sra, 0, sizeof(*sra)); |
121 | sysfs_init(sra, fd, devnum); | |
678a4a36 N |
122 | if (sra->sys_name[0] == 0) { |
123 | free(sra); | |
124 | return NULL; | |
125 | } | |
e86c9dd6 | 126 | |
7e0f6979 | 127 | sprintf(fname, "/sys/block/%s/md/", sra->sys_name); |
e86c9dd6 NB |
128 | base = fname + strlen(fname); |
129 | ||
130 | sra->devs = NULL; | |
8382f19b NB |
131 | if (options & GET_VERSION) { |
132 | strcpy(base, "metadata_version"); | |
133 | if (load_sys(fname, buf)) | |
134 | goto abort; | |
294d6f45 | 135 | if (strncmp(buf, "none", 4) == 0) { |
7e0f6979 NB |
136 | sra->array.major_version = |
137 | sra->array.minor_version = -1; | |
294d6f45 NB |
138 | strcpy(sra->text_version, ""); |
139 | } else if (strncmp(buf, "external:", 9) == 0) { | |
142cb9e1 NB |
140 | sra->array.major_version = -1; |
141 | sra->array.minor_version = -2; | |
142 | strcpy(sra->text_version, buf+9); | |
b8ac1967 | 143 | } else { |
8382f19b | 144 | sscanf(buf, "%d.%d", |
7e0f6979 NB |
145 | &sra->array.major_version, |
146 | &sra->array.minor_version); | |
b8ac1967 NB |
147 | strcpy(sra->text_version, buf); |
148 | } | |
8382f19b | 149 | } |
e86c9dd6 NB |
150 | if (options & GET_LEVEL) { |
151 | strcpy(base, "level"); | |
152 | if (load_sys(fname, buf)) | |
153 | goto abort; | |
7e0f6979 | 154 | sra->array.level = map_name(pers, buf); |
e86c9dd6 NB |
155 | } |
156 | if (options & GET_LAYOUT) { | |
157 | strcpy(base, "layout"); | |
158 | if (load_sys(fname, buf)) | |
159 | goto abort; | |
7e0f6979 | 160 | sra->array.layout = strtoul(buf, NULL, 0); |
e86c9dd6 | 161 | } |
549e9569 NB |
162 | if (options & GET_DISKS) { |
163 | strcpy(base, "raid_disks"); | |
164 | if (load_sys(fname, buf)) | |
165 | goto abort; | |
166 | sra->array.raid_disks = strtoul(buf, NULL, 0); | |
f1d26766 DW |
167 | } |
168 | if (options & GET_DEGRADED) { | |
169 | strcpy(base, "degraded"); | |
170 | if (load_sys(fname, buf)) | |
171 | goto abort; | |
172 | sra->array.failed_disks = strtoul(buf, NULL, 0); | |
549e9569 | 173 | } |
e86c9dd6 NB |
174 | if (options & GET_COMPONENT) { |
175 | strcpy(base, "component_size"); | |
176 | if (load_sys(fname, buf)) | |
177 | goto abort; | |
178 | sra->component_size = strtoull(buf, NULL, 0); | |
353632d9 NB |
179 | /* sysfs reports "K", but we want sectors */ |
180 | sra->component_size *= 2; | |
e86c9dd6 NB |
181 | } |
182 | if (options & GET_CHUNK) { | |
183 | strcpy(base, "chunk_size"); | |
184 | if (load_sys(fname, buf)) | |
185 | goto abort; | |
7e0f6979 | 186 | sra->array.chunk_size = strtoul(buf, NULL, 0); |
e86c9dd6 | 187 | } |
758d3a8e NB |
188 | if (options & GET_CACHE) { |
189 | strcpy(base, "stripe_cache_size"); | |
190 | if (load_sys(fname, buf)) | |
191 | goto abort; | |
192 | sra->cache_size = strtoul(buf, NULL, 0); | |
193 | } | |
37dfc3d6 NB |
194 | if (options & GET_MISMATCH) { |
195 | strcpy(base, "mismatch_cnt"); | |
196 | if (load_sys(fname, buf)) | |
197 | goto abort; | |
198 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
199 | } | |
1770662b DW |
200 | if (options & GET_SAFEMODE) { |
201 | int scale = 1; | |
202 | int dot = 0; | |
203 | int i; | |
204 | unsigned long msec; | |
205 | size_t len; | |
206 | ||
207 | strcpy(base, "safe_mode_delay"); | |
208 | if (load_sys(fname, buf)) | |
209 | goto abort; | |
210 | ||
211 | /* remove a period, and count digits after it */ | |
212 | len = strlen(buf); | |
213 | for (i = 0; i < len; i++) { | |
214 | if (dot) { | |
215 | if (isdigit(buf[i])) { | |
216 | buf[i-1] = buf[i]; | |
217 | scale *= 10; | |
218 | } | |
219 | buf[i] = 0; | |
220 | } else if (buf[i] == '.') { | |
221 | dot=1; | |
222 | buf[i] = 0; | |
223 | } | |
224 | } | |
225 | msec = strtoul(buf, NULL, 10); | |
226 | msec = (msec * 1000) / scale; | |
227 | sra->safe_mode_delay = msec; | |
228 | } | |
e86c9dd6 NB |
229 | |
230 | if (! (options & GET_DEVS)) | |
231 | return sra; | |
232 | ||
233 | /* Get all the devices as well */ | |
234 | *base = 0; | |
235 | dir = opendir(fname); | |
236 | if (!dir) | |
237 | goto abort; | |
7e0f6979 | 238 | sra->array.spare_disks = 0; |
e86c9dd6 NB |
239 | |
240 | while ((de = readdir(dir)) != NULL) { | |
241 | char *ep; | |
242 | if (de->d_ino == 0 || | |
243 | strncmp(de->d_name, "dev-", 4) != 0) | |
244 | continue; | |
245 | strcpy(base, de->d_name); | |
246 | dbase = base + strlen(base); | |
247 | *dbase++ = '/'; | |
248 | ||
249 | dev = malloc(sizeof(*dev)); | |
250 | if (!dev) | |
251 | goto abort; | |
e86c9dd6 NB |
252 | |
253 | /* Always get slot, major, minor */ | |
254 | strcpy(dbase, "slot"); | |
4795982e DW |
255 | if (load_sys(fname, buf)) { |
256 | /* hmm... unable to read 'slot' maybe the device | |
257 | * is going away? | |
258 | */ | |
259 | strcpy(dbase, "block"); | |
260 | if (readlink(fname, buf, sizeof(buf)) < 0 && | |
261 | errno != ENAMETOOLONG) { | |
262 | /* ...yup device is gone */ | |
263 | free(dev); | |
264 | continue; | |
265 | } else { | |
266 | /* slot is unreadable but 'block' link | |
267 | * still intact... something bad is happening | |
268 | * so abort | |
269 | */ | |
270 | free(dev); | |
271 | goto abort; | |
272 | } | |
273 | ||
274 | } | |
275 | dev->next = sra->devs; | |
276 | sra->devs = dev; | |
277 | ||
278 | strcpy(dev->sys_name, de->d_name); | |
06c7f68e NB |
279 | dev->disk.raid_disk = strtoul(buf, &ep, 10); |
280 | if (*ep) dev->disk.raid_disk = -1; | |
e86c9dd6 NB |
281 | |
282 | strcpy(dbase, "block/dev"); | |
283 | if (load_sys(fname, buf)) | |
284 | goto abort; | |
06c7f68e | 285 | sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor); |
e86c9dd6 NB |
286 | |
287 | if (options & GET_OFFSET) { | |
288 | strcpy(dbase, "offset"); | |
289 | if (load_sys(fname, buf)) | |
290 | goto abort; | |
06c7f68e | 291 | dev->data_offset = strtoull(buf, NULL, 0); |
e86c9dd6 NB |
292 | } |
293 | if (options & GET_SIZE) { | |
294 | strcpy(dbase, "size"); | |
295 | if (load_sys(fname, buf)) | |
296 | goto abort; | |
047d2e49 | 297 | dev->component_size = strtoull(buf, NULL, 0) * 2; |
e86c9dd6 NB |
298 | } |
299 | if (options & GET_STATE) { | |
06c7f68e | 300 | dev->disk.state = 0; |
e86c9dd6 NB |
301 | strcpy(dbase, "state"); |
302 | if (load_sys(fname, buf)) | |
303 | goto abort; | |
304 | if (strstr(buf, "in_sync")) | |
06c7f68e | 305 | dev->disk.state |= (1<<MD_DISK_SYNC); |
e86c9dd6 | 306 | if (strstr(buf, "faulty")) |
06c7f68e NB |
307 | dev->disk.state |= (1<<MD_DISK_FAULTY); |
308 | if (dev->disk.state == 0) | |
7e0f6979 | 309 | sra->array.spare_disks++; |
e86c9dd6 NB |
310 | } |
311 | if (options & GET_ERROR) { | |
312 | strcpy(buf, "errors"); | |
313 | if (load_sys(fname, buf)) | |
314 | goto abort; | |
315 | dev->errors = strtoul(buf, NULL, 0); | |
316 | } | |
317 | } | |
355726fa | 318 | closedir(dir); |
e86c9dd6 NB |
319 | return sra; |
320 | ||
321 | abort: | |
355726fa NB |
322 | if (dir) |
323 | closedir(dir); | |
8382f19b | 324 | sysfs_free(sra); |
e86c9dd6 NB |
325 | return NULL; |
326 | } | |
327 | ||
1770662b DW |
328 | int sysfs_attr_match(const char *attr, const char *str) |
329 | { | |
330 | /* See if attr, read from a sysfs file, matches | |
331 | * str. They must either be the same, or attr can | |
332 | * have a trailing newline or comma | |
333 | */ | |
334 | while (*attr && *str && *attr == *str) { | |
335 | attr++; | |
336 | str++; | |
337 | } | |
338 | ||
339 | if (*str || (*attr && *attr != ',' && *attr != '\n')) | |
340 | return 0; | |
341 | return 1; | |
342 | } | |
343 | ||
344 | int sysfs_match_word(const char *word, char **list) | |
345 | { | |
346 | int n; | |
347 | for (n=0; list[n]; n++) | |
348 | if (sysfs_attr_match(word, list[n])) | |
349 | break; | |
350 | return n; | |
351 | } | |
352 | ||
e86c9dd6 NB |
353 | unsigned long long get_component_size(int fd) |
354 | { | |
355 | /* Find out the component size of the array. | |
356 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
357 | * size field is only 32bits. | |
358 | * So look in /sys/block/mdXXX/md/component_size | |
353632d9 | 359 | * |
8686f3ed | 360 | * This returns in units of sectors. |
e86c9dd6 NB |
361 | */ |
362 | struct stat stb; | |
363 | char fname[50]; | |
364 | int n; | |
365 | if (fstat(fd, &stb)) return 0; | |
4ebd3237 | 366 | if (major(stb.st_rdev) != get_mdp_major()) |
e86c9dd6 | 367 | sprintf(fname, "/sys/block/md%d/md/component_size", |
ea24acd0 | 368 | (int)minor(stb.st_rdev)); |
e86c9dd6 NB |
369 | else |
370 | sprintf(fname, "/sys/block/md_d%d/md/component_size", | |
ea24acd0 | 371 | (int)minor(stb.st_rdev)>>MdpMinorShift); |
e86c9dd6 NB |
372 | fd = open(fname, O_RDONLY); |
373 | if (fd < 0) | |
374 | return 0; | |
375 | n = read(fd, fname, sizeof(fname)); | |
376 | close(fd); | |
377 | if (n == sizeof(fname)) | |
378 | return 0; | |
379 | fname[n] = 0; | |
8686f3ed | 380 | return strtoull(fname, NULL, 10) * 2; |
e86c9dd6 NB |
381 | } |
382 | ||
7e0f6979 | 383 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
384 | char *name, char *val) |
385 | { | |
386 | char fname[50]; | |
387 | int n; | |
388 | int fd; | |
7e1432fb | 389 | |
e86c9dd6 | 390 | sprintf(fname, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 391 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
392 | fd = open(fname, O_WRONLY); |
393 | if (fd < 0) | |
394 | return -1; | |
395 | n = write(fd, val, strlen(val)); | |
396 | close(fd); | |
2a24d7b6 DW |
397 | if (n != strlen(val)) { |
398 | dprintf(Name ": failed to write '%s' to '%s' (%s)\n", | |
399 | val, fname, strerror(errno)); | |
e86c9dd6 | 400 | return -1; |
2a24d7b6 | 401 | } |
e86c9dd6 NB |
402 | return 0; |
403 | } | |
404 | ||
7e0f6979 | 405 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
406 | char *name, unsigned long long val) |
407 | { | |
408 | char valstr[50]; | |
409 | sprintf(valstr, "%llu", val); | |
410 | return sysfs_set_str(sra, dev, name, valstr); | |
411 | } | |
412 | ||
97590376 N |
413 | int sysfs_uevent(struct mdinfo *sra, char *event) |
414 | { | |
415 | char fname[50]; | |
416 | int n; | |
417 | int fd; | |
418 | ||
419 | sprintf(fname, "/sys/block/%s/uevent", | |
420 | sra->sys_name); | |
421 | fd = open(fname, O_WRONLY); | |
422 | if (fd < 0) | |
423 | return -1; | |
424 | n = write(fd, event, strlen(event)); | |
425 | close(fd); | |
426 | return 0; | |
427 | } | |
428 | ||
7e0f6979 | 429 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
430 | char *name, unsigned long long *val) |
431 | { | |
432 | char fname[50]; | |
433 | char buf[50]; | |
434 | int n; | |
435 | int fd; | |
436 | char *ep; | |
437 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
7e0f6979 | 438 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
439 | fd = open(fname, O_RDONLY); |
440 | if (fd < 0) | |
441 | return -1; | |
442 | n = read(fd, buf, sizeof(buf)); | |
443 | close(fd); | |
444 | if (n <= 0) | |
445 | return -1; | |
446 | buf[n] = 0; | |
447 | *val = strtoull(buf, &ep, 0); | |
448 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
449 | return -1; | |
450 | return 0; | |
451 | } | |
2503d23b | 452 | |
8ed3e5e1 DW |
453 | int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms) |
454 | { | |
455 | unsigned long sec; | |
456 | unsigned long msec; | |
457 | char delay[30]; | |
458 | ||
459 | sec = ms / 1000; | |
0dd3ba30 | 460 | msec = ms % 1000; |
8ed3e5e1 | 461 | |
0dd3ba30 DW |
462 | sprintf(delay, "%ld.%03ld\n", sec, msec); |
463 | /* this '\n' ^ needed for kernels older than 2.6.28 */ | |
8ed3e5e1 DW |
464 | return sysfs_set_str(sra, NULL, "safe_mode_delay", delay); |
465 | } | |
466 | ||
f35f2525 | 467 | int sysfs_set_array(struct mdinfo *info, int vers) |
2503d23b NB |
468 | { |
469 | int rv = 0; | |
f35f2525 N |
470 | char ver[100]; |
471 | ||
472 | ver[0] = 0; | |
473 | if (info->array.major_version == -1 && | |
474 | info->array.minor_version == -2) { | |
475 | strcat(strcpy(ver, "external:"), info->text_version); | |
476 | ||
477 | if ((vers % 100) < 2 || | |
478 | sysfs_set_str(info, NULL, "metadata_version", | |
479 | ver) < 0) { | |
480 | fprintf(stderr, Name ": This kernel does not " | |
481 | "support external metadata.\n"); | |
482 | return 1; | |
483 | } | |
484 | } | |
2503d23b NB |
485 | if (info->array.level < 0) |
486 | return 0; /* FIXME */ | |
f35f2525 | 487 | rv |= sysfs_set_str(info, NULL, "level", |
2503d23b | 488 | map_num(pers, info->array.level)); |
f35f2525 N |
489 | rv |= sysfs_set_num(info, NULL, "raid_disks", info->array.raid_disks); |
490 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size); | |
491 | rv |= sysfs_set_num(info, NULL, "layout", info->array.layout); | |
492 | rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2); | |
493 | if (info->array.level > 0) | |
494 | rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start); | |
2503d23b NB |
495 | return rv; |
496 | } | |
497 | ||
2318b9f0 | 498 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd) |
2503d23b NB |
499 | { |
500 | char dv[100]; | |
501 | char nm[100]; | |
2503d23b NB |
502 | char *dname; |
503 | int rv; | |
504 | ||
505 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
506 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
507 | if (rv) | |
508 | return rv; | |
509 | ||
510 | memset(nm, 0, sizeof(nm)); | |
511 | sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor); | |
73649188 N |
512 | rv = readlink(dv, nm, sizeof(nm)); |
513 | if (rv <= 0) | |
2503d23b | 514 | return -1; |
73649188 | 515 | nm[rv] = '\0'; |
2503d23b NB |
516 | dname = strrchr(nm, '/'); |
517 | if (dname) dname++; | |
518 | strcpy(sd->sys_name, "dev-"); | |
519 | strcpy(sd->sys_name+4, dname); | |
520 | ||
73649188 | 521 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); |
2503d23b NB |
522 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); |
523 | if (sra->array.level != LEVEL_CONTAINER) { | |
524 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
525 | // rv |= sysfs_set_str(sra, sd, "state", "in_sync"); | |
526 | } | |
2503d23b NB |
527 | return rv; |
528 | } | |
90c8b707 | 529 | |
755c99fa | 530 | #if 0 |
90c8b707 DW |
531 | int sysfs_disk_to_sg(int fd) |
532 | { | |
533 | /* from an open block device, try find and open its corresponding | |
534 | * scsi_generic interface | |
535 | */ | |
536 | struct stat st; | |
537 | char path[256]; | |
538 | char sg_path[256]; | |
539 | char sg_major_minor[8]; | |
540 | char *c; | |
541 | DIR *dir; | |
542 | struct dirent *de; | |
543 | int major, minor, rv; | |
544 | ||
545 | if (fstat(fd, &st)) | |
546 | return -1; | |
547 | ||
548 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
549 | major(st.st_rdev), minor(st.st_rdev)); | |
550 | ||
551 | dir = opendir(path); | |
552 | if (!dir) | |
553 | return -1; | |
554 | ||
555 | de = readdir(dir); | |
556 | while (de) { | |
557 | if (strncmp("scsi_generic:", de->d_name, | |
558 | strlen("scsi_generic:")) == 0) | |
559 | break; | |
560 | de = readdir(dir); | |
561 | } | |
562 | closedir(dir); | |
563 | ||
564 | if (!de) | |
565 | return -1; | |
566 | ||
567 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
568 | fd = open(sg_path, O_RDONLY); | |
569 | if (fd < 0) | |
570 | return fd; | |
571 | ||
572 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
573 | close(fd); | |
574 | if (rv < 0) | |
575 | return -1; | |
576 | else | |
577 | sg_major_minor[rv - 1] = '\0'; | |
578 | ||
579 | c = strchr(sg_major_minor, ':'); | |
580 | *c = '\0'; | |
581 | c++; | |
582 | major = strtol(sg_major_minor, NULL, 10); | |
583 | minor = strtol(c, NULL, 10); | |
584 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
585 | (int) getpid(), major, minor); | |
586 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
587 | fd = open(path, O_RDONLY); | |
588 | unlink(path); | |
589 | return fd; | |
590 | } | |
591 | ||
592 | return -1; | |
593 | } | |
755c99fa | 594 | #endif |
90c8b707 | 595 | |
f1665f72 DW |
596 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) |
597 | { | |
598 | /* from an open block device, try to retrieve it scsi_id */ | |
599 | struct stat st; | |
600 | char path[256]; | |
601 | char *c1, *c2; | |
602 | DIR *dir; | |
603 | struct dirent *de; | |
604 | ||
605 | if (fstat(fd, &st)) | |
606 | return 1; | |
607 | ||
608 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
609 | major(st.st_rdev), minor(st.st_rdev)); | |
610 | ||
611 | dir = opendir(path); | |
612 | if (!dir) | |
613 | return 1; | |
614 | ||
615 | de = readdir(dir); | |
616 | while (de) { | |
617 | if (strncmp("scsi_disk:", de->d_name, | |
618 | strlen("scsi_disk:")) == 0) | |
619 | break; | |
620 | de = readdir(dir); | |
621 | } | |
622 | closedir(dir); | |
623 | ||
624 | if (!de) | |
625 | return 1; | |
626 | ||
627 | c1 = strchr(de->d_name, ':'); | |
628 | c1++; | |
629 | c2 = strchr(c1, ':'); | |
630 | *c2 = '\0'; | |
631 | *id = strtol(c1, NULL, 10) << 24; /* host */ | |
632 | c1 = c2 + 1; | |
633 | c2 = strchr(c1, ':'); | |
634 | *c2 = '\0'; | |
635 | *id |= strtol(c1, NULL, 10) << 16; /* channel */ | |
636 | c1 = c2 + 1; | |
637 | c2 = strchr(c1, ':'); | |
638 | *c2 = '\0'; | |
639 | *id |= strtol(c1, NULL, 10) << 8; /* lun */ | |
640 | c1 = c2 + 1; | |
641 | *id |= strtol(c1, NULL, 10); /* id */ | |
642 | ||
643 | return 0; | |
644 | } | |
f94d52f4 NB |
645 | |
646 | ||
647 | int sysfs_unique_holder(int devnum, long rdev) | |
648 | { | |
649 | /* Check that devnum is a holder of rdev, | |
650 | * and is the only holder. | |
651 | * we should be locked against races by | |
652 | * an O_EXCL on devnum | |
653 | */ | |
654 | DIR *dir; | |
655 | struct dirent *de; | |
656 | char dirname[100]; | |
657 | char l; | |
658 | int found = 0; | |
659 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", | |
660 | major(rdev), minor(rdev)); | |
661 | dir = opendir(dirname); | |
662 | errno = ENOENT; | |
663 | if (!dir) | |
664 | return 0; | |
665 | l = strlen(dirname); | |
666 | while ((de = readdir(dir)) != NULL) { | |
667 | char buf[10]; | |
668 | int n; | |
669 | int mj, mn; | |
670 | char c; | |
671 | int fd; | |
672 | ||
673 | if (de->d_ino == 0) | |
674 | continue; | |
675 | if (de->d_name[0] == '.') | |
676 | continue; | |
677 | strcpy(dirname+l, "/"); | |
678 | strcat(dirname+l, de->d_name); | |
679 | strcat(dirname+l, "/dev"); | |
680 | fd = open(dirname, O_RDONLY); | |
681 | if (fd < 0) { | |
682 | errno = ENOENT; | |
683 | break; | |
684 | } | |
685 | n = read(fd, buf, sizeof(buf)-1); | |
686 | close(fd); | |
687 | buf[n] = 0; | |
688 | if (sscanf(buf, "%d:%d%c", &mj, &mn, &c) != 3 || | |
689 | c != '\n') { | |
690 | errno = ENOENT; | |
691 | break; | |
692 | } | |
693 | if (mj != MD_MAJOR) | |
694 | mn = -1-(mn>>6); | |
695 | ||
696 | if (devnum != mn) { | |
697 | errno = EEXIST; | |
698 | break; | |
699 | } | |
700 | found = 1; | |
701 | } | |
702 | closedir(dir); | |
703 | if (de) | |
704 | return 0; | |
705 | else | |
706 | return found; | |
707 | } |