]>
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; |
549e9569 | 64 | |
77472ff8 | 65 | sprintf(fname, "/sys/block/%s/md/", devnum2devname(devnum)); |
549e9569 NB |
66 | if (devname) { |
67 | strcat(fname, devname); | |
68 | strcat(fname, "/"); | |
69 | } | |
70 | strcat(fname, attr); | |
71 | fd = open(fname, O_RDWR); | |
ea6d09b0 | 72 | if (fd < 0 && errno == EACCES) |
549e9569 NB |
73 | fd = open(fname, O_RDONLY); |
74 | return fd; | |
75 | } | |
76 | ||
f35f2525 N |
77 | void sysfs_init(struct mdinfo *mdi, int fd, int devnum) |
78 | { | |
79 | if (fd >= 0) { | |
80 | struct stat stb; | |
81 | mdu_version_t vers; | |
82 | if (fstat(fd, &stb)) | |
83 | return; | |
84 | if (ioctl(fd, RAID_VERSION, &vers) != 0) | |
85 | return; | |
86 | if (major(stb.st_rdev)==9) | |
87 | sprintf(mdi->sys_name, "md%d", (int)minor(stb.st_rdev)); | |
88 | else | |
89 | sprintf(mdi->sys_name, "md_d%d", | |
90 | (int)minor(stb.st_rdev)>>MdpMinorShift); | |
91 | } else { | |
92 | if (devnum >= 0) | |
93 | sprintf(mdi->sys_name, "md%d", devnum); | |
94 | else | |
95 | sprintf(mdi->sys_name, "md_d%d", | |
96 | -1-devnum); | |
97 | } | |
98 | } | |
99 | ||
7e0f6979 | 100 | struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options) |
e86c9dd6 NB |
101 | { |
102 | /* Longest possible name in sysfs, mounted at /sys, is | |
103 | * /sys/block/md_dXXX/md/dev-XXXXX/block/dev | |
104 | * /sys/block/md_dXXX/md/metadata_version | |
105 | * which is about 41 characters. 50 should do for now | |
106 | */ | |
107 | char fname[50]; | |
108 | char buf[1024]; | |
109 | char *base; | |
110 | char *dbase; | |
7e0f6979 | 111 | struct mdinfo *sra; |
06c7f68e | 112 | struct mdinfo *dev; |
355726fa | 113 | DIR *dir = NULL; |
e86c9dd6 NB |
114 | struct dirent *de; |
115 | ||
116 | sra = malloc(sizeof(*sra)); | |
117 | if (sra == NULL) | |
118 | return sra; | |
f35f2525 N |
119 | memset(sra, 0, sizeof(*sra)); |
120 | sysfs_init(sra, fd, devnum); | |
e86c9dd6 | 121 | |
7e0f6979 | 122 | sprintf(fname, "/sys/block/%s/md/", sra->sys_name); |
e86c9dd6 NB |
123 | base = fname + strlen(fname); |
124 | ||
125 | sra->devs = NULL; | |
8382f19b NB |
126 | if (options & GET_VERSION) { |
127 | strcpy(base, "metadata_version"); | |
128 | if (load_sys(fname, buf)) | |
129 | goto abort; | |
294d6f45 | 130 | if (strncmp(buf, "none", 4) == 0) { |
7e0f6979 NB |
131 | sra->array.major_version = |
132 | sra->array.minor_version = -1; | |
294d6f45 NB |
133 | strcpy(sra->text_version, ""); |
134 | } else if (strncmp(buf, "external:", 9) == 0) { | |
142cb9e1 NB |
135 | sra->array.major_version = -1; |
136 | sra->array.minor_version = -2; | |
137 | strcpy(sra->text_version, buf+9); | |
b8ac1967 | 138 | } else { |
8382f19b | 139 | sscanf(buf, "%d.%d", |
7e0f6979 NB |
140 | &sra->array.major_version, |
141 | &sra->array.minor_version); | |
b8ac1967 NB |
142 | strcpy(sra->text_version, buf); |
143 | } | |
8382f19b | 144 | } |
e86c9dd6 NB |
145 | if (options & GET_LEVEL) { |
146 | strcpy(base, "level"); | |
147 | if (load_sys(fname, buf)) | |
148 | goto abort; | |
7e0f6979 | 149 | sra->array.level = map_name(pers, buf); |
e86c9dd6 NB |
150 | } |
151 | if (options & GET_LAYOUT) { | |
152 | strcpy(base, "layout"); | |
153 | if (load_sys(fname, buf)) | |
154 | goto abort; | |
7e0f6979 | 155 | sra->array.layout = strtoul(buf, NULL, 0); |
e86c9dd6 | 156 | } |
549e9569 NB |
157 | if (options & GET_DISKS) { |
158 | strcpy(base, "raid_disks"); | |
159 | if (load_sys(fname, buf)) | |
160 | goto abort; | |
161 | sra->array.raid_disks = strtoul(buf, NULL, 0); | |
f1d26766 DW |
162 | } |
163 | if (options & GET_DEGRADED) { | |
164 | strcpy(base, "degraded"); | |
165 | if (load_sys(fname, buf)) | |
166 | goto abort; | |
167 | sra->array.failed_disks = strtoul(buf, NULL, 0); | |
549e9569 | 168 | } |
e86c9dd6 NB |
169 | if (options & GET_COMPONENT) { |
170 | strcpy(base, "component_size"); | |
171 | if (load_sys(fname, buf)) | |
172 | goto abort; | |
173 | sra->component_size = strtoull(buf, NULL, 0); | |
353632d9 NB |
174 | /* sysfs reports "K", but we want sectors */ |
175 | sra->component_size *= 2; | |
e86c9dd6 NB |
176 | } |
177 | if (options & GET_CHUNK) { | |
178 | strcpy(base, "chunk_size"); | |
179 | if (load_sys(fname, buf)) | |
180 | goto abort; | |
7e0f6979 | 181 | sra->array.chunk_size = strtoul(buf, NULL, 0); |
e86c9dd6 | 182 | } |
758d3a8e NB |
183 | if (options & GET_CACHE) { |
184 | strcpy(base, "stripe_cache_size"); | |
185 | if (load_sys(fname, buf)) | |
186 | goto abort; | |
187 | sra->cache_size = strtoul(buf, NULL, 0); | |
188 | } | |
37dfc3d6 NB |
189 | if (options & GET_MISMATCH) { |
190 | strcpy(base, "mismatch_cnt"); | |
191 | if (load_sys(fname, buf)) | |
192 | goto abort; | |
193 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
194 | } | |
1770662b DW |
195 | if (options & GET_SAFEMODE) { |
196 | int scale = 1; | |
197 | int dot = 0; | |
198 | int i; | |
199 | unsigned long msec; | |
200 | size_t len; | |
201 | ||
202 | strcpy(base, "safe_mode_delay"); | |
203 | if (load_sys(fname, buf)) | |
204 | goto abort; | |
205 | ||
206 | /* remove a period, and count digits after it */ | |
207 | len = strlen(buf); | |
208 | for (i = 0; i < len; i++) { | |
209 | if (dot) { | |
210 | if (isdigit(buf[i])) { | |
211 | buf[i-1] = buf[i]; | |
212 | scale *= 10; | |
213 | } | |
214 | buf[i] = 0; | |
215 | } else if (buf[i] == '.') { | |
216 | dot=1; | |
217 | buf[i] = 0; | |
218 | } | |
219 | } | |
220 | msec = strtoul(buf, NULL, 10); | |
221 | msec = (msec * 1000) / scale; | |
222 | sra->safe_mode_delay = msec; | |
223 | } | |
e86c9dd6 NB |
224 | |
225 | if (! (options & GET_DEVS)) | |
226 | return sra; | |
227 | ||
228 | /* Get all the devices as well */ | |
229 | *base = 0; | |
230 | dir = opendir(fname); | |
231 | if (!dir) | |
232 | goto abort; | |
7e0f6979 | 233 | sra->array.spare_disks = 0; |
e86c9dd6 NB |
234 | |
235 | while ((de = readdir(dir)) != NULL) { | |
236 | char *ep; | |
237 | if (de->d_ino == 0 || | |
238 | strncmp(de->d_name, "dev-", 4) != 0) | |
239 | continue; | |
240 | strcpy(base, de->d_name); | |
241 | dbase = base + strlen(base); | |
242 | *dbase++ = '/'; | |
243 | ||
244 | dev = malloc(sizeof(*dev)); | |
245 | if (!dev) | |
246 | goto abort; | |
e86c9dd6 NB |
247 | |
248 | /* Always get slot, major, minor */ | |
249 | strcpy(dbase, "slot"); | |
4795982e DW |
250 | if (load_sys(fname, buf)) { |
251 | /* hmm... unable to read 'slot' maybe the device | |
252 | * is going away? | |
253 | */ | |
254 | strcpy(dbase, "block"); | |
255 | if (readlink(fname, buf, sizeof(buf)) < 0 && | |
256 | errno != ENAMETOOLONG) { | |
257 | /* ...yup device is gone */ | |
258 | free(dev); | |
259 | continue; | |
260 | } else { | |
261 | /* slot is unreadable but 'block' link | |
262 | * still intact... something bad is happening | |
263 | * so abort | |
264 | */ | |
265 | free(dev); | |
266 | goto abort; | |
267 | } | |
268 | ||
269 | } | |
270 | dev->next = sra->devs; | |
271 | sra->devs = dev; | |
272 | ||
273 | strcpy(dev->sys_name, de->d_name); | |
06c7f68e NB |
274 | dev->disk.raid_disk = strtoul(buf, &ep, 10); |
275 | if (*ep) dev->disk.raid_disk = -1; | |
e86c9dd6 NB |
276 | |
277 | strcpy(dbase, "block/dev"); | |
278 | if (load_sys(fname, buf)) | |
279 | goto abort; | |
06c7f68e | 280 | sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor); |
e86c9dd6 NB |
281 | |
282 | if (options & GET_OFFSET) { | |
283 | strcpy(dbase, "offset"); | |
284 | if (load_sys(fname, buf)) | |
285 | goto abort; | |
06c7f68e | 286 | dev->data_offset = strtoull(buf, NULL, 0); |
e86c9dd6 NB |
287 | } |
288 | if (options & GET_SIZE) { | |
289 | strcpy(dbase, "size"); | |
290 | if (load_sys(fname, buf)) | |
291 | goto abort; | |
047d2e49 | 292 | dev->component_size = strtoull(buf, NULL, 0) * 2; |
e86c9dd6 NB |
293 | } |
294 | if (options & GET_STATE) { | |
06c7f68e | 295 | dev->disk.state = 0; |
e86c9dd6 NB |
296 | strcpy(dbase, "state"); |
297 | if (load_sys(fname, buf)) | |
298 | goto abort; | |
299 | if (strstr(buf, "in_sync")) | |
06c7f68e | 300 | dev->disk.state |= (1<<MD_DISK_SYNC); |
e86c9dd6 | 301 | if (strstr(buf, "faulty")) |
06c7f68e NB |
302 | dev->disk.state |= (1<<MD_DISK_FAULTY); |
303 | if (dev->disk.state == 0) | |
7e0f6979 | 304 | sra->array.spare_disks++; |
e86c9dd6 NB |
305 | } |
306 | if (options & GET_ERROR) { | |
307 | strcpy(buf, "errors"); | |
308 | if (load_sys(fname, buf)) | |
309 | goto abort; | |
310 | dev->errors = strtoul(buf, NULL, 0); | |
311 | } | |
312 | } | |
355726fa | 313 | closedir(dir); |
e86c9dd6 NB |
314 | return sra; |
315 | ||
316 | abort: | |
355726fa NB |
317 | if (dir) |
318 | closedir(dir); | |
8382f19b | 319 | sysfs_free(sra); |
e86c9dd6 NB |
320 | return NULL; |
321 | } | |
322 | ||
1770662b DW |
323 | int sysfs_attr_match(const char *attr, const char *str) |
324 | { | |
325 | /* See if attr, read from a sysfs file, matches | |
326 | * str. They must either be the same, or attr can | |
327 | * have a trailing newline or comma | |
328 | */ | |
329 | while (*attr && *str && *attr == *str) { | |
330 | attr++; | |
331 | str++; | |
332 | } | |
333 | ||
334 | if (*str || (*attr && *attr != ',' && *attr != '\n')) | |
335 | return 0; | |
336 | return 1; | |
337 | } | |
338 | ||
339 | int sysfs_match_word(const char *word, char **list) | |
340 | { | |
341 | int n; | |
342 | for (n=0; list[n]; n++) | |
343 | if (sysfs_attr_match(word, list[n])) | |
344 | break; | |
345 | return n; | |
346 | } | |
347 | ||
e86c9dd6 NB |
348 | unsigned long long get_component_size(int fd) |
349 | { | |
350 | /* Find out the component size of the array. | |
351 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
352 | * size field is only 32bits. | |
353 | * So look in /sys/block/mdXXX/md/component_size | |
353632d9 | 354 | * |
8686f3ed | 355 | * This returns in units of sectors. |
e86c9dd6 NB |
356 | */ |
357 | struct stat stb; | |
358 | char fname[50]; | |
359 | int n; | |
360 | if (fstat(fd, &stb)) return 0; | |
361 | if (major(stb.st_rdev) == 9) | |
362 | sprintf(fname, "/sys/block/md%d/md/component_size", | |
ea24acd0 | 363 | (int)minor(stb.st_rdev)); |
e86c9dd6 NB |
364 | else |
365 | sprintf(fname, "/sys/block/md_d%d/md/component_size", | |
ea24acd0 | 366 | (int)minor(stb.st_rdev)>>MdpMinorShift); |
e86c9dd6 NB |
367 | fd = open(fname, O_RDONLY); |
368 | if (fd < 0) | |
369 | return 0; | |
370 | n = read(fd, fname, sizeof(fname)); | |
371 | close(fd); | |
372 | if (n == sizeof(fname)) | |
373 | return 0; | |
374 | fname[n] = 0; | |
8686f3ed | 375 | return strtoull(fname, NULL, 10) * 2; |
e86c9dd6 NB |
376 | } |
377 | ||
7e0f6979 | 378 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
379 | char *name, char *val) |
380 | { | |
381 | char fname[50]; | |
382 | int n; | |
383 | int fd; | |
7e1432fb | 384 | |
e86c9dd6 | 385 | sprintf(fname, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 386 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
387 | fd = open(fname, O_WRONLY); |
388 | if (fd < 0) | |
389 | return -1; | |
390 | n = write(fd, val, strlen(val)); | |
391 | close(fd); | |
392 | if (n != strlen(val)) | |
393 | return -1; | |
394 | return 0; | |
395 | } | |
396 | ||
7e0f6979 | 397 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
398 | char *name, unsigned long long val) |
399 | { | |
400 | char valstr[50]; | |
401 | sprintf(valstr, "%llu", val); | |
402 | return sysfs_set_str(sra, dev, name, valstr); | |
403 | } | |
404 | ||
7e0f6979 | 405 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
406 | char *name, unsigned long long *val) |
407 | { | |
408 | char fname[50]; | |
409 | char buf[50]; | |
410 | int n; | |
411 | int fd; | |
412 | char *ep; | |
413 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
7e0f6979 | 414 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
415 | fd = open(fname, O_RDONLY); |
416 | if (fd < 0) | |
417 | return -1; | |
418 | n = read(fd, buf, sizeof(buf)); | |
419 | close(fd); | |
420 | if (n <= 0) | |
421 | return -1; | |
422 | buf[n] = 0; | |
423 | *val = strtoull(buf, &ep, 0); | |
424 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
425 | return -1; | |
426 | return 0; | |
427 | } | |
2503d23b | 428 | |
8ed3e5e1 DW |
429 | int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms) |
430 | { | |
431 | unsigned long sec; | |
432 | unsigned long msec; | |
433 | char delay[30]; | |
434 | ||
435 | sec = ms / 1000; | |
436 | msec = ms - (sec * 1000); | |
437 | ||
438 | sprintf(delay, "%ld.%ld", sec, msec); | |
439 | return sysfs_set_str(sra, NULL, "safe_mode_delay", delay); | |
440 | } | |
441 | ||
f35f2525 | 442 | int sysfs_set_array(struct mdinfo *info, int vers) |
2503d23b NB |
443 | { |
444 | int rv = 0; | |
f35f2525 N |
445 | char ver[100]; |
446 | ||
447 | ver[0] = 0; | |
448 | if (info->array.major_version == -1 && | |
449 | info->array.minor_version == -2) { | |
450 | strcat(strcpy(ver, "external:"), info->text_version); | |
451 | ||
452 | if ((vers % 100) < 2 || | |
453 | sysfs_set_str(info, NULL, "metadata_version", | |
454 | ver) < 0) { | |
455 | fprintf(stderr, Name ": This kernel does not " | |
456 | "support external metadata.\n"); | |
457 | return 1; | |
458 | } | |
459 | } | |
2503d23b NB |
460 | if (info->array.level < 0) |
461 | return 0; /* FIXME */ | |
f35f2525 | 462 | rv |= sysfs_set_str(info, NULL, "level", |
2503d23b | 463 | map_num(pers, info->array.level)); |
f35f2525 N |
464 | rv |= sysfs_set_num(info, NULL, "raid_disks", info->array.raid_disks); |
465 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size); | |
466 | rv |= sysfs_set_num(info, NULL, "layout", info->array.layout); | |
467 | rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2); | |
468 | if (info->array.level > 0) | |
469 | rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start); | |
2503d23b NB |
470 | return rv; |
471 | } | |
472 | ||
2318b9f0 | 473 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd) |
2503d23b NB |
474 | { |
475 | char dv[100]; | |
476 | char nm[100]; | |
2503d23b NB |
477 | char *dname; |
478 | int rv; | |
479 | ||
480 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
481 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
482 | if (rv) | |
483 | return rv; | |
484 | ||
485 | memset(nm, 0, sizeof(nm)); | |
486 | sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor); | |
73649188 N |
487 | rv = readlink(dv, nm, sizeof(nm)); |
488 | if (rv <= 0) | |
2503d23b | 489 | return -1; |
73649188 | 490 | nm[rv] = '\0'; |
2503d23b NB |
491 | dname = strrchr(nm, '/'); |
492 | if (dname) dname++; | |
493 | strcpy(sd->sys_name, "dev-"); | |
494 | strcpy(sd->sys_name+4, dname); | |
495 | ||
73649188 | 496 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); |
2503d23b NB |
497 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); |
498 | if (sra->array.level != LEVEL_CONTAINER) { | |
499 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
500 | // rv |= sysfs_set_str(sra, sd, "state", "in_sync"); | |
501 | } | |
2503d23b NB |
502 | return rv; |
503 | } | |
90c8b707 | 504 | |
755c99fa | 505 | #if 0 |
90c8b707 DW |
506 | int sysfs_disk_to_sg(int fd) |
507 | { | |
508 | /* from an open block device, try find and open its corresponding | |
509 | * scsi_generic interface | |
510 | */ | |
511 | struct stat st; | |
512 | char path[256]; | |
513 | char sg_path[256]; | |
514 | char sg_major_minor[8]; | |
515 | char *c; | |
516 | DIR *dir; | |
517 | struct dirent *de; | |
518 | int major, minor, rv; | |
519 | ||
520 | if (fstat(fd, &st)) | |
521 | return -1; | |
522 | ||
523 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
524 | major(st.st_rdev), minor(st.st_rdev)); | |
525 | ||
526 | dir = opendir(path); | |
527 | if (!dir) | |
528 | return -1; | |
529 | ||
530 | de = readdir(dir); | |
531 | while (de) { | |
532 | if (strncmp("scsi_generic:", de->d_name, | |
533 | strlen("scsi_generic:")) == 0) | |
534 | break; | |
535 | de = readdir(dir); | |
536 | } | |
537 | closedir(dir); | |
538 | ||
539 | if (!de) | |
540 | return -1; | |
541 | ||
542 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
543 | fd = open(sg_path, O_RDONLY); | |
544 | if (fd < 0) | |
545 | return fd; | |
546 | ||
547 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
548 | close(fd); | |
549 | if (rv < 0) | |
550 | return -1; | |
551 | else | |
552 | sg_major_minor[rv - 1] = '\0'; | |
553 | ||
554 | c = strchr(sg_major_minor, ':'); | |
555 | *c = '\0'; | |
556 | c++; | |
557 | major = strtol(sg_major_minor, NULL, 10); | |
558 | minor = strtol(c, NULL, 10); | |
559 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
560 | (int) getpid(), major, minor); | |
561 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
562 | fd = open(path, O_RDONLY); | |
563 | unlink(path); | |
564 | return fd; | |
565 | } | |
566 | ||
567 | return -1; | |
568 | } | |
755c99fa | 569 | #endif |
90c8b707 | 570 | |
f1665f72 DW |
571 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) |
572 | { | |
573 | /* from an open block device, try to retrieve it scsi_id */ | |
574 | struct stat st; | |
575 | char path[256]; | |
576 | char *c1, *c2; | |
577 | DIR *dir; | |
578 | struct dirent *de; | |
579 | ||
580 | if (fstat(fd, &st)) | |
581 | return 1; | |
582 | ||
583 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
584 | major(st.st_rdev), minor(st.st_rdev)); | |
585 | ||
586 | dir = opendir(path); | |
587 | if (!dir) | |
588 | return 1; | |
589 | ||
590 | de = readdir(dir); | |
591 | while (de) { | |
592 | if (strncmp("scsi_disk:", de->d_name, | |
593 | strlen("scsi_disk:")) == 0) | |
594 | break; | |
595 | de = readdir(dir); | |
596 | } | |
597 | closedir(dir); | |
598 | ||
599 | if (!de) | |
600 | return 1; | |
601 | ||
602 | c1 = strchr(de->d_name, ':'); | |
603 | c1++; | |
604 | c2 = strchr(c1, ':'); | |
605 | *c2 = '\0'; | |
606 | *id = strtol(c1, NULL, 10) << 24; /* host */ | |
607 | c1 = c2 + 1; | |
608 | c2 = strchr(c1, ':'); | |
609 | *c2 = '\0'; | |
610 | *id |= strtol(c1, NULL, 10) << 16; /* channel */ | |
611 | c1 = c2 + 1; | |
612 | c2 = strchr(c1, ':'); | |
613 | *c2 = '\0'; | |
614 | *id |= strtol(c1, NULL, 10) << 8; /* lun */ | |
615 | c1 = c2 + 1; | |
616 | *id |= strtol(c1, NULL, 10); /* id */ | |
617 | ||
618 | return 0; | |
619 | } | |
f94d52f4 NB |
620 | |
621 | ||
622 | int sysfs_unique_holder(int devnum, long rdev) | |
623 | { | |
624 | /* Check that devnum is a holder of rdev, | |
625 | * and is the only holder. | |
626 | * we should be locked against races by | |
627 | * an O_EXCL on devnum | |
628 | */ | |
629 | DIR *dir; | |
630 | struct dirent *de; | |
631 | char dirname[100]; | |
632 | char l; | |
633 | int found = 0; | |
634 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", | |
635 | major(rdev), minor(rdev)); | |
636 | dir = opendir(dirname); | |
637 | errno = ENOENT; | |
638 | if (!dir) | |
639 | return 0; | |
640 | l = strlen(dirname); | |
641 | while ((de = readdir(dir)) != NULL) { | |
642 | char buf[10]; | |
643 | int n; | |
644 | int mj, mn; | |
645 | char c; | |
646 | int fd; | |
647 | ||
648 | if (de->d_ino == 0) | |
649 | continue; | |
650 | if (de->d_name[0] == '.') | |
651 | continue; | |
652 | strcpy(dirname+l, "/"); | |
653 | strcat(dirname+l, de->d_name); | |
654 | strcat(dirname+l, "/dev"); | |
655 | fd = open(dirname, O_RDONLY); | |
656 | if (fd < 0) { | |
657 | errno = ENOENT; | |
658 | break; | |
659 | } | |
660 | n = read(fd, buf, sizeof(buf)-1); | |
661 | close(fd); | |
662 | buf[n] = 0; | |
663 | if (sscanf(buf, "%d:%d%c", &mj, &mn, &c) != 3 || | |
664 | c != '\n') { | |
665 | errno = ENOENT; | |
666 | break; | |
667 | } | |
668 | if (mj != MD_MAJOR) | |
669 | mn = -1-(mn>>6); | |
670 | ||
671 | if (devnum != mn) { | |
672 | errno = EEXIST; | |
673 | break; | |
674 | } | |
675 | found = 1; | |
676 | } | |
677 | closedir(dir); | |
678 | if (de) | |
679 | return 0; | |
680 | else | |
681 | return found; | |
682 | } |