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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> | |
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); | |
2f6079dc | 37 | if (n <0 || n >= 1024) |
e86c9dd6 NB |
38 | return -1; |
39 | buf[n] = 0; | |
8dfb8619 | 40 | if (n && buf[n-1] == '\n') |
e86c9dd6 NB |
41 | buf[n-1] = 0; |
42 | return 0; | |
43 | } | |
44 | ||
7e0f6979 | 45 | void sysfs_free(struct mdinfo *sra) |
8382f19b | 46 | { |
7e0f6979 NB |
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; | |
8382f19b | 56 | } |
8382f19b NB |
57 | } |
58 | ||
549e9569 NB |
59 | int sysfs_open(int devnum, char *devname, char *attr) |
60 | { | |
61 | char fname[50]; | |
549e9569 | 62 | int fd; |
549e9569 | 63 | |
77472ff8 | 64 | sprintf(fname, "/sys/block/%s/md/", devnum2devname(devnum)); |
549e9569 NB |
65 | if (devname) { |
66 | strcat(fname, devname); | |
67 | strcat(fname, "/"); | |
68 | } | |
69 | strcat(fname, attr); | |
70 | fd = open(fname, O_RDWR); | |
ea6d09b0 | 71 | if (fd < 0 && errno == EACCES) |
549e9569 NB |
72 | fd = open(fname, O_RDONLY); |
73 | return fd; | |
74 | } | |
75 | ||
7e0f6979 | 76 | struct mdinfo *sysfs_read(int fd, int devnum, unsigned long options) |
e86c9dd6 NB |
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; | |
7e0f6979 | 87 | struct mdinfo *sra; |
06c7f68e | 88 | struct mdinfo *dev; |
355726fa | 89 | DIR *dir = NULL; |
e86c9dd6 NB |
90 | struct dirent *de; |
91 | ||
92 | sra = malloc(sizeof(*sra)); | |
93 | if (sra == NULL) | |
94 | return sra; | |
7e0f6979 | 95 | sra->next = NULL; |
e86c9dd6 NB |
96 | |
97 | if (fd >= 0) { | |
98 | struct stat stb; | |
2faf1f5f NB |
99 | mdu_version_t vers; |
100 | if (fstat(fd, &stb)) return NULL; | |
101 | if (ioctl(fd, RAID_VERSION, &vers) != 0) | |
102 | return NULL; | |
e86c9dd6 | 103 | if (major(stb.st_rdev)==9) |
ea24acd0 | 104 | sprintf(sra->sys_name, "md%d", (int)minor(stb.st_rdev)); |
e86c9dd6 | 105 | else |
7e0f6979 | 106 | sprintf(sra->sys_name, "md_d%d", |
ea24acd0 | 107 | (int)minor(stb.st_rdev)>>MdpMinorShift); |
e86c9dd6 NB |
108 | } else { |
109 | if (devnum >= 0) | |
7e0f6979 | 110 | sprintf(sra->sys_name, "md%d", devnum); |
e86c9dd6 | 111 | else |
7e0f6979 | 112 | sprintf(sra->sys_name, "md_d%d", |
e86c9dd6 NB |
113 | -1-devnum); |
114 | } | |
7e0f6979 | 115 | sprintf(fname, "/sys/block/%s/md/", sra->sys_name); |
e86c9dd6 NB |
116 | base = fname + strlen(fname); |
117 | ||
118 | sra->devs = NULL; | |
8382f19b NB |
119 | if (options & GET_VERSION) { |
120 | strcpy(base, "metadata_version"); | |
121 | if (load_sys(fname, buf)) | |
122 | goto abort; | |
294d6f45 | 123 | if (strncmp(buf, "none", 4) == 0) { |
7e0f6979 NB |
124 | sra->array.major_version = |
125 | sra->array.minor_version = -1; | |
294d6f45 NB |
126 | strcpy(sra->text_version, ""); |
127 | } else if (strncmp(buf, "external:", 9) == 0) { | |
142cb9e1 NB |
128 | sra->array.major_version = -1; |
129 | sra->array.minor_version = -2; | |
130 | strcpy(sra->text_version, buf+9); | |
b8ac1967 | 131 | } else { |
8382f19b | 132 | sscanf(buf, "%d.%d", |
7e0f6979 NB |
133 | &sra->array.major_version, |
134 | &sra->array.minor_version); | |
b8ac1967 NB |
135 | strcpy(sra->text_version, buf); |
136 | } | |
8382f19b | 137 | } |
e86c9dd6 NB |
138 | if (options & GET_LEVEL) { |
139 | strcpy(base, "level"); | |
140 | if (load_sys(fname, buf)) | |
141 | goto abort; | |
7e0f6979 | 142 | sra->array.level = map_name(pers, buf); |
e86c9dd6 NB |
143 | } |
144 | if (options & GET_LAYOUT) { | |
145 | strcpy(base, "layout"); | |
146 | if (load_sys(fname, buf)) | |
147 | goto abort; | |
7e0f6979 | 148 | sra->array.layout = strtoul(buf, NULL, 0); |
e86c9dd6 | 149 | } |
549e9569 NB |
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); | |
f1d26766 DW |
155 | } |
156 | if (options & GET_DEGRADED) { | |
157 | strcpy(base, "degraded"); | |
158 | if (load_sys(fname, buf)) | |
159 | goto abort; | |
160 | sra->array.failed_disks = strtoul(buf, NULL, 0); | |
549e9569 | 161 | } |
e86c9dd6 NB |
162 | if (options & GET_COMPONENT) { |
163 | strcpy(base, "component_size"); | |
164 | if (load_sys(fname, buf)) | |
165 | goto abort; | |
166 | sra->component_size = strtoull(buf, NULL, 0); | |
353632d9 NB |
167 | /* sysfs reports "K", but we want sectors */ |
168 | sra->component_size *= 2; | |
e86c9dd6 NB |
169 | } |
170 | if (options & GET_CHUNK) { | |
171 | strcpy(base, "chunk_size"); | |
172 | if (load_sys(fname, buf)) | |
173 | goto abort; | |
7e0f6979 | 174 | sra->array.chunk_size = strtoul(buf, NULL, 0); |
e86c9dd6 | 175 | } |
758d3a8e NB |
176 | if (options & GET_CACHE) { |
177 | strcpy(base, "stripe_cache_size"); | |
178 | if (load_sys(fname, buf)) | |
179 | goto abort; | |
180 | sra->cache_size = strtoul(buf, NULL, 0); | |
181 | } | |
37dfc3d6 NB |
182 | if (options & GET_MISMATCH) { |
183 | strcpy(base, "mismatch_cnt"); | |
184 | if (load_sys(fname, buf)) | |
185 | goto abort; | |
186 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
187 | } | |
e86c9dd6 NB |
188 | |
189 | if (! (options & GET_DEVS)) | |
190 | return sra; | |
191 | ||
192 | /* Get all the devices as well */ | |
193 | *base = 0; | |
194 | dir = opendir(fname); | |
195 | if (!dir) | |
196 | goto abort; | |
7e0f6979 | 197 | sra->array.spare_disks = 0; |
e86c9dd6 NB |
198 | |
199 | while ((de = readdir(dir)) != NULL) { | |
200 | char *ep; | |
201 | if (de->d_ino == 0 || | |
202 | strncmp(de->d_name, "dev-", 4) != 0) | |
203 | continue; | |
204 | strcpy(base, de->d_name); | |
205 | dbase = base + strlen(base); | |
206 | *dbase++ = '/'; | |
207 | ||
208 | dev = malloc(sizeof(*dev)); | |
209 | if (!dev) | |
210 | goto abort; | |
211 | dev->next = sra->devs; | |
212 | sra->devs = dev; | |
06c7f68e | 213 | strcpy(dev->sys_name, de->d_name); |
e86c9dd6 NB |
214 | |
215 | /* Always get slot, major, minor */ | |
216 | strcpy(dbase, "slot"); | |
217 | if (load_sys(fname, buf)) | |
218 | goto abort; | |
06c7f68e NB |
219 | dev->disk.raid_disk = strtoul(buf, &ep, 10); |
220 | if (*ep) dev->disk.raid_disk = -1; | |
e86c9dd6 NB |
221 | |
222 | strcpy(dbase, "block/dev"); | |
223 | if (load_sys(fname, buf)) | |
224 | goto abort; | |
06c7f68e | 225 | sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor); |
e86c9dd6 NB |
226 | |
227 | if (options & GET_OFFSET) { | |
228 | strcpy(dbase, "offset"); | |
229 | if (load_sys(fname, buf)) | |
230 | goto abort; | |
06c7f68e | 231 | dev->data_offset = strtoull(buf, NULL, 0); |
e86c9dd6 NB |
232 | } |
233 | if (options & GET_SIZE) { | |
234 | strcpy(dbase, "size"); | |
235 | if (load_sys(fname, buf)) | |
236 | goto abort; | |
047d2e49 | 237 | dev->component_size = strtoull(buf, NULL, 0) * 2; |
e86c9dd6 NB |
238 | } |
239 | if (options & GET_STATE) { | |
06c7f68e | 240 | dev->disk.state = 0; |
e86c9dd6 NB |
241 | strcpy(dbase, "state"); |
242 | if (load_sys(fname, buf)) | |
243 | goto abort; | |
244 | if (strstr(buf, "in_sync")) | |
06c7f68e | 245 | dev->disk.state |= (1<<MD_DISK_SYNC); |
e86c9dd6 | 246 | if (strstr(buf, "faulty")) |
06c7f68e NB |
247 | dev->disk.state |= (1<<MD_DISK_FAULTY); |
248 | if (dev->disk.state == 0) | |
7e0f6979 | 249 | sra->array.spare_disks++; |
e86c9dd6 NB |
250 | } |
251 | if (options & GET_ERROR) { | |
252 | strcpy(buf, "errors"); | |
253 | if (load_sys(fname, buf)) | |
254 | goto abort; | |
255 | dev->errors = strtoul(buf, NULL, 0); | |
256 | } | |
257 | } | |
355726fa | 258 | closedir(dir); |
e86c9dd6 NB |
259 | return sra; |
260 | ||
261 | abort: | |
355726fa NB |
262 | if (dir) |
263 | closedir(dir); | |
8382f19b | 264 | sysfs_free(sra); |
e86c9dd6 NB |
265 | return NULL; |
266 | } | |
267 | ||
268 | unsigned long long get_component_size(int fd) | |
269 | { | |
270 | /* Find out the component size of the array. | |
271 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
272 | * size field is only 32bits. | |
273 | * So look in /sys/block/mdXXX/md/component_size | |
353632d9 | 274 | * |
8686f3ed | 275 | * This returns in units of sectors. |
e86c9dd6 NB |
276 | */ |
277 | struct stat stb; | |
278 | char fname[50]; | |
279 | int n; | |
280 | if (fstat(fd, &stb)) return 0; | |
281 | if (major(stb.st_rdev) == 9) | |
282 | sprintf(fname, "/sys/block/md%d/md/component_size", | |
ea24acd0 | 283 | (int)minor(stb.st_rdev)); |
e86c9dd6 NB |
284 | else |
285 | sprintf(fname, "/sys/block/md_d%d/md/component_size", | |
ea24acd0 | 286 | (int)minor(stb.st_rdev)>>MdpMinorShift); |
e86c9dd6 NB |
287 | fd = open(fname, O_RDONLY); |
288 | if (fd < 0) | |
289 | return 0; | |
290 | n = read(fd, fname, sizeof(fname)); | |
291 | close(fd); | |
292 | if (n == sizeof(fname)) | |
293 | return 0; | |
294 | fname[n] = 0; | |
8686f3ed | 295 | return strtoull(fname, NULL, 10) * 2; |
e86c9dd6 NB |
296 | } |
297 | ||
7e0f6979 | 298 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
299 | char *name, char *val) |
300 | { | |
301 | char fname[50]; | |
302 | int n; | |
303 | int fd; | |
7e1432fb | 304 | |
e86c9dd6 | 305 | sprintf(fname, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 306 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
307 | fd = open(fname, O_WRONLY); |
308 | if (fd < 0) | |
309 | return -1; | |
310 | n = write(fd, val, strlen(val)); | |
311 | close(fd); | |
312 | if (n != strlen(val)) | |
313 | return -1; | |
314 | return 0; | |
315 | } | |
316 | ||
7e0f6979 | 317 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
318 | char *name, unsigned long long val) |
319 | { | |
320 | char valstr[50]; | |
321 | sprintf(valstr, "%llu", val); | |
322 | return sysfs_set_str(sra, dev, name, valstr); | |
323 | } | |
324 | ||
7e0f6979 | 325 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
326 | char *name, unsigned long long *val) |
327 | { | |
328 | char fname[50]; | |
329 | char buf[50]; | |
330 | int n; | |
331 | int fd; | |
332 | char *ep; | |
333 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
7e0f6979 | 334 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
335 | fd = open(fname, O_RDONLY); |
336 | if (fd < 0) | |
337 | return -1; | |
338 | n = read(fd, buf, sizeof(buf)); | |
339 | close(fd); | |
340 | if (n <= 0) | |
341 | return -1; | |
342 | buf[n] = 0; | |
343 | *val = strtoull(buf, &ep, 0); | |
344 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
345 | return -1; | |
346 | return 0; | |
347 | } | |
2503d23b NB |
348 | |
349 | int sysfs_set_array(struct mdinfo *sra, | |
350 | struct mdinfo *info) | |
351 | { | |
352 | int rv = 0; | |
353 | sra->array = info->array; | |
2f6079dc | 354 | |
2503d23b NB |
355 | if (info->array.level < 0) |
356 | return 0; /* FIXME */ | |
357 | rv |= sysfs_set_str(sra, NULL, "level", | |
358 | map_num(pers, info->array.level)); | |
359 | rv |= sysfs_set_num(sra, NULL, "raid_disks", info->array.raid_disks); | |
360 | rv |= sysfs_set_num(sra, NULL, "chunk_size", info->array.chunk_size); | |
361 | rv |= sysfs_set_num(sra, NULL, "layout", info->array.layout); | |
047d2e49 | 362 | rv |= sysfs_set_num(sra, NULL, "component_size", info->component_size/2); |
0fd5c350 | 363 | rv |= sysfs_set_num(sra, NULL, "resync_start", info->resync_start); |
2503d23b NB |
364 | sra->array = info->array; |
365 | return rv; | |
366 | } | |
367 | ||
2318b9f0 | 368 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd) |
2503d23b NB |
369 | { |
370 | char dv[100]; | |
371 | char nm[100]; | |
372 | struct mdinfo *sd2; | |
373 | char *dname; | |
374 | int rv; | |
375 | ||
376 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
377 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
378 | if (rv) | |
379 | return rv; | |
380 | ||
381 | memset(nm, 0, sizeof(nm)); | |
382 | sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor); | |
73649188 N |
383 | rv = readlink(dv, nm, sizeof(nm)); |
384 | if (rv <= 0) | |
2503d23b | 385 | return -1; |
73649188 | 386 | nm[rv] = '\0'; |
2503d23b NB |
387 | dname = strrchr(nm, '/'); |
388 | if (dname) dname++; | |
389 | strcpy(sd->sys_name, "dev-"); | |
390 | strcpy(sd->sys_name+4, dname); | |
391 | ||
73649188 | 392 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); |
2503d23b NB |
393 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); |
394 | if (sra->array.level != LEVEL_CONTAINER) { | |
395 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
396 | // rv |= sysfs_set_str(sra, sd, "state", "in_sync"); | |
397 | } | |
3cb07116 NB |
398 | if (! rv) { |
399 | sd2 = malloc(sizeof(*sd2)); | |
400 | *sd2 = *sd; | |
401 | sd2->next = sra->devs; | |
402 | sra->devs = sd2; | |
403 | } | |
2503d23b NB |
404 | return rv; |
405 | } | |
90c8b707 | 406 | |
755c99fa | 407 | #if 0 |
90c8b707 DW |
408 | int sysfs_disk_to_sg(int fd) |
409 | { | |
410 | /* from an open block device, try find and open its corresponding | |
411 | * scsi_generic interface | |
412 | */ | |
413 | struct stat st; | |
414 | char path[256]; | |
415 | char sg_path[256]; | |
416 | char sg_major_minor[8]; | |
417 | char *c; | |
418 | DIR *dir; | |
419 | struct dirent *de; | |
420 | int major, minor, rv; | |
421 | ||
422 | if (fstat(fd, &st)) | |
423 | return -1; | |
424 | ||
425 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
426 | major(st.st_rdev), minor(st.st_rdev)); | |
427 | ||
428 | dir = opendir(path); | |
429 | if (!dir) | |
430 | return -1; | |
431 | ||
432 | de = readdir(dir); | |
433 | while (de) { | |
434 | if (strncmp("scsi_generic:", de->d_name, | |
435 | strlen("scsi_generic:")) == 0) | |
436 | break; | |
437 | de = readdir(dir); | |
438 | } | |
439 | closedir(dir); | |
440 | ||
441 | if (!de) | |
442 | return -1; | |
443 | ||
444 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
445 | fd = open(sg_path, O_RDONLY); | |
446 | if (fd < 0) | |
447 | return fd; | |
448 | ||
449 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
450 | close(fd); | |
451 | if (rv < 0) | |
452 | return -1; | |
453 | else | |
454 | sg_major_minor[rv - 1] = '\0'; | |
455 | ||
456 | c = strchr(sg_major_minor, ':'); | |
457 | *c = '\0'; | |
458 | c++; | |
459 | major = strtol(sg_major_minor, NULL, 10); | |
460 | minor = strtol(c, NULL, 10); | |
461 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
462 | (int) getpid(), major, minor); | |
463 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
464 | fd = open(path, O_RDONLY); | |
465 | unlink(path); | |
466 | return fd; | |
467 | } | |
468 | ||
469 | return -1; | |
470 | } | |
755c99fa | 471 | #endif |
90c8b707 | 472 | |
f1665f72 DW |
473 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) |
474 | { | |
475 | /* from an open block device, try to retrieve it scsi_id */ | |
476 | struct stat st; | |
477 | char path[256]; | |
478 | char *c1, *c2; | |
479 | DIR *dir; | |
480 | struct dirent *de; | |
481 | ||
482 | if (fstat(fd, &st)) | |
483 | return 1; | |
484 | ||
485 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
486 | major(st.st_rdev), minor(st.st_rdev)); | |
487 | ||
488 | dir = opendir(path); | |
489 | if (!dir) | |
490 | return 1; | |
491 | ||
492 | de = readdir(dir); | |
493 | while (de) { | |
494 | if (strncmp("scsi_disk:", de->d_name, | |
495 | strlen("scsi_disk:")) == 0) | |
496 | break; | |
497 | de = readdir(dir); | |
498 | } | |
499 | closedir(dir); | |
500 | ||
501 | if (!de) | |
502 | return 1; | |
503 | ||
504 | c1 = strchr(de->d_name, ':'); | |
505 | c1++; | |
506 | c2 = strchr(c1, ':'); | |
507 | *c2 = '\0'; | |
508 | *id = strtol(c1, NULL, 10) << 24; /* host */ | |
509 | c1 = c2 + 1; | |
510 | c2 = strchr(c1, ':'); | |
511 | *c2 = '\0'; | |
512 | *id |= strtol(c1, NULL, 10) << 16; /* channel */ | |
513 | c1 = c2 + 1; | |
514 | c2 = strchr(c1, ':'); | |
515 | *c2 = '\0'; | |
516 | *id |= strtol(c1, NULL, 10) << 8; /* lun */ | |
517 | c1 = c2 + 1; | |
518 | *id |= strtol(c1, NULL, 10); /* id */ | |
519 | ||
520 | return 0; | |
521 | } | |
f94d52f4 NB |
522 | |
523 | ||
524 | int sysfs_unique_holder(int devnum, long rdev) | |
525 | { | |
526 | /* Check that devnum is a holder of rdev, | |
527 | * and is the only holder. | |
528 | * we should be locked against races by | |
529 | * an O_EXCL on devnum | |
530 | */ | |
531 | DIR *dir; | |
532 | struct dirent *de; | |
533 | char dirname[100]; | |
534 | char l; | |
535 | int found = 0; | |
536 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", | |
537 | major(rdev), minor(rdev)); | |
538 | dir = opendir(dirname); | |
539 | errno = ENOENT; | |
540 | if (!dir) | |
541 | return 0; | |
542 | l = strlen(dirname); | |
543 | while ((de = readdir(dir)) != NULL) { | |
544 | char buf[10]; | |
545 | int n; | |
546 | int mj, mn; | |
547 | char c; | |
548 | int fd; | |
549 | ||
550 | if (de->d_ino == 0) | |
551 | continue; | |
552 | if (de->d_name[0] == '.') | |
553 | continue; | |
554 | strcpy(dirname+l, "/"); | |
555 | strcat(dirname+l, de->d_name); | |
556 | strcat(dirname+l, "/dev"); | |
557 | fd = open(dirname, O_RDONLY); | |
558 | if (fd < 0) { | |
559 | errno = ENOENT; | |
560 | break; | |
561 | } | |
562 | n = read(fd, buf, sizeof(buf)-1); | |
563 | close(fd); | |
564 | buf[n] = 0; | |
565 | if (sscanf(buf, "%d:%d%c", &mj, &mn, &c) != 3 || | |
566 | c != '\n') { | |
567 | errno = ENOENT; | |
568 | break; | |
569 | } | |
570 | if (mj != MD_MAJOR) | |
571 | mn = -1-(mn>>6); | |
572 | ||
573 | if (devnum != mn) { | |
574 | errno = EEXIST; | |
575 | break; | |
576 | } | |
577 | found = 1; | |
578 | } | |
579 | closedir(dir); | |
580 | if (de) | |
581 | return 0; | |
582 | else | |
583 | return found; | |
584 | } |