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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 | * | |
e736b623 | 5 | * Copyright (C) 2006-2009 Neil Brown <neilb@suse.de> |
e86c9dd6 NB |
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 | 29 | |
bbb52f2b TM |
30 | #define MAX_SYSFS_PATH_LEN 120 |
31 | ||
193b6c0b | 32 | int load_sys(char *path, char *buf, int len) |
e86c9dd6 NB |
33 | { |
34 | int fd = open(path, O_RDONLY); | |
35 | int n; | |
36 | if (fd < 0) | |
37 | return -1; | |
193b6c0b | 38 | n = read(fd, buf, len); |
e86c9dd6 | 39 | close(fd); |
193b6c0b | 40 | if (n <0 || n >= len) |
e86c9dd6 NB |
41 | return -1; |
42 | buf[n] = 0; | |
8dfb8619 | 43 | if (n && buf[n-1] == '\n') |
e86c9dd6 NB |
44 | buf[n-1] = 0; |
45 | return 0; | |
46 | } | |
47 | ||
7e0f6979 | 48 | void sysfs_free(struct mdinfo *sra) |
8382f19b | 49 | { |
7e0f6979 NB |
50 | while (sra) { |
51 | struct mdinfo *sra2 = sra->next; | |
52 | while (sra->devs) { | |
53 | struct mdinfo *d = sra->devs; | |
54 | sra->devs = d->next; | |
bb758cca | 55 | free(d->bb.entries); |
7e0f6979 NB |
56 | free(d); |
57 | } | |
bb758cca | 58 | free(sra->bb.entries); |
7e0f6979 NB |
59 | free(sra); |
60 | sra = sra2; | |
8382f19b | 61 | } |
8382f19b NB |
62 | } |
63 | ||
4dd2df09 | 64 | int sysfs_open(char *devnm, char *devname, char *attr) |
549e9569 | 65 | { |
bbb52f2b | 66 | char fname[MAX_SYSFS_PATH_LEN]; |
549e9569 | 67 | int fd; |
549e9569 | 68 | |
bbb52f2b | 69 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/", devnm); |
549e9569 | 70 | if (devname) { |
bbb52f2b TM |
71 | strncat(fname, devname, MAX_SYSFS_PATH_LEN - strlen(fname)); |
72 | strncat(fname, "/", MAX_SYSFS_PATH_LEN - strlen(fname)); | |
549e9569 | 73 | } |
bbb52f2b | 74 | strncat(fname, attr, MAX_SYSFS_PATH_LEN - strlen(fname)); |
549e9569 | 75 | fd = open(fname, O_RDWR); |
ea6d09b0 | 76 | if (fd < 0 && errno == EACCES) |
549e9569 NB |
77 | fd = open(fname, O_RDONLY); |
78 | return fd; | |
79 | } | |
80 | ||
9465f170 GJ |
81 | void sysfs_init_dev(struct mdinfo *mdi, unsigned long devid) |
82 | { | |
83 | snprintf(mdi->sys_name, | |
84 | sizeof(mdi->sys_name), "dev-%s", devid2kname(devid)); | |
85 | } | |
86 | ||
4dd2df09 | 87 | void sysfs_init(struct mdinfo *mdi, int fd, char *devnm) |
f35f2525 | 88 | { |
678a4a36 | 89 | mdi->sys_name[0] = 0; |
f35f2525 | 90 | if (fd >= 0) { |
f35f2525 | 91 | mdu_version_t vers; |
f35f2525 N |
92 | if (ioctl(fd, RAID_VERSION, &vers) != 0) |
93 | return; | |
4dd2df09 | 94 | devnm = fd2devnm(fd); |
f35f2525 | 95 | } |
4dd2df09 | 96 | if (devnm == NULL) |
d7ab966b | 97 | return; |
4dd2df09 | 98 | strcpy(mdi->sys_name, devnm); |
f35f2525 N |
99 | } |
100 | ||
4dd2df09 | 101 | struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options) |
e86c9dd6 | 102 | { |
33a6535d AW |
103 | char fname[PATH_MAX]; |
104 | char buf[PATH_MAX]; | |
e86c9dd6 NB |
105 | char *base; |
106 | char *dbase; | |
7e0f6979 | 107 | struct mdinfo *sra; |
64e103fe | 108 | struct mdinfo *dev, **devp; |
355726fa | 109 | DIR *dir = NULL; |
e86c9dd6 NB |
110 | struct dirent *de; |
111 | ||
503975b9 | 112 | sra = xcalloc(1, sizeof(*sra)); |
4dd2df09 | 113 | sysfs_init(sra, fd, devnm); |
678a4a36 N |
114 | if (sra->sys_name[0] == 0) { |
115 | free(sra); | |
116 | return NULL; | |
117 | } | |
e86c9dd6 | 118 | |
7e0f6979 | 119 | sprintf(fname, "/sys/block/%s/md/", sra->sys_name); |
e86c9dd6 NB |
120 | base = fname + strlen(fname); |
121 | ||
122 | sra->devs = NULL; | |
8382f19b NB |
123 | if (options & GET_VERSION) { |
124 | strcpy(base, "metadata_version"); | |
193b6c0b | 125 | if (load_sys(fname, buf, sizeof(buf))) |
8382f19b | 126 | goto abort; |
294d6f45 | 127 | if (strncmp(buf, "none", 4) == 0) { |
7e0f6979 NB |
128 | sra->array.major_version = |
129 | sra->array.minor_version = -1; | |
294d6f45 NB |
130 | strcpy(sra->text_version, ""); |
131 | } else if (strncmp(buf, "external:", 9) == 0) { | |
142cb9e1 NB |
132 | sra->array.major_version = -1; |
133 | sra->array.minor_version = -2; | |
134 | strcpy(sra->text_version, buf+9); | |
b8ac1967 | 135 | } else { |
8382f19b | 136 | sscanf(buf, "%d.%d", |
7e0f6979 NB |
137 | &sra->array.major_version, |
138 | &sra->array.minor_version); | |
b8ac1967 NB |
139 | strcpy(sra->text_version, buf); |
140 | } | |
8382f19b | 141 | } |
e86c9dd6 NB |
142 | if (options & GET_LEVEL) { |
143 | strcpy(base, "level"); | |
193b6c0b | 144 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 145 | goto abort; |
7e0f6979 | 146 | sra->array.level = map_name(pers, buf); |
e86c9dd6 NB |
147 | } |
148 | if (options & GET_LAYOUT) { | |
149 | strcpy(base, "layout"); | |
193b6c0b | 150 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 151 | goto abort; |
7e0f6979 | 152 | sra->array.layout = strtoul(buf, NULL, 0); |
e86c9dd6 | 153 | } |
549e9569 NB |
154 | if (options & GET_DISKS) { |
155 | strcpy(base, "raid_disks"); | |
193b6c0b | 156 | if (load_sys(fname, buf, sizeof(buf))) |
549e9569 NB |
157 | goto abort; |
158 | sra->array.raid_disks = strtoul(buf, NULL, 0); | |
f1d26766 DW |
159 | } |
160 | if (options & GET_DEGRADED) { | |
161 | strcpy(base, "degraded"); | |
193b6c0b | 162 | if (load_sys(fname, buf, sizeof(buf))) |
f1d26766 DW |
163 | goto abort; |
164 | sra->array.failed_disks = strtoul(buf, NULL, 0); | |
549e9569 | 165 | } |
e86c9dd6 NB |
166 | if (options & GET_COMPONENT) { |
167 | strcpy(base, "component_size"); | |
193b6c0b | 168 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
169 | goto abort; |
170 | sra->component_size = strtoull(buf, NULL, 0); | |
353632d9 NB |
171 | /* sysfs reports "K", but we want sectors */ |
172 | sra->component_size *= 2; | |
e86c9dd6 NB |
173 | } |
174 | if (options & GET_CHUNK) { | |
175 | strcpy(base, "chunk_size"); | |
193b6c0b | 176 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 177 | goto abort; |
7e0f6979 | 178 | sra->array.chunk_size = strtoul(buf, NULL, 0); |
e86c9dd6 | 179 | } |
758d3a8e NB |
180 | if (options & GET_CACHE) { |
181 | strcpy(base, "stripe_cache_size"); | |
193b6c0b | 182 | if (load_sys(fname, buf, sizeof(buf))) |
6a67848a N |
183 | /* Probably level doesn't support it */ |
184 | sra->cache_size = 0; | |
185 | else | |
186 | sra->cache_size = strtoul(buf, NULL, 0); | |
758d3a8e | 187 | } |
37dfc3d6 NB |
188 | if (options & GET_MISMATCH) { |
189 | strcpy(base, "mismatch_cnt"); | |
193b6c0b | 190 | if (load_sys(fname, buf, sizeof(buf))) |
37dfc3d6 NB |
191 | goto abort; |
192 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
193 | } | |
1770662b DW |
194 | if (options & GET_SAFEMODE) { |
195 | int scale = 1; | |
196 | int dot = 0; | |
f21e18ca | 197 | unsigned i; |
1770662b DW |
198 | unsigned long msec; |
199 | size_t len; | |
200 | ||
201 | strcpy(base, "safe_mode_delay"); | |
193b6c0b | 202 | if (load_sys(fname, buf, sizeof(buf))) |
1770662b DW |
203 | goto abort; |
204 | ||
205 | /* remove a period, and count digits after it */ | |
206 | len = strlen(buf); | |
207 | for (i = 0; i < len; i++) { | |
208 | if (dot) { | |
209 | if (isdigit(buf[i])) { | |
210 | buf[i-1] = buf[i]; | |
211 | scale *= 10; | |
212 | } | |
213 | buf[i] = 0; | |
214 | } else if (buf[i] == '.') { | |
215 | dot=1; | |
216 | buf[i] = 0; | |
217 | } | |
218 | } | |
219 | msec = strtoul(buf, NULL, 10); | |
220 | msec = (msec * 1000) / scale; | |
221 | sra->safe_mode_delay = msec; | |
222 | } | |
c0c1acd6 N |
223 | if (options & GET_BITMAP_LOCATION) { |
224 | strcpy(base, "bitmap/location"); | |
193b6c0b | 225 | if (load_sys(fname, buf, sizeof(buf))) |
c0c1acd6 N |
226 | goto abort; |
227 | if (strncmp(buf, "file", 4) == 0) | |
228 | sra->bitmap_offset = 1; | |
229 | else if (strncmp(buf, "none", 4) == 0) | |
230 | sra->bitmap_offset = 0; | |
231 | else if (buf[0] == '+') | |
fbdef498 | 232 | sra->bitmap_offset = strtol(buf+1, NULL, 10); |
c0c1acd6 N |
233 | else |
234 | goto abort; | |
235 | } | |
e86c9dd6 | 236 | |
5aa644c6 SL |
237 | if (options & GET_ARRAY_STATE) { |
238 | strcpy(base, "array_state"); | |
193b6c0b JS |
239 | if (load_sys(fname, sra->sysfs_array_state, |
240 | sizeof(sra->sysfs_array_state))) | |
5aa644c6 SL |
241 | goto abort; |
242 | } else | |
243 | sra->sysfs_array_state[0] = 0; | |
244 | ||
5308f117 AP |
245 | if (options & GET_CONSISTENCY_POLICY) { |
246 | strcpy(base, "consistency_policy"); | |
247 | if (load_sys(fname, buf, sizeof(buf))) { | |
248 | sra->consistency_policy = CONSISTENCY_POLICY_UNKNOWN; | |
249 | } else { | |
250 | sra->consistency_policy = map_name(consistency_policies, buf); | |
251 | if (sra->consistency_policy == UnSet) | |
252 | sra->consistency_policy = CONSISTENCY_POLICY_UNKNOWN; | |
253 | } | |
254 | } | |
255 | ||
e86c9dd6 NB |
256 | if (! (options & GET_DEVS)) |
257 | return sra; | |
258 | ||
259 | /* Get all the devices as well */ | |
260 | *base = 0; | |
261 | dir = opendir(fname); | |
262 | if (!dir) | |
263 | goto abort; | |
7e0f6979 | 264 | sra->array.spare_disks = 0; |
e86c9dd6 | 265 | |
64e103fe N |
266 | devp = &sra->devs; |
267 | sra->devs = NULL; | |
e86c9dd6 NB |
268 | while ((de = readdir(dir)) != NULL) { |
269 | char *ep; | |
270 | if (de->d_ino == 0 || | |
271 | strncmp(de->d_name, "dev-", 4) != 0) | |
272 | continue; | |
273 | strcpy(base, de->d_name); | |
274 | dbase = base + strlen(base); | |
275 | *dbase++ = '/'; | |
276 | ||
bb758cca | 277 | dev = xcalloc(1, sizeof(*dev)); |
e86c9dd6 NB |
278 | |
279 | /* Always get slot, major, minor */ | |
280 | strcpy(dbase, "slot"); | |
193b6c0b | 281 | if (load_sys(fname, buf, sizeof(buf))) { |
4795982e DW |
282 | /* hmm... unable to read 'slot' maybe the device |
283 | * is going away? | |
284 | */ | |
285 | strcpy(dbase, "block"); | |
286 | if (readlink(fname, buf, sizeof(buf)) < 0 && | |
287 | errno != ENAMETOOLONG) { | |
288 | /* ...yup device is gone */ | |
289 | free(dev); | |
290 | continue; | |
291 | } else { | |
292 | /* slot is unreadable but 'block' link | |
293 | * still intact... something bad is happening | |
294 | * so abort | |
295 | */ | |
296 | free(dev); | |
297 | goto abort; | |
298 | } | |
64e103fe | 299 | |
4795982e | 300 | } |
4795982e | 301 | strcpy(dev->sys_name, de->d_name); |
06c7f68e NB |
302 | dev->disk.raid_disk = strtoul(buf, &ep, 10); |
303 | if (*ep) dev->disk.raid_disk = -1; | |
e86c9dd6 NB |
304 | |
305 | strcpy(dbase, "block/dev"); | |
193b6c0b | 306 | if (load_sys(fname, buf, sizeof(buf))) { |
b526e52d DW |
307 | /* assume this is a stale reference to a hot |
308 | * removed device | |
309 | */ | |
dab4a513 | 310 | free(dev); |
b526e52d | 311 | continue; |
dab4a513 | 312 | } |
e6fc80a8 | 313 | sra->array.nr_disks++; |
06c7f68e | 314 | sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor); |
e86c9dd6 | 315 | |
dab4a513 | 316 | /* special case check for block devices that can go 'offline' */ |
b526e52d | 317 | strcpy(dbase, "block/device/state"); |
193b6c0b | 318 | if (load_sys(fname, buf, sizeof(buf)) == 0 && |
b526e52d DW |
319 | strncmp(buf, "offline", 7) == 0) { |
320 | free(dev); | |
321 | continue; | |
dab4a513 DW |
322 | } |
323 | ||
324 | /* finally add this disk to the array */ | |
64e103fe N |
325 | *devp = dev; |
326 | devp = & dev->next; | |
327 | dev->next = NULL; | |
dab4a513 | 328 | |
e86c9dd6 NB |
329 | if (options & GET_OFFSET) { |
330 | strcpy(dbase, "offset"); | |
193b6c0b | 331 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 332 | goto abort; |
06c7f68e | 333 | dev->data_offset = strtoull(buf, NULL, 0); |
fe384ca0 | 334 | strcpy(dbase, "new_offset"); |
193b6c0b | 335 | if (load_sys(fname, buf, sizeof(buf)) == 0) |
fe384ca0 N |
336 | dev->new_data_offset = strtoull(buf, NULL, 0); |
337 | else | |
338 | dev->new_data_offset = dev->data_offset; | |
e86c9dd6 NB |
339 | } |
340 | if (options & GET_SIZE) { | |
341 | strcpy(dbase, "size"); | |
193b6c0b | 342 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 343 | goto abort; |
047d2e49 | 344 | dev->component_size = strtoull(buf, NULL, 0) * 2; |
e86c9dd6 NB |
345 | } |
346 | if (options & GET_STATE) { | |
06c7f68e | 347 | dev->disk.state = 0; |
e86c9dd6 | 348 | strcpy(dbase, "state"); |
193b6c0b | 349 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
350 | goto abort; |
351 | if (strstr(buf, "in_sync")) | |
06c7f68e | 352 | dev->disk.state |= (1<<MD_DISK_SYNC); |
e86c9dd6 | 353 | if (strstr(buf, "faulty")) |
06c7f68e NB |
354 | dev->disk.state |= (1<<MD_DISK_FAULTY); |
355 | if (dev->disk.state == 0) | |
7e0f6979 | 356 | sra->array.spare_disks++; |
e86c9dd6 NB |
357 | } |
358 | if (options & GET_ERROR) { | |
359 | strcpy(buf, "errors"); | |
193b6c0b | 360 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
361 | goto abort; |
362 | dev->errors = strtoul(buf, NULL, 0); | |
363 | } | |
364 | } | |
355726fa | 365 | closedir(dir); |
e86c9dd6 NB |
366 | return sra; |
367 | ||
368 | abort: | |
355726fa NB |
369 | if (dir) |
370 | closedir(dir); | |
8382f19b | 371 | sysfs_free(sra); |
e86c9dd6 NB |
372 | return NULL; |
373 | } | |
374 | ||
1770662b DW |
375 | int sysfs_attr_match(const char *attr, const char *str) |
376 | { | |
377 | /* See if attr, read from a sysfs file, matches | |
378 | * str. They must either be the same, or attr can | |
379 | * have a trailing newline or comma | |
380 | */ | |
381 | while (*attr && *str && *attr == *str) { | |
382 | attr++; | |
383 | str++; | |
384 | } | |
385 | ||
386 | if (*str || (*attr && *attr != ',' && *attr != '\n')) | |
387 | return 0; | |
388 | return 1; | |
389 | } | |
390 | ||
391 | int sysfs_match_word(const char *word, char **list) | |
392 | { | |
393 | int n; | |
394 | for (n=0; list[n]; n++) | |
395 | if (sysfs_attr_match(word, list[n])) | |
396 | break; | |
397 | return n; | |
398 | } | |
399 | ||
e86c9dd6 NB |
400 | unsigned long long get_component_size(int fd) |
401 | { | |
402 | /* Find out the component size of the array. | |
403 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
404 | * size field is only 32bits. | |
405 | * So look in /sys/block/mdXXX/md/component_size | |
353632d9 | 406 | * |
8686f3ed | 407 | * This returns in units of sectors. |
e86c9dd6 NB |
408 | */ |
409 | struct stat stb; | |
bbb52f2b | 410 | char fname[MAX_SYSFS_PATH_LEN]; |
e86c9dd6 | 411 | int n; |
36138e4e JS |
412 | if (fstat(fd, &stb)) |
413 | return 0; | |
c07566f1 N |
414 | snprintf(fname, MAX_SYSFS_PATH_LEN, |
415 | "/sys/block/%s/md/component_size", stat2devnm(&stb)); | |
e86c9dd6 NB |
416 | fd = open(fname, O_RDONLY); |
417 | if (fd < 0) | |
418 | return 0; | |
419 | n = read(fd, fname, sizeof(fname)); | |
420 | close(fd); | |
99f6e521 | 421 | if (n < 0 || n == sizeof(fname)) |
e86c9dd6 NB |
422 | return 0; |
423 | fname[n] = 0; | |
8686f3ed | 424 | return strtoull(fname, NULL, 10) * 2; |
e86c9dd6 NB |
425 | } |
426 | ||
7e0f6979 | 427 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
428 | char *name, char *val) |
429 | { | |
bbb52f2b | 430 | char fname[MAX_SYSFS_PATH_LEN]; |
f21e18ca | 431 | unsigned int n; |
e86c9dd6 | 432 | int fd; |
7e1432fb | 433 | |
bbb52f2b | 434 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 435 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
436 | fd = open(fname, O_WRONLY); |
437 | if (fd < 0) | |
438 | return -1; | |
439 | n = write(fd, val, strlen(val)); | |
440 | close(fd); | |
2a24d7b6 | 441 | if (n != strlen(val)) { |
1ade5cc1 N |
442 | dprintf("failed to write '%s' to '%s' (%s)\n", |
443 | val, fname, strerror(errno)); | |
e86c9dd6 | 444 | return -1; |
2a24d7b6 | 445 | } |
e86c9dd6 NB |
446 | return 0; |
447 | } | |
448 | ||
7e0f6979 | 449 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
450 | char *name, unsigned long long val) |
451 | { | |
452 | char valstr[50]; | |
453 | sprintf(valstr, "%llu", val); | |
454 | return sysfs_set_str(sra, dev, name, valstr); | |
455 | } | |
456 | ||
012a8641 JS |
457 | int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev, |
458 | char *name, long long val) | |
459 | { | |
460 | char valstr[50]; | |
461 | sprintf(valstr, "%lli", val); | |
462 | return sysfs_set_str(sra, dev, name, valstr); | |
463 | } | |
464 | ||
97590376 N |
465 | int sysfs_uevent(struct mdinfo *sra, char *event) |
466 | { | |
bbb52f2b | 467 | char fname[MAX_SYSFS_PATH_LEN]; |
97590376 N |
468 | int n; |
469 | int fd; | |
470 | ||
bbb52f2b | 471 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/uevent", |
97590376 N |
472 | sra->sys_name); |
473 | fd = open(fname, O_WRONLY); | |
474 | if (fd < 0) | |
475 | return -1; | |
476 | n = write(fd, event, strlen(event)); | |
477 | close(fd); | |
e4c72d1d | 478 | if (n != (int)strlen(event)) { |
1ade5cc1 N |
479 | dprintf("failed to write '%s' to '%s' (%s)\n", |
480 | event, fname, strerror(errno)); | |
e4c72d1d LB |
481 | return -1; |
482 | } | |
97590376 | 483 | return 0; |
1011e834 | 484 | } |
97590376 | 485 | |
bc77ed53 DW |
486 | int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name) |
487 | { | |
bbb52f2b | 488 | char fname[MAX_SYSFS_PATH_LEN]; |
bc77ed53 DW |
489 | struct stat st; |
490 | ||
bbb52f2b | 491 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
bc77ed53 DW |
492 | sra->sys_name, dev?dev->sys_name:"", name); |
493 | ||
494 | return stat(fname, &st) == 0; | |
495 | } | |
496 | ||
a6288483 N |
497 | int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, |
498 | char *name) | |
e86c9dd6 | 499 | { |
bbb52f2b | 500 | char fname[MAX_SYSFS_PATH_LEN]; |
e86c9dd6 | 501 | int fd; |
a6288483 | 502 | |
bbb52f2b | 503 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 504 | sra->sys_name, dev?dev->sys_name:"", name); |
a6288483 | 505 | fd = open(fname, O_RDWR); |
e86c9dd6 | 506 | if (fd < 0) |
a6288483 N |
507 | fd = open(fname, O_RDONLY); |
508 | return fd; | |
509 | } | |
510 | ||
511 | int sysfs_fd_get_ll(int fd, unsigned long long *val) | |
512 | { | |
513 | char buf[50]; | |
514 | int n; | |
515 | char *ep; | |
516 | ||
517 | lseek(fd, 0, 0); | |
e86c9dd6 | 518 | n = read(fd, buf, sizeof(buf)); |
5418499a | 519 | if (n <= 0 || n == sizeof(buf)) |
6560987b | 520 | return -2; |
e86c9dd6 NB |
521 | buf[n] = 0; |
522 | *val = strtoull(buf, &ep, 0); | |
523 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
524 | return -1; | |
525 | return 0; | |
526 | } | |
2503d23b | 527 | |
a6288483 N |
528 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, |
529 | char *name, unsigned long long *val) | |
530 | { | |
531 | int n; | |
532 | int fd; | |
533 | ||
534 | fd = sysfs_get_fd(sra, dev, name); | |
535 | if (fd < 0) | |
536 | return -1; | |
537 | n = sysfs_fd_get_ll(fd, val); | |
538 | close(fd); | |
539 | return n; | |
540 | } | |
541 | ||
2eba8496 N |
542 | int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2) |
543 | { | |
544 | /* two numbers in this sysfs file, either | |
545 | * NNN (NNN) | |
546 | * or | |
547 | * NNN / NNN | |
548 | */ | |
549 | char buf[80]; | |
550 | int n; | |
551 | char *ep, *ep2; | |
552 | ||
553 | lseek(fd, 0, 0); | |
554 | n = read(fd, buf, sizeof(buf)); | |
5418499a | 555 | if (n <= 0 || n == sizeof(buf)) |
2eba8496 N |
556 | return -2; |
557 | buf[n] = 0; | |
558 | *v1 = strtoull(buf, &ep, 0); | |
559 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
560 | return -1; | |
561 | while (*ep == ' ' || *ep == '/' || *ep == '(') | |
562 | ep++; | |
563 | *v2 = strtoull(ep, &ep2, 0); | |
564 | if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) { | |
565 | *v2 = *v1; | |
566 | return 1; | |
567 | } | |
568 | return 2; | |
569 | } | |
570 | ||
571 | int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev, | |
572 | char *name, unsigned long long *v1, unsigned long long *v2) | |
573 | { | |
574 | int n; | |
575 | int fd; | |
576 | ||
577 | fd = sysfs_get_fd(sra, dev, name); | |
578 | if (fd < 0) | |
579 | return -1; | |
580 | n = sysfs_fd_get_two(fd, v1, v2); | |
581 | close(fd); | |
582 | return n; | |
583 | } | |
584 | ||
7236ee7a N |
585 | int sysfs_fd_get_str(int fd, char *val, int size) |
586 | { | |
587 | int n; | |
588 | ||
589 | lseek(fd, 0, 0); | |
590 | n = read(fd, val, size); | |
5418499a | 591 | if (n <= 0 || n == size) |
7236ee7a N |
592 | return -1; |
593 | val[n] = 0; | |
594 | return n; | |
595 | } | |
596 | ||
93ecfa01 N |
597 | int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev, |
598 | char *name, char *val, int size) | |
599 | { | |
93ecfa01 N |
600 | int n; |
601 | int fd; | |
7236ee7a N |
602 | |
603 | fd = sysfs_get_fd(sra, dev, name); | |
93ecfa01 N |
604 | if (fd < 0) |
605 | return -1; | |
7236ee7a | 606 | n = sysfs_fd_get_str(fd, val, size); |
93ecfa01 | 607 | close(fd); |
93ecfa01 N |
608 | return n; |
609 | } | |
610 | ||
8ed3e5e1 DW |
611 | int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms) |
612 | { | |
613 | unsigned long sec; | |
614 | unsigned long msec; | |
615 | char delay[30]; | |
616 | ||
617 | sec = ms / 1000; | |
0dd3ba30 | 618 | msec = ms % 1000; |
8ed3e5e1 | 619 | |
0dd3ba30 DW |
620 | sprintf(delay, "%ld.%03ld\n", sec, msec); |
621 | /* this '\n' ^ needed for kernels older than 2.6.28 */ | |
8ed3e5e1 DW |
622 | return sysfs_set_str(sra, NULL, "safe_mode_delay", delay); |
623 | } | |
624 | ||
f35f2525 | 625 | int sysfs_set_array(struct mdinfo *info, int vers) |
2503d23b NB |
626 | { |
627 | int rv = 0; | |
f35f2525 | 628 | char ver[100]; |
a5062b1c | 629 | int raid_disks = info->array.raid_disks; |
f35f2525 N |
630 | |
631 | ver[0] = 0; | |
632 | if (info->array.major_version == -1 && | |
633 | info->array.minor_version == -2) { | |
ddb12f6c AK |
634 | char buf[1024]; |
635 | ||
f35f2525 N |
636 | strcat(strcpy(ver, "external:"), info->text_version); |
637 | ||
ddb12f6c AK |
638 | /* meta version might already be set if we are setting |
639 | * new geometry for a reshape. In that case we don't | |
640 | * want to over-write the 'readonly' flag that is | |
641 | * stored in the metadata version. So read the current | |
642 | * version first, and preserve the flag | |
643 | */ | |
644 | if (sysfs_get_str(info, NULL, "metadata_version", | |
645 | buf, 1024) > 0) | |
646 | if (strlen(buf) >= 9 && buf[9] == '-') | |
647 | ver[9] = '-'; | |
648 | ||
f35f2525 N |
649 | if ((vers % 100) < 2 || |
650 | sysfs_set_str(info, NULL, "metadata_version", | |
651 | ver) < 0) { | |
7a862a02 | 652 | pr_err("This kernel does not support external metadata.\n"); |
f35f2525 N |
653 | return 1; |
654 | } | |
655 | } | |
2503d23b NB |
656 | if (info->array.level < 0) |
657 | return 0; /* FIXME */ | |
f35f2525 | 658 | rv |= sysfs_set_str(info, NULL, "level", |
2503d23b | 659 | map_num(pers, info->array.level)); |
a5062b1c AK |
660 | if (info->reshape_active && info->delta_disks != UnSet) |
661 | raid_disks -= info->delta_disks; | |
662 | rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks); | |
f35f2525 N |
663 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size); |
664 | rv |= sysfs_set_num(info, NULL, "layout", info->array.layout); | |
665 | rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2); | |
da9b4a62 DW |
666 | if (info->custom_array_size) { |
667 | int rc; | |
668 | ||
669 | rc = sysfs_set_num(info, NULL, "array_size", | |
670 | info->custom_array_size/2); | |
671 | if (rc && errno == ENOENT) { | |
7a862a02 | 672 | pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n"); |
da9b4a62 DW |
673 | rc = 0; |
674 | } | |
675 | rv |= rc; | |
676 | } | |
677 | ||
f35f2525 N |
678 | if (info->array.level > 0) |
679 | rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start); | |
f897078e N |
680 | |
681 | if (info->reshape_active) { | |
682 | rv |= sysfs_set_num(info, NULL, "reshape_position", | |
683 | info->reshape_progress); | |
684 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk); | |
20a40eca N |
685 | rv |= sysfs_set_num(info, NULL, "layout", info->new_layout); |
686 | rv |= sysfs_set_num(info, NULL, "raid_disks", | |
a5062b1c | 687 | info->array.raid_disks); |
20a40eca N |
688 | /* We don't set 'new_level' here. That can only happen |
689 | * once the reshape completes. | |
f897078e N |
690 | */ |
691 | } | |
2503d23b NB |
692 | return rv; |
693 | } | |
694 | ||
2904b26f | 695 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume) |
2503d23b | 696 | { |
33a6535d AW |
697 | char dv[PATH_MAX]; |
698 | char nm[PATH_MAX]; | |
2503d23b NB |
699 | char *dname; |
700 | int rv; | |
bb758cca | 701 | int i; |
2503d23b NB |
702 | |
703 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
704 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
705 | if (rv) | |
706 | return rv; | |
707 | ||
708 | memset(nm, 0, sizeof(nm)); | |
bc17158d | 709 | dname = devid2kname(makedev(sd->disk.major, sd->disk.minor)); |
2503d23b NB |
710 | strcpy(sd->sys_name, "dev-"); |
711 | strcpy(sd->sys_name+4, dname); | |
712 | ||
2904b26f DW |
713 | /* test write to see if 'recovery_start' is available */ |
714 | if (resume && sd->recovery_start < MaxSector && | |
715 | sysfs_set_num(sra, sd, "recovery_start", 0)) { | |
716 | sysfs_set_str(sra, sd, "state", "remove"); | |
717 | return -1; | |
718 | } | |
719 | ||
73649188 | 720 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); |
2503d23b NB |
721 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); |
722 | if (sra->array.level != LEVEL_CONTAINER) { | |
d23534e4 | 723 | if (sd->recovery_start == MaxSector) |
462906cd N |
724 | /* This can correctly fail if array isn't started, |
725 | * yet, so just ignore status for now. | |
726 | */ | |
d23534e4 | 727 | sysfs_set_str(sra, sd, "state", "insync"); |
899aead0 AK |
728 | if (sd->disk.raid_disk >= 0) |
729 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
2904b26f DW |
730 | if (resume) |
731 | sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start); | |
2503d23b | 732 | } |
bb758cca TM |
733 | if (sd->bb.supported) { |
734 | if (sysfs_set_str(sra, sd, "state", "external_bbl")) { | |
735 | /* | |
736 | * backward compatibility - if kernel doesn't support | |
737 | * bad blocks for external metadata, let it continue | |
738 | * as long as there are none known so far | |
739 | */ | |
740 | if (sd->bb.count) { | |
741 | pr_err("The kernel has no support for bad blocks in external metadata\n"); | |
742 | return -1; | |
743 | } | |
744 | } | |
745 | ||
746 | for (i = 0; i < sd->bb.count; i++) { | |
747 | char s[30]; | |
748 | const struct md_bb_entry *entry = &sd->bb.entries[i]; | |
749 | ||
750 | snprintf(s, sizeof(s) - 1, "%llu %d\n", entry->sector, | |
751 | entry->length); | |
752 | rv |= sysfs_set_str(sra, sd, "bad_blocks", s); | |
753 | } | |
754 | } | |
2503d23b NB |
755 | return rv; |
756 | } | |
90c8b707 | 757 | |
755c99fa | 758 | #if 0 |
90c8b707 DW |
759 | int sysfs_disk_to_sg(int fd) |
760 | { | |
761 | /* from an open block device, try find and open its corresponding | |
762 | * scsi_generic interface | |
763 | */ | |
764 | struct stat st; | |
765 | char path[256]; | |
766 | char sg_path[256]; | |
5418499a | 767 | char sg_major_minor[10]; |
90c8b707 DW |
768 | char *c; |
769 | DIR *dir; | |
770 | struct dirent *de; | |
771 | int major, minor, rv; | |
772 | ||
773 | if (fstat(fd, &st)) | |
774 | return -1; | |
775 | ||
776 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
777 | major(st.st_rdev), minor(st.st_rdev)); | |
778 | ||
779 | dir = opendir(path); | |
780 | if (!dir) | |
781 | return -1; | |
782 | ||
783 | de = readdir(dir); | |
784 | while (de) { | |
785 | if (strncmp("scsi_generic:", de->d_name, | |
786 | strlen("scsi_generic:")) == 0) | |
787 | break; | |
788 | de = readdir(dir); | |
789 | } | |
790 | closedir(dir); | |
791 | ||
792 | if (!de) | |
793 | return -1; | |
794 | ||
795 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
796 | fd = open(sg_path, O_RDONLY); | |
797 | if (fd < 0) | |
798 | return fd; | |
799 | ||
800 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
801 | close(fd); | |
5418499a | 802 | if (rv < 0 || rv == sizeof(sg_major_minor)) |
90c8b707 DW |
803 | return -1; |
804 | else | |
805 | sg_major_minor[rv - 1] = '\0'; | |
806 | ||
807 | c = strchr(sg_major_minor, ':'); | |
808 | *c = '\0'; | |
809 | c++; | |
810 | major = strtol(sg_major_minor, NULL, 10); | |
811 | minor = strtol(c, NULL, 10); | |
812 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
813 | (int) getpid(), major, minor); | |
814 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
815 | fd = open(path, O_RDONLY); | |
816 | unlink(path); | |
817 | return fd; | |
818 | } | |
819 | ||
820 | return -1; | |
821 | } | |
755c99fa | 822 | #endif |
90c8b707 | 823 | |
f1665f72 DW |
824 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) |
825 | { | |
826 | /* from an open block device, try to retrieve it scsi_id */ | |
827 | struct stat st; | |
828 | char path[256]; | |
f1665f72 DW |
829 | DIR *dir; |
830 | struct dirent *de; | |
d8924477 | 831 | int host, bus, target, lun; |
f1665f72 DW |
832 | |
833 | if (fstat(fd, &st)) | |
834 | return 1; | |
835 | ||
fa89bdee | 836 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device", |
f1665f72 DW |
837 | major(st.st_rdev), minor(st.st_rdev)); |
838 | ||
839 | dir = opendir(path); | |
840 | if (!dir) | |
841 | return 1; | |
842 | ||
d8924477 DW |
843 | for (de = readdir(dir); de; de = readdir(dir)) { |
844 | int count; | |
845 | ||
846 | if (de->d_type != DT_DIR) | |
847 | continue; | |
848 | ||
849 | count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun); | |
850 | if (count == 4) | |
f1665f72 | 851 | break; |
f1665f72 DW |
852 | } |
853 | closedir(dir); | |
854 | ||
855 | if (!de) | |
856 | return 1; | |
857 | ||
d8924477 | 858 | *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0); |
f1665f72 DW |
859 | return 0; |
860 | } | |
f94d52f4 | 861 | |
4dd2df09 | 862 | int sysfs_unique_holder(char *devnm, long rdev) |
f94d52f4 | 863 | { |
4dd2df09 | 864 | /* Check that devnm is a holder of rdev, |
f94d52f4 NB |
865 | * and is the only holder. |
866 | * we should be locked against races by | |
4dd2df09 | 867 | * an O_EXCL on devnm |
aab15415 N |
868 | * Return values: |
869 | * 0 - not unique, not even a holder | |
870 | * 1 - unique, this is the only holder. | |
871 | * 2/3 - not unique, there is another holder | |
872 | * -1 - error, cannot find the holders | |
f94d52f4 NB |
873 | */ |
874 | DIR *dir; | |
875 | struct dirent *de; | |
876 | char dirname[100]; | |
877 | char l; | |
aab15415 | 878 | int ret = 0; |
f94d52f4 NB |
879 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", |
880 | major(rdev), minor(rdev)); | |
881 | dir = opendir(dirname); | |
f94d52f4 | 882 | if (!dir) |
aab15415 | 883 | return -1; |
f94d52f4 NB |
884 | l = strlen(dirname); |
885 | while ((de = readdir(dir)) != NULL) { | |
4dd2df09 N |
886 | char buf[100]; |
887 | char *sl; | |
f94d52f4 | 888 | int n; |
f94d52f4 NB |
889 | |
890 | if (de->d_ino == 0) | |
891 | continue; | |
892 | if (de->d_name[0] == '.') | |
893 | continue; | |
894 | strcpy(dirname+l, "/"); | |
895 | strcat(dirname+l, de->d_name); | |
4dd2df09 N |
896 | n = readlink(dirname, buf, sizeof(buf)-1); |
897 | if (n <= 0) | |
93f1df33 | 898 | continue; |
f94d52f4 | 899 | buf[n] = 0; |
4dd2df09 N |
900 | sl = strrchr(buf, '/'); |
901 | if (!sl) | |
aab15415 | 902 | continue; |
4dd2df09 | 903 | sl++; |
f94d52f4 | 904 | |
4dd2df09 | 905 | if (strcmp(devnm, sl) == 0) |
aab15415 N |
906 | ret |= 1; |
907 | else | |
908 | ret |= 2; | |
f94d52f4 NB |
909 | } |
910 | closedir(dir); | |
aab15415 | 911 | return ret; |
f94d52f4 | 912 | } |
38a07ed6 | 913 | |
bc77ed53 DW |
914 | int sysfs_freeze_array(struct mdinfo *sra) |
915 | { | |
916 | /* Try to freeze resync/rebuild on this array/container. | |
917 | * Return -1 if the array is busy, | |
bc77ed53 DW |
918 | * return 0 if this kernel doesn't support 'frozen' |
919 | * return 1 if it worked. | |
920 | */ | |
921 | char buf[20]; | |
922 | ||
923 | if (!sysfs_attribute_available(sra, NULL, "sync_action")) | |
924 | return 1; /* no sync_action == frozen */ | |
925 | if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) | |
926 | return 0; | |
fd324b08 N |
927 | if (strcmp(buf, "frozen\n") == 0) |
928 | /* Already frozen */ | |
929 | return 0; | |
dea3786a | 930 | if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0) |
bc77ed53 DW |
931 | return -1; |
932 | if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0) | |
933 | return 0; | |
934 | return 1; | |
935 | } | |
efc67e8e N |
936 | |
937 | int sysfs_wait(int fd, int *msec) | |
938 | { | |
939 | /* Wait up to '*msec' for fd to have an exception condition. | |
940 | * if msec == NULL, wait indefinitely. | |
941 | */ | |
942 | fd_set fds; | |
943 | int n; | |
944 | FD_ZERO(&fds); | |
945 | FD_SET(fd, &fds); | |
946 | if (msec == NULL) | |
947 | n = select(fd+1, NULL, NULL, &fds, NULL); | |
948 | else if (*msec < 0) | |
949 | n = 0; | |
950 | else { | |
951 | struct timeval start, end, tv; | |
952 | gettimeofday(&start, NULL); | |
4bffc964 N |
953 | if (*msec < 1000) { |
954 | tv.tv_sec = 0; | |
efc67e8e | 955 | tv.tv_usec = (*msec)*1000; |
4bffc964 | 956 | } else { |
efc67e8e | 957 | tv.tv_sec = (*msec)/1000; |
4bffc964 N |
958 | tv.tv_usec = 0; |
959 | } | |
efc67e8e N |
960 | n = select(fd+1, NULL, NULL, &fds, &tv); |
961 | gettimeofday(&end, NULL); | |
962 | end.tv_sec -= start.tv_sec; | |
963 | *msec -= (end.tv_sec * 1000 + end.tv_usec/1000 | |
4bffc964 | 964 | - start.tv_usec/1000) + 1; |
efc67e8e N |
965 | } |
966 | return n; | |
967 | } |