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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 | { |
67a02d52 JS |
89 | struct stat stb; |
90 | char fname[MAX_SYSFS_PATH_LEN]; | |
91 | ||
678a4a36 | 92 | mdi->sys_name[0] = 0; |
67a02d52 | 93 | if (fd >= 0) |
4dd2df09 | 94 | devnm = fd2devnm(fd); |
67a02d52 | 95 | |
4dd2df09 | 96 | if (devnm == NULL) |
d7ab966b | 97 | return; |
67a02d52 JS |
98 | |
99 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md", devnm); | |
100 | ||
101 | if (stat(fname, &stb)) | |
102 | return; | |
103 | if (!S_ISDIR(stb.st_mode)) | |
104 | return; | |
4dd2df09 | 105 | strcpy(mdi->sys_name, devnm); |
f35f2525 N |
106 | } |
107 | ||
4dd2df09 | 108 | struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options) |
e86c9dd6 | 109 | { |
33a6535d AW |
110 | char fname[PATH_MAX]; |
111 | char buf[PATH_MAX]; | |
e86c9dd6 NB |
112 | char *base; |
113 | char *dbase; | |
7e0f6979 | 114 | struct mdinfo *sra; |
64e103fe | 115 | struct mdinfo *dev, **devp; |
355726fa | 116 | DIR *dir = NULL; |
e86c9dd6 NB |
117 | struct dirent *de; |
118 | ||
503975b9 | 119 | sra = xcalloc(1, sizeof(*sra)); |
4dd2df09 | 120 | sysfs_init(sra, fd, devnm); |
678a4a36 N |
121 | if (sra->sys_name[0] == 0) { |
122 | free(sra); | |
123 | return NULL; | |
124 | } | |
e86c9dd6 | 125 | |
7e0f6979 | 126 | sprintf(fname, "/sys/block/%s/md/", sra->sys_name); |
e86c9dd6 NB |
127 | base = fname + strlen(fname); |
128 | ||
129 | sra->devs = NULL; | |
8382f19b NB |
130 | if (options & GET_VERSION) { |
131 | strcpy(base, "metadata_version"); | |
193b6c0b | 132 | if (load_sys(fname, buf, sizeof(buf))) |
8382f19b | 133 | goto abort; |
294d6f45 | 134 | if (strncmp(buf, "none", 4) == 0) { |
7e0f6979 NB |
135 | sra->array.major_version = |
136 | sra->array.minor_version = -1; | |
294d6f45 NB |
137 | strcpy(sra->text_version, ""); |
138 | } else if (strncmp(buf, "external:", 9) == 0) { | |
142cb9e1 NB |
139 | sra->array.major_version = -1; |
140 | sra->array.minor_version = -2; | |
141 | strcpy(sra->text_version, buf+9); | |
b8ac1967 | 142 | } else { |
8382f19b | 143 | sscanf(buf, "%d.%d", |
7e0f6979 NB |
144 | &sra->array.major_version, |
145 | &sra->array.minor_version); | |
b8ac1967 NB |
146 | strcpy(sra->text_version, buf); |
147 | } | |
8382f19b | 148 | } |
e86c9dd6 NB |
149 | if (options & GET_LEVEL) { |
150 | strcpy(base, "level"); | |
193b6c0b | 151 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 152 | goto abort; |
7e0f6979 | 153 | sra->array.level = map_name(pers, buf); |
e86c9dd6 NB |
154 | } |
155 | if (options & GET_LAYOUT) { | |
156 | strcpy(base, "layout"); | |
193b6c0b | 157 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 158 | goto abort; |
7e0f6979 | 159 | sra->array.layout = strtoul(buf, NULL, 0); |
e86c9dd6 | 160 | } |
549e9569 NB |
161 | if (options & GET_DISKS) { |
162 | strcpy(base, "raid_disks"); | |
193b6c0b | 163 | if (load_sys(fname, buf, sizeof(buf))) |
549e9569 NB |
164 | goto abort; |
165 | sra->array.raid_disks = strtoul(buf, NULL, 0); | |
f1d26766 DW |
166 | } |
167 | if (options & GET_DEGRADED) { | |
168 | strcpy(base, "degraded"); | |
193b6c0b | 169 | if (load_sys(fname, buf, sizeof(buf))) |
f1d26766 DW |
170 | goto abort; |
171 | sra->array.failed_disks = strtoul(buf, NULL, 0); | |
549e9569 | 172 | } |
e86c9dd6 NB |
173 | if (options & GET_COMPONENT) { |
174 | strcpy(base, "component_size"); | |
193b6c0b | 175 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
176 | goto abort; |
177 | sra->component_size = strtoull(buf, NULL, 0); | |
353632d9 NB |
178 | /* sysfs reports "K", but we want sectors */ |
179 | sra->component_size *= 2; | |
e86c9dd6 NB |
180 | } |
181 | if (options & GET_CHUNK) { | |
182 | strcpy(base, "chunk_size"); | |
193b6c0b | 183 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 184 | goto abort; |
7e0f6979 | 185 | sra->array.chunk_size = strtoul(buf, NULL, 0); |
e86c9dd6 | 186 | } |
758d3a8e NB |
187 | if (options & GET_CACHE) { |
188 | strcpy(base, "stripe_cache_size"); | |
193b6c0b | 189 | if (load_sys(fname, buf, sizeof(buf))) |
6a67848a N |
190 | /* Probably level doesn't support it */ |
191 | sra->cache_size = 0; | |
192 | else | |
193 | sra->cache_size = strtoul(buf, NULL, 0); | |
758d3a8e | 194 | } |
37dfc3d6 NB |
195 | if (options & GET_MISMATCH) { |
196 | strcpy(base, "mismatch_cnt"); | |
193b6c0b | 197 | if (load_sys(fname, buf, sizeof(buf))) |
37dfc3d6 NB |
198 | goto abort; |
199 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
200 | } | |
1770662b DW |
201 | if (options & GET_SAFEMODE) { |
202 | int scale = 1; | |
203 | int dot = 0; | |
f21e18ca | 204 | unsigned i; |
1770662b DW |
205 | unsigned long msec; |
206 | size_t len; | |
207 | ||
208 | strcpy(base, "safe_mode_delay"); | |
193b6c0b | 209 | if (load_sys(fname, buf, sizeof(buf))) |
1770662b DW |
210 | goto abort; |
211 | ||
212 | /* remove a period, and count digits after it */ | |
213 | len = strlen(buf); | |
214 | for (i = 0; i < len; i++) { | |
215 | if (dot) { | |
216 | if (isdigit(buf[i])) { | |
217 | buf[i-1] = buf[i]; | |
218 | scale *= 10; | |
219 | } | |
220 | buf[i] = 0; | |
221 | } else if (buf[i] == '.') { | |
222 | dot=1; | |
223 | buf[i] = 0; | |
224 | } | |
225 | } | |
226 | msec = strtoul(buf, NULL, 10); | |
227 | msec = (msec * 1000) / scale; | |
228 | sra->safe_mode_delay = msec; | |
229 | } | |
c0c1acd6 N |
230 | if (options & GET_BITMAP_LOCATION) { |
231 | strcpy(base, "bitmap/location"); | |
193b6c0b | 232 | if (load_sys(fname, buf, sizeof(buf))) |
c0c1acd6 N |
233 | goto abort; |
234 | if (strncmp(buf, "file", 4) == 0) | |
235 | sra->bitmap_offset = 1; | |
236 | else if (strncmp(buf, "none", 4) == 0) | |
237 | sra->bitmap_offset = 0; | |
238 | else if (buf[0] == '+') | |
fbdef498 | 239 | sra->bitmap_offset = strtol(buf+1, NULL, 10); |
c0c1acd6 N |
240 | else |
241 | goto abort; | |
242 | } | |
e86c9dd6 | 243 | |
5aa644c6 SL |
244 | if (options & GET_ARRAY_STATE) { |
245 | strcpy(base, "array_state"); | |
193b6c0b JS |
246 | if (load_sys(fname, sra->sysfs_array_state, |
247 | sizeof(sra->sysfs_array_state))) | |
5aa644c6 SL |
248 | goto abort; |
249 | } else | |
250 | sra->sysfs_array_state[0] = 0; | |
251 | ||
5308f117 AP |
252 | if (options & GET_CONSISTENCY_POLICY) { |
253 | strcpy(base, "consistency_policy"); | |
254 | if (load_sys(fname, buf, sizeof(buf))) { | |
255 | sra->consistency_policy = CONSISTENCY_POLICY_UNKNOWN; | |
256 | } else { | |
257 | sra->consistency_policy = map_name(consistency_policies, buf); | |
258 | if (sra->consistency_policy == UnSet) | |
259 | sra->consistency_policy = CONSISTENCY_POLICY_UNKNOWN; | |
260 | } | |
261 | } | |
262 | ||
e86c9dd6 NB |
263 | if (! (options & GET_DEVS)) |
264 | return sra; | |
265 | ||
266 | /* Get all the devices as well */ | |
267 | *base = 0; | |
268 | dir = opendir(fname); | |
269 | if (!dir) | |
270 | goto abort; | |
7e0f6979 | 271 | sra->array.spare_disks = 0; |
e86c9dd6 | 272 | |
64e103fe N |
273 | devp = &sra->devs; |
274 | sra->devs = NULL; | |
e86c9dd6 NB |
275 | while ((de = readdir(dir)) != NULL) { |
276 | char *ep; | |
277 | if (de->d_ino == 0 || | |
278 | strncmp(de->d_name, "dev-", 4) != 0) | |
279 | continue; | |
280 | strcpy(base, de->d_name); | |
281 | dbase = base + strlen(base); | |
282 | *dbase++ = '/'; | |
283 | ||
bb758cca | 284 | dev = xcalloc(1, sizeof(*dev)); |
e86c9dd6 NB |
285 | |
286 | /* Always get slot, major, minor */ | |
287 | strcpy(dbase, "slot"); | |
193b6c0b | 288 | if (load_sys(fname, buf, sizeof(buf))) { |
4795982e DW |
289 | /* hmm... unable to read 'slot' maybe the device |
290 | * is going away? | |
291 | */ | |
292 | strcpy(dbase, "block"); | |
293 | if (readlink(fname, buf, sizeof(buf)) < 0 && | |
294 | errno != ENAMETOOLONG) { | |
295 | /* ...yup device is gone */ | |
296 | free(dev); | |
297 | continue; | |
298 | } else { | |
299 | /* slot is unreadable but 'block' link | |
300 | * still intact... something bad is happening | |
301 | * so abort | |
302 | */ | |
303 | free(dev); | |
304 | goto abort; | |
305 | } | |
64e103fe | 306 | |
4795982e | 307 | } |
4795982e | 308 | strcpy(dev->sys_name, de->d_name); |
06c7f68e NB |
309 | dev->disk.raid_disk = strtoul(buf, &ep, 10); |
310 | if (*ep) dev->disk.raid_disk = -1; | |
e86c9dd6 NB |
311 | |
312 | strcpy(dbase, "block/dev"); | |
193b6c0b | 313 | if (load_sys(fname, buf, sizeof(buf))) { |
b526e52d DW |
314 | /* assume this is a stale reference to a hot |
315 | * removed device | |
316 | */ | |
dab4a513 | 317 | free(dev); |
b526e52d | 318 | continue; |
dab4a513 | 319 | } |
e6fc80a8 | 320 | sra->array.nr_disks++; |
06c7f68e | 321 | sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor); |
e86c9dd6 | 322 | |
dab4a513 | 323 | /* special case check for block devices that can go 'offline' */ |
b526e52d | 324 | strcpy(dbase, "block/device/state"); |
193b6c0b | 325 | if (load_sys(fname, buf, sizeof(buf)) == 0 && |
b526e52d DW |
326 | strncmp(buf, "offline", 7) == 0) { |
327 | free(dev); | |
328 | continue; | |
dab4a513 DW |
329 | } |
330 | ||
331 | /* finally add this disk to the array */ | |
64e103fe N |
332 | *devp = dev; |
333 | devp = & dev->next; | |
334 | dev->next = NULL; | |
dab4a513 | 335 | |
e86c9dd6 NB |
336 | if (options & GET_OFFSET) { |
337 | strcpy(dbase, "offset"); | |
193b6c0b | 338 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 339 | goto abort; |
06c7f68e | 340 | dev->data_offset = strtoull(buf, NULL, 0); |
fe384ca0 | 341 | strcpy(dbase, "new_offset"); |
193b6c0b | 342 | if (load_sys(fname, buf, sizeof(buf)) == 0) |
fe384ca0 N |
343 | dev->new_data_offset = strtoull(buf, NULL, 0); |
344 | else | |
345 | dev->new_data_offset = dev->data_offset; | |
e86c9dd6 NB |
346 | } |
347 | if (options & GET_SIZE) { | |
348 | strcpy(dbase, "size"); | |
193b6c0b | 349 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 350 | goto abort; |
047d2e49 | 351 | dev->component_size = strtoull(buf, NULL, 0) * 2; |
e86c9dd6 NB |
352 | } |
353 | if (options & GET_STATE) { | |
06c7f68e | 354 | dev->disk.state = 0; |
e86c9dd6 | 355 | strcpy(dbase, "state"); |
193b6c0b | 356 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
357 | goto abort; |
358 | if (strstr(buf, "in_sync")) | |
06c7f68e | 359 | dev->disk.state |= (1<<MD_DISK_SYNC); |
e86c9dd6 | 360 | if (strstr(buf, "faulty")) |
06c7f68e NB |
361 | dev->disk.state |= (1<<MD_DISK_FAULTY); |
362 | if (dev->disk.state == 0) | |
7e0f6979 | 363 | sra->array.spare_disks++; |
e86c9dd6 NB |
364 | } |
365 | if (options & GET_ERROR) { | |
366 | strcpy(buf, "errors"); | |
193b6c0b | 367 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
368 | goto abort; |
369 | dev->errors = strtoul(buf, NULL, 0); | |
370 | } | |
371 | } | |
355726fa | 372 | closedir(dir); |
e86c9dd6 NB |
373 | return sra; |
374 | ||
375 | abort: | |
355726fa NB |
376 | if (dir) |
377 | closedir(dir); | |
8382f19b | 378 | sysfs_free(sra); |
e86c9dd6 NB |
379 | return NULL; |
380 | } | |
381 | ||
1770662b DW |
382 | int sysfs_attr_match(const char *attr, const char *str) |
383 | { | |
384 | /* See if attr, read from a sysfs file, matches | |
385 | * str. They must either be the same, or attr can | |
386 | * have a trailing newline or comma | |
387 | */ | |
388 | while (*attr && *str && *attr == *str) { | |
389 | attr++; | |
390 | str++; | |
391 | } | |
392 | ||
393 | if (*str || (*attr && *attr != ',' && *attr != '\n')) | |
394 | return 0; | |
395 | return 1; | |
396 | } | |
397 | ||
398 | int sysfs_match_word(const char *word, char **list) | |
399 | { | |
400 | int n; | |
401 | for (n=0; list[n]; n++) | |
402 | if (sysfs_attr_match(word, list[n])) | |
403 | break; | |
404 | return n; | |
405 | } | |
406 | ||
e86c9dd6 NB |
407 | unsigned long long get_component_size(int fd) |
408 | { | |
409 | /* Find out the component size of the array. | |
410 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
411 | * size field is only 32bits. | |
412 | * So look in /sys/block/mdXXX/md/component_size | |
353632d9 | 413 | * |
8686f3ed | 414 | * This returns in units of sectors. |
e86c9dd6 NB |
415 | */ |
416 | struct stat stb; | |
bbb52f2b | 417 | char fname[MAX_SYSFS_PATH_LEN]; |
e86c9dd6 | 418 | int n; |
36138e4e JS |
419 | if (fstat(fd, &stb)) |
420 | return 0; | |
c07566f1 N |
421 | snprintf(fname, MAX_SYSFS_PATH_LEN, |
422 | "/sys/block/%s/md/component_size", stat2devnm(&stb)); | |
e86c9dd6 NB |
423 | fd = open(fname, O_RDONLY); |
424 | if (fd < 0) | |
425 | return 0; | |
426 | n = read(fd, fname, sizeof(fname)); | |
427 | close(fd); | |
99f6e521 | 428 | if (n < 0 || n == sizeof(fname)) |
e86c9dd6 NB |
429 | return 0; |
430 | fname[n] = 0; | |
8686f3ed | 431 | return strtoull(fname, NULL, 10) * 2; |
e86c9dd6 NB |
432 | } |
433 | ||
7e0f6979 | 434 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
435 | char *name, char *val) |
436 | { | |
bbb52f2b | 437 | char fname[MAX_SYSFS_PATH_LEN]; |
f21e18ca | 438 | unsigned int n; |
e86c9dd6 | 439 | int fd; |
7e1432fb | 440 | |
bbb52f2b | 441 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 442 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
443 | fd = open(fname, O_WRONLY); |
444 | if (fd < 0) | |
445 | return -1; | |
446 | n = write(fd, val, strlen(val)); | |
447 | close(fd); | |
2a24d7b6 | 448 | if (n != strlen(val)) { |
1ade5cc1 N |
449 | dprintf("failed to write '%s' to '%s' (%s)\n", |
450 | val, fname, strerror(errno)); | |
e86c9dd6 | 451 | return -1; |
2a24d7b6 | 452 | } |
e86c9dd6 NB |
453 | return 0; |
454 | } | |
455 | ||
7e0f6979 | 456 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
457 | char *name, unsigned long long val) |
458 | { | |
459 | char valstr[50]; | |
460 | sprintf(valstr, "%llu", val); | |
461 | return sysfs_set_str(sra, dev, name, valstr); | |
462 | } | |
463 | ||
012a8641 JS |
464 | int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev, |
465 | char *name, long long val) | |
466 | { | |
467 | char valstr[50]; | |
468 | sprintf(valstr, "%lli", val); | |
469 | return sysfs_set_str(sra, dev, name, valstr); | |
470 | } | |
471 | ||
97590376 N |
472 | int sysfs_uevent(struct mdinfo *sra, char *event) |
473 | { | |
bbb52f2b | 474 | char fname[MAX_SYSFS_PATH_LEN]; |
97590376 N |
475 | int n; |
476 | int fd; | |
477 | ||
bbb52f2b | 478 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/uevent", |
97590376 N |
479 | sra->sys_name); |
480 | fd = open(fname, O_WRONLY); | |
481 | if (fd < 0) | |
482 | return -1; | |
483 | n = write(fd, event, strlen(event)); | |
484 | close(fd); | |
e4c72d1d | 485 | if (n != (int)strlen(event)) { |
1ade5cc1 N |
486 | dprintf("failed to write '%s' to '%s' (%s)\n", |
487 | event, fname, strerror(errno)); | |
e4c72d1d LB |
488 | return -1; |
489 | } | |
97590376 | 490 | return 0; |
1011e834 | 491 | } |
97590376 | 492 | |
bc77ed53 DW |
493 | int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name) |
494 | { | |
bbb52f2b | 495 | char fname[MAX_SYSFS_PATH_LEN]; |
bc77ed53 DW |
496 | struct stat st; |
497 | ||
bbb52f2b | 498 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
bc77ed53 DW |
499 | sra->sys_name, dev?dev->sys_name:"", name); |
500 | ||
501 | return stat(fname, &st) == 0; | |
502 | } | |
503 | ||
a6288483 N |
504 | int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, |
505 | char *name) | |
e86c9dd6 | 506 | { |
bbb52f2b | 507 | char fname[MAX_SYSFS_PATH_LEN]; |
e86c9dd6 | 508 | int fd; |
a6288483 | 509 | |
bbb52f2b | 510 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 511 | sra->sys_name, dev?dev->sys_name:"", name); |
a6288483 | 512 | fd = open(fname, O_RDWR); |
e86c9dd6 | 513 | if (fd < 0) |
a6288483 N |
514 | fd = open(fname, O_RDONLY); |
515 | return fd; | |
516 | } | |
517 | ||
518 | int sysfs_fd_get_ll(int fd, unsigned long long *val) | |
519 | { | |
520 | char buf[50]; | |
521 | int n; | |
522 | char *ep; | |
523 | ||
524 | lseek(fd, 0, 0); | |
e86c9dd6 | 525 | n = read(fd, buf, sizeof(buf)); |
5418499a | 526 | if (n <= 0 || n == sizeof(buf)) |
6560987b | 527 | return -2; |
e86c9dd6 NB |
528 | buf[n] = 0; |
529 | *val = strtoull(buf, &ep, 0); | |
530 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
531 | return -1; | |
532 | return 0; | |
533 | } | |
2503d23b | 534 | |
a6288483 N |
535 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, |
536 | char *name, unsigned long long *val) | |
537 | { | |
538 | int n; | |
539 | int fd; | |
540 | ||
541 | fd = sysfs_get_fd(sra, dev, name); | |
542 | if (fd < 0) | |
543 | return -1; | |
544 | n = sysfs_fd_get_ll(fd, val); | |
545 | close(fd); | |
546 | return n; | |
547 | } | |
548 | ||
2eba8496 N |
549 | int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2) |
550 | { | |
551 | /* two numbers in this sysfs file, either | |
552 | * NNN (NNN) | |
553 | * or | |
554 | * NNN / NNN | |
555 | */ | |
556 | char buf[80]; | |
557 | int n; | |
558 | char *ep, *ep2; | |
559 | ||
560 | lseek(fd, 0, 0); | |
561 | n = read(fd, buf, sizeof(buf)); | |
5418499a | 562 | if (n <= 0 || n == sizeof(buf)) |
2eba8496 N |
563 | return -2; |
564 | buf[n] = 0; | |
565 | *v1 = strtoull(buf, &ep, 0); | |
566 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
567 | return -1; | |
568 | while (*ep == ' ' || *ep == '/' || *ep == '(') | |
569 | ep++; | |
570 | *v2 = strtoull(ep, &ep2, 0); | |
571 | if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) { | |
572 | *v2 = *v1; | |
573 | return 1; | |
574 | } | |
575 | return 2; | |
576 | } | |
577 | ||
578 | int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev, | |
579 | char *name, unsigned long long *v1, unsigned long long *v2) | |
580 | { | |
581 | int n; | |
582 | int fd; | |
583 | ||
584 | fd = sysfs_get_fd(sra, dev, name); | |
585 | if (fd < 0) | |
586 | return -1; | |
587 | n = sysfs_fd_get_two(fd, v1, v2); | |
588 | close(fd); | |
589 | return n; | |
590 | } | |
591 | ||
7236ee7a N |
592 | int sysfs_fd_get_str(int fd, char *val, int size) |
593 | { | |
594 | int n; | |
595 | ||
596 | lseek(fd, 0, 0); | |
597 | n = read(fd, val, size); | |
5418499a | 598 | if (n <= 0 || n == size) |
7236ee7a N |
599 | return -1; |
600 | val[n] = 0; | |
601 | return n; | |
602 | } | |
603 | ||
93ecfa01 N |
604 | int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev, |
605 | char *name, char *val, int size) | |
606 | { | |
93ecfa01 N |
607 | int n; |
608 | int fd; | |
7236ee7a N |
609 | |
610 | fd = sysfs_get_fd(sra, dev, name); | |
93ecfa01 N |
611 | if (fd < 0) |
612 | return -1; | |
7236ee7a | 613 | n = sysfs_fd_get_str(fd, val, size); |
93ecfa01 | 614 | close(fd); |
93ecfa01 N |
615 | return n; |
616 | } | |
617 | ||
8ed3e5e1 DW |
618 | int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms) |
619 | { | |
620 | unsigned long sec; | |
621 | unsigned long msec; | |
622 | char delay[30]; | |
623 | ||
624 | sec = ms / 1000; | |
0dd3ba30 | 625 | msec = ms % 1000; |
8ed3e5e1 | 626 | |
0dd3ba30 DW |
627 | sprintf(delay, "%ld.%03ld\n", sec, msec); |
628 | /* this '\n' ^ needed for kernels older than 2.6.28 */ | |
8ed3e5e1 DW |
629 | return sysfs_set_str(sra, NULL, "safe_mode_delay", delay); |
630 | } | |
631 | ||
f35f2525 | 632 | int sysfs_set_array(struct mdinfo *info, int vers) |
2503d23b NB |
633 | { |
634 | int rv = 0; | |
f35f2525 | 635 | char ver[100]; |
a5062b1c | 636 | int raid_disks = info->array.raid_disks; |
f35f2525 N |
637 | |
638 | ver[0] = 0; | |
639 | if (info->array.major_version == -1 && | |
640 | info->array.minor_version == -2) { | |
ddb12f6c AK |
641 | char buf[1024]; |
642 | ||
f35f2525 N |
643 | strcat(strcpy(ver, "external:"), info->text_version); |
644 | ||
ddb12f6c AK |
645 | /* meta version might already be set if we are setting |
646 | * new geometry for a reshape. In that case we don't | |
647 | * want to over-write the 'readonly' flag that is | |
648 | * stored in the metadata version. So read the current | |
649 | * version first, and preserve the flag | |
650 | */ | |
651 | if (sysfs_get_str(info, NULL, "metadata_version", | |
652 | buf, 1024) > 0) | |
653 | if (strlen(buf) >= 9 && buf[9] == '-') | |
654 | ver[9] = '-'; | |
655 | ||
f35f2525 N |
656 | if ((vers % 100) < 2 || |
657 | sysfs_set_str(info, NULL, "metadata_version", | |
658 | ver) < 0) { | |
7a862a02 | 659 | pr_err("This kernel does not support external metadata.\n"); |
f35f2525 N |
660 | return 1; |
661 | } | |
662 | } | |
2503d23b NB |
663 | if (info->array.level < 0) |
664 | return 0; /* FIXME */ | |
f35f2525 | 665 | rv |= sysfs_set_str(info, NULL, "level", |
2503d23b | 666 | map_num(pers, info->array.level)); |
a5062b1c AK |
667 | if (info->reshape_active && info->delta_disks != UnSet) |
668 | raid_disks -= info->delta_disks; | |
669 | rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks); | |
f35f2525 N |
670 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size); |
671 | rv |= sysfs_set_num(info, NULL, "layout", info->array.layout); | |
672 | rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2); | |
da9b4a62 DW |
673 | if (info->custom_array_size) { |
674 | int rc; | |
675 | ||
676 | rc = sysfs_set_num(info, NULL, "array_size", | |
677 | info->custom_array_size/2); | |
678 | if (rc && errno == ENOENT) { | |
7a862a02 | 679 | pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n"); |
da9b4a62 DW |
680 | rc = 0; |
681 | } | |
682 | rv |= rc; | |
683 | } | |
684 | ||
f35f2525 N |
685 | if (info->array.level > 0) |
686 | rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start); | |
f897078e N |
687 | |
688 | if (info->reshape_active) { | |
689 | rv |= sysfs_set_num(info, NULL, "reshape_position", | |
690 | info->reshape_progress); | |
691 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk); | |
20a40eca N |
692 | rv |= sysfs_set_num(info, NULL, "layout", info->new_layout); |
693 | rv |= sysfs_set_num(info, NULL, "raid_disks", | |
a5062b1c | 694 | info->array.raid_disks); |
20a40eca N |
695 | /* We don't set 'new_level' here. That can only happen |
696 | * once the reshape completes. | |
f897078e N |
697 | */ |
698 | } | |
2432ce9b AP |
699 | |
700 | if (info->consistency_policy == CONSISTENCY_POLICY_PPL) { | |
701 | if (sysfs_set_str(info, NULL, "consistency_policy", | |
702 | map_num(consistency_policies, | |
703 | info->consistency_policy))) { | |
704 | pr_err("This kernel does not support PPL\n"); | |
705 | return 1; | |
706 | } | |
707 | } | |
708 | ||
2503d23b NB |
709 | return rv; |
710 | } | |
711 | ||
2904b26f | 712 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume) |
2503d23b | 713 | { |
33a6535d AW |
714 | char dv[PATH_MAX]; |
715 | char nm[PATH_MAX]; | |
2503d23b NB |
716 | char *dname; |
717 | int rv; | |
bb758cca | 718 | int i; |
2503d23b NB |
719 | |
720 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
721 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
722 | if (rv) | |
723 | return rv; | |
724 | ||
725 | memset(nm, 0, sizeof(nm)); | |
bc17158d | 726 | dname = devid2kname(makedev(sd->disk.major, sd->disk.minor)); |
2503d23b NB |
727 | strcpy(sd->sys_name, "dev-"); |
728 | strcpy(sd->sys_name+4, dname); | |
729 | ||
2904b26f DW |
730 | /* test write to see if 'recovery_start' is available */ |
731 | if (resume && sd->recovery_start < MaxSector && | |
732 | sysfs_set_num(sra, sd, "recovery_start", 0)) { | |
733 | sysfs_set_str(sra, sd, "state", "remove"); | |
734 | return -1; | |
735 | } | |
736 | ||
73649188 | 737 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); |
2503d23b NB |
738 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); |
739 | if (sra->array.level != LEVEL_CONTAINER) { | |
2432ce9b AP |
740 | if (sd->consistency_policy == CONSISTENCY_POLICY_PPL) { |
741 | rv |= sysfs_set_num(sra, sd, "ppl_sector", sd->ppl_sector); | |
742 | rv |= sysfs_set_num(sra, sd, "ppl_size", sd->ppl_size); | |
743 | } | |
d23534e4 | 744 | if (sd->recovery_start == MaxSector) |
462906cd N |
745 | /* This can correctly fail if array isn't started, |
746 | * yet, so just ignore status for now. | |
747 | */ | |
d23534e4 | 748 | sysfs_set_str(sra, sd, "state", "insync"); |
899aead0 AK |
749 | if (sd->disk.raid_disk >= 0) |
750 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
2904b26f DW |
751 | if (resume) |
752 | sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start); | |
2503d23b | 753 | } |
bb758cca TM |
754 | if (sd->bb.supported) { |
755 | if (sysfs_set_str(sra, sd, "state", "external_bbl")) { | |
756 | /* | |
757 | * backward compatibility - if kernel doesn't support | |
758 | * bad blocks for external metadata, let it continue | |
759 | * as long as there are none known so far | |
760 | */ | |
761 | if (sd->bb.count) { | |
762 | pr_err("The kernel has no support for bad blocks in external metadata\n"); | |
763 | return -1; | |
764 | } | |
765 | } | |
766 | ||
767 | for (i = 0; i < sd->bb.count; i++) { | |
768 | char s[30]; | |
769 | const struct md_bb_entry *entry = &sd->bb.entries[i]; | |
770 | ||
771 | snprintf(s, sizeof(s) - 1, "%llu %d\n", entry->sector, | |
772 | entry->length); | |
773 | rv |= sysfs_set_str(sra, sd, "bad_blocks", s); | |
774 | } | |
775 | } | |
2503d23b NB |
776 | return rv; |
777 | } | |
90c8b707 | 778 | |
755c99fa | 779 | #if 0 |
90c8b707 DW |
780 | int sysfs_disk_to_sg(int fd) |
781 | { | |
782 | /* from an open block device, try find and open its corresponding | |
783 | * scsi_generic interface | |
784 | */ | |
785 | struct stat st; | |
786 | char path[256]; | |
787 | char sg_path[256]; | |
5418499a | 788 | char sg_major_minor[10]; |
90c8b707 DW |
789 | char *c; |
790 | DIR *dir; | |
791 | struct dirent *de; | |
792 | int major, minor, rv; | |
793 | ||
794 | if (fstat(fd, &st)) | |
795 | return -1; | |
796 | ||
797 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
798 | major(st.st_rdev), minor(st.st_rdev)); | |
799 | ||
800 | dir = opendir(path); | |
801 | if (!dir) | |
802 | return -1; | |
803 | ||
804 | de = readdir(dir); | |
805 | while (de) { | |
806 | if (strncmp("scsi_generic:", de->d_name, | |
807 | strlen("scsi_generic:")) == 0) | |
808 | break; | |
809 | de = readdir(dir); | |
810 | } | |
811 | closedir(dir); | |
812 | ||
813 | if (!de) | |
814 | return -1; | |
815 | ||
816 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
817 | fd = open(sg_path, O_RDONLY); | |
818 | if (fd < 0) | |
819 | return fd; | |
820 | ||
821 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
822 | close(fd); | |
5418499a | 823 | if (rv < 0 || rv == sizeof(sg_major_minor)) |
90c8b707 DW |
824 | return -1; |
825 | else | |
826 | sg_major_minor[rv - 1] = '\0'; | |
827 | ||
828 | c = strchr(sg_major_minor, ':'); | |
829 | *c = '\0'; | |
830 | c++; | |
831 | major = strtol(sg_major_minor, NULL, 10); | |
832 | minor = strtol(c, NULL, 10); | |
833 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
834 | (int) getpid(), major, minor); | |
835 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
836 | fd = open(path, O_RDONLY); | |
837 | unlink(path); | |
838 | return fd; | |
839 | } | |
840 | ||
841 | return -1; | |
842 | } | |
755c99fa | 843 | #endif |
90c8b707 | 844 | |
f1665f72 DW |
845 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) |
846 | { | |
847 | /* from an open block device, try to retrieve it scsi_id */ | |
848 | struct stat st; | |
849 | char path[256]; | |
f1665f72 DW |
850 | DIR *dir; |
851 | struct dirent *de; | |
d8924477 | 852 | int host, bus, target, lun; |
f1665f72 DW |
853 | |
854 | if (fstat(fd, &st)) | |
855 | return 1; | |
856 | ||
fa89bdee | 857 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device", |
f1665f72 DW |
858 | major(st.st_rdev), minor(st.st_rdev)); |
859 | ||
860 | dir = opendir(path); | |
861 | if (!dir) | |
862 | return 1; | |
863 | ||
d8924477 DW |
864 | for (de = readdir(dir); de; de = readdir(dir)) { |
865 | int count; | |
866 | ||
867 | if (de->d_type != DT_DIR) | |
868 | continue; | |
869 | ||
870 | count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun); | |
871 | if (count == 4) | |
f1665f72 | 872 | break; |
f1665f72 DW |
873 | } |
874 | closedir(dir); | |
875 | ||
876 | if (!de) | |
877 | return 1; | |
878 | ||
d8924477 | 879 | *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0); |
f1665f72 DW |
880 | return 0; |
881 | } | |
f94d52f4 | 882 | |
4dd2df09 | 883 | int sysfs_unique_holder(char *devnm, long rdev) |
f94d52f4 | 884 | { |
4dd2df09 | 885 | /* Check that devnm is a holder of rdev, |
f94d52f4 NB |
886 | * and is the only holder. |
887 | * we should be locked against races by | |
4dd2df09 | 888 | * an O_EXCL on devnm |
aab15415 N |
889 | * Return values: |
890 | * 0 - not unique, not even a holder | |
891 | * 1 - unique, this is the only holder. | |
892 | * 2/3 - not unique, there is another holder | |
893 | * -1 - error, cannot find the holders | |
f94d52f4 NB |
894 | */ |
895 | DIR *dir; | |
896 | struct dirent *de; | |
897 | char dirname[100]; | |
898 | char l; | |
aab15415 | 899 | int ret = 0; |
f94d52f4 NB |
900 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", |
901 | major(rdev), minor(rdev)); | |
902 | dir = opendir(dirname); | |
f94d52f4 | 903 | if (!dir) |
aab15415 | 904 | return -1; |
f94d52f4 NB |
905 | l = strlen(dirname); |
906 | while ((de = readdir(dir)) != NULL) { | |
4dd2df09 N |
907 | char buf[100]; |
908 | char *sl; | |
f94d52f4 | 909 | int n; |
f94d52f4 NB |
910 | |
911 | if (de->d_ino == 0) | |
912 | continue; | |
913 | if (de->d_name[0] == '.') | |
914 | continue; | |
915 | strcpy(dirname+l, "/"); | |
916 | strcat(dirname+l, de->d_name); | |
4dd2df09 N |
917 | n = readlink(dirname, buf, sizeof(buf)-1); |
918 | if (n <= 0) | |
93f1df33 | 919 | continue; |
f94d52f4 | 920 | buf[n] = 0; |
4dd2df09 N |
921 | sl = strrchr(buf, '/'); |
922 | if (!sl) | |
aab15415 | 923 | continue; |
4dd2df09 | 924 | sl++; |
f94d52f4 | 925 | |
4dd2df09 | 926 | if (strcmp(devnm, sl) == 0) |
aab15415 N |
927 | ret |= 1; |
928 | else | |
929 | ret |= 2; | |
f94d52f4 NB |
930 | } |
931 | closedir(dir); | |
aab15415 | 932 | return ret; |
f94d52f4 | 933 | } |
38a07ed6 | 934 | |
bc77ed53 DW |
935 | int sysfs_freeze_array(struct mdinfo *sra) |
936 | { | |
937 | /* Try to freeze resync/rebuild on this array/container. | |
938 | * Return -1 if the array is busy, | |
bc77ed53 DW |
939 | * return 0 if this kernel doesn't support 'frozen' |
940 | * return 1 if it worked. | |
941 | */ | |
942 | char buf[20]; | |
943 | ||
944 | if (!sysfs_attribute_available(sra, NULL, "sync_action")) | |
945 | return 1; /* no sync_action == frozen */ | |
946 | if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) | |
947 | return 0; | |
fd324b08 N |
948 | if (strcmp(buf, "frozen\n") == 0) |
949 | /* Already frozen */ | |
950 | return 0; | |
dea3786a | 951 | if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0) |
bc77ed53 DW |
952 | return -1; |
953 | if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0) | |
954 | return 0; | |
955 | return 1; | |
956 | } | |
efc67e8e N |
957 | |
958 | int sysfs_wait(int fd, int *msec) | |
959 | { | |
960 | /* Wait up to '*msec' for fd to have an exception condition. | |
961 | * if msec == NULL, wait indefinitely. | |
962 | */ | |
963 | fd_set fds; | |
964 | int n; | |
965 | FD_ZERO(&fds); | |
966 | FD_SET(fd, &fds); | |
967 | if (msec == NULL) | |
968 | n = select(fd+1, NULL, NULL, &fds, NULL); | |
969 | else if (*msec < 0) | |
970 | n = 0; | |
971 | else { | |
972 | struct timeval start, end, tv; | |
973 | gettimeofday(&start, NULL); | |
4bffc964 N |
974 | if (*msec < 1000) { |
975 | tv.tv_sec = 0; | |
efc67e8e | 976 | tv.tv_usec = (*msec)*1000; |
4bffc964 | 977 | } else { |
efc67e8e | 978 | tv.tv_sec = (*msec)/1000; |
4bffc964 N |
979 | tv.tv_usec = 0; |
980 | } | |
efc67e8e N |
981 | n = select(fd+1, NULL, NULL, &fds, &tv); |
982 | gettimeofday(&end, NULL); | |
983 | end.tv_sec -= start.tv_sec; | |
984 | *msec -= (end.tv_sec * 1000 + end.tv_usec/1000 | |
4bffc964 | 985 | - start.tv_usec/1000) + 1; |
efc67e8e N |
986 | } |
987 | return n; | |
988 | } |