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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 | ||
e86c9dd6 NB |
245 | if (! (options & GET_DEVS)) |
246 | return sra; | |
247 | ||
248 | /* Get all the devices as well */ | |
249 | *base = 0; | |
250 | dir = opendir(fname); | |
251 | if (!dir) | |
252 | goto abort; | |
7e0f6979 | 253 | sra->array.spare_disks = 0; |
e86c9dd6 | 254 | |
64e103fe N |
255 | devp = &sra->devs; |
256 | sra->devs = NULL; | |
e86c9dd6 NB |
257 | while ((de = readdir(dir)) != NULL) { |
258 | char *ep; | |
259 | if (de->d_ino == 0 || | |
260 | strncmp(de->d_name, "dev-", 4) != 0) | |
261 | continue; | |
262 | strcpy(base, de->d_name); | |
263 | dbase = base + strlen(base); | |
264 | *dbase++ = '/'; | |
265 | ||
bb758cca | 266 | dev = xcalloc(1, sizeof(*dev)); |
e86c9dd6 NB |
267 | |
268 | /* Always get slot, major, minor */ | |
269 | strcpy(dbase, "slot"); | |
193b6c0b | 270 | if (load_sys(fname, buf, sizeof(buf))) { |
4795982e DW |
271 | /* hmm... unable to read 'slot' maybe the device |
272 | * is going away? | |
273 | */ | |
274 | strcpy(dbase, "block"); | |
275 | if (readlink(fname, buf, sizeof(buf)) < 0 && | |
276 | errno != ENAMETOOLONG) { | |
277 | /* ...yup device is gone */ | |
278 | free(dev); | |
279 | continue; | |
280 | } else { | |
281 | /* slot is unreadable but 'block' link | |
282 | * still intact... something bad is happening | |
283 | * so abort | |
284 | */ | |
285 | free(dev); | |
286 | goto abort; | |
287 | } | |
64e103fe | 288 | |
4795982e | 289 | } |
4795982e | 290 | strcpy(dev->sys_name, de->d_name); |
06c7f68e NB |
291 | dev->disk.raid_disk = strtoul(buf, &ep, 10); |
292 | if (*ep) dev->disk.raid_disk = -1; | |
e86c9dd6 NB |
293 | |
294 | strcpy(dbase, "block/dev"); | |
193b6c0b | 295 | if (load_sys(fname, buf, sizeof(buf))) { |
b526e52d DW |
296 | /* assume this is a stale reference to a hot |
297 | * removed device | |
298 | */ | |
dab4a513 | 299 | free(dev); |
b526e52d | 300 | continue; |
dab4a513 | 301 | } |
e6fc80a8 | 302 | sra->array.nr_disks++; |
06c7f68e | 303 | sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor); |
e86c9dd6 | 304 | |
dab4a513 | 305 | /* special case check for block devices that can go 'offline' */ |
b526e52d | 306 | strcpy(dbase, "block/device/state"); |
193b6c0b | 307 | if (load_sys(fname, buf, sizeof(buf)) == 0 && |
b526e52d DW |
308 | strncmp(buf, "offline", 7) == 0) { |
309 | free(dev); | |
310 | continue; | |
dab4a513 DW |
311 | } |
312 | ||
313 | /* finally add this disk to the array */ | |
64e103fe N |
314 | *devp = dev; |
315 | devp = & dev->next; | |
316 | dev->next = NULL; | |
dab4a513 | 317 | |
e86c9dd6 NB |
318 | if (options & GET_OFFSET) { |
319 | strcpy(dbase, "offset"); | |
193b6c0b | 320 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 321 | goto abort; |
06c7f68e | 322 | dev->data_offset = strtoull(buf, NULL, 0); |
fe384ca0 | 323 | strcpy(dbase, "new_offset"); |
193b6c0b | 324 | if (load_sys(fname, buf, sizeof(buf)) == 0) |
fe384ca0 N |
325 | dev->new_data_offset = strtoull(buf, NULL, 0); |
326 | else | |
327 | dev->new_data_offset = dev->data_offset; | |
e86c9dd6 NB |
328 | } |
329 | if (options & GET_SIZE) { | |
330 | strcpy(dbase, "size"); | |
193b6c0b | 331 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 332 | goto abort; |
047d2e49 | 333 | dev->component_size = strtoull(buf, NULL, 0) * 2; |
e86c9dd6 NB |
334 | } |
335 | if (options & GET_STATE) { | |
06c7f68e | 336 | dev->disk.state = 0; |
e86c9dd6 | 337 | strcpy(dbase, "state"); |
193b6c0b | 338 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
339 | goto abort; |
340 | if (strstr(buf, "in_sync")) | |
06c7f68e | 341 | dev->disk.state |= (1<<MD_DISK_SYNC); |
e86c9dd6 | 342 | if (strstr(buf, "faulty")) |
06c7f68e NB |
343 | dev->disk.state |= (1<<MD_DISK_FAULTY); |
344 | if (dev->disk.state == 0) | |
7e0f6979 | 345 | sra->array.spare_disks++; |
e86c9dd6 NB |
346 | } |
347 | if (options & GET_ERROR) { | |
348 | strcpy(buf, "errors"); | |
193b6c0b | 349 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
350 | goto abort; |
351 | dev->errors = strtoul(buf, NULL, 0); | |
352 | } | |
353 | } | |
355726fa | 354 | closedir(dir); |
e86c9dd6 NB |
355 | return sra; |
356 | ||
357 | abort: | |
355726fa NB |
358 | if (dir) |
359 | closedir(dir); | |
8382f19b | 360 | sysfs_free(sra); |
e86c9dd6 NB |
361 | return NULL; |
362 | } | |
363 | ||
1770662b DW |
364 | int sysfs_attr_match(const char *attr, const char *str) |
365 | { | |
366 | /* See if attr, read from a sysfs file, matches | |
367 | * str. They must either be the same, or attr can | |
368 | * have a trailing newline or comma | |
369 | */ | |
370 | while (*attr && *str && *attr == *str) { | |
371 | attr++; | |
372 | str++; | |
373 | } | |
374 | ||
375 | if (*str || (*attr && *attr != ',' && *attr != '\n')) | |
376 | return 0; | |
377 | return 1; | |
378 | } | |
379 | ||
380 | int sysfs_match_word(const char *word, char **list) | |
381 | { | |
382 | int n; | |
383 | for (n=0; list[n]; n++) | |
384 | if (sysfs_attr_match(word, list[n])) | |
385 | break; | |
386 | return n; | |
387 | } | |
388 | ||
e86c9dd6 NB |
389 | unsigned long long get_component_size(int fd) |
390 | { | |
391 | /* Find out the component size of the array. | |
392 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
393 | * size field is only 32bits. | |
394 | * So look in /sys/block/mdXXX/md/component_size | |
353632d9 | 395 | * |
8686f3ed | 396 | * This returns in units of sectors. |
e86c9dd6 NB |
397 | */ |
398 | struct stat stb; | |
bbb52f2b | 399 | char fname[MAX_SYSFS_PATH_LEN]; |
e86c9dd6 | 400 | int n; |
36138e4e JS |
401 | if (fstat(fd, &stb)) |
402 | return 0; | |
f21e18ca | 403 | if (major(stb.st_rdev) != (unsigned)get_mdp_major()) |
bbb52f2b TM |
404 | snprintf(fname, MAX_SYSFS_PATH_LEN, |
405 | "/sys/block/md%d/md/component_size", | |
ea24acd0 | 406 | (int)minor(stb.st_rdev)); |
e86c9dd6 | 407 | else |
bbb52f2b TM |
408 | snprintf(fname, MAX_SYSFS_PATH_LEN, |
409 | "/sys/block/md_d%d/md/component_size", | |
ea24acd0 | 410 | (int)minor(stb.st_rdev)>>MdpMinorShift); |
e86c9dd6 NB |
411 | fd = open(fname, O_RDONLY); |
412 | if (fd < 0) | |
413 | return 0; | |
414 | n = read(fd, fname, sizeof(fname)); | |
415 | close(fd); | |
99f6e521 | 416 | if (n < 0 || n == sizeof(fname)) |
e86c9dd6 NB |
417 | return 0; |
418 | fname[n] = 0; | |
8686f3ed | 419 | return strtoull(fname, NULL, 10) * 2; |
e86c9dd6 NB |
420 | } |
421 | ||
7e0f6979 | 422 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
423 | char *name, char *val) |
424 | { | |
bbb52f2b | 425 | char fname[MAX_SYSFS_PATH_LEN]; |
f21e18ca | 426 | unsigned int n; |
e86c9dd6 | 427 | int fd; |
7e1432fb | 428 | |
bbb52f2b | 429 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 430 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
431 | fd = open(fname, O_WRONLY); |
432 | if (fd < 0) | |
433 | return -1; | |
434 | n = write(fd, val, strlen(val)); | |
435 | close(fd); | |
2a24d7b6 | 436 | if (n != strlen(val)) { |
1ade5cc1 N |
437 | dprintf("failed to write '%s' to '%s' (%s)\n", |
438 | val, fname, strerror(errno)); | |
e86c9dd6 | 439 | return -1; |
2a24d7b6 | 440 | } |
e86c9dd6 NB |
441 | return 0; |
442 | } | |
443 | ||
7e0f6979 | 444 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
445 | char *name, unsigned long long val) |
446 | { | |
447 | char valstr[50]; | |
448 | sprintf(valstr, "%llu", val); | |
449 | return sysfs_set_str(sra, dev, name, valstr); | |
450 | } | |
451 | ||
012a8641 JS |
452 | int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev, |
453 | char *name, long long val) | |
454 | { | |
455 | char valstr[50]; | |
456 | sprintf(valstr, "%lli", val); | |
457 | return sysfs_set_str(sra, dev, name, valstr); | |
458 | } | |
459 | ||
97590376 N |
460 | int sysfs_uevent(struct mdinfo *sra, char *event) |
461 | { | |
bbb52f2b | 462 | char fname[MAX_SYSFS_PATH_LEN]; |
97590376 N |
463 | int n; |
464 | int fd; | |
465 | ||
bbb52f2b | 466 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/uevent", |
97590376 N |
467 | sra->sys_name); |
468 | fd = open(fname, O_WRONLY); | |
469 | if (fd < 0) | |
470 | return -1; | |
471 | n = write(fd, event, strlen(event)); | |
472 | close(fd); | |
e4c72d1d | 473 | if (n != (int)strlen(event)) { |
1ade5cc1 N |
474 | dprintf("failed to write '%s' to '%s' (%s)\n", |
475 | event, fname, strerror(errno)); | |
e4c72d1d LB |
476 | return -1; |
477 | } | |
97590376 | 478 | return 0; |
1011e834 | 479 | } |
97590376 | 480 | |
bc77ed53 DW |
481 | int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name) |
482 | { | |
bbb52f2b | 483 | char fname[MAX_SYSFS_PATH_LEN]; |
bc77ed53 DW |
484 | struct stat st; |
485 | ||
bbb52f2b | 486 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
bc77ed53 DW |
487 | sra->sys_name, dev?dev->sys_name:"", name); |
488 | ||
489 | return stat(fname, &st) == 0; | |
490 | } | |
491 | ||
a6288483 N |
492 | int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, |
493 | char *name) | |
e86c9dd6 | 494 | { |
bbb52f2b | 495 | char fname[MAX_SYSFS_PATH_LEN]; |
e86c9dd6 | 496 | int fd; |
a6288483 | 497 | |
bbb52f2b | 498 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 499 | sra->sys_name, dev?dev->sys_name:"", name); |
a6288483 | 500 | fd = open(fname, O_RDWR); |
e86c9dd6 | 501 | if (fd < 0) |
a6288483 N |
502 | fd = open(fname, O_RDONLY); |
503 | return fd; | |
504 | } | |
505 | ||
506 | int sysfs_fd_get_ll(int fd, unsigned long long *val) | |
507 | { | |
508 | char buf[50]; | |
509 | int n; | |
510 | char *ep; | |
511 | ||
512 | lseek(fd, 0, 0); | |
e86c9dd6 | 513 | n = read(fd, buf, sizeof(buf)); |
5418499a | 514 | if (n <= 0 || n == sizeof(buf)) |
6560987b | 515 | return -2; |
e86c9dd6 NB |
516 | buf[n] = 0; |
517 | *val = strtoull(buf, &ep, 0); | |
518 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
519 | return -1; | |
520 | return 0; | |
521 | } | |
2503d23b | 522 | |
a6288483 N |
523 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, |
524 | char *name, unsigned long long *val) | |
525 | { | |
526 | int n; | |
527 | int fd; | |
528 | ||
529 | fd = sysfs_get_fd(sra, dev, name); | |
530 | if (fd < 0) | |
531 | return -1; | |
532 | n = sysfs_fd_get_ll(fd, val); | |
533 | close(fd); | |
534 | return n; | |
535 | } | |
536 | ||
2eba8496 N |
537 | int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2) |
538 | { | |
539 | /* two numbers in this sysfs file, either | |
540 | * NNN (NNN) | |
541 | * or | |
542 | * NNN / NNN | |
543 | */ | |
544 | char buf[80]; | |
545 | int n; | |
546 | char *ep, *ep2; | |
547 | ||
548 | lseek(fd, 0, 0); | |
549 | n = read(fd, buf, sizeof(buf)); | |
5418499a | 550 | if (n <= 0 || n == sizeof(buf)) |
2eba8496 N |
551 | return -2; |
552 | buf[n] = 0; | |
553 | *v1 = strtoull(buf, &ep, 0); | |
554 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
555 | return -1; | |
556 | while (*ep == ' ' || *ep == '/' || *ep == '(') | |
557 | ep++; | |
558 | *v2 = strtoull(ep, &ep2, 0); | |
559 | if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) { | |
560 | *v2 = *v1; | |
561 | return 1; | |
562 | } | |
563 | return 2; | |
564 | } | |
565 | ||
566 | int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev, | |
567 | char *name, unsigned long long *v1, unsigned long long *v2) | |
568 | { | |
569 | int n; | |
570 | int fd; | |
571 | ||
572 | fd = sysfs_get_fd(sra, dev, name); | |
573 | if (fd < 0) | |
574 | return -1; | |
575 | n = sysfs_fd_get_two(fd, v1, v2); | |
576 | close(fd); | |
577 | return n; | |
578 | } | |
579 | ||
7236ee7a N |
580 | int sysfs_fd_get_str(int fd, char *val, int size) |
581 | { | |
582 | int n; | |
583 | ||
584 | lseek(fd, 0, 0); | |
585 | n = read(fd, val, size); | |
5418499a | 586 | if (n <= 0 || n == size) |
7236ee7a N |
587 | return -1; |
588 | val[n] = 0; | |
589 | return n; | |
590 | } | |
591 | ||
93ecfa01 N |
592 | int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev, |
593 | char *name, char *val, int size) | |
594 | { | |
93ecfa01 N |
595 | int n; |
596 | int fd; | |
7236ee7a N |
597 | |
598 | fd = sysfs_get_fd(sra, dev, name); | |
93ecfa01 N |
599 | if (fd < 0) |
600 | return -1; | |
7236ee7a | 601 | n = sysfs_fd_get_str(fd, val, size); |
93ecfa01 | 602 | close(fd); |
93ecfa01 N |
603 | return n; |
604 | } | |
605 | ||
8ed3e5e1 DW |
606 | int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms) |
607 | { | |
608 | unsigned long sec; | |
609 | unsigned long msec; | |
610 | char delay[30]; | |
611 | ||
612 | sec = ms / 1000; | |
0dd3ba30 | 613 | msec = ms % 1000; |
8ed3e5e1 | 614 | |
0dd3ba30 DW |
615 | sprintf(delay, "%ld.%03ld\n", sec, msec); |
616 | /* this '\n' ^ needed for kernels older than 2.6.28 */ | |
8ed3e5e1 DW |
617 | return sysfs_set_str(sra, NULL, "safe_mode_delay", delay); |
618 | } | |
619 | ||
f35f2525 | 620 | int sysfs_set_array(struct mdinfo *info, int vers) |
2503d23b NB |
621 | { |
622 | int rv = 0; | |
f35f2525 | 623 | char ver[100]; |
a5062b1c | 624 | int raid_disks = info->array.raid_disks; |
f35f2525 N |
625 | |
626 | ver[0] = 0; | |
627 | if (info->array.major_version == -1 && | |
628 | info->array.minor_version == -2) { | |
ddb12f6c AK |
629 | char buf[1024]; |
630 | ||
f35f2525 N |
631 | strcat(strcpy(ver, "external:"), info->text_version); |
632 | ||
ddb12f6c AK |
633 | /* meta version might already be set if we are setting |
634 | * new geometry for a reshape. In that case we don't | |
635 | * want to over-write the 'readonly' flag that is | |
636 | * stored in the metadata version. So read the current | |
637 | * version first, and preserve the flag | |
638 | */ | |
639 | if (sysfs_get_str(info, NULL, "metadata_version", | |
640 | buf, 1024) > 0) | |
641 | if (strlen(buf) >= 9 && buf[9] == '-') | |
642 | ver[9] = '-'; | |
643 | ||
f35f2525 N |
644 | if ((vers % 100) < 2 || |
645 | sysfs_set_str(info, NULL, "metadata_version", | |
646 | ver) < 0) { | |
7a862a02 | 647 | pr_err("This kernel does not support external metadata.\n"); |
f35f2525 N |
648 | return 1; |
649 | } | |
650 | } | |
2503d23b NB |
651 | if (info->array.level < 0) |
652 | return 0; /* FIXME */ | |
f35f2525 | 653 | rv |= sysfs_set_str(info, NULL, "level", |
2503d23b | 654 | map_num(pers, info->array.level)); |
a5062b1c AK |
655 | if (info->reshape_active && info->delta_disks != UnSet) |
656 | raid_disks -= info->delta_disks; | |
657 | rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks); | |
f35f2525 N |
658 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size); |
659 | rv |= sysfs_set_num(info, NULL, "layout", info->array.layout); | |
660 | rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2); | |
da9b4a62 DW |
661 | if (info->custom_array_size) { |
662 | int rc; | |
663 | ||
664 | rc = sysfs_set_num(info, NULL, "array_size", | |
665 | info->custom_array_size/2); | |
666 | if (rc && errno == ENOENT) { | |
7a862a02 | 667 | pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n"); |
da9b4a62 DW |
668 | rc = 0; |
669 | } | |
670 | rv |= rc; | |
671 | } | |
672 | ||
f35f2525 N |
673 | if (info->array.level > 0) |
674 | rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start); | |
f897078e N |
675 | |
676 | if (info->reshape_active) { | |
677 | rv |= sysfs_set_num(info, NULL, "reshape_position", | |
678 | info->reshape_progress); | |
679 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk); | |
20a40eca N |
680 | rv |= sysfs_set_num(info, NULL, "layout", info->new_layout); |
681 | rv |= sysfs_set_num(info, NULL, "raid_disks", | |
a5062b1c | 682 | info->array.raid_disks); |
20a40eca N |
683 | /* We don't set 'new_level' here. That can only happen |
684 | * once the reshape completes. | |
f897078e N |
685 | */ |
686 | } | |
2503d23b NB |
687 | return rv; |
688 | } | |
689 | ||
2904b26f | 690 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume) |
2503d23b | 691 | { |
33a6535d AW |
692 | char dv[PATH_MAX]; |
693 | char nm[PATH_MAX]; | |
2503d23b NB |
694 | char *dname; |
695 | int rv; | |
bb758cca | 696 | int i; |
2503d23b NB |
697 | |
698 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
699 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
700 | if (rv) | |
701 | return rv; | |
702 | ||
703 | memset(nm, 0, sizeof(nm)); | |
bc17158d | 704 | dname = devid2kname(makedev(sd->disk.major, sd->disk.minor)); |
2503d23b NB |
705 | strcpy(sd->sys_name, "dev-"); |
706 | strcpy(sd->sys_name+4, dname); | |
707 | ||
2904b26f DW |
708 | /* test write to see if 'recovery_start' is available */ |
709 | if (resume && sd->recovery_start < MaxSector && | |
710 | sysfs_set_num(sra, sd, "recovery_start", 0)) { | |
711 | sysfs_set_str(sra, sd, "state", "remove"); | |
712 | return -1; | |
713 | } | |
714 | ||
73649188 | 715 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); |
2503d23b NB |
716 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); |
717 | if (sra->array.level != LEVEL_CONTAINER) { | |
d23534e4 | 718 | if (sd->recovery_start == MaxSector) |
462906cd N |
719 | /* This can correctly fail if array isn't started, |
720 | * yet, so just ignore status for now. | |
721 | */ | |
d23534e4 | 722 | sysfs_set_str(sra, sd, "state", "insync"); |
899aead0 AK |
723 | if (sd->disk.raid_disk >= 0) |
724 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
2904b26f DW |
725 | if (resume) |
726 | sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start); | |
2503d23b | 727 | } |
bb758cca TM |
728 | if (sd->bb.supported) { |
729 | if (sysfs_set_str(sra, sd, "state", "external_bbl")) { | |
730 | /* | |
731 | * backward compatibility - if kernel doesn't support | |
732 | * bad blocks for external metadata, let it continue | |
733 | * as long as there are none known so far | |
734 | */ | |
735 | if (sd->bb.count) { | |
736 | pr_err("The kernel has no support for bad blocks in external metadata\n"); | |
737 | return -1; | |
738 | } | |
739 | } | |
740 | ||
741 | for (i = 0; i < sd->bb.count; i++) { | |
742 | char s[30]; | |
743 | const struct md_bb_entry *entry = &sd->bb.entries[i]; | |
744 | ||
745 | snprintf(s, sizeof(s) - 1, "%llu %d\n", entry->sector, | |
746 | entry->length); | |
747 | rv |= sysfs_set_str(sra, sd, "bad_blocks", s); | |
748 | } | |
749 | } | |
2503d23b NB |
750 | return rv; |
751 | } | |
90c8b707 | 752 | |
755c99fa | 753 | #if 0 |
90c8b707 DW |
754 | int sysfs_disk_to_sg(int fd) |
755 | { | |
756 | /* from an open block device, try find and open its corresponding | |
757 | * scsi_generic interface | |
758 | */ | |
759 | struct stat st; | |
760 | char path[256]; | |
761 | char sg_path[256]; | |
5418499a | 762 | char sg_major_minor[10]; |
90c8b707 DW |
763 | char *c; |
764 | DIR *dir; | |
765 | struct dirent *de; | |
766 | int major, minor, rv; | |
767 | ||
768 | if (fstat(fd, &st)) | |
769 | return -1; | |
770 | ||
771 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
772 | major(st.st_rdev), minor(st.st_rdev)); | |
773 | ||
774 | dir = opendir(path); | |
775 | if (!dir) | |
776 | return -1; | |
777 | ||
778 | de = readdir(dir); | |
779 | while (de) { | |
780 | if (strncmp("scsi_generic:", de->d_name, | |
781 | strlen("scsi_generic:")) == 0) | |
782 | break; | |
783 | de = readdir(dir); | |
784 | } | |
785 | closedir(dir); | |
786 | ||
787 | if (!de) | |
788 | return -1; | |
789 | ||
790 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
791 | fd = open(sg_path, O_RDONLY); | |
792 | if (fd < 0) | |
793 | return fd; | |
794 | ||
795 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
796 | close(fd); | |
5418499a | 797 | if (rv < 0 || rv == sizeof(sg_major_minor)) |
90c8b707 DW |
798 | return -1; |
799 | else | |
800 | sg_major_minor[rv - 1] = '\0'; | |
801 | ||
802 | c = strchr(sg_major_minor, ':'); | |
803 | *c = '\0'; | |
804 | c++; | |
805 | major = strtol(sg_major_minor, NULL, 10); | |
806 | minor = strtol(c, NULL, 10); | |
807 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
808 | (int) getpid(), major, minor); | |
809 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
810 | fd = open(path, O_RDONLY); | |
811 | unlink(path); | |
812 | return fd; | |
813 | } | |
814 | ||
815 | return -1; | |
816 | } | |
755c99fa | 817 | #endif |
90c8b707 | 818 | |
f1665f72 DW |
819 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) |
820 | { | |
821 | /* from an open block device, try to retrieve it scsi_id */ | |
822 | struct stat st; | |
823 | char path[256]; | |
f1665f72 DW |
824 | DIR *dir; |
825 | struct dirent *de; | |
d8924477 | 826 | int host, bus, target, lun; |
f1665f72 DW |
827 | |
828 | if (fstat(fd, &st)) | |
829 | return 1; | |
830 | ||
fa89bdee | 831 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device", |
f1665f72 DW |
832 | major(st.st_rdev), minor(st.st_rdev)); |
833 | ||
834 | dir = opendir(path); | |
835 | if (!dir) | |
836 | return 1; | |
837 | ||
d8924477 DW |
838 | for (de = readdir(dir); de; de = readdir(dir)) { |
839 | int count; | |
840 | ||
841 | if (de->d_type != DT_DIR) | |
842 | continue; | |
843 | ||
844 | count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun); | |
845 | if (count == 4) | |
f1665f72 | 846 | break; |
f1665f72 DW |
847 | } |
848 | closedir(dir); | |
849 | ||
850 | if (!de) | |
851 | return 1; | |
852 | ||
d8924477 | 853 | *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0); |
f1665f72 DW |
854 | return 0; |
855 | } | |
f94d52f4 | 856 | |
4dd2df09 | 857 | int sysfs_unique_holder(char *devnm, long rdev) |
f94d52f4 | 858 | { |
4dd2df09 | 859 | /* Check that devnm is a holder of rdev, |
f94d52f4 NB |
860 | * and is the only holder. |
861 | * we should be locked against races by | |
4dd2df09 | 862 | * an O_EXCL on devnm |
aab15415 N |
863 | * Return values: |
864 | * 0 - not unique, not even a holder | |
865 | * 1 - unique, this is the only holder. | |
866 | * 2/3 - not unique, there is another holder | |
867 | * -1 - error, cannot find the holders | |
f94d52f4 NB |
868 | */ |
869 | DIR *dir; | |
870 | struct dirent *de; | |
871 | char dirname[100]; | |
872 | char l; | |
aab15415 | 873 | int ret = 0; |
f94d52f4 NB |
874 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", |
875 | major(rdev), minor(rdev)); | |
876 | dir = opendir(dirname); | |
f94d52f4 | 877 | if (!dir) |
aab15415 | 878 | return -1; |
f94d52f4 NB |
879 | l = strlen(dirname); |
880 | while ((de = readdir(dir)) != NULL) { | |
4dd2df09 N |
881 | char buf[100]; |
882 | char *sl; | |
f94d52f4 | 883 | int n; |
f94d52f4 NB |
884 | |
885 | if (de->d_ino == 0) | |
886 | continue; | |
887 | if (de->d_name[0] == '.') | |
888 | continue; | |
889 | strcpy(dirname+l, "/"); | |
890 | strcat(dirname+l, de->d_name); | |
4dd2df09 N |
891 | n = readlink(dirname, buf, sizeof(buf)-1); |
892 | if (n <= 0) | |
93f1df33 | 893 | continue; |
f94d52f4 | 894 | buf[n] = 0; |
4dd2df09 N |
895 | sl = strrchr(buf, '/'); |
896 | if (!sl) | |
aab15415 | 897 | continue; |
4dd2df09 | 898 | sl++; |
f94d52f4 | 899 | |
4dd2df09 | 900 | if (strcmp(devnm, sl) == 0) |
aab15415 N |
901 | ret |= 1; |
902 | else | |
903 | ret |= 2; | |
f94d52f4 NB |
904 | } |
905 | closedir(dir); | |
aab15415 | 906 | return ret; |
f94d52f4 | 907 | } |
38a07ed6 | 908 | |
bc77ed53 DW |
909 | int sysfs_freeze_array(struct mdinfo *sra) |
910 | { | |
911 | /* Try to freeze resync/rebuild on this array/container. | |
912 | * Return -1 if the array is busy, | |
bc77ed53 DW |
913 | * return 0 if this kernel doesn't support 'frozen' |
914 | * return 1 if it worked. | |
915 | */ | |
916 | char buf[20]; | |
917 | ||
918 | if (!sysfs_attribute_available(sra, NULL, "sync_action")) | |
919 | return 1; /* no sync_action == frozen */ | |
920 | if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) | |
921 | return 0; | |
fd324b08 N |
922 | if (strcmp(buf, "frozen\n") == 0) |
923 | /* Already frozen */ | |
924 | return 0; | |
dea3786a | 925 | if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0) |
bc77ed53 DW |
926 | return -1; |
927 | if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0) | |
928 | return 0; | |
929 | return 1; | |
930 | } | |
efc67e8e N |
931 | |
932 | int sysfs_wait(int fd, int *msec) | |
933 | { | |
934 | /* Wait up to '*msec' for fd to have an exception condition. | |
935 | * if msec == NULL, wait indefinitely. | |
936 | */ | |
937 | fd_set fds; | |
938 | int n; | |
939 | FD_ZERO(&fds); | |
940 | FD_SET(fd, &fds); | |
941 | if (msec == NULL) | |
942 | n = select(fd+1, NULL, NULL, &fds, NULL); | |
943 | else if (*msec < 0) | |
944 | n = 0; | |
945 | else { | |
946 | struct timeval start, end, tv; | |
947 | gettimeofday(&start, NULL); | |
4bffc964 N |
948 | if (*msec < 1000) { |
949 | tv.tv_sec = 0; | |
efc67e8e | 950 | tv.tv_usec = (*msec)*1000; |
4bffc964 | 951 | } else { |
efc67e8e | 952 | tv.tv_sec = (*msec)/1000; |
4bffc964 N |
953 | tv.tv_usec = 0; |
954 | } | |
efc67e8e N |
955 | n = select(fd+1, NULL, NULL, &fds, &tv); |
956 | gettimeofday(&end, NULL); | |
957 | end.tv_sec -= start.tv_sec; | |
958 | *msec -= (end.tv_sec * 1000 + end.tv_usec/1000 | |
4bffc964 | 959 | - start.tv_usec/1000) + 1; |
efc67e8e N |
960 | } |
961 | return n; | |
962 | } |