]>
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; | |
55 | free(d); | |
56 | } | |
57 | free(sra); | |
58 | sra = sra2; | |
8382f19b | 59 | } |
8382f19b NB |
60 | } |
61 | ||
4dd2df09 | 62 | int sysfs_open(char *devnm, char *devname, char *attr) |
549e9569 | 63 | { |
bbb52f2b | 64 | char fname[MAX_SYSFS_PATH_LEN]; |
549e9569 | 65 | int fd; |
549e9569 | 66 | |
bbb52f2b | 67 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/", devnm); |
549e9569 | 68 | if (devname) { |
bbb52f2b TM |
69 | strncat(fname, devname, MAX_SYSFS_PATH_LEN - strlen(fname)); |
70 | strncat(fname, "/", MAX_SYSFS_PATH_LEN - strlen(fname)); | |
549e9569 | 71 | } |
bbb52f2b | 72 | strncat(fname, attr, MAX_SYSFS_PATH_LEN - strlen(fname)); |
549e9569 | 73 | fd = open(fname, O_RDWR); |
ea6d09b0 | 74 | if (fd < 0 && errno == EACCES) |
549e9569 NB |
75 | fd = open(fname, O_RDONLY); |
76 | return fd; | |
77 | } | |
78 | ||
9465f170 GJ |
79 | void sysfs_init_dev(struct mdinfo *mdi, unsigned long devid) |
80 | { | |
81 | snprintf(mdi->sys_name, | |
82 | sizeof(mdi->sys_name), "dev-%s", devid2kname(devid)); | |
83 | } | |
84 | ||
4dd2df09 | 85 | void sysfs_init(struct mdinfo *mdi, int fd, char *devnm) |
f35f2525 | 86 | { |
678a4a36 | 87 | mdi->sys_name[0] = 0; |
f35f2525 | 88 | if (fd >= 0) { |
f35f2525 | 89 | mdu_version_t vers; |
f35f2525 N |
90 | if (ioctl(fd, RAID_VERSION, &vers) != 0) |
91 | return; | |
4dd2df09 | 92 | devnm = fd2devnm(fd); |
f35f2525 | 93 | } |
4dd2df09 | 94 | if (devnm == NULL) |
d7ab966b | 95 | return; |
4dd2df09 | 96 | strcpy(mdi->sys_name, devnm); |
f35f2525 N |
97 | } |
98 | ||
4dd2df09 | 99 | struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options) |
e86c9dd6 | 100 | { |
33a6535d AW |
101 | char fname[PATH_MAX]; |
102 | char buf[PATH_MAX]; | |
e86c9dd6 NB |
103 | char *base; |
104 | char *dbase; | |
7e0f6979 | 105 | struct mdinfo *sra; |
64e103fe | 106 | struct mdinfo *dev, **devp; |
355726fa | 107 | DIR *dir = NULL; |
e86c9dd6 NB |
108 | struct dirent *de; |
109 | ||
503975b9 | 110 | sra = xcalloc(1, sizeof(*sra)); |
4dd2df09 | 111 | sysfs_init(sra, fd, devnm); |
678a4a36 N |
112 | if (sra->sys_name[0] == 0) { |
113 | free(sra); | |
114 | return NULL; | |
115 | } | |
e86c9dd6 | 116 | |
7e0f6979 | 117 | sprintf(fname, "/sys/block/%s/md/", sra->sys_name); |
e86c9dd6 NB |
118 | base = fname + strlen(fname); |
119 | ||
120 | sra->devs = NULL; | |
8382f19b NB |
121 | if (options & GET_VERSION) { |
122 | strcpy(base, "metadata_version"); | |
193b6c0b | 123 | if (load_sys(fname, buf, sizeof(buf))) |
8382f19b | 124 | goto abort; |
294d6f45 | 125 | if (strncmp(buf, "none", 4) == 0) { |
7e0f6979 NB |
126 | sra->array.major_version = |
127 | sra->array.minor_version = -1; | |
294d6f45 NB |
128 | strcpy(sra->text_version, ""); |
129 | } else if (strncmp(buf, "external:", 9) == 0) { | |
142cb9e1 NB |
130 | sra->array.major_version = -1; |
131 | sra->array.minor_version = -2; | |
132 | strcpy(sra->text_version, buf+9); | |
b8ac1967 | 133 | } else { |
8382f19b | 134 | sscanf(buf, "%d.%d", |
7e0f6979 NB |
135 | &sra->array.major_version, |
136 | &sra->array.minor_version); | |
b8ac1967 NB |
137 | strcpy(sra->text_version, buf); |
138 | } | |
8382f19b | 139 | } |
e86c9dd6 NB |
140 | if (options & GET_LEVEL) { |
141 | strcpy(base, "level"); | |
193b6c0b | 142 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 143 | goto abort; |
7e0f6979 | 144 | sra->array.level = map_name(pers, buf); |
e86c9dd6 NB |
145 | } |
146 | if (options & GET_LAYOUT) { | |
147 | strcpy(base, "layout"); | |
193b6c0b | 148 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 149 | goto abort; |
7e0f6979 | 150 | sra->array.layout = strtoul(buf, NULL, 0); |
e86c9dd6 | 151 | } |
549e9569 NB |
152 | if (options & GET_DISKS) { |
153 | strcpy(base, "raid_disks"); | |
193b6c0b | 154 | if (load_sys(fname, buf, sizeof(buf))) |
549e9569 NB |
155 | goto abort; |
156 | sra->array.raid_disks = strtoul(buf, NULL, 0); | |
f1d26766 DW |
157 | } |
158 | if (options & GET_DEGRADED) { | |
159 | strcpy(base, "degraded"); | |
193b6c0b | 160 | if (load_sys(fname, buf, sizeof(buf))) |
f1d26766 DW |
161 | goto abort; |
162 | sra->array.failed_disks = strtoul(buf, NULL, 0); | |
549e9569 | 163 | } |
e86c9dd6 NB |
164 | if (options & GET_COMPONENT) { |
165 | strcpy(base, "component_size"); | |
193b6c0b | 166 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
167 | goto abort; |
168 | sra->component_size = strtoull(buf, NULL, 0); | |
353632d9 NB |
169 | /* sysfs reports "K", but we want sectors */ |
170 | sra->component_size *= 2; | |
e86c9dd6 NB |
171 | } |
172 | if (options & GET_CHUNK) { | |
173 | strcpy(base, "chunk_size"); | |
193b6c0b | 174 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 175 | goto abort; |
7e0f6979 | 176 | sra->array.chunk_size = strtoul(buf, NULL, 0); |
e86c9dd6 | 177 | } |
758d3a8e NB |
178 | if (options & GET_CACHE) { |
179 | strcpy(base, "stripe_cache_size"); | |
193b6c0b | 180 | if (load_sys(fname, buf, sizeof(buf))) |
6a67848a N |
181 | /* Probably level doesn't support it */ |
182 | sra->cache_size = 0; | |
183 | else | |
184 | sra->cache_size = strtoul(buf, NULL, 0); | |
758d3a8e | 185 | } |
37dfc3d6 NB |
186 | if (options & GET_MISMATCH) { |
187 | strcpy(base, "mismatch_cnt"); | |
193b6c0b | 188 | if (load_sys(fname, buf, sizeof(buf))) |
37dfc3d6 NB |
189 | goto abort; |
190 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
191 | } | |
1770662b DW |
192 | if (options & GET_SAFEMODE) { |
193 | int scale = 1; | |
194 | int dot = 0; | |
f21e18ca | 195 | unsigned i; |
1770662b DW |
196 | unsigned long msec; |
197 | size_t len; | |
198 | ||
199 | strcpy(base, "safe_mode_delay"); | |
193b6c0b | 200 | if (load_sys(fname, buf, sizeof(buf))) |
1770662b DW |
201 | goto abort; |
202 | ||
203 | /* remove a period, and count digits after it */ | |
204 | len = strlen(buf); | |
205 | for (i = 0; i < len; i++) { | |
206 | if (dot) { | |
207 | if (isdigit(buf[i])) { | |
208 | buf[i-1] = buf[i]; | |
209 | scale *= 10; | |
210 | } | |
211 | buf[i] = 0; | |
212 | } else if (buf[i] == '.') { | |
213 | dot=1; | |
214 | buf[i] = 0; | |
215 | } | |
216 | } | |
217 | msec = strtoul(buf, NULL, 10); | |
218 | msec = (msec * 1000) / scale; | |
219 | sra->safe_mode_delay = msec; | |
220 | } | |
c0c1acd6 N |
221 | if (options & GET_BITMAP_LOCATION) { |
222 | strcpy(base, "bitmap/location"); | |
193b6c0b | 223 | if (load_sys(fname, buf, sizeof(buf))) |
c0c1acd6 N |
224 | goto abort; |
225 | if (strncmp(buf, "file", 4) == 0) | |
226 | sra->bitmap_offset = 1; | |
227 | else if (strncmp(buf, "none", 4) == 0) | |
228 | sra->bitmap_offset = 0; | |
229 | else if (buf[0] == '+') | |
fbdef498 | 230 | sra->bitmap_offset = strtol(buf+1, NULL, 10); |
c0c1acd6 N |
231 | else |
232 | goto abort; | |
233 | } | |
e86c9dd6 | 234 | |
5aa644c6 SL |
235 | if (options & GET_ARRAY_STATE) { |
236 | strcpy(base, "array_state"); | |
193b6c0b JS |
237 | if (load_sys(fname, sra->sysfs_array_state, |
238 | sizeof(sra->sysfs_array_state))) | |
5aa644c6 SL |
239 | goto abort; |
240 | } else | |
241 | sra->sysfs_array_state[0] = 0; | |
242 | ||
e86c9dd6 NB |
243 | if (! (options & GET_DEVS)) |
244 | return sra; | |
245 | ||
246 | /* Get all the devices as well */ | |
247 | *base = 0; | |
248 | dir = opendir(fname); | |
249 | if (!dir) | |
250 | goto abort; | |
7e0f6979 | 251 | sra->array.spare_disks = 0; |
e86c9dd6 | 252 | |
64e103fe N |
253 | devp = &sra->devs; |
254 | sra->devs = NULL; | |
e86c9dd6 NB |
255 | while ((de = readdir(dir)) != NULL) { |
256 | char *ep; | |
257 | if (de->d_ino == 0 || | |
258 | strncmp(de->d_name, "dev-", 4) != 0) | |
259 | continue; | |
260 | strcpy(base, de->d_name); | |
261 | dbase = base + strlen(base); | |
262 | *dbase++ = '/'; | |
263 | ||
503975b9 | 264 | dev = xmalloc(sizeof(*dev)); |
e86c9dd6 NB |
265 | |
266 | /* Always get slot, major, minor */ | |
267 | strcpy(dbase, "slot"); | |
193b6c0b | 268 | if (load_sys(fname, buf, sizeof(buf))) { |
4795982e DW |
269 | /* hmm... unable to read 'slot' maybe the device |
270 | * is going away? | |
271 | */ | |
272 | strcpy(dbase, "block"); | |
273 | if (readlink(fname, buf, sizeof(buf)) < 0 && | |
274 | errno != ENAMETOOLONG) { | |
275 | /* ...yup device is gone */ | |
276 | free(dev); | |
277 | continue; | |
278 | } else { | |
279 | /* slot is unreadable but 'block' link | |
280 | * still intact... something bad is happening | |
281 | * so abort | |
282 | */ | |
283 | free(dev); | |
284 | goto abort; | |
285 | } | |
64e103fe | 286 | |
4795982e | 287 | } |
4795982e | 288 | strcpy(dev->sys_name, de->d_name); |
06c7f68e NB |
289 | dev->disk.raid_disk = strtoul(buf, &ep, 10); |
290 | if (*ep) dev->disk.raid_disk = -1; | |
e86c9dd6 NB |
291 | |
292 | strcpy(dbase, "block/dev"); | |
193b6c0b | 293 | if (load_sys(fname, buf, sizeof(buf))) { |
b526e52d DW |
294 | /* assume this is a stale reference to a hot |
295 | * removed device | |
296 | */ | |
dab4a513 | 297 | free(dev); |
b526e52d | 298 | continue; |
dab4a513 | 299 | } |
e6fc80a8 | 300 | sra->array.nr_disks++; |
06c7f68e | 301 | sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor); |
e86c9dd6 | 302 | |
dab4a513 | 303 | /* special case check for block devices that can go 'offline' */ |
b526e52d | 304 | strcpy(dbase, "block/device/state"); |
193b6c0b | 305 | if (load_sys(fname, buf, sizeof(buf)) == 0 && |
b526e52d DW |
306 | strncmp(buf, "offline", 7) == 0) { |
307 | free(dev); | |
308 | continue; | |
dab4a513 DW |
309 | } |
310 | ||
311 | /* finally add this disk to the array */ | |
64e103fe N |
312 | *devp = dev; |
313 | devp = & dev->next; | |
314 | dev->next = NULL; | |
dab4a513 | 315 | |
e86c9dd6 NB |
316 | if (options & GET_OFFSET) { |
317 | strcpy(dbase, "offset"); | |
193b6c0b | 318 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 319 | goto abort; |
06c7f68e | 320 | dev->data_offset = strtoull(buf, NULL, 0); |
fe384ca0 | 321 | strcpy(dbase, "new_offset"); |
193b6c0b | 322 | if (load_sys(fname, buf, sizeof(buf)) == 0) |
fe384ca0 N |
323 | dev->new_data_offset = strtoull(buf, NULL, 0); |
324 | else | |
325 | dev->new_data_offset = dev->data_offset; | |
e86c9dd6 NB |
326 | } |
327 | if (options & GET_SIZE) { | |
328 | strcpy(dbase, "size"); | |
193b6c0b | 329 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 | 330 | goto abort; |
047d2e49 | 331 | dev->component_size = strtoull(buf, NULL, 0) * 2; |
e86c9dd6 NB |
332 | } |
333 | if (options & GET_STATE) { | |
06c7f68e | 334 | dev->disk.state = 0; |
e86c9dd6 | 335 | strcpy(dbase, "state"); |
193b6c0b | 336 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
337 | goto abort; |
338 | if (strstr(buf, "in_sync")) | |
06c7f68e | 339 | dev->disk.state |= (1<<MD_DISK_SYNC); |
e86c9dd6 | 340 | if (strstr(buf, "faulty")) |
06c7f68e NB |
341 | dev->disk.state |= (1<<MD_DISK_FAULTY); |
342 | if (dev->disk.state == 0) | |
7e0f6979 | 343 | sra->array.spare_disks++; |
e86c9dd6 NB |
344 | } |
345 | if (options & GET_ERROR) { | |
346 | strcpy(buf, "errors"); | |
193b6c0b | 347 | if (load_sys(fname, buf, sizeof(buf))) |
e86c9dd6 NB |
348 | goto abort; |
349 | dev->errors = strtoul(buf, NULL, 0); | |
350 | } | |
351 | } | |
355726fa | 352 | closedir(dir); |
e86c9dd6 NB |
353 | return sra; |
354 | ||
355 | abort: | |
355726fa NB |
356 | if (dir) |
357 | closedir(dir); | |
8382f19b | 358 | sysfs_free(sra); |
e86c9dd6 NB |
359 | return NULL; |
360 | } | |
361 | ||
1770662b DW |
362 | int sysfs_attr_match(const char *attr, const char *str) |
363 | { | |
364 | /* See if attr, read from a sysfs file, matches | |
365 | * str. They must either be the same, or attr can | |
366 | * have a trailing newline or comma | |
367 | */ | |
368 | while (*attr && *str && *attr == *str) { | |
369 | attr++; | |
370 | str++; | |
371 | } | |
372 | ||
373 | if (*str || (*attr && *attr != ',' && *attr != '\n')) | |
374 | return 0; | |
375 | return 1; | |
376 | } | |
377 | ||
378 | int sysfs_match_word(const char *word, char **list) | |
379 | { | |
380 | int n; | |
381 | for (n=0; list[n]; n++) | |
382 | if (sysfs_attr_match(word, list[n])) | |
383 | break; | |
384 | return n; | |
385 | } | |
386 | ||
e86c9dd6 NB |
387 | unsigned long long get_component_size(int fd) |
388 | { | |
389 | /* Find out the component size of the array. | |
390 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
391 | * size field is only 32bits. | |
392 | * So look in /sys/block/mdXXX/md/component_size | |
353632d9 | 393 | * |
8686f3ed | 394 | * This returns in units of sectors. |
e86c9dd6 NB |
395 | */ |
396 | struct stat stb; | |
bbb52f2b | 397 | char fname[MAX_SYSFS_PATH_LEN]; |
e86c9dd6 | 398 | int n; |
36138e4e JS |
399 | if (fstat(fd, &stb)) |
400 | return 0; | |
f21e18ca | 401 | if (major(stb.st_rdev) != (unsigned)get_mdp_major()) |
bbb52f2b TM |
402 | snprintf(fname, MAX_SYSFS_PATH_LEN, |
403 | "/sys/block/md%d/md/component_size", | |
ea24acd0 | 404 | (int)minor(stb.st_rdev)); |
e86c9dd6 | 405 | else |
bbb52f2b TM |
406 | snprintf(fname, MAX_SYSFS_PATH_LEN, |
407 | "/sys/block/md_d%d/md/component_size", | |
ea24acd0 | 408 | (int)minor(stb.st_rdev)>>MdpMinorShift); |
e86c9dd6 NB |
409 | fd = open(fname, O_RDONLY); |
410 | if (fd < 0) | |
411 | return 0; | |
412 | n = read(fd, fname, sizeof(fname)); | |
413 | close(fd); | |
99f6e521 | 414 | if (n < 0 || n == sizeof(fname)) |
e86c9dd6 NB |
415 | return 0; |
416 | fname[n] = 0; | |
8686f3ed | 417 | return strtoull(fname, NULL, 10) * 2; |
e86c9dd6 NB |
418 | } |
419 | ||
7e0f6979 | 420 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
421 | char *name, char *val) |
422 | { | |
bbb52f2b | 423 | char fname[MAX_SYSFS_PATH_LEN]; |
f21e18ca | 424 | unsigned int n; |
e86c9dd6 | 425 | int fd; |
7e1432fb | 426 | |
bbb52f2b | 427 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 428 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
429 | fd = open(fname, O_WRONLY); |
430 | if (fd < 0) | |
431 | return -1; | |
432 | n = write(fd, val, strlen(val)); | |
433 | close(fd); | |
2a24d7b6 | 434 | if (n != strlen(val)) { |
1ade5cc1 N |
435 | dprintf("failed to write '%s' to '%s' (%s)\n", |
436 | val, fname, strerror(errno)); | |
e86c9dd6 | 437 | return -1; |
2a24d7b6 | 438 | } |
e86c9dd6 NB |
439 | return 0; |
440 | } | |
441 | ||
7e0f6979 | 442 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
443 | char *name, unsigned long long val) |
444 | { | |
445 | char valstr[50]; | |
446 | sprintf(valstr, "%llu", val); | |
447 | return sysfs_set_str(sra, dev, name, valstr); | |
448 | } | |
449 | ||
012a8641 JS |
450 | int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev, |
451 | char *name, long long val) | |
452 | { | |
453 | char valstr[50]; | |
454 | sprintf(valstr, "%lli", val); | |
455 | return sysfs_set_str(sra, dev, name, valstr); | |
456 | } | |
457 | ||
97590376 N |
458 | int sysfs_uevent(struct mdinfo *sra, char *event) |
459 | { | |
bbb52f2b | 460 | char fname[MAX_SYSFS_PATH_LEN]; |
97590376 N |
461 | int n; |
462 | int fd; | |
463 | ||
bbb52f2b | 464 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/uevent", |
97590376 N |
465 | sra->sys_name); |
466 | fd = open(fname, O_WRONLY); | |
467 | if (fd < 0) | |
468 | return -1; | |
469 | n = write(fd, event, strlen(event)); | |
470 | close(fd); | |
e4c72d1d | 471 | if (n != (int)strlen(event)) { |
1ade5cc1 N |
472 | dprintf("failed to write '%s' to '%s' (%s)\n", |
473 | event, fname, strerror(errno)); | |
e4c72d1d LB |
474 | return -1; |
475 | } | |
97590376 | 476 | return 0; |
1011e834 | 477 | } |
97590376 | 478 | |
bc77ed53 DW |
479 | int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name) |
480 | { | |
bbb52f2b | 481 | char fname[MAX_SYSFS_PATH_LEN]; |
bc77ed53 DW |
482 | struct stat st; |
483 | ||
bbb52f2b | 484 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
bc77ed53 DW |
485 | sra->sys_name, dev?dev->sys_name:"", name); |
486 | ||
487 | return stat(fname, &st) == 0; | |
488 | } | |
489 | ||
a6288483 N |
490 | int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, |
491 | char *name) | |
e86c9dd6 | 492 | { |
bbb52f2b | 493 | char fname[MAX_SYSFS_PATH_LEN]; |
e86c9dd6 | 494 | int fd; |
a6288483 | 495 | |
bbb52f2b | 496 | snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 497 | sra->sys_name, dev?dev->sys_name:"", name); |
a6288483 | 498 | fd = open(fname, O_RDWR); |
e86c9dd6 | 499 | if (fd < 0) |
a6288483 N |
500 | fd = open(fname, O_RDONLY); |
501 | return fd; | |
502 | } | |
503 | ||
504 | int sysfs_fd_get_ll(int fd, unsigned long long *val) | |
505 | { | |
506 | char buf[50]; | |
507 | int n; | |
508 | char *ep; | |
509 | ||
510 | lseek(fd, 0, 0); | |
e86c9dd6 | 511 | n = read(fd, buf, sizeof(buf)); |
5418499a | 512 | if (n <= 0 || n == sizeof(buf)) |
6560987b | 513 | return -2; |
e86c9dd6 NB |
514 | buf[n] = 0; |
515 | *val = strtoull(buf, &ep, 0); | |
516 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
517 | return -1; | |
518 | return 0; | |
519 | } | |
2503d23b | 520 | |
a6288483 N |
521 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, |
522 | char *name, unsigned long long *val) | |
523 | { | |
524 | int n; | |
525 | int fd; | |
526 | ||
527 | fd = sysfs_get_fd(sra, dev, name); | |
528 | if (fd < 0) | |
529 | return -1; | |
530 | n = sysfs_fd_get_ll(fd, val); | |
531 | close(fd); | |
532 | return n; | |
533 | } | |
534 | ||
2eba8496 N |
535 | int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2) |
536 | { | |
537 | /* two numbers in this sysfs file, either | |
538 | * NNN (NNN) | |
539 | * or | |
540 | * NNN / NNN | |
541 | */ | |
542 | char buf[80]; | |
543 | int n; | |
544 | char *ep, *ep2; | |
545 | ||
546 | lseek(fd, 0, 0); | |
547 | n = read(fd, buf, sizeof(buf)); | |
5418499a | 548 | if (n <= 0 || n == sizeof(buf)) |
2eba8496 N |
549 | return -2; |
550 | buf[n] = 0; | |
551 | *v1 = strtoull(buf, &ep, 0); | |
552 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
553 | return -1; | |
554 | while (*ep == ' ' || *ep == '/' || *ep == '(') | |
555 | ep++; | |
556 | *v2 = strtoull(ep, &ep2, 0); | |
557 | if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) { | |
558 | *v2 = *v1; | |
559 | return 1; | |
560 | } | |
561 | return 2; | |
562 | } | |
563 | ||
564 | int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev, | |
565 | char *name, unsigned long long *v1, unsigned long long *v2) | |
566 | { | |
567 | int n; | |
568 | int fd; | |
569 | ||
570 | fd = sysfs_get_fd(sra, dev, name); | |
571 | if (fd < 0) | |
572 | return -1; | |
573 | n = sysfs_fd_get_two(fd, v1, v2); | |
574 | close(fd); | |
575 | return n; | |
576 | } | |
577 | ||
7236ee7a N |
578 | int sysfs_fd_get_str(int fd, char *val, int size) |
579 | { | |
580 | int n; | |
581 | ||
582 | lseek(fd, 0, 0); | |
583 | n = read(fd, val, size); | |
5418499a | 584 | if (n <= 0 || n == size) |
7236ee7a N |
585 | return -1; |
586 | val[n] = 0; | |
587 | return n; | |
588 | } | |
589 | ||
93ecfa01 N |
590 | int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev, |
591 | char *name, char *val, int size) | |
592 | { | |
93ecfa01 N |
593 | int n; |
594 | int fd; | |
7236ee7a N |
595 | |
596 | fd = sysfs_get_fd(sra, dev, name); | |
93ecfa01 N |
597 | if (fd < 0) |
598 | return -1; | |
7236ee7a | 599 | n = sysfs_fd_get_str(fd, val, size); |
93ecfa01 | 600 | close(fd); |
93ecfa01 N |
601 | return n; |
602 | } | |
603 | ||
8ed3e5e1 DW |
604 | int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms) |
605 | { | |
606 | unsigned long sec; | |
607 | unsigned long msec; | |
608 | char delay[30]; | |
609 | ||
610 | sec = ms / 1000; | |
0dd3ba30 | 611 | msec = ms % 1000; |
8ed3e5e1 | 612 | |
0dd3ba30 DW |
613 | sprintf(delay, "%ld.%03ld\n", sec, msec); |
614 | /* this '\n' ^ needed for kernels older than 2.6.28 */ | |
8ed3e5e1 DW |
615 | return sysfs_set_str(sra, NULL, "safe_mode_delay", delay); |
616 | } | |
617 | ||
f35f2525 | 618 | int sysfs_set_array(struct mdinfo *info, int vers) |
2503d23b NB |
619 | { |
620 | int rv = 0; | |
f35f2525 | 621 | char ver[100]; |
a5062b1c | 622 | int raid_disks = info->array.raid_disks; |
f35f2525 N |
623 | |
624 | ver[0] = 0; | |
625 | if (info->array.major_version == -1 && | |
626 | info->array.minor_version == -2) { | |
ddb12f6c AK |
627 | char buf[1024]; |
628 | ||
f35f2525 N |
629 | strcat(strcpy(ver, "external:"), info->text_version); |
630 | ||
ddb12f6c AK |
631 | /* meta version might already be set if we are setting |
632 | * new geometry for a reshape. In that case we don't | |
633 | * want to over-write the 'readonly' flag that is | |
634 | * stored in the metadata version. So read the current | |
635 | * version first, and preserve the flag | |
636 | */ | |
637 | if (sysfs_get_str(info, NULL, "metadata_version", | |
638 | buf, 1024) > 0) | |
639 | if (strlen(buf) >= 9 && buf[9] == '-') | |
640 | ver[9] = '-'; | |
641 | ||
f35f2525 N |
642 | if ((vers % 100) < 2 || |
643 | sysfs_set_str(info, NULL, "metadata_version", | |
644 | ver) < 0) { | |
7a862a02 | 645 | pr_err("This kernel does not support external metadata.\n"); |
f35f2525 N |
646 | return 1; |
647 | } | |
648 | } | |
2503d23b NB |
649 | if (info->array.level < 0) |
650 | return 0; /* FIXME */ | |
f35f2525 | 651 | rv |= sysfs_set_str(info, NULL, "level", |
2503d23b | 652 | map_num(pers, info->array.level)); |
a5062b1c AK |
653 | if (info->reshape_active && info->delta_disks != UnSet) |
654 | raid_disks -= info->delta_disks; | |
655 | rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks); | |
f35f2525 N |
656 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size); |
657 | rv |= sysfs_set_num(info, NULL, "layout", info->array.layout); | |
658 | rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2); | |
da9b4a62 DW |
659 | if (info->custom_array_size) { |
660 | int rc; | |
661 | ||
662 | rc = sysfs_set_num(info, NULL, "array_size", | |
663 | info->custom_array_size/2); | |
664 | if (rc && errno == ENOENT) { | |
7a862a02 | 665 | pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n"); |
da9b4a62 DW |
666 | rc = 0; |
667 | } | |
668 | rv |= rc; | |
669 | } | |
670 | ||
f35f2525 N |
671 | if (info->array.level > 0) |
672 | rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start); | |
f897078e N |
673 | |
674 | if (info->reshape_active) { | |
675 | rv |= sysfs_set_num(info, NULL, "reshape_position", | |
676 | info->reshape_progress); | |
677 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk); | |
20a40eca N |
678 | rv |= sysfs_set_num(info, NULL, "layout", info->new_layout); |
679 | rv |= sysfs_set_num(info, NULL, "raid_disks", | |
a5062b1c | 680 | info->array.raid_disks); |
20a40eca N |
681 | /* We don't set 'new_level' here. That can only happen |
682 | * once the reshape completes. | |
f897078e N |
683 | */ |
684 | } | |
2503d23b NB |
685 | return rv; |
686 | } | |
687 | ||
2904b26f | 688 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume) |
2503d23b | 689 | { |
33a6535d AW |
690 | char dv[PATH_MAX]; |
691 | char nm[PATH_MAX]; | |
2503d23b NB |
692 | char *dname; |
693 | int rv; | |
694 | ||
695 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
696 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
697 | if (rv) | |
698 | return rv; | |
699 | ||
700 | memset(nm, 0, sizeof(nm)); | |
bc17158d | 701 | dname = devid2kname(makedev(sd->disk.major, sd->disk.minor)); |
2503d23b NB |
702 | strcpy(sd->sys_name, "dev-"); |
703 | strcpy(sd->sys_name+4, dname); | |
704 | ||
2904b26f DW |
705 | /* test write to see if 'recovery_start' is available */ |
706 | if (resume && sd->recovery_start < MaxSector && | |
707 | sysfs_set_num(sra, sd, "recovery_start", 0)) { | |
708 | sysfs_set_str(sra, sd, "state", "remove"); | |
709 | return -1; | |
710 | } | |
711 | ||
73649188 | 712 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); |
2503d23b NB |
713 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); |
714 | if (sra->array.level != LEVEL_CONTAINER) { | |
d23534e4 | 715 | if (sd->recovery_start == MaxSector) |
462906cd N |
716 | /* This can correctly fail if array isn't started, |
717 | * yet, so just ignore status for now. | |
718 | */ | |
d23534e4 | 719 | sysfs_set_str(sra, sd, "state", "insync"); |
899aead0 AK |
720 | if (sd->disk.raid_disk >= 0) |
721 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
2904b26f DW |
722 | if (resume) |
723 | sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start); | |
2503d23b | 724 | } |
2503d23b NB |
725 | return rv; |
726 | } | |
90c8b707 | 727 | |
755c99fa | 728 | #if 0 |
90c8b707 DW |
729 | int sysfs_disk_to_sg(int fd) |
730 | { | |
731 | /* from an open block device, try find and open its corresponding | |
732 | * scsi_generic interface | |
733 | */ | |
734 | struct stat st; | |
735 | char path[256]; | |
736 | char sg_path[256]; | |
5418499a | 737 | char sg_major_minor[10]; |
90c8b707 DW |
738 | char *c; |
739 | DIR *dir; | |
740 | struct dirent *de; | |
741 | int major, minor, rv; | |
742 | ||
743 | if (fstat(fd, &st)) | |
744 | return -1; | |
745 | ||
746 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
747 | major(st.st_rdev), minor(st.st_rdev)); | |
748 | ||
749 | dir = opendir(path); | |
750 | if (!dir) | |
751 | return -1; | |
752 | ||
753 | de = readdir(dir); | |
754 | while (de) { | |
755 | if (strncmp("scsi_generic:", de->d_name, | |
756 | strlen("scsi_generic:")) == 0) | |
757 | break; | |
758 | de = readdir(dir); | |
759 | } | |
760 | closedir(dir); | |
761 | ||
762 | if (!de) | |
763 | return -1; | |
764 | ||
765 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
766 | fd = open(sg_path, O_RDONLY); | |
767 | if (fd < 0) | |
768 | return fd; | |
769 | ||
770 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
771 | close(fd); | |
5418499a | 772 | if (rv < 0 || rv == sizeof(sg_major_minor)) |
90c8b707 DW |
773 | return -1; |
774 | else | |
775 | sg_major_minor[rv - 1] = '\0'; | |
776 | ||
777 | c = strchr(sg_major_minor, ':'); | |
778 | *c = '\0'; | |
779 | c++; | |
780 | major = strtol(sg_major_minor, NULL, 10); | |
781 | minor = strtol(c, NULL, 10); | |
782 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
783 | (int) getpid(), major, minor); | |
784 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
785 | fd = open(path, O_RDONLY); | |
786 | unlink(path); | |
787 | return fd; | |
788 | } | |
789 | ||
790 | return -1; | |
791 | } | |
755c99fa | 792 | #endif |
90c8b707 | 793 | |
f1665f72 DW |
794 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) |
795 | { | |
796 | /* from an open block device, try to retrieve it scsi_id */ | |
797 | struct stat st; | |
798 | char path[256]; | |
f1665f72 DW |
799 | DIR *dir; |
800 | struct dirent *de; | |
d8924477 | 801 | int host, bus, target, lun; |
f1665f72 DW |
802 | |
803 | if (fstat(fd, &st)) | |
804 | return 1; | |
805 | ||
fa89bdee | 806 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device", |
f1665f72 DW |
807 | major(st.st_rdev), minor(st.st_rdev)); |
808 | ||
809 | dir = opendir(path); | |
810 | if (!dir) | |
811 | return 1; | |
812 | ||
d8924477 DW |
813 | for (de = readdir(dir); de; de = readdir(dir)) { |
814 | int count; | |
815 | ||
816 | if (de->d_type != DT_DIR) | |
817 | continue; | |
818 | ||
819 | count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun); | |
820 | if (count == 4) | |
f1665f72 | 821 | break; |
f1665f72 DW |
822 | } |
823 | closedir(dir); | |
824 | ||
825 | if (!de) | |
826 | return 1; | |
827 | ||
d8924477 | 828 | *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0); |
f1665f72 DW |
829 | return 0; |
830 | } | |
f94d52f4 | 831 | |
4dd2df09 | 832 | int sysfs_unique_holder(char *devnm, long rdev) |
f94d52f4 | 833 | { |
4dd2df09 | 834 | /* Check that devnm is a holder of rdev, |
f94d52f4 NB |
835 | * and is the only holder. |
836 | * we should be locked against races by | |
4dd2df09 | 837 | * an O_EXCL on devnm |
aab15415 N |
838 | * Return values: |
839 | * 0 - not unique, not even a holder | |
840 | * 1 - unique, this is the only holder. | |
841 | * 2/3 - not unique, there is another holder | |
842 | * -1 - error, cannot find the holders | |
f94d52f4 NB |
843 | */ |
844 | DIR *dir; | |
845 | struct dirent *de; | |
846 | char dirname[100]; | |
847 | char l; | |
aab15415 | 848 | int ret = 0; |
f94d52f4 NB |
849 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", |
850 | major(rdev), minor(rdev)); | |
851 | dir = opendir(dirname); | |
f94d52f4 | 852 | if (!dir) |
aab15415 | 853 | return -1; |
f94d52f4 NB |
854 | l = strlen(dirname); |
855 | while ((de = readdir(dir)) != NULL) { | |
4dd2df09 N |
856 | char buf[100]; |
857 | char *sl; | |
f94d52f4 | 858 | int n; |
f94d52f4 NB |
859 | |
860 | if (de->d_ino == 0) | |
861 | continue; | |
862 | if (de->d_name[0] == '.') | |
863 | continue; | |
864 | strcpy(dirname+l, "/"); | |
865 | strcat(dirname+l, de->d_name); | |
4dd2df09 N |
866 | n = readlink(dirname, buf, sizeof(buf)-1); |
867 | if (n <= 0) | |
93f1df33 | 868 | continue; |
f94d52f4 | 869 | buf[n] = 0; |
4dd2df09 N |
870 | sl = strrchr(buf, '/'); |
871 | if (!sl) | |
aab15415 | 872 | continue; |
4dd2df09 | 873 | sl++; |
f94d52f4 | 874 | |
4dd2df09 | 875 | if (strcmp(devnm, sl) == 0) |
aab15415 N |
876 | ret |= 1; |
877 | else | |
878 | ret |= 2; | |
f94d52f4 NB |
879 | } |
880 | closedir(dir); | |
aab15415 | 881 | return ret; |
f94d52f4 | 882 | } |
38a07ed6 | 883 | |
bc77ed53 DW |
884 | int sysfs_freeze_array(struct mdinfo *sra) |
885 | { | |
886 | /* Try to freeze resync/rebuild on this array/container. | |
887 | * Return -1 if the array is busy, | |
bc77ed53 DW |
888 | * return 0 if this kernel doesn't support 'frozen' |
889 | * return 1 if it worked. | |
890 | */ | |
891 | char buf[20]; | |
892 | ||
893 | if (!sysfs_attribute_available(sra, NULL, "sync_action")) | |
894 | return 1; /* no sync_action == frozen */ | |
895 | if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) | |
896 | return 0; | |
fd324b08 N |
897 | if (strcmp(buf, "frozen\n") == 0) |
898 | /* Already frozen */ | |
899 | return 0; | |
dea3786a | 900 | if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0) |
bc77ed53 DW |
901 | return -1; |
902 | if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0) | |
903 | return 0; | |
904 | return 1; | |
905 | } | |
efc67e8e N |
906 | |
907 | int sysfs_wait(int fd, int *msec) | |
908 | { | |
909 | /* Wait up to '*msec' for fd to have an exception condition. | |
910 | * if msec == NULL, wait indefinitely. | |
911 | */ | |
912 | fd_set fds; | |
913 | int n; | |
914 | FD_ZERO(&fds); | |
915 | FD_SET(fd, &fds); | |
916 | if (msec == NULL) | |
917 | n = select(fd+1, NULL, NULL, &fds, NULL); | |
918 | else if (*msec < 0) | |
919 | n = 0; | |
920 | else { | |
921 | struct timeval start, end, tv; | |
922 | gettimeofday(&start, NULL); | |
4bffc964 N |
923 | if (*msec < 1000) { |
924 | tv.tv_sec = 0; | |
efc67e8e | 925 | tv.tv_usec = (*msec)*1000; |
4bffc964 | 926 | } else { |
efc67e8e | 927 | tv.tv_sec = (*msec)/1000; |
4bffc964 N |
928 | tv.tv_usec = 0; |
929 | } | |
efc67e8e N |
930 | n = select(fd+1, NULL, NULL, &fds, &tv); |
931 | gettimeofday(&end, NULL); | |
932 | end.tv_sec -= start.tv_sec; | |
933 | *msec -= (end.tv_sec * 1000 + end.tv_usec/1000 | |
4bffc964 | 934 | - start.tv_usec/1000) + 1; |
efc67e8e N |
935 | } |
936 | return n; | |
937 | } |