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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 NB |
29 | |
30 | int load_sys(char *path, char *buf) | |
31 | { | |
32 | int fd = open(path, O_RDONLY); | |
33 | int n; | |
34 | if (fd < 0) | |
35 | return -1; | |
36 | n = read(fd, buf, 1024); | |
37 | close(fd); | |
2f6079dc | 38 | if (n <0 || n >= 1024) |
e86c9dd6 NB |
39 | return -1; |
40 | buf[n] = 0; | |
8dfb8619 | 41 | if (n && buf[n-1] == '\n') |
e86c9dd6 NB |
42 | buf[n-1] = 0; |
43 | return 0; | |
44 | } | |
45 | ||
7e0f6979 | 46 | void sysfs_free(struct mdinfo *sra) |
8382f19b | 47 | { |
7e0f6979 NB |
48 | while (sra) { |
49 | struct mdinfo *sra2 = sra->next; | |
50 | while (sra->devs) { | |
51 | struct mdinfo *d = sra->devs; | |
52 | sra->devs = d->next; | |
53 | free(d); | |
54 | } | |
55 | free(sra); | |
56 | sra = sra2; | |
8382f19b | 57 | } |
8382f19b NB |
58 | } |
59 | ||
4dd2df09 | 60 | int sysfs_open(char *devnm, char *devname, char *attr) |
549e9569 NB |
61 | { |
62 | char fname[50]; | |
549e9569 | 63 | int fd; |
549e9569 | 64 | |
4dd2df09 | 65 | sprintf(fname, "/sys/block/%s/md/", devnm); |
549e9569 NB |
66 | if (devname) { |
67 | strcat(fname, devname); | |
68 | strcat(fname, "/"); | |
69 | } | |
70 | strcat(fname, attr); | |
71 | fd = open(fname, O_RDWR); | |
ea6d09b0 | 72 | if (fd < 0 && errno == EACCES) |
549e9569 NB |
73 | fd = open(fname, O_RDONLY); |
74 | return fd; | |
75 | } | |
76 | ||
9465f170 GJ |
77 | void sysfs_init_dev(struct mdinfo *mdi, unsigned long devid) |
78 | { | |
79 | snprintf(mdi->sys_name, | |
80 | sizeof(mdi->sys_name), "dev-%s", devid2kname(devid)); | |
81 | } | |
82 | ||
4dd2df09 | 83 | void sysfs_init(struct mdinfo *mdi, int fd, char *devnm) |
f35f2525 | 84 | { |
678a4a36 | 85 | mdi->sys_name[0] = 0; |
f35f2525 | 86 | if (fd >= 0) { |
f35f2525 | 87 | mdu_version_t vers; |
f35f2525 N |
88 | if (ioctl(fd, RAID_VERSION, &vers) != 0) |
89 | return; | |
4dd2df09 | 90 | devnm = fd2devnm(fd); |
f35f2525 | 91 | } |
4dd2df09 | 92 | if (devnm == NULL) |
d7ab966b | 93 | return; |
4dd2df09 | 94 | strcpy(mdi->sys_name, devnm); |
f35f2525 N |
95 | } |
96 | ||
4dd2df09 | 97 | struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options) |
e86c9dd6 | 98 | { |
33a6535d AW |
99 | char fname[PATH_MAX]; |
100 | char buf[PATH_MAX]; | |
e86c9dd6 NB |
101 | char *base; |
102 | char *dbase; | |
7e0f6979 | 103 | struct mdinfo *sra; |
64e103fe | 104 | struct mdinfo *dev, **devp; |
355726fa | 105 | DIR *dir = NULL; |
e86c9dd6 NB |
106 | struct dirent *de; |
107 | ||
503975b9 | 108 | sra = xcalloc(1, sizeof(*sra)); |
4dd2df09 | 109 | sysfs_init(sra, fd, devnm); |
678a4a36 N |
110 | if (sra->sys_name[0] == 0) { |
111 | free(sra); | |
112 | return NULL; | |
113 | } | |
e86c9dd6 | 114 | |
7e0f6979 | 115 | sprintf(fname, "/sys/block/%s/md/", sra->sys_name); |
e86c9dd6 NB |
116 | base = fname + strlen(fname); |
117 | ||
118 | sra->devs = NULL; | |
8382f19b NB |
119 | if (options & GET_VERSION) { |
120 | strcpy(base, "metadata_version"); | |
121 | if (load_sys(fname, buf)) | |
122 | goto abort; | |
294d6f45 | 123 | if (strncmp(buf, "none", 4) == 0) { |
7e0f6979 NB |
124 | sra->array.major_version = |
125 | sra->array.minor_version = -1; | |
294d6f45 NB |
126 | strcpy(sra->text_version, ""); |
127 | } else if (strncmp(buf, "external:", 9) == 0) { | |
142cb9e1 NB |
128 | sra->array.major_version = -1; |
129 | sra->array.minor_version = -2; | |
130 | strcpy(sra->text_version, buf+9); | |
b8ac1967 | 131 | } else { |
8382f19b | 132 | sscanf(buf, "%d.%d", |
7e0f6979 NB |
133 | &sra->array.major_version, |
134 | &sra->array.minor_version); | |
b8ac1967 NB |
135 | strcpy(sra->text_version, buf); |
136 | } | |
8382f19b | 137 | } |
e86c9dd6 NB |
138 | if (options & GET_LEVEL) { |
139 | strcpy(base, "level"); | |
140 | if (load_sys(fname, buf)) | |
141 | goto abort; | |
7e0f6979 | 142 | sra->array.level = map_name(pers, buf); |
e86c9dd6 NB |
143 | } |
144 | if (options & GET_LAYOUT) { | |
145 | strcpy(base, "layout"); | |
146 | if (load_sys(fname, buf)) | |
147 | goto abort; | |
7e0f6979 | 148 | sra->array.layout = strtoul(buf, NULL, 0); |
e86c9dd6 | 149 | } |
549e9569 NB |
150 | if (options & GET_DISKS) { |
151 | strcpy(base, "raid_disks"); | |
152 | if (load_sys(fname, buf)) | |
153 | goto abort; | |
154 | sra->array.raid_disks = strtoul(buf, NULL, 0); | |
f1d26766 DW |
155 | } |
156 | if (options & GET_DEGRADED) { | |
157 | strcpy(base, "degraded"); | |
158 | if (load_sys(fname, buf)) | |
159 | goto abort; | |
160 | sra->array.failed_disks = strtoul(buf, NULL, 0); | |
549e9569 | 161 | } |
e86c9dd6 NB |
162 | if (options & GET_COMPONENT) { |
163 | strcpy(base, "component_size"); | |
164 | if (load_sys(fname, buf)) | |
165 | goto abort; | |
166 | sra->component_size = strtoull(buf, NULL, 0); | |
353632d9 NB |
167 | /* sysfs reports "K", but we want sectors */ |
168 | sra->component_size *= 2; | |
e86c9dd6 NB |
169 | } |
170 | if (options & GET_CHUNK) { | |
171 | strcpy(base, "chunk_size"); | |
172 | if (load_sys(fname, buf)) | |
173 | goto abort; | |
7e0f6979 | 174 | sra->array.chunk_size = strtoul(buf, NULL, 0); |
e86c9dd6 | 175 | } |
758d3a8e NB |
176 | if (options & GET_CACHE) { |
177 | strcpy(base, "stripe_cache_size"); | |
178 | if (load_sys(fname, buf)) | |
6a67848a N |
179 | /* Probably level doesn't support it */ |
180 | sra->cache_size = 0; | |
181 | else | |
182 | sra->cache_size = strtoul(buf, NULL, 0); | |
758d3a8e | 183 | } |
37dfc3d6 NB |
184 | if (options & GET_MISMATCH) { |
185 | strcpy(base, "mismatch_cnt"); | |
186 | if (load_sys(fname, buf)) | |
187 | goto abort; | |
188 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
189 | } | |
1770662b DW |
190 | if (options & GET_SAFEMODE) { |
191 | int scale = 1; | |
192 | int dot = 0; | |
f21e18ca | 193 | unsigned i; |
1770662b DW |
194 | unsigned long msec; |
195 | size_t len; | |
196 | ||
197 | strcpy(base, "safe_mode_delay"); | |
198 | if (load_sys(fname, buf)) | |
199 | goto abort; | |
200 | ||
201 | /* remove a period, and count digits after it */ | |
202 | len = strlen(buf); | |
203 | for (i = 0; i < len; i++) { | |
204 | if (dot) { | |
205 | if (isdigit(buf[i])) { | |
206 | buf[i-1] = buf[i]; | |
207 | scale *= 10; | |
208 | } | |
209 | buf[i] = 0; | |
210 | } else if (buf[i] == '.') { | |
211 | dot=1; | |
212 | buf[i] = 0; | |
213 | } | |
214 | } | |
215 | msec = strtoul(buf, NULL, 10); | |
216 | msec = (msec * 1000) / scale; | |
217 | sra->safe_mode_delay = msec; | |
218 | } | |
c0c1acd6 N |
219 | if (options & GET_BITMAP_LOCATION) { |
220 | strcpy(base, "bitmap/location"); | |
221 | if (load_sys(fname, buf)) | |
222 | goto abort; | |
223 | if (strncmp(buf, "file", 4) == 0) | |
224 | sra->bitmap_offset = 1; | |
225 | else if (strncmp(buf, "none", 4) == 0) | |
226 | sra->bitmap_offset = 0; | |
227 | else if (buf[0] == '+') | |
fbdef498 | 228 | sra->bitmap_offset = strtol(buf+1, NULL, 10); |
c0c1acd6 N |
229 | else |
230 | goto abort; | |
231 | } | |
e86c9dd6 NB |
232 | |
233 | if (! (options & GET_DEVS)) | |
234 | return sra; | |
235 | ||
236 | /* Get all the devices as well */ | |
237 | *base = 0; | |
238 | dir = opendir(fname); | |
239 | if (!dir) | |
240 | goto abort; | |
7e0f6979 | 241 | sra->array.spare_disks = 0; |
e86c9dd6 | 242 | |
64e103fe N |
243 | devp = &sra->devs; |
244 | sra->devs = NULL; | |
e86c9dd6 NB |
245 | while ((de = readdir(dir)) != NULL) { |
246 | char *ep; | |
247 | if (de->d_ino == 0 || | |
248 | strncmp(de->d_name, "dev-", 4) != 0) | |
249 | continue; | |
250 | strcpy(base, de->d_name); | |
251 | dbase = base + strlen(base); | |
252 | *dbase++ = '/'; | |
253 | ||
503975b9 | 254 | dev = xmalloc(sizeof(*dev)); |
e86c9dd6 NB |
255 | |
256 | /* Always get slot, major, minor */ | |
257 | strcpy(dbase, "slot"); | |
4795982e DW |
258 | if (load_sys(fname, buf)) { |
259 | /* hmm... unable to read 'slot' maybe the device | |
260 | * is going away? | |
261 | */ | |
262 | strcpy(dbase, "block"); | |
263 | if (readlink(fname, buf, sizeof(buf)) < 0 && | |
264 | errno != ENAMETOOLONG) { | |
265 | /* ...yup device is gone */ | |
266 | free(dev); | |
267 | continue; | |
268 | } else { | |
269 | /* slot is unreadable but 'block' link | |
270 | * still intact... something bad is happening | |
271 | * so abort | |
272 | */ | |
273 | free(dev); | |
274 | goto abort; | |
275 | } | |
64e103fe | 276 | |
4795982e | 277 | } |
4795982e | 278 | strcpy(dev->sys_name, de->d_name); |
06c7f68e NB |
279 | dev->disk.raid_disk = strtoul(buf, &ep, 10); |
280 | if (*ep) dev->disk.raid_disk = -1; | |
e86c9dd6 NB |
281 | |
282 | strcpy(dbase, "block/dev"); | |
dab4a513 | 283 | if (load_sys(fname, buf)) { |
b526e52d DW |
284 | /* assume this is a stale reference to a hot |
285 | * removed device | |
286 | */ | |
dab4a513 | 287 | free(dev); |
b526e52d | 288 | continue; |
dab4a513 | 289 | } |
e6fc80a8 | 290 | sra->array.nr_disks++; |
06c7f68e | 291 | sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor); |
e86c9dd6 | 292 | |
dab4a513 | 293 | /* special case check for block devices that can go 'offline' */ |
b526e52d DW |
294 | strcpy(dbase, "block/device/state"); |
295 | if (load_sys(fname, buf) == 0 && | |
296 | strncmp(buf, "offline", 7) == 0) { | |
297 | free(dev); | |
298 | continue; | |
dab4a513 DW |
299 | } |
300 | ||
301 | /* finally add this disk to the array */ | |
64e103fe N |
302 | *devp = dev; |
303 | devp = & dev->next; | |
304 | dev->next = NULL; | |
dab4a513 | 305 | |
e86c9dd6 NB |
306 | if (options & GET_OFFSET) { |
307 | strcpy(dbase, "offset"); | |
308 | if (load_sys(fname, buf)) | |
309 | goto abort; | |
06c7f68e | 310 | dev->data_offset = strtoull(buf, NULL, 0); |
fe384ca0 N |
311 | strcpy(dbase, "new_offset"); |
312 | if (load_sys(fname, buf) == 0) | |
313 | dev->new_data_offset = strtoull(buf, NULL, 0); | |
314 | else | |
315 | dev->new_data_offset = dev->data_offset; | |
e86c9dd6 NB |
316 | } |
317 | if (options & GET_SIZE) { | |
318 | strcpy(dbase, "size"); | |
319 | if (load_sys(fname, buf)) | |
320 | goto abort; | |
047d2e49 | 321 | dev->component_size = strtoull(buf, NULL, 0) * 2; |
e86c9dd6 NB |
322 | } |
323 | if (options & GET_STATE) { | |
06c7f68e | 324 | dev->disk.state = 0; |
e86c9dd6 NB |
325 | strcpy(dbase, "state"); |
326 | if (load_sys(fname, buf)) | |
327 | goto abort; | |
328 | if (strstr(buf, "in_sync")) | |
06c7f68e | 329 | dev->disk.state |= (1<<MD_DISK_SYNC); |
e86c9dd6 | 330 | if (strstr(buf, "faulty")) |
06c7f68e NB |
331 | dev->disk.state |= (1<<MD_DISK_FAULTY); |
332 | if (dev->disk.state == 0) | |
7e0f6979 | 333 | sra->array.spare_disks++; |
e86c9dd6 NB |
334 | } |
335 | if (options & GET_ERROR) { | |
336 | strcpy(buf, "errors"); | |
337 | if (load_sys(fname, buf)) | |
338 | goto abort; | |
339 | dev->errors = strtoul(buf, NULL, 0); | |
340 | } | |
341 | } | |
355726fa | 342 | closedir(dir); |
e86c9dd6 NB |
343 | return sra; |
344 | ||
345 | abort: | |
355726fa NB |
346 | if (dir) |
347 | closedir(dir); | |
8382f19b | 348 | sysfs_free(sra); |
e86c9dd6 NB |
349 | return NULL; |
350 | } | |
351 | ||
1770662b DW |
352 | int sysfs_attr_match(const char *attr, const char *str) |
353 | { | |
354 | /* See if attr, read from a sysfs file, matches | |
355 | * str. They must either be the same, or attr can | |
356 | * have a trailing newline or comma | |
357 | */ | |
358 | while (*attr && *str && *attr == *str) { | |
359 | attr++; | |
360 | str++; | |
361 | } | |
362 | ||
363 | if (*str || (*attr && *attr != ',' && *attr != '\n')) | |
364 | return 0; | |
365 | return 1; | |
366 | } | |
367 | ||
368 | int sysfs_match_word(const char *word, char **list) | |
369 | { | |
370 | int n; | |
371 | for (n=0; list[n]; n++) | |
372 | if (sysfs_attr_match(word, list[n])) | |
373 | break; | |
374 | return n; | |
375 | } | |
376 | ||
e86c9dd6 NB |
377 | unsigned long long get_component_size(int fd) |
378 | { | |
379 | /* Find out the component size of the array. | |
380 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
381 | * size field is only 32bits. | |
382 | * So look in /sys/block/mdXXX/md/component_size | |
353632d9 | 383 | * |
8686f3ed | 384 | * This returns in units of sectors. |
e86c9dd6 NB |
385 | */ |
386 | struct stat stb; | |
387 | char fname[50]; | |
388 | int n; | |
389 | if (fstat(fd, &stb)) return 0; | |
f21e18ca | 390 | if (major(stb.st_rdev) != (unsigned)get_mdp_major()) |
e86c9dd6 | 391 | sprintf(fname, "/sys/block/md%d/md/component_size", |
ea24acd0 | 392 | (int)minor(stb.st_rdev)); |
e86c9dd6 NB |
393 | else |
394 | sprintf(fname, "/sys/block/md_d%d/md/component_size", | |
ea24acd0 | 395 | (int)minor(stb.st_rdev)>>MdpMinorShift); |
e86c9dd6 NB |
396 | fd = open(fname, O_RDONLY); |
397 | if (fd < 0) | |
398 | return 0; | |
399 | n = read(fd, fname, sizeof(fname)); | |
400 | close(fd); | |
99f6e521 | 401 | if (n < 0 || n == sizeof(fname)) |
e86c9dd6 NB |
402 | return 0; |
403 | fname[n] = 0; | |
8686f3ed | 404 | return strtoull(fname, NULL, 10) * 2; |
e86c9dd6 NB |
405 | } |
406 | ||
7e0f6979 | 407 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
408 | char *name, char *val) |
409 | { | |
410 | char fname[50]; | |
f21e18ca | 411 | unsigned int n; |
e86c9dd6 | 412 | int fd; |
7e1432fb | 413 | |
e86c9dd6 | 414 | sprintf(fname, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 415 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
416 | fd = open(fname, O_WRONLY); |
417 | if (fd < 0) | |
418 | return -1; | |
419 | n = write(fd, val, strlen(val)); | |
420 | close(fd); | |
2a24d7b6 | 421 | if (n != strlen(val)) { |
1ade5cc1 N |
422 | dprintf("failed to write '%s' to '%s' (%s)\n", |
423 | val, fname, strerror(errno)); | |
e86c9dd6 | 424 | return -1; |
2a24d7b6 | 425 | } |
e86c9dd6 NB |
426 | return 0; |
427 | } | |
428 | ||
7e0f6979 | 429 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
430 | char *name, unsigned long long val) |
431 | { | |
432 | char valstr[50]; | |
433 | sprintf(valstr, "%llu", val); | |
434 | return sysfs_set_str(sra, dev, name, valstr); | |
435 | } | |
436 | ||
012a8641 JS |
437 | int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev, |
438 | char *name, long long val) | |
439 | { | |
440 | char valstr[50]; | |
441 | sprintf(valstr, "%lli", val); | |
442 | return sysfs_set_str(sra, dev, name, valstr); | |
443 | } | |
444 | ||
97590376 N |
445 | int sysfs_uevent(struct mdinfo *sra, char *event) |
446 | { | |
447 | char fname[50]; | |
448 | int n; | |
449 | int fd; | |
450 | ||
451 | sprintf(fname, "/sys/block/%s/uevent", | |
452 | sra->sys_name); | |
453 | fd = open(fname, O_WRONLY); | |
454 | if (fd < 0) | |
455 | return -1; | |
456 | n = write(fd, event, strlen(event)); | |
457 | close(fd); | |
e4c72d1d | 458 | if (n != (int)strlen(event)) { |
1ade5cc1 N |
459 | dprintf("failed to write '%s' to '%s' (%s)\n", |
460 | event, fname, strerror(errno)); | |
e4c72d1d LB |
461 | return -1; |
462 | } | |
97590376 | 463 | return 0; |
1011e834 | 464 | } |
97590376 | 465 | |
bc77ed53 DW |
466 | int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name) |
467 | { | |
468 | char fname[50]; | |
469 | struct stat st; | |
470 | ||
471 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
472 | sra->sys_name, dev?dev->sys_name:"", name); | |
473 | ||
474 | return stat(fname, &st) == 0; | |
475 | } | |
476 | ||
a6288483 N |
477 | int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, |
478 | char *name) | |
e86c9dd6 NB |
479 | { |
480 | char fname[50]; | |
e86c9dd6 | 481 | int fd; |
a6288483 | 482 | |
e86c9dd6 | 483 | sprintf(fname, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 484 | sra->sys_name, dev?dev->sys_name:"", name); |
a6288483 | 485 | fd = open(fname, O_RDWR); |
e86c9dd6 | 486 | if (fd < 0) |
a6288483 N |
487 | fd = open(fname, O_RDONLY); |
488 | return fd; | |
489 | } | |
490 | ||
491 | int sysfs_fd_get_ll(int fd, unsigned long long *val) | |
492 | { | |
493 | char buf[50]; | |
494 | int n; | |
495 | char *ep; | |
496 | ||
497 | lseek(fd, 0, 0); | |
e86c9dd6 | 498 | n = read(fd, buf, sizeof(buf)); |
5418499a | 499 | if (n <= 0 || n == sizeof(buf)) |
6560987b | 500 | return -2; |
e86c9dd6 NB |
501 | buf[n] = 0; |
502 | *val = strtoull(buf, &ep, 0); | |
503 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
504 | return -1; | |
505 | return 0; | |
506 | } | |
2503d23b | 507 | |
a6288483 N |
508 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, |
509 | char *name, unsigned long long *val) | |
510 | { | |
511 | int n; | |
512 | int fd; | |
513 | ||
514 | fd = sysfs_get_fd(sra, dev, name); | |
515 | if (fd < 0) | |
516 | return -1; | |
517 | n = sysfs_fd_get_ll(fd, val); | |
518 | close(fd); | |
519 | return n; | |
520 | } | |
521 | ||
2eba8496 N |
522 | int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2) |
523 | { | |
524 | /* two numbers in this sysfs file, either | |
525 | * NNN (NNN) | |
526 | * or | |
527 | * NNN / NNN | |
528 | */ | |
529 | char buf[80]; | |
530 | int n; | |
531 | char *ep, *ep2; | |
532 | ||
533 | lseek(fd, 0, 0); | |
534 | n = read(fd, buf, sizeof(buf)); | |
5418499a | 535 | if (n <= 0 || n == sizeof(buf)) |
2eba8496 N |
536 | return -2; |
537 | buf[n] = 0; | |
538 | *v1 = strtoull(buf, &ep, 0); | |
539 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
540 | return -1; | |
541 | while (*ep == ' ' || *ep == '/' || *ep == '(') | |
542 | ep++; | |
543 | *v2 = strtoull(ep, &ep2, 0); | |
544 | if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) { | |
545 | *v2 = *v1; | |
546 | return 1; | |
547 | } | |
548 | return 2; | |
549 | } | |
550 | ||
551 | int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev, | |
552 | char *name, unsigned long long *v1, unsigned long long *v2) | |
553 | { | |
554 | int n; | |
555 | int fd; | |
556 | ||
557 | fd = sysfs_get_fd(sra, dev, name); | |
558 | if (fd < 0) | |
559 | return -1; | |
560 | n = sysfs_fd_get_two(fd, v1, v2); | |
561 | close(fd); | |
562 | return n; | |
563 | } | |
564 | ||
7236ee7a N |
565 | int sysfs_fd_get_str(int fd, char *val, int size) |
566 | { | |
567 | int n; | |
568 | ||
569 | lseek(fd, 0, 0); | |
570 | n = read(fd, val, size); | |
5418499a | 571 | if (n <= 0 || n == size) |
7236ee7a N |
572 | return -1; |
573 | val[n] = 0; | |
574 | return n; | |
575 | } | |
576 | ||
93ecfa01 N |
577 | int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev, |
578 | char *name, char *val, int size) | |
579 | { | |
93ecfa01 N |
580 | int n; |
581 | int fd; | |
7236ee7a N |
582 | |
583 | fd = sysfs_get_fd(sra, dev, name); | |
93ecfa01 N |
584 | if (fd < 0) |
585 | return -1; | |
7236ee7a | 586 | n = sysfs_fd_get_str(fd, val, size); |
93ecfa01 | 587 | close(fd); |
93ecfa01 N |
588 | return n; |
589 | } | |
590 | ||
8ed3e5e1 DW |
591 | int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms) |
592 | { | |
593 | unsigned long sec; | |
594 | unsigned long msec; | |
595 | char delay[30]; | |
596 | ||
597 | sec = ms / 1000; | |
0dd3ba30 | 598 | msec = ms % 1000; |
8ed3e5e1 | 599 | |
0dd3ba30 DW |
600 | sprintf(delay, "%ld.%03ld\n", sec, msec); |
601 | /* this '\n' ^ needed for kernels older than 2.6.28 */ | |
8ed3e5e1 DW |
602 | return sysfs_set_str(sra, NULL, "safe_mode_delay", delay); |
603 | } | |
604 | ||
f35f2525 | 605 | int sysfs_set_array(struct mdinfo *info, int vers) |
2503d23b NB |
606 | { |
607 | int rv = 0; | |
f35f2525 | 608 | char ver[100]; |
a5062b1c | 609 | int raid_disks = info->array.raid_disks; |
f35f2525 N |
610 | |
611 | ver[0] = 0; | |
612 | if (info->array.major_version == -1 && | |
613 | info->array.minor_version == -2) { | |
ddb12f6c AK |
614 | char buf[1024]; |
615 | ||
f35f2525 N |
616 | strcat(strcpy(ver, "external:"), info->text_version); |
617 | ||
ddb12f6c AK |
618 | /* meta version might already be set if we are setting |
619 | * new geometry for a reshape. In that case we don't | |
620 | * want to over-write the 'readonly' flag that is | |
621 | * stored in the metadata version. So read the current | |
622 | * version first, and preserve the flag | |
623 | */ | |
624 | if (sysfs_get_str(info, NULL, "metadata_version", | |
625 | buf, 1024) > 0) | |
626 | if (strlen(buf) >= 9 && buf[9] == '-') | |
627 | ver[9] = '-'; | |
628 | ||
f35f2525 N |
629 | if ((vers % 100) < 2 || |
630 | sysfs_set_str(info, NULL, "metadata_version", | |
631 | ver) < 0) { | |
7a862a02 | 632 | pr_err("This kernel does not support external metadata.\n"); |
f35f2525 N |
633 | return 1; |
634 | } | |
635 | } | |
2503d23b NB |
636 | if (info->array.level < 0) |
637 | return 0; /* FIXME */ | |
f35f2525 | 638 | rv |= sysfs_set_str(info, NULL, "level", |
2503d23b | 639 | map_num(pers, info->array.level)); |
a5062b1c AK |
640 | if (info->reshape_active && info->delta_disks != UnSet) |
641 | raid_disks -= info->delta_disks; | |
642 | rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks); | |
f35f2525 N |
643 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size); |
644 | rv |= sysfs_set_num(info, NULL, "layout", info->array.layout); | |
645 | rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2); | |
da9b4a62 DW |
646 | if (info->custom_array_size) { |
647 | int rc; | |
648 | ||
649 | rc = sysfs_set_num(info, NULL, "array_size", | |
650 | info->custom_array_size/2); | |
651 | if (rc && errno == ENOENT) { | |
7a862a02 | 652 | pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n"); |
da9b4a62 DW |
653 | rc = 0; |
654 | } | |
655 | rv |= rc; | |
656 | } | |
657 | ||
f35f2525 N |
658 | if (info->array.level > 0) |
659 | rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start); | |
f897078e N |
660 | |
661 | if (info->reshape_active) { | |
662 | rv |= sysfs_set_num(info, NULL, "reshape_position", | |
663 | info->reshape_progress); | |
664 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk); | |
20a40eca N |
665 | rv |= sysfs_set_num(info, NULL, "layout", info->new_layout); |
666 | rv |= sysfs_set_num(info, NULL, "raid_disks", | |
a5062b1c | 667 | info->array.raid_disks); |
20a40eca N |
668 | /* We don't set 'new_level' here. That can only happen |
669 | * once the reshape completes. | |
f897078e N |
670 | */ |
671 | } | |
2503d23b NB |
672 | return rv; |
673 | } | |
674 | ||
2904b26f | 675 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume) |
2503d23b | 676 | { |
33a6535d AW |
677 | char dv[PATH_MAX]; |
678 | char nm[PATH_MAX]; | |
2503d23b NB |
679 | char *dname; |
680 | int rv; | |
681 | ||
682 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
683 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
684 | if (rv) | |
685 | return rv; | |
686 | ||
687 | memset(nm, 0, sizeof(nm)); | |
bc17158d | 688 | dname = devid2kname(makedev(sd->disk.major, sd->disk.minor)); |
2503d23b NB |
689 | strcpy(sd->sys_name, "dev-"); |
690 | strcpy(sd->sys_name+4, dname); | |
691 | ||
2904b26f DW |
692 | /* test write to see if 'recovery_start' is available */ |
693 | if (resume && sd->recovery_start < MaxSector && | |
694 | sysfs_set_num(sra, sd, "recovery_start", 0)) { | |
695 | sysfs_set_str(sra, sd, "state", "remove"); | |
696 | return -1; | |
697 | } | |
698 | ||
73649188 | 699 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); |
2503d23b NB |
700 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); |
701 | if (sra->array.level != LEVEL_CONTAINER) { | |
d23534e4 | 702 | if (sd->recovery_start == MaxSector) |
462906cd N |
703 | /* This can correctly fail if array isn't started, |
704 | * yet, so just ignore status for now. | |
705 | */ | |
d23534e4 | 706 | sysfs_set_str(sra, sd, "state", "insync"); |
899aead0 AK |
707 | if (sd->disk.raid_disk >= 0) |
708 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
2904b26f DW |
709 | if (resume) |
710 | sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start); | |
2503d23b | 711 | } |
2503d23b NB |
712 | return rv; |
713 | } | |
90c8b707 | 714 | |
755c99fa | 715 | #if 0 |
90c8b707 DW |
716 | int sysfs_disk_to_sg(int fd) |
717 | { | |
718 | /* from an open block device, try find and open its corresponding | |
719 | * scsi_generic interface | |
720 | */ | |
721 | struct stat st; | |
722 | char path[256]; | |
723 | char sg_path[256]; | |
5418499a | 724 | char sg_major_minor[10]; |
90c8b707 DW |
725 | char *c; |
726 | DIR *dir; | |
727 | struct dirent *de; | |
728 | int major, minor, rv; | |
729 | ||
730 | if (fstat(fd, &st)) | |
731 | return -1; | |
732 | ||
733 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
734 | major(st.st_rdev), minor(st.st_rdev)); | |
735 | ||
736 | dir = opendir(path); | |
737 | if (!dir) | |
738 | return -1; | |
739 | ||
740 | de = readdir(dir); | |
741 | while (de) { | |
742 | if (strncmp("scsi_generic:", de->d_name, | |
743 | strlen("scsi_generic:")) == 0) | |
744 | break; | |
745 | de = readdir(dir); | |
746 | } | |
747 | closedir(dir); | |
748 | ||
749 | if (!de) | |
750 | return -1; | |
751 | ||
752 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
753 | fd = open(sg_path, O_RDONLY); | |
754 | if (fd < 0) | |
755 | return fd; | |
756 | ||
757 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
758 | close(fd); | |
5418499a | 759 | if (rv < 0 || rv == sizeof(sg_major_minor)) |
90c8b707 DW |
760 | return -1; |
761 | else | |
762 | sg_major_minor[rv - 1] = '\0'; | |
763 | ||
764 | c = strchr(sg_major_minor, ':'); | |
765 | *c = '\0'; | |
766 | c++; | |
767 | major = strtol(sg_major_minor, NULL, 10); | |
768 | minor = strtol(c, NULL, 10); | |
769 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
770 | (int) getpid(), major, minor); | |
771 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
772 | fd = open(path, O_RDONLY); | |
773 | unlink(path); | |
774 | return fd; | |
775 | } | |
776 | ||
777 | return -1; | |
778 | } | |
755c99fa | 779 | #endif |
90c8b707 | 780 | |
f1665f72 DW |
781 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) |
782 | { | |
783 | /* from an open block device, try to retrieve it scsi_id */ | |
784 | struct stat st; | |
785 | char path[256]; | |
f1665f72 DW |
786 | DIR *dir; |
787 | struct dirent *de; | |
d8924477 | 788 | int host, bus, target, lun; |
f1665f72 DW |
789 | |
790 | if (fstat(fd, &st)) | |
791 | return 1; | |
792 | ||
fa89bdee | 793 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device", |
f1665f72 DW |
794 | major(st.st_rdev), minor(st.st_rdev)); |
795 | ||
796 | dir = opendir(path); | |
797 | if (!dir) | |
798 | return 1; | |
799 | ||
d8924477 DW |
800 | for (de = readdir(dir); de; de = readdir(dir)) { |
801 | int count; | |
802 | ||
803 | if (de->d_type != DT_DIR) | |
804 | continue; | |
805 | ||
806 | count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun); | |
807 | if (count == 4) | |
f1665f72 | 808 | break; |
f1665f72 DW |
809 | } |
810 | closedir(dir); | |
811 | ||
812 | if (!de) | |
813 | return 1; | |
814 | ||
d8924477 | 815 | *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0); |
f1665f72 DW |
816 | return 0; |
817 | } | |
f94d52f4 | 818 | |
4dd2df09 | 819 | int sysfs_unique_holder(char *devnm, long rdev) |
f94d52f4 | 820 | { |
4dd2df09 | 821 | /* Check that devnm is a holder of rdev, |
f94d52f4 NB |
822 | * and is the only holder. |
823 | * we should be locked against races by | |
4dd2df09 | 824 | * an O_EXCL on devnm |
aab15415 N |
825 | * Return values: |
826 | * 0 - not unique, not even a holder | |
827 | * 1 - unique, this is the only holder. | |
828 | * 2/3 - not unique, there is another holder | |
829 | * -1 - error, cannot find the holders | |
f94d52f4 NB |
830 | */ |
831 | DIR *dir; | |
832 | struct dirent *de; | |
833 | char dirname[100]; | |
834 | char l; | |
aab15415 | 835 | int ret = 0; |
f94d52f4 NB |
836 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", |
837 | major(rdev), minor(rdev)); | |
838 | dir = opendir(dirname); | |
f94d52f4 | 839 | if (!dir) |
aab15415 | 840 | return -1; |
f94d52f4 NB |
841 | l = strlen(dirname); |
842 | while ((de = readdir(dir)) != NULL) { | |
4dd2df09 N |
843 | char buf[100]; |
844 | char *sl; | |
f94d52f4 | 845 | int n; |
f94d52f4 NB |
846 | |
847 | if (de->d_ino == 0) | |
848 | continue; | |
849 | if (de->d_name[0] == '.') | |
850 | continue; | |
851 | strcpy(dirname+l, "/"); | |
852 | strcat(dirname+l, de->d_name); | |
4dd2df09 N |
853 | n = readlink(dirname, buf, sizeof(buf)-1); |
854 | if (n <= 0) | |
93f1df33 | 855 | continue; |
f94d52f4 | 856 | buf[n] = 0; |
4dd2df09 N |
857 | sl = strrchr(buf, '/'); |
858 | if (!sl) | |
aab15415 | 859 | continue; |
4dd2df09 | 860 | sl++; |
f94d52f4 | 861 | |
4dd2df09 | 862 | if (strcmp(devnm, sl) == 0) |
aab15415 N |
863 | ret |= 1; |
864 | else | |
865 | ret |= 2; | |
f94d52f4 NB |
866 | } |
867 | closedir(dir); | |
aab15415 | 868 | return ret; |
f94d52f4 | 869 | } |
38a07ed6 | 870 | |
bc77ed53 DW |
871 | int sysfs_freeze_array(struct mdinfo *sra) |
872 | { | |
873 | /* Try to freeze resync/rebuild on this array/container. | |
874 | * Return -1 if the array is busy, | |
bc77ed53 DW |
875 | * return 0 if this kernel doesn't support 'frozen' |
876 | * return 1 if it worked. | |
877 | */ | |
878 | char buf[20]; | |
879 | ||
880 | if (!sysfs_attribute_available(sra, NULL, "sync_action")) | |
881 | return 1; /* no sync_action == frozen */ | |
882 | if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) | |
883 | return 0; | |
fd324b08 N |
884 | if (strcmp(buf, "frozen\n") == 0) |
885 | /* Already frozen */ | |
886 | return 0; | |
dea3786a | 887 | if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0) |
bc77ed53 DW |
888 | return -1; |
889 | if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0) | |
890 | return 0; | |
891 | return 1; | |
892 | } | |
efc67e8e N |
893 | |
894 | int sysfs_wait(int fd, int *msec) | |
895 | { | |
896 | /* Wait up to '*msec' for fd to have an exception condition. | |
897 | * if msec == NULL, wait indefinitely. | |
898 | */ | |
899 | fd_set fds; | |
900 | int n; | |
901 | FD_ZERO(&fds); | |
902 | FD_SET(fd, &fds); | |
903 | if (msec == NULL) | |
904 | n = select(fd+1, NULL, NULL, &fds, NULL); | |
905 | else if (*msec < 0) | |
906 | n = 0; | |
907 | else { | |
908 | struct timeval start, end, tv; | |
909 | gettimeofday(&start, NULL); | |
4bffc964 N |
910 | if (*msec < 1000) { |
911 | tv.tv_sec = 0; | |
efc67e8e | 912 | tv.tv_usec = (*msec)*1000; |
4bffc964 | 913 | } else { |
efc67e8e | 914 | tv.tv_sec = (*msec)/1000; |
4bffc964 N |
915 | tv.tv_usec = 0; |
916 | } | |
efc67e8e N |
917 | n = select(fd+1, NULL, NULL, &fds, &tv); |
918 | gettimeofday(&end, NULL); | |
919 | end.tv_sec -= start.tv_sec; | |
920 | *msec -= (end.tv_sec * 1000 + end.tv_usec/1000 | |
4bffc964 | 921 | - start.tv_usec/1000) + 1; |
efc67e8e N |
922 | } |
923 | return n; | |
924 | } |