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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 | ||
549e9569 NB |
60 | int sysfs_open(int devnum, char *devname, char *attr) |
61 | { | |
62 | char fname[50]; | |
549e9569 | 63 | int fd; |
1e4bc070 | 64 | char *mdname = devnum2devname(devnum); |
549e9569 | 65 | |
1e4bc070 DW |
66 | if (!mdname) |
67 | return -1; | |
68 | ||
69 | sprintf(fname, "/sys/block/%s/md/", mdname); | |
549e9569 NB |
70 | if (devname) { |
71 | strcat(fname, devname); | |
72 | strcat(fname, "/"); | |
73 | } | |
74 | strcat(fname, attr); | |
75 | fd = open(fname, O_RDWR); | |
ea6d09b0 | 76 | if (fd < 0 && errno == EACCES) |
549e9569 | 77 | fd = open(fname, O_RDONLY); |
1e4bc070 | 78 | free(mdname); |
549e9569 NB |
79 | return fd; |
80 | } | |
81 | ||
f35f2525 N |
82 | void sysfs_init(struct mdinfo *mdi, int fd, int devnum) |
83 | { | |
678a4a36 | 84 | mdi->sys_name[0] = 0; |
f35f2525 | 85 | if (fd >= 0) { |
f35f2525 | 86 | mdu_version_t vers; |
f35f2525 N |
87 | if (ioctl(fd, RAID_VERSION, &vers) != 0) |
88 | return; | |
d7ab966b | 89 | devnum = fd2devnum(fd); |
f35f2525 | 90 | } |
d7ab966b N |
91 | if (devnum == NoMdDev) |
92 | return; | |
11877f4d | 93 | fmt_devname(mdi->sys_name, devnum); |
f35f2525 N |
94 | } |
95 | ||
d7ab966b | 96 | |
7e0f6979 | 97 | struct mdinfo *sysfs_read(int fd, int devnum, 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; |
06c7f68e | 104 | struct mdinfo *dev; |
355726fa | 105 | DIR *dir = NULL; |
e86c9dd6 NB |
106 | struct dirent *de; |
107 | ||
108 | sra = malloc(sizeof(*sra)); | |
109 | if (sra == NULL) | |
110 | return sra; | |
f35f2525 N |
111 | memset(sra, 0, sizeof(*sra)); |
112 | sysfs_init(sra, fd, devnum); | |
678a4a36 N |
113 | if (sra->sys_name[0] == 0) { |
114 | free(sra); | |
115 | return NULL; | |
116 | } | |
e86c9dd6 | 117 | |
7e0f6979 | 118 | sprintf(fname, "/sys/block/%s/md/", sra->sys_name); |
e86c9dd6 NB |
119 | base = fname + strlen(fname); |
120 | ||
121 | sra->devs = NULL; | |
8382f19b NB |
122 | if (options & GET_VERSION) { |
123 | strcpy(base, "metadata_version"); | |
124 | if (load_sys(fname, buf)) | |
125 | goto abort; | |
294d6f45 | 126 | if (strncmp(buf, "none", 4) == 0) { |
7e0f6979 NB |
127 | sra->array.major_version = |
128 | sra->array.minor_version = -1; | |
294d6f45 NB |
129 | strcpy(sra->text_version, ""); |
130 | } else if (strncmp(buf, "external:", 9) == 0) { | |
142cb9e1 NB |
131 | sra->array.major_version = -1; |
132 | sra->array.minor_version = -2; | |
133 | strcpy(sra->text_version, buf+9); | |
b8ac1967 | 134 | } else { |
8382f19b | 135 | sscanf(buf, "%d.%d", |
7e0f6979 NB |
136 | &sra->array.major_version, |
137 | &sra->array.minor_version); | |
b8ac1967 NB |
138 | strcpy(sra->text_version, buf); |
139 | } | |
8382f19b | 140 | } |
e86c9dd6 NB |
141 | if (options & GET_LEVEL) { |
142 | strcpy(base, "level"); | |
143 | if (load_sys(fname, buf)) | |
144 | goto abort; | |
7e0f6979 | 145 | sra->array.level = map_name(pers, buf); |
e86c9dd6 NB |
146 | } |
147 | if (options & GET_LAYOUT) { | |
148 | strcpy(base, "layout"); | |
149 | if (load_sys(fname, buf)) | |
150 | goto abort; | |
7e0f6979 | 151 | sra->array.layout = strtoul(buf, NULL, 0); |
e86c9dd6 | 152 | } |
549e9569 NB |
153 | if (options & GET_DISKS) { |
154 | strcpy(base, "raid_disks"); | |
155 | if (load_sys(fname, buf)) | |
156 | goto abort; | |
157 | sra->array.raid_disks = strtoul(buf, NULL, 0); | |
f1d26766 DW |
158 | } |
159 | if (options & GET_DEGRADED) { | |
160 | strcpy(base, "degraded"); | |
161 | if (load_sys(fname, buf)) | |
162 | goto abort; | |
163 | sra->array.failed_disks = strtoul(buf, NULL, 0); | |
549e9569 | 164 | } |
e86c9dd6 NB |
165 | if (options & GET_COMPONENT) { |
166 | strcpy(base, "component_size"); | |
167 | if (load_sys(fname, buf)) | |
168 | goto abort; | |
169 | sra->component_size = strtoull(buf, NULL, 0); | |
353632d9 NB |
170 | /* sysfs reports "K", but we want sectors */ |
171 | sra->component_size *= 2; | |
e86c9dd6 NB |
172 | } |
173 | if (options & GET_CHUNK) { | |
174 | strcpy(base, "chunk_size"); | |
175 | if (load_sys(fname, buf)) | |
176 | goto abort; | |
7e0f6979 | 177 | sra->array.chunk_size = strtoul(buf, NULL, 0); |
e86c9dd6 | 178 | } |
758d3a8e NB |
179 | if (options & GET_CACHE) { |
180 | strcpy(base, "stripe_cache_size"); | |
181 | if (load_sys(fname, buf)) | |
182 | goto abort; | |
183 | sra->cache_size = strtoul(buf, NULL, 0); | |
184 | } | |
37dfc3d6 NB |
185 | if (options & GET_MISMATCH) { |
186 | strcpy(base, "mismatch_cnt"); | |
187 | if (load_sys(fname, buf)) | |
188 | goto abort; | |
189 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
190 | } | |
1770662b DW |
191 | if (options & GET_SAFEMODE) { |
192 | int scale = 1; | |
193 | int dot = 0; | |
f21e18ca | 194 | unsigned i; |
1770662b DW |
195 | unsigned long msec; |
196 | size_t len; | |
197 | ||
198 | strcpy(base, "safe_mode_delay"); | |
199 | if (load_sys(fname, buf)) | |
200 | goto abort; | |
201 | ||
202 | /* remove a period, and count digits after it */ | |
203 | len = strlen(buf); | |
204 | for (i = 0; i < len; i++) { | |
205 | if (dot) { | |
206 | if (isdigit(buf[i])) { | |
207 | buf[i-1] = buf[i]; | |
208 | scale *= 10; | |
209 | } | |
210 | buf[i] = 0; | |
211 | } else if (buf[i] == '.') { | |
212 | dot=1; | |
213 | buf[i] = 0; | |
214 | } | |
215 | } | |
216 | msec = strtoul(buf, NULL, 10); | |
217 | msec = (msec * 1000) / scale; | |
218 | sra->safe_mode_delay = msec; | |
219 | } | |
c0c1acd6 N |
220 | if (options & GET_BITMAP_LOCATION) { |
221 | strcpy(base, "bitmap/location"); | |
222 | if (load_sys(fname, buf)) | |
223 | goto abort; | |
224 | if (strncmp(buf, "file", 4) == 0) | |
225 | sra->bitmap_offset = 1; | |
226 | else if (strncmp(buf, "none", 4) == 0) | |
227 | sra->bitmap_offset = 0; | |
228 | else if (buf[0] == '+') | |
fbdef498 | 229 | sra->bitmap_offset = strtol(buf+1, NULL, 10); |
c0c1acd6 N |
230 | else |
231 | goto abort; | |
232 | } | |
e86c9dd6 NB |
233 | |
234 | if (! (options & GET_DEVS)) | |
235 | return sra; | |
236 | ||
237 | /* Get all the devices as well */ | |
238 | *base = 0; | |
239 | dir = opendir(fname); | |
240 | if (!dir) | |
241 | goto abort; | |
7e0f6979 | 242 | sra->array.spare_disks = 0; |
e86c9dd6 NB |
243 | |
244 | while ((de = readdir(dir)) != NULL) { | |
245 | char *ep; | |
246 | if (de->d_ino == 0 || | |
247 | strncmp(de->d_name, "dev-", 4) != 0) | |
248 | continue; | |
249 | strcpy(base, de->d_name); | |
250 | dbase = base + strlen(base); | |
251 | *dbase++ = '/'; | |
252 | ||
253 | dev = malloc(sizeof(*dev)); | |
254 | if (!dev) | |
255 | goto abort; | |
e86c9dd6 NB |
256 | |
257 | /* Always get slot, major, minor */ | |
258 | strcpy(dbase, "slot"); | |
4795982e DW |
259 | if (load_sys(fname, buf)) { |
260 | /* hmm... unable to read 'slot' maybe the device | |
261 | * is going away? | |
262 | */ | |
263 | strcpy(dbase, "block"); | |
264 | if (readlink(fname, buf, sizeof(buf)) < 0 && | |
265 | errno != ENAMETOOLONG) { | |
266 | /* ...yup device is gone */ | |
267 | free(dev); | |
268 | continue; | |
269 | } else { | |
270 | /* slot is unreadable but 'block' link | |
271 | * still intact... something bad is happening | |
272 | * so abort | |
273 | */ | |
274 | free(dev); | |
275 | goto abort; | |
276 | } | |
277 | ||
278 | } | |
4795982e | 279 | strcpy(dev->sys_name, de->d_name); |
06c7f68e NB |
280 | dev->disk.raid_disk = strtoul(buf, &ep, 10); |
281 | if (*ep) dev->disk.raid_disk = -1; | |
e86c9dd6 NB |
282 | |
283 | strcpy(dbase, "block/dev"); | |
dab4a513 | 284 | if (load_sys(fname, buf)) { |
b526e52d DW |
285 | /* assume this is a stale reference to a hot |
286 | * removed device | |
287 | */ | |
dab4a513 | 288 | free(dev); |
b526e52d | 289 | continue; |
dab4a513 | 290 | } |
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 */ | |
302 | dev->next = sra->devs; | |
303 | sra->devs = dev; | |
304 | ||
e86c9dd6 NB |
305 | if (options & GET_OFFSET) { |
306 | strcpy(dbase, "offset"); | |
307 | if (load_sys(fname, buf)) | |
308 | goto abort; | |
06c7f68e | 309 | dev->data_offset = strtoull(buf, NULL, 0); |
e86c9dd6 NB |
310 | } |
311 | if (options & GET_SIZE) { | |
312 | strcpy(dbase, "size"); | |
313 | if (load_sys(fname, buf)) | |
314 | goto abort; | |
047d2e49 | 315 | dev->component_size = strtoull(buf, NULL, 0) * 2; |
e86c9dd6 NB |
316 | } |
317 | if (options & GET_STATE) { | |
06c7f68e | 318 | dev->disk.state = 0; |
e86c9dd6 NB |
319 | strcpy(dbase, "state"); |
320 | if (load_sys(fname, buf)) | |
321 | goto abort; | |
322 | if (strstr(buf, "in_sync")) | |
06c7f68e | 323 | dev->disk.state |= (1<<MD_DISK_SYNC); |
e86c9dd6 | 324 | if (strstr(buf, "faulty")) |
06c7f68e NB |
325 | dev->disk.state |= (1<<MD_DISK_FAULTY); |
326 | if (dev->disk.state == 0) | |
7e0f6979 | 327 | sra->array.spare_disks++; |
e86c9dd6 NB |
328 | } |
329 | if (options & GET_ERROR) { | |
330 | strcpy(buf, "errors"); | |
331 | if (load_sys(fname, buf)) | |
332 | goto abort; | |
333 | dev->errors = strtoul(buf, NULL, 0); | |
334 | } | |
335 | } | |
355726fa | 336 | closedir(dir); |
e86c9dd6 NB |
337 | return sra; |
338 | ||
339 | abort: | |
355726fa NB |
340 | if (dir) |
341 | closedir(dir); | |
8382f19b | 342 | sysfs_free(sra); |
e86c9dd6 NB |
343 | return NULL; |
344 | } | |
345 | ||
1770662b DW |
346 | int sysfs_attr_match(const char *attr, const char *str) |
347 | { | |
348 | /* See if attr, read from a sysfs file, matches | |
349 | * str. They must either be the same, or attr can | |
350 | * have a trailing newline or comma | |
351 | */ | |
352 | while (*attr && *str && *attr == *str) { | |
353 | attr++; | |
354 | str++; | |
355 | } | |
356 | ||
357 | if (*str || (*attr && *attr != ',' && *attr != '\n')) | |
358 | return 0; | |
359 | return 1; | |
360 | } | |
361 | ||
362 | int sysfs_match_word(const char *word, char **list) | |
363 | { | |
364 | int n; | |
365 | for (n=0; list[n]; n++) | |
366 | if (sysfs_attr_match(word, list[n])) | |
367 | break; | |
368 | return n; | |
369 | } | |
370 | ||
e86c9dd6 NB |
371 | unsigned long long get_component_size(int fd) |
372 | { | |
373 | /* Find out the component size of the array. | |
374 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
375 | * size field is only 32bits. | |
376 | * So look in /sys/block/mdXXX/md/component_size | |
353632d9 | 377 | * |
8686f3ed | 378 | * This returns in units of sectors. |
e86c9dd6 NB |
379 | */ |
380 | struct stat stb; | |
381 | char fname[50]; | |
382 | int n; | |
383 | if (fstat(fd, &stb)) return 0; | |
f21e18ca | 384 | if (major(stb.st_rdev) != (unsigned)get_mdp_major()) |
e86c9dd6 | 385 | sprintf(fname, "/sys/block/md%d/md/component_size", |
ea24acd0 | 386 | (int)minor(stb.st_rdev)); |
e86c9dd6 NB |
387 | else |
388 | sprintf(fname, "/sys/block/md_d%d/md/component_size", | |
ea24acd0 | 389 | (int)minor(stb.st_rdev)>>MdpMinorShift); |
e86c9dd6 NB |
390 | fd = open(fname, O_RDONLY); |
391 | if (fd < 0) | |
392 | return 0; | |
393 | n = read(fd, fname, sizeof(fname)); | |
394 | close(fd); | |
99f6e521 | 395 | if (n < 0 || n == sizeof(fname)) |
e86c9dd6 NB |
396 | return 0; |
397 | fname[n] = 0; | |
8686f3ed | 398 | return strtoull(fname, NULL, 10) * 2; |
e86c9dd6 NB |
399 | } |
400 | ||
7e0f6979 | 401 | int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
402 | char *name, char *val) |
403 | { | |
404 | char fname[50]; | |
f21e18ca | 405 | unsigned int n; |
e86c9dd6 | 406 | int fd; |
7e1432fb | 407 | |
e86c9dd6 | 408 | sprintf(fname, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 409 | sra->sys_name, dev?dev->sys_name:"", name); |
e86c9dd6 NB |
410 | fd = open(fname, O_WRONLY); |
411 | if (fd < 0) | |
412 | return -1; | |
413 | n = write(fd, val, strlen(val)); | |
414 | close(fd); | |
2a24d7b6 DW |
415 | if (n != strlen(val)) { |
416 | dprintf(Name ": failed to write '%s' to '%s' (%s)\n", | |
417 | val, fname, strerror(errno)); | |
e86c9dd6 | 418 | return -1; |
2a24d7b6 | 419 | } |
e86c9dd6 NB |
420 | return 0; |
421 | } | |
422 | ||
7e0f6979 | 423 | int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev, |
e86c9dd6 NB |
424 | char *name, unsigned long long val) |
425 | { | |
426 | char valstr[50]; | |
427 | sprintf(valstr, "%llu", val); | |
428 | return sysfs_set_str(sra, dev, name, valstr); | |
429 | } | |
430 | ||
97590376 N |
431 | int sysfs_uevent(struct mdinfo *sra, char *event) |
432 | { | |
433 | char fname[50]; | |
434 | int n; | |
435 | int fd; | |
436 | ||
437 | sprintf(fname, "/sys/block/%s/uevent", | |
438 | sra->sys_name); | |
439 | fd = open(fname, O_WRONLY); | |
440 | if (fd < 0) | |
441 | return -1; | |
442 | n = write(fd, event, strlen(event)); | |
443 | close(fd); | |
e4c72d1d LB |
444 | if (n != (int)strlen(event)) { |
445 | dprintf(Name ": failed to write '%s' to '%s' (%s)\n", | |
446 | event, fname, strerror(errno)); | |
447 | return -1; | |
448 | } | |
97590376 N |
449 | return 0; |
450 | } | |
451 | ||
bc77ed53 DW |
452 | int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name) |
453 | { | |
454 | char fname[50]; | |
455 | struct stat st; | |
456 | ||
457 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
458 | sra->sys_name, dev?dev->sys_name:"", name); | |
459 | ||
460 | return stat(fname, &st) == 0; | |
461 | } | |
462 | ||
a6288483 N |
463 | int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev, |
464 | char *name) | |
e86c9dd6 NB |
465 | { |
466 | char fname[50]; | |
e86c9dd6 | 467 | int fd; |
a6288483 | 468 | |
e86c9dd6 | 469 | sprintf(fname, "/sys/block/%s/md/%s/%s", |
7e0f6979 | 470 | sra->sys_name, dev?dev->sys_name:"", name); |
a6288483 | 471 | fd = open(fname, O_RDWR); |
e86c9dd6 | 472 | if (fd < 0) |
a6288483 N |
473 | fd = open(fname, O_RDONLY); |
474 | return fd; | |
475 | } | |
476 | ||
477 | int sysfs_fd_get_ll(int fd, unsigned long long *val) | |
478 | { | |
479 | char buf[50]; | |
480 | int n; | |
481 | char *ep; | |
482 | ||
483 | lseek(fd, 0, 0); | |
e86c9dd6 | 484 | n = read(fd, buf, sizeof(buf)); |
e86c9dd6 | 485 | if (n <= 0) |
6560987b | 486 | return -2; |
e86c9dd6 NB |
487 | buf[n] = 0; |
488 | *val = strtoull(buf, &ep, 0); | |
489 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
490 | return -1; | |
491 | return 0; | |
492 | } | |
2503d23b | 493 | |
a6288483 N |
494 | int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev, |
495 | char *name, unsigned long long *val) | |
496 | { | |
497 | int n; | |
498 | int fd; | |
499 | ||
500 | fd = sysfs_get_fd(sra, dev, name); | |
501 | if (fd < 0) | |
502 | return -1; | |
503 | n = sysfs_fd_get_ll(fd, val); | |
504 | close(fd); | |
505 | return n; | |
506 | } | |
507 | ||
7236ee7a N |
508 | int sysfs_fd_get_str(int fd, char *val, int size) |
509 | { | |
510 | int n; | |
511 | ||
512 | lseek(fd, 0, 0); | |
513 | n = read(fd, val, size); | |
514 | if (n <= 0) | |
515 | return -1; | |
516 | val[n] = 0; | |
517 | return n; | |
518 | } | |
519 | ||
93ecfa01 N |
520 | int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev, |
521 | char *name, char *val, int size) | |
522 | { | |
93ecfa01 N |
523 | int n; |
524 | int fd; | |
7236ee7a N |
525 | |
526 | fd = sysfs_get_fd(sra, dev, name); | |
93ecfa01 N |
527 | if (fd < 0) |
528 | return -1; | |
7236ee7a | 529 | n = sysfs_fd_get_str(fd, val, size); |
93ecfa01 | 530 | close(fd); |
93ecfa01 N |
531 | return n; |
532 | } | |
533 | ||
8ed3e5e1 DW |
534 | int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms) |
535 | { | |
536 | unsigned long sec; | |
537 | unsigned long msec; | |
538 | char delay[30]; | |
539 | ||
540 | sec = ms / 1000; | |
0dd3ba30 | 541 | msec = ms % 1000; |
8ed3e5e1 | 542 | |
0dd3ba30 DW |
543 | sprintf(delay, "%ld.%03ld\n", sec, msec); |
544 | /* this '\n' ^ needed for kernels older than 2.6.28 */ | |
8ed3e5e1 DW |
545 | return sysfs_set_str(sra, NULL, "safe_mode_delay", delay); |
546 | } | |
547 | ||
f35f2525 | 548 | int sysfs_set_array(struct mdinfo *info, int vers) |
2503d23b NB |
549 | { |
550 | int rv = 0; | |
f35f2525 | 551 | char ver[100]; |
a5062b1c | 552 | int raid_disks = info->array.raid_disks; |
f35f2525 N |
553 | |
554 | ver[0] = 0; | |
555 | if (info->array.major_version == -1 && | |
556 | info->array.minor_version == -2) { | |
ddb12f6c AK |
557 | char buf[1024]; |
558 | ||
f35f2525 N |
559 | strcat(strcpy(ver, "external:"), info->text_version); |
560 | ||
ddb12f6c AK |
561 | /* meta version might already be set if we are setting |
562 | * new geometry for a reshape. In that case we don't | |
563 | * want to over-write the 'readonly' flag that is | |
564 | * stored in the metadata version. So read the current | |
565 | * version first, and preserve the flag | |
566 | */ | |
567 | if (sysfs_get_str(info, NULL, "metadata_version", | |
568 | buf, 1024) > 0) | |
569 | if (strlen(buf) >= 9 && buf[9] == '-') | |
570 | ver[9] = '-'; | |
571 | ||
f35f2525 N |
572 | if ((vers % 100) < 2 || |
573 | sysfs_set_str(info, NULL, "metadata_version", | |
574 | ver) < 0) { | |
575 | fprintf(stderr, Name ": This kernel does not " | |
576 | "support external metadata.\n"); | |
577 | return 1; | |
578 | } | |
579 | } | |
2503d23b NB |
580 | if (info->array.level < 0) |
581 | return 0; /* FIXME */ | |
f35f2525 | 582 | rv |= sysfs_set_str(info, NULL, "level", |
2503d23b | 583 | map_num(pers, info->array.level)); |
a5062b1c AK |
584 | if (info->reshape_active && info->delta_disks != UnSet) |
585 | raid_disks -= info->delta_disks; | |
586 | rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks); | |
f35f2525 N |
587 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size); |
588 | rv |= sysfs_set_num(info, NULL, "layout", info->array.layout); | |
589 | rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2); | |
da9b4a62 DW |
590 | if (info->custom_array_size) { |
591 | int rc; | |
592 | ||
593 | rc = sysfs_set_num(info, NULL, "array_size", | |
594 | info->custom_array_size/2); | |
595 | if (rc && errno == ENOENT) { | |
596 | fprintf(stderr, Name ": This kernel does not " | |
597 | "have the md/array_size attribute, " | |
598 | "the array may be larger than expected\n"); | |
599 | rc = 0; | |
600 | } | |
601 | rv |= rc; | |
602 | } | |
603 | ||
f35f2525 N |
604 | if (info->array.level > 0) |
605 | rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start); | |
f897078e N |
606 | |
607 | if (info->reshape_active) { | |
608 | rv |= sysfs_set_num(info, NULL, "reshape_position", | |
609 | info->reshape_progress); | |
610 | rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk); | |
20a40eca N |
611 | rv |= sysfs_set_num(info, NULL, "layout", info->new_layout); |
612 | rv |= sysfs_set_num(info, NULL, "raid_disks", | |
a5062b1c | 613 | info->array.raid_disks); |
20a40eca N |
614 | /* We don't set 'new_level' here. That can only happen |
615 | * once the reshape completes. | |
f897078e N |
616 | */ |
617 | } | |
2503d23b NB |
618 | return rv; |
619 | } | |
620 | ||
2904b26f | 621 | int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume) |
2503d23b | 622 | { |
33a6535d AW |
623 | char dv[PATH_MAX]; |
624 | char nm[PATH_MAX]; | |
2503d23b NB |
625 | char *dname; |
626 | int rv; | |
627 | ||
628 | sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor); | |
629 | rv = sysfs_set_str(sra, NULL, "new_dev", dv); | |
630 | if (rv) | |
631 | return rv; | |
632 | ||
633 | memset(nm, 0, sizeof(nm)); | |
634 | sprintf(dv, "/sys/dev/block/%d:%d", sd->disk.major, sd->disk.minor); | |
9cf014ec | 635 | rv = readlink(dv, nm, sizeof(nm)-1); |
73649188 | 636 | if (rv <= 0) |
2503d23b | 637 | return -1; |
73649188 | 638 | nm[rv] = '\0'; |
2503d23b NB |
639 | dname = strrchr(nm, '/'); |
640 | if (dname) dname++; | |
641 | strcpy(sd->sys_name, "dev-"); | |
642 | strcpy(sd->sys_name+4, dname); | |
643 | ||
2904b26f DW |
644 | /* test write to see if 'recovery_start' is available */ |
645 | if (resume && sd->recovery_start < MaxSector && | |
646 | sysfs_set_num(sra, sd, "recovery_start", 0)) { | |
647 | sysfs_set_str(sra, sd, "state", "remove"); | |
648 | return -1; | |
649 | } | |
650 | ||
73649188 | 651 | rv = sysfs_set_num(sra, sd, "offset", sd->data_offset); |
2503d23b NB |
652 | rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2); |
653 | if (sra->array.level != LEVEL_CONTAINER) { | |
d23534e4 | 654 | if (sd->recovery_start == MaxSector) |
462906cd N |
655 | /* This can correctly fail if array isn't started, |
656 | * yet, so just ignore status for now. | |
657 | */ | |
d23534e4 | 658 | sysfs_set_str(sra, sd, "state", "insync"); |
899aead0 AK |
659 | if (sd->disk.raid_disk >= 0) |
660 | rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk); | |
2904b26f DW |
661 | if (resume) |
662 | sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start); | |
2503d23b | 663 | } |
2503d23b NB |
664 | return rv; |
665 | } | |
90c8b707 | 666 | |
755c99fa | 667 | #if 0 |
90c8b707 DW |
668 | int sysfs_disk_to_sg(int fd) |
669 | { | |
670 | /* from an open block device, try find and open its corresponding | |
671 | * scsi_generic interface | |
672 | */ | |
673 | struct stat st; | |
674 | char path[256]; | |
675 | char sg_path[256]; | |
676 | char sg_major_minor[8]; | |
677 | char *c; | |
678 | DIR *dir; | |
679 | struct dirent *de; | |
680 | int major, minor, rv; | |
681 | ||
682 | if (fstat(fd, &st)) | |
683 | return -1; | |
684 | ||
685 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device", | |
686 | major(st.st_rdev), minor(st.st_rdev)); | |
687 | ||
688 | dir = opendir(path); | |
689 | if (!dir) | |
690 | return -1; | |
691 | ||
692 | de = readdir(dir); | |
693 | while (de) { | |
694 | if (strncmp("scsi_generic:", de->d_name, | |
695 | strlen("scsi_generic:")) == 0) | |
696 | break; | |
697 | de = readdir(dir); | |
698 | } | |
699 | closedir(dir); | |
700 | ||
701 | if (!de) | |
702 | return -1; | |
703 | ||
704 | snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name); | |
705 | fd = open(sg_path, O_RDONLY); | |
706 | if (fd < 0) | |
707 | return fd; | |
708 | ||
709 | rv = read(fd, sg_major_minor, sizeof(sg_major_minor)); | |
710 | close(fd); | |
711 | if (rv < 0) | |
712 | return -1; | |
713 | else | |
714 | sg_major_minor[rv - 1] = '\0'; | |
715 | ||
716 | c = strchr(sg_major_minor, ':'); | |
717 | *c = '\0'; | |
718 | c++; | |
719 | major = strtol(sg_major_minor, NULL, 10); | |
720 | minor = strtol(c, NULL, 10); | |
721 | snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d", | |
722 | (int) getpid(), major, minor); | |
723 | if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) { | |
724 | fd = open(path, O_RDONLY); | |
725 | unlink(path); | |
726 | return fd; | |
727 | } | |
728 | ||
729 | return -1; | |
730 | } | |
755c99fa | 731 | #endif |
90c8b707 | 732 | |
f1665f72 DW |
733 | int sysfs_disk_to_scsi_id(int fd, __u32 *id) |
734 | { | |
735 | /* from an open block device, try to retrieve it scsi_id */ | |
736 | struct stat st; | |
737 | char path[256]; | |
f1665f72 DW |
738 | DIR *dir; |
739 | struct dirent *de; | |
d8924477 | 740 | int host, bus, target, lun; |
f1665f72 DW |
741 | |
742 | if (fstat(fd, &st)) | |
743 | return 1; | |
744 | ||
fa89bdee | 745 | snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device", |
f1665f72 DW |
746 | major(st.st_rdev), minor(st.st_rdev)); |
747 | ||
748 | dir = opendir(path); | |
749 | if (!dir) | |
750 | return 1; | |
751 | ||
d8924477 DW |
752 | for (de = readdir(dir); de; de = readdir(dir)) { |
753 | int count; | |
754 | ||
755 | if (de->d_type != DT_DIR) | |
756 | continue; | |
757 | ||
758 | count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun); | |
759 | if (count == 4) | |
f1665f72 | 760 | break; |
f1665f72 DW |
761 | } |
762 | closedir(dir); | |
763 | ||
764 | if (!de) | |
765 | return 1; | |
766 | ||
d8924477 | 767 | *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0); |
f1665f72 DW |
768 | return 0; |
769 | } | |
f94d52f4 NB |
770 | |
771 | ||
772 | int sysfs_unique_holder(int devnum, long rdev) | |
773 | { | |
774 | /* Check that devnum is a holder of rdev, | |
775 | * and is the only holder. | |
776 | * we should be locked against races by | |
777 | * an O_EXCL on devnum | |
778 | */ | |
779 | DIR *dir; | |
780 | struct dirent *de; | |
781 | char dirname[100]; | |
782 | char l; | |
783 | int found = 0; | |
784 | sprintf(dirname, "/sys/dev/block/%d:%d/holders", | |
785 | major(rdev), minor(rdev)); | |
786 | dir = opendir(dirname); | |
787 | errno = ENOENT; | |
788 | if (!dir) | |
789 | return 0; | |
790 | l = strlen(dirname); | |
791 | while ((de = readdir(dir)) != NULL) { | |
792 | char buf[10]; | |
793 | int n; | |
794 | int mj, mn; | |
795 | char c; | |
796 | int fd; | |
797 | ||
798 | if (de->d_ino == 0) | |
799 | continue; | |
800 | if (de->d_name[0] == '.') | |
801 | continue; | |
802 | strcpy(dirname+l, "/"); | |
803 | strcat(dirname+l, de->d_name); | |
804 | strcat(dirname+l, "/dev"); | |
805 | fd = open(dirname, O_RDONLY); | |
806 | if (fd < 0) { | |
807 | errno = ENOENT; | |
808 | break; | |
809 | } | |
810 | n = read(fd, buf, sizeof(buf)-1); | |
811 | close(fd); | |
93f1df33 JS |
812 | if (n < 0) |
813 | continue; | |
f94d52f4 NB |
814 | buf[n] = 0; |
815 | if (sscanf(buf, "%d:%d%c", &mj, &mn, &c) != 3 || | |
816 | c != '\n') { | |
817 | errno = ENOENT; | |
818 | break; | |
819 | } | |
820 | if (mj != MD_MAJOR) | |
821 | mn = -1-(mn>>6); | |
822 | ||
823 | if (devnum != mn) { | |
824 | errno = EEXIST; | |
825 | break; | |
826 | } | |
827 | found = 1; | |
828 | } | |
829 | closedir(dir); | |
830 | if (de) | |
831 | return 0; | |
832 | else | |
833 | return found; | |
834 | } | |
38a07ed6 | 835 | |
bc77ed53 DW |
836 | int sysfs_freeze_array(struct mdinfo *sra) |
837 | { | |
838 | /* Try to freeze resync/rebuild on this array/container. | |
839 | * Return -1 if the array is busy, | |
bc77ed53 DW |
840 | * return 0 if this kernel doesn't support 'frozen' |
841 | * return 1 if it worked. | |
842 | */ | |
843 | char buf[20]; | |
844 | ||
845 | if (!sysfs_attribute_available(sra, NULL, "sync_action")) | |
846 | return 1; /* no sync_action == frozen */ | |
847 | if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0) | |
848 | return 0; | |
fd324b08 N |
849 | if (strcmp(buf, "frozen\n") == 0) |
850 | /* Already frozen */ | |
851 | return 0; | |
852 | if (strcmp(buf, "idle\n") != 0) | |
bc77ed53 DW |
853 | return -1; |
854 | if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0) | |
855 | return 0; | |
856 | return 1; | |
857 | } |