sysfs: Avoid if and return on the same line
[thirdparty/mdadm.git] / sysfs.c
CommitLineData
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
193b6c0b 30int load_sys(char *path, char *buf, int len)
e86c9dd6
NB
31{
32 int fd = open(path, O_RDONLY);
33 int n;
34 if (fd < 0)
35 return -1;
193b6c0b 36 n = read(fd, buf, len);
e86c9dd6 37 close(fd);
193b6c0b 38 if (n <0 || n >= len)
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 46void 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 60int 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
77void 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 83void 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 97struct 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");
193b6c0b 121 if (load_sys(fname, buf, sizeof(buf)))
8382f19b 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");
193b6c0b 140 if (load_sys(fname, buf, sizeof(buf)))
e86c9dd6 141 goto abort;
7e0f6979 142 sra->array.level = map_name(pers, buf);
e86c9dd6
NB
143 }
144 if (options & GET_LAYOUT) {
145 strcpy(base, "layout");
193b6c0b 146 if (load_sys(fname, buf, sizeof(buf)))
e86c9dd6 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");
193b6c0b 152 if (load_sys(fname, buf, sizeof(buf)))
549e9569
NB
153 goto abort;
154 sra->array.raid_disks = strtoul(buf, NULL, 0);
f1d26766
DW
155 }
156 if (options & GET_DEGRADED) {
157 strcpy(base, "degraded");
193b6c0b 158 if (load_sys(fname, buf, sizeof(buf)))
f1d26766
DW
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");
193b6c0b 164 if (load_sys(fname, buf, sizeof(buf)))
e86c9dd6
NB
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");
193b6c0b 172 if (load_sys(fname, buf, sizeof(buf)))
e86c9dd6 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");
193b6c0b 178 if (load_sys(fname, buf, sizeof(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");
193b6c0b 186 if (load_sys(fname, buf, sizeof(buf)))
37dfc3d6
NB
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");
193b6c0b 198 if (load_sys(fname, buf, sizeof(buf)))
1770662b
DW
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");
193b6c0b 221 if (load_sys(fname, buf, sizeof(buf)))
c0c1acd6
N
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 232
5aa644c6
SL
233 if (options & GET_ARRAY_STATE) {
234 strcpy(base, "array_state");
193b6c0b
JS
235 if (load_sys(fname, sra->sysfs_array_state,
236 sizeof(sra->sysfs_array_state)))
5aa644c6
SL
237 goto abort;
238 } else
239 sra->sysfs_array_state[0] = 0;
240
e86c9dd6
NB
241 if (! (options & GET_DEVS))
242 return sra;
243
244 /* Get all the devices as well */
245 *base = 0;
246 dir = opendir(fname);
247 if (!dir)
248 goto abort;
7e0f6979 249 sra->array.spare_disks = 0;
e86c9dd6 250
64e103fe
N
251 devp = &sra->devs;
252 sra->devs = NULL;
e86c9dd6
NB
253 while ((de = readdir(dir)) != NULL) {
254 char *ep;
255 if (de->d_ino == 0 ||
256 strncmp(de->d_name, "dev-", 4) != 0)
257 continue;
258 strcpy(base, de->d_name);
259 dbase = base + strlen(base);
260 *dbase++ = '/';
261
503975b9 262 dev = xmalloc(sizeof(*dev));
e86c9dd6
NB
263
264 /* Always get slot, major, minor */
265 strcpy(dbase, "slot");
193b6c0b 266 if (load_sys(fname, buf, sizeof(buf))) {
4795982e
DW
267 /* hmm... unable to read 'slot' maybe the device
268 * is going away?
269 */
270 strcpy(dbase, "block");
271 if (readlink(fname, buf, sizeof(buf)) < 0 &&
272 errno != ENAMETOOLONG) {
273 /* ...yup device is gone */
274 free(dev);
275 continue;
276 } else {
277 /* slot is unreadable but 'block' link
278 * still intact... something bad is happening
279 * so abort
280 */
281 free(dev);
282 goto abort;
283 }
64e103fe 284
4795982e 285 }
4795982e 286 strcpy(dev->sys_name, de->d_name);
06c7f68e
NB
287 dev->disk.raid_disk = strtoul(buf, &ep, 10);
288 if (*ep) dev->disk.raid_disk = -1;
e86c9dd6
NB
289
290 strcpy(dbase, "block/dev");
193b6c0b 291 if (load_sys(fname, buf, sizeof(buf))) {
b526e52d
DW
292 /* assume this is a stale reference to a hot
293 * removed device
294 */
dab4a513 295 free(dev);
b526e52d 296 continue;
dab4a513 297 }
e6fc80a8 298 sra->array.nr_disks++;
06c7f68e 299 sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
e86c9dd6 300
dab4a513 301 /* special case check for block devices that can go 'offline' */
b526e52d 302 strcpy(dbase, "block/device/state");
193b6c0b 303 if (load_sys(fname, buf, sizeof(buf)) == 0 &&
b526e52d
DW
304 strncmp(buf, "offline", 7) == 0) {
305 free(dev);
306 continue;
dab4a513
DW
307 }
308
309 /* finally add this disk to the array */
64e103fe
N
310 *devp = dev;
311 devp = & dev->next;
312 dev->next = NULL;
dab4a513 313
e86c9dd6
NB
314 if (options & GET_OFFSET) {
315 strcpy(dbase, "offset");
193b6c0b 316 if (load_sys(fname, buf, sizeof(buf)))
e86c9dd6 317 goto abort;
06c7f68e 318 dev->data_offset = strtoull(buf, NULL, 0);
fe384ca0 319 strcpy(dbase, "new_offset");
193b6c0b 320 if (load_sys(fname, buf, sizeof(buf)) == 0)
fe384ca0
N
321 dev->new_data_offset = strtoull(buf, NULL, 0);
322 else
323 dev->new_data_offset = dev->data_offset;
e86c9dd6
NB
324 }
325 if (options & GET_SIZE) {
326 strcpy(dbase, "size");
193b6c0b 327 if (load_sys(fname, buf, sizeof(buf)))
e86c9dd6 328 goto abort;
047d2e49 329 dev->component_size = strtoull(buf, NULL, 0) * 2;
e86c9dd6
NB
330 }
331 if (options & GET_STATE) {
06c7f68e 332 dev->disk.state = 0;
e86c9dd6 333 strcpy(dbase, "state");
193b6c0b 334 if (load_sys(fname, buf, sizeof(buf)))
e86c9dd6
NB
335 goto abort;
336 if (strstr(buf, "in_sync"))
06c7f68e 337 dev->disk.state |= (1<<MD_DISK_SYNC);
e86c9dd6 338 if (strstr(buf, "faulty"))
06c7f68e
NB
339 dev->disk.state |= (1<<MD_DISK_FAULTY);
340 if (dev->disk.state == 0)
7e0f6979 341 sra->array.spare_disks++;
e86c9dd6
NB
342 }
343 if (options & GET_ERROR) {
344 strcpy(buf, "errors");
193b6c0b 345 if (load_sys(fname, buf, sizeof(buf)))
e86c9dd6
NB
346 goto abort;
347 dev->errors = strtoul(buf, NULL, 0);
348 }
349 }
355726fa 350 closedir(dir);
e86c9dd6
NB
351 return sra;
352
353 abort:
355726fa
NB
354 if (dir)
355 closedir(dir);
8382f19b 356 sysfs_free(sra);
e86c9dd6
NB
357 return NULL;
358}
359
1770662b
DW
360int sysfs_attr_match(const char *attr, const char *str)
361{
362 /* See if attr, read from a sysfs file, matches
363 * str. They must either be the same, or attr can
364 * have a trailing newline or comma
365 */
366 while (*attr && *str && *attr == *str) {
367 attr++;
368 str++;
369 }
370
371 if (*str || (*attr && *attr != ',' && *attr != '\n'))
372 return 0;
373 return 1;
374}
375
376int sysfs_match_word(const char *word, char **list)
377{
378 int n;
379 for (n=0; list[n]; n++)
380 if (sysfs_attr_match(word, list[n]))
381 break;
382 return n;
383}
384
e86c9dd6
NB
385unsigned long long get_component_size(int fd)
386{
387 /* Find out the component size of the array.
388 * We cannot trust GET_ARRAY_INFO ioctl as it's
389 * size field is only 32bits.
390 * So look in /sys/block/mdXXX/md/component_size
353632d9 391 *
8686f3ed 392 * This returns in units of sectors.
e86c9dd6
NB
393 */
394 struct stat stb;
395 char fname[50];
396 int n;
36138e4e
JS
397 if (fstat(fd, &stb))
398 return 0;
f21e18ca 399 if (major(stb.st_rdev) != (unsigned)get_mdp_major())
e86c9dd6 400 sprintf(fname, "/sys/block/md%d/md/component_size",
ea24acd0 401 (int)minor(stb.st_rdev));
e86c9dd6
NB
402 else
403 sprintf(fname, "/sys/block/md_d%d/md/component_size",
ea24acd0 404 (int)minor(stb.st_rdev)>>MdpMinorShift);
e86c9dd6
NB
405 fd = open(fname, O_RDONLY);
406 if (fd < 0)
407 return 0;
408 n = read(fd, fname, sizeof(fname));
409 close(fd);
99f6e521 410 if (n < 0 || n == sizeof(fname))
e86c9dd6
NB
411 return 0;
412 fname[n] = 0;
8686f3ed 413 return strtoull(fname, NULL, 10) * 2;
e86c9dd6
NB
414}
415
7e0f6979 416int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
e86c9dd6
NB
417 char *name, char *val)
418{
419 char fname[50];
f21e18ca 420 unsigned int n;
e86c9dd6 421 int fd;
7e1432fb 422
e86c9dd6 423 sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979 424 sra->sys_name, dev?dev->sys_name:"", name);
e86c9dd6
NB
425 fd = open(fname, O_WRONLY);
426 if (fd < 0)
427 return -1;
428 n = write(fd, val, strlen(val));
429 close(fd);
2a24d7b6 430 if (n != strlen(val)) {
1ade5cc1
N
431 dprintf("failed to write '%s' to '%s' (%s)\n",
432 val, fname, strerror(errno));
e86c9dd6 433 return -1;
2a24d7b6 434 }
e86c9dd6
NB
435 return 0;
436}
437
7e0f6979 438int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
e86c9dd6
NB
439 char *name, unsigned long long val)
440{
441 char valstr[50];
442 sprintf(valstr, "%llu", val);
443 return sysfs_set_str(sra, dev, name, valstr);
444}
445
012a8641
JS
446int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev,
447 char *name, long long val)
448{
449 char valstr[50];
450 sprintf(valstr, "%lli", val);
451 return sysfs_set_str(sra, dev, name, valstr);
452}
453
97590376
N
454int sysfs_uevent(struct mdinfo *sra, char *event)
455{
456 char fname[50];
457 int n;
458 int fd;
459
460 sprintf(fname, "/sys/block/%s/uevent",
461 sra->sys_name);
462 fd = open(fname, O_WRONLY);
463 if (fd < 0)
464 return -1;
465 n = write(fd, event, strlen(event));
466 close(fd);
e4c72d1d 467 if (n != (int)strlen(event)) {
1ade5cc1
N
468 dprintf("failed to write '%s' to '%s' (%s)\n",
469 event, fname, strerror(errno));
e4c72d1d
LB
470 return -1;
471 }
97590376 472 return 0;
1011e834 473}
97590376 474
bc77ed53
DW
475int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name)
476{
477 char fname[50];
478 struct stat st;
479
480 sprintf(fname, "/sys/block/%s/md/%s/%s",
481 sra->sys_name, dev?dev->sys_name:"", name);
482
483 return stat(fname, &st) == 0;
484}
485
a6288483
N
486int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev,
487 char *name)
e86c9dd6
NB
488{
489 char fname[50];
e86c9dd6 490 int fd;
a6288483 491
e86c9dd6 492 sprintf(fname, "/sys/block/%s/md/%s/%s",
7e0f6979 493 sra->sys_name, dev?dev->sys_name:"", name);
a6288483 494 fd = open(fname, O_RDWR);
e86c9dd6 495 if (fd < 0)
a6288483
N
496 fd = open(fname, O_RDONLY);
497 return fd;
498}
499
500int sysfs_fd_get_ll(int fd, unsigned long long *val)
501{
502 char buf[50];
503 int n;
504 char *ep;
505
506 lseek(fd, 0, 0);
e86c9dd6 507 n = read(fd, buf, sizeof(buf));
5418499a 508 if (n <= 0 || n == sizeof(buf))
6560987b 509 return -2;
e86c9dd6
NB
510 buf[n] = 0;
511 *val = strtoull(buf, &ep, 0);
512 if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
513 return -1;
514 return 0;
515}
2503d23b 516
a6288483
N
517int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
518 char *name, unsigned long long *val)
519{
520 int n;
521 int fd;
522
523 fd = sysfs_get_fd(sra, dev, name);
524 if (fd < 0)
525 return -1;
526 n = sysfs_fd_get_ll(fd, val);
527 close(fd);
528 return n;
529}
530
2eba8496
N
531int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2)
532{
533 /* two numbers in this sysfs file, either
534 * NNN (NNN)
535 * or
536 * NNN / NNN
537 */
538 char buf[80];
539 int n;
540 char *ep, *ep2;
541
542 lseek(fd, 0, 0);
543 n = read(fd, buf, sizeof(buf));
5418499a 544 if (n <= 0 || n == sizeof(buf))
2eba8496
N
545 return -2;
546 buf[n] = 0;
547 *v1 = strtoull(buf, &ep, 0);
548 if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
549 return -1;
550 while (*ep == ' ' || *ep == '/' || *ep == '(')
551 ep++;
552 *v2 = strtoull(ep, &ep2, 0);
553 if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) {
554 *v2 = *v1;
555 return 1;
556 }
557 return 2;
558}
559
560int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev,
561 char *name, unsigned long long *v1, unsigned long long *v2)
562{
563 int n;
564 int fd;
565
566 fd = sysfs_get_fd(sra, dev, name);
567 if (fd < 0)
568 return -1;
569 n = sysfs_fd_get_two(fd, v1, v2);
570 close(fd);
571 return n;
572}
573
7236ee7a
N
574int sysfs_fd_get_str(int fd, char *val, int size)
575{
576 int n;
577
578 lseek(fd, 0, 0);
579 n = read(fd, val, size);
5418499a 580 if (n <= 0 || n == size)
7236ee7a
N
581 return -1;
582 val[n] = 0;
583 return n;
584}
585
93ecfa01
N
586int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev,
587 char *name, char *val, int size)
588{
93ecfa01
N
589 int n;
590 int fd;
7236ee7a
N
591
592 fd = sysfs_get_fd(sra, dev, name);
93ecfa01
N
593 if (fd < 0)
594 return -1;
7236ee7a 595 n = sysfs_fd_get_str(fd, val, size);
93ecfa01 596 close(fd);
93ecfa01
N
597 return n;
598}
599
8ed3e5e1
DW
600int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms)
601{
602 unsigned long sec;
603 unsigned long msec;
604 char delay[30];
605
606 sec = ms / 1000;
0dd3ba30 607 msec = ms % 1000;
8ed3e5e1 608
0dd3ba30
DW
609 sprintf(delay, "%ld.%03ld\n", sec, msec);
610 /* this '\n' ^ needed for kernels older than 2.6.28 */
8ed3e5e1
DW
611 return sysfs_set_str(sra, NULL, "safe_mode_delay", delay);
612}
613
f35f2525 614int sysfs_set_array(struct mdinfo *info, int vers)
2503d23b
NB
615{
616 int rv = 0;
f35f2525 617 char ver[100];
a5062b1c 618 int raid_disks = info->array.raid_disks;
f35f2525
N
619
620 ver[0] = 0;
621 if (info->array.major_version == -1 &&
622 info->array.minor_version == -2) {
ddb12f6c
AK
623 char buf[1024];
624
f35f2525
N
625 strcat(strcpy(ver, "external:"), info->text_version);
626
ddb12f6c
AK
627 /* meta version might already be set if we are setting
628 * new geometry for a reshape. In that case we don't
629 * want to over-write the 'readonly' flag that is
630 * stored in the metadata version. So read the current
631 * version first, and preserve the flag
632 */
633 if (sysfs_get_str(info, NULL, "metadata_version",
634 buf, 1024) > 0)
635 if (strlen(buf) >= 9 && buf[9] == '-')
636 ver[9] = '-';
637
f35f2525
N
638 if ((vers % 100) < 2 ||
639 sysfs_set_str(info, NULL, "metadata_version",
640 ver) < 0) {
7a862a02 641 pr_err("This kernel does not support external metadata.\n");
f35f2525
N
642 return 1;
643 }
644 }
2503d23b
NB
645 if (info->array.level < 0)
646 return 0; /* FIXME */
f35f2525 647 rv |= sysfs_set_str(info, NULL, "level",
2503d23b 648 map_num(pers, info->array.level));
a5062b1c
AK
649 if (info->reshape_active && info->delta_disks != UnSet)
650 raid_disks -= info->delta_disks;
651 rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks);
f35f2525
N
652 rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size);
653 rv |= sysfs_set_num(info, NULL, "layout", info->array.layout);
654 rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2);
da9b4a62
DW
655 if (info->custom_array_size) {
656 int rc;
657
658 rc = sysfs_set_num(info, NULL, "array_size",
659 info->custom_array_size/2);
660 if (rc && errno == ENOENT) {
7a862a02 661 pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n");
da9b4a62
DW
662 rc = 0;
663 }
664 rv |= rc;
665 }
666
f35f2525
N
667 if (info->array.level > 0)
668 rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start);
f897078e
N
669
670 if (info->reshape_active) {
671 rv |= sysfs_set_num(info, NULL, "reshape_position",
672 info->reshape_progress);
673 rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk);
20a40eca
N
674 rv |= sysfs_set_num(info, NULL, "layout", info->new_layout);
675 rv |= sysfs_set_num(info, NULL, "raid_disks",
a5062b1c 676 info->array.raid_disks);
20a40eca
N
677 /* We don't set 'new_level' here. That can only happen
678 * once the reshape completes.
f897078e
N
679 */
680 }
2503d23b
NB
681 return rv;
682}
683
2904b26f 684int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume)
2503d23b 685{
33a6535d
AW
686 char dv[PATH_MAX];
687 char nm[PATH_MAX];
2503d23b
NB
688 char *dname;
689 int rv;
690
691 sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor);
692 rv = sysfs_set_str(sra, NULL, "new_dev", dv);
693 if (rv)
694 return rv;
695
696 memset(nm, 0, sizeof(nm));
bc17158d 697 dname = devid2kname(makedev(sd->disk.major, sd->disk.minor));
2503d23b
NB
698 strcpy(sd->sys_name, "dev-");
699 strcpy(sd->sys_name+4, dname);
700
2904b26f
DW
701 /* test write to see if 'recovery_start' is available */
702 if (resume && sd->recovery_start < MaxSector &&
703 sysfs_set_num(sra, sd, "recovery_start", 0)) {
704 sysfs_set_str(sra, sd, "state", "remove");
705 return -1;
706 }
707
73649188 708 rv = sysfs_set_num(sra, sd, "offset", sd->data_offset);
2503d23b
NB
709 rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2);
710 if (sra->array.level != LEVEL_CONTAINER) {
d23534e4 711 if (sd->recovery_start == MaxSector)
462906cd
N
712 /* This can correctly fail if array isn't started,
713 * yet, so just ignore status for now.
714 */
d23534e4 715 sysfs_set_str(sra, sd, "state", "insync");
899aead0
AK
716 if (sd->disk.raid_disk >= 0)
717 rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
2904b26f
DW
718 if (resume)
719 sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start);
2503d23b 720 }
2503d23b
NB
721 return rv;
722}
90c8b707 723
755c99fa 724#if 0
90c8b707
DW
725int sysfs_disk_to_sg(int fd)
726{
727 /* from an open block device, try find and open its corresponding
728 * scsi_generic interface
729 */
730 struct stat st;
731 char path[256];
732 char sg_path[256];
5418499a 733 char sg_major_minor[10];
90c8b707
DW
734 char *c;
735 DIR *dir;
736 struct dirent *de;
737 int major, minor, rv;
738
739 if (fstat(fd, &st))
740 return -1;
741
742 snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
743 major(st.st_rdev), minor(st.st_rdev));
744
745 dir = opendir(path);
746 if (!dir)
747 return -1;
748
749 de = readdir(dir);
750 while (de) {
751 if (strncmp("scsi_generic:", de->d_name,
752 strlen("scsi_generic:")) == 0)
753 break;
754 de = readdir(dir);
755 }
756 closedir(dir);
757
758 if (!de)
759 return -1;
760
761 snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name);
762 fd = open(sg_path, O_RDONLY);
763 if (fd < 0)
764 return fd;
765
766 rv = read(fd, sg_major_minor, sizeof(sg_major_minor));
767 close(fd);
5418499a 768 if (rv < 0 || rv == sizeof(sg_major_minor))
90c8b707
DW
769 return -1;
770 else
771 sg_major_minor[rv - 1] = '\0';
772
773 c = strchr(sg_major_minor, ':');
774 *c = '\0';
775 c++;
776 major = strtol(sg_major_minor, NULL, 10);
777 minor = strtol(c, NULL, 10);
778 snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d",
779 (int) getpid(), major, minor);
780 if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) {
781 fd = open(path, O_RDONLY);
782 unlink(path);
783 return fd;
784 }
785
786 return -1;
787}
755c99fa 788#endif
90c8b707 789
f1665f72
DW
790int sysfs_disk_to_scsi_id(int fd, __u32 *id)
791{
792 /* from an open block device, try to retrieve it scsi_id */
793 struct stat st;
794 char path[256];
f1665f72
DW
795 DIR *dir;
796 struct dirent *de;
d8924477 797 int host, bus, target, lun;
f1665f72
DW
798
799 if (fstat(fd, &st))
800 return 1;
801
fa89bdee 802 snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device",
f1665f72
DW
803 major(st.st_rdev), minor(st.st_rdev));
804
805 dir = opendir(path);
806 if (!dir)
807 return 1;
808
d8924477
DW
809 for (de = readdir(dir); de; de = readdir(dir)) {
810 int count;
811
812 if (de->d_type != DT_DIR)
813 continue;
814
815 count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun);
816 if (count == 4)
f1665f72 817 break;
f1665f72
DW
818 }
819 closedir(dir);
820
821 if (!de)
822 return 1;
823
d8924477 824 *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0);
f1665f72
DW
825 return 0;
826}
f94d52f4 827
4dd2df09 828int sysfs_unique_holder(char *devnm, long rdev)
f94d52f4 829{
4dd2df09 830 /* Check that devnm is a holder of rdev,
f94d52f4
NB
831 * and is the only holder.
832 * we should be locked against races by
4dd2df09 833 * an O_EXCL on devnm
aab15415
N
834 * Return values:
835 * 0 - not unique, not even a holder
836 * 1 - unique, this is the only holder.
837 * 2/3 - not unique, there is another holder
838 * -1 - error, cannot find the holders
f94d52f4
NB
839 */
840 DIR *dir;
841 struct dirent *de;
842 char dirname[100];
843 char l;
aab15415 844 int ret = 0;
f94d52f4
NB
845 sprintf(dirname, "/sys/dev/block/%d:%d/holders",
846 major(rdev), minor(rdev));
847 dir = opendir(dirname);
f94d52f4 848 if (!dir)
aab15415 849 return -1;
f94d52f4
NB
850 l = strlen(dirname);
851 while ((de = readdir(dir)) != NULL) {
4dd2df09
N
852 char buf[100];
853 char *sl;
f94d52f4 854 int n;
f94d52f4
NB
855
856 if (de->d_ino == 0)
857 continue;
858 if (de->d_name[0] == '.')
859 continue;
860 strcpy(dirname+l, "/");
861 strcat(dirname+l, de->d_name);
4dd2df09
N
862 n = readlink(dirname, buf, sizeof(buf)-1);
863 if (n <= 0)
93f1df33 864 continue;
f94d52f4 865 buf[n] = 0;
4dd2df09
N
866 sl = strrchr(buf, '/');
867 if (!sl)
aab15415 868 continue;
4dd2df09 869 sl++;
f94d52f4 870
4dd2df09 871 if (strcmp(devnm, sl) == 0)
aab15415
N
872 ret |= 1;
873 else
874 ret |= 2;
f94d52f4
NB
875 }
876 closedir(dir);
aab15415 877 return ret;
f94d52f4 878}
38a07ed6 879
bc77ed53
DW
880int sysfs_freeze_array(struct mdinfo *sra)
881{
882 /* Try to freeze resync/rebuild on this array/container.
883 * Return -1 if the array is busy,
bc77ed53
DW
884 * return 0 if this kernel doesn't support 'frozen'
885 * return 1 if it worked.
886 */
887 char buf[20];
888
889 if (!sysfs_attribute_available(sra, NULL, "sync_action"))
890 return 1; /* no sync_action == frozen */
891 if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0)
892 return 0;
fd324b08
N
893 if (strcmp(buf, "frozen\n") == 0)
894 /* Already frozen */
895 return 0;
dea3786a 896 if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0)
bc77ed53
DW
897 return -1;
898 if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0)
899 return 0;
900 return 1;
901}
efc67e8e
N
902
903int sysfs_wait(int fd, int *msec)
904{
905 /* Wait up to '*msec' for fd to have an exception condition.
906 * if msec == NULL, wait indefinitely.
907 */
908 fd_set fds;
909 int n;
910 FD_ZERO(&fds);
911 FD_SET(fd, &fds);
912 if (msec == NULL)
913 n = select(fd+1, NULL, NULL, &fds, NULL);
914 else if (*msec < 0)
915 n = 0;
916 else {
917 struct timeval start, end, tv;
918 gettimeofday(&start, NULL);
4bffc964
N
919 if (*msec < 1000) {
920 tv.tv_sec = 0;
efc67e8e 921 tv.tv_usec = (*msec)*1000;
4bffc964 922 } else {
efc67e8e 923 tv.tv_sec = (*msec)/1000;
4bffc964
N
924 tv.tv_usec = 0;
925 }
efc67e8e
N
926 n = select(fd+1, NULL, NULL, &fds, &tv);
927 gettimeofday(&end, NULL);
928 end.tv_sec -= start.tv_sec;
929 *msec -= (end.tv_sec * 1000 + end.tv_usec/1000
4bffc964 930 - start.tv_usec/1000) + 1;
efc67e8e
N
931 }
932 return n;
933}