maps: Use keyvalue for null terminator to indicate 'unset' value
[thirdparty/mdadm.git] / sysfs.c
1 /*
2 * sysfs - extract md related information from sysfs. Part of:
3 * mdadm - manage Linux "md" devices aka RAID arrays.
4 *
5 * Copyright (C) 2006-2009 Neil Brown <neilb@suse.de>
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>
28 #include <ctype.h>
29
30 #define MAX_SYSFS_PATH_LEN 120
31
32 int load_sys(char *path, char *buf, int len)
33 {
34 int fd = open(path, O_RDONLY);
35 int n;
36 if (fd < 0)
37 return -1;
38 n = read(fd, buf, len);
39 close(fd);
40 if (n <0 || n >= len)
41 return -1;
42 buf[n] = 0;
43 if (n && buf[n-1] == '\n')
44 buf[n-1] = 0;
45 return 0;
46 }
47
48 void sysfs_free(struct mdinfo *sra)
49 {
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->bb.entries);
56 free(d);
57 }
58 free(sra->bb.entries);
59 free(sra);
60 sra = sra2;
61 }
62 }
63
64 int sysfs_open(char *devnm, char *devname, char *attr)
65 {
66 char fname[MAX_SYSFS_PATH_LEN];
67 int fd;
68
69 snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/", devnm);
70 if (devname) {
71 strncat(fname, devname, MAX_SYSFS_PATH_LEN - strlen(fname));
72 strncat(fname, "/", MAX_SYSFS_PATH_LEN - strlen(fname));
73 }
74 strncat(fname, attr, MAX_SYSFS_PATH_LEN - strlen(fname));
75 fd = open(fname, O_RDWR);
76 if (fd < 0 && errno == EACCES)
77 fd = open(fname, O_RDONLY);
78 return fd;
79 }
80
81 void sysfs_init_dev(struct mdinfo *mdi, unsigned long devid)
82 {
83 snprintf(mdi->sys_name,
84 sizeof(mdi->sys_name), "dev-%s", devid2kname(devid));
85 }
86
87 int sysfs_init(struct mdinfo *mdi, int fd, char *devnm)
88 {
89 struct stat stb;
90 char fname[MAX_SYSFS_PATH_LEN];
91 int retval = -ENODEV;
92
93 mdi->sys_name[0] = 0;
94 if (fd >= 0)
95 devnm = fd2devnm(fd);
96
97 if (devnm == NULL)
98 goto out;
99
100 snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md", devnm);
101
102 if (stat(fname, &stb))
103 goto out;
104 if (!S_ISDIR(stb.st_mode))
105 goto out;
106 strcpy(mdi->sys_name, devnm);
107
108 retval = 0;
109 out:
110 return retval;
111 }
112
113 struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
114 {
115 char fname[PATH_MAX];
116 char buf[PATH_MAX];
117 char *base;
118 char *dbase;
119 struct mdinfo *sra;
120 struct mdinfo *dev, **devp;
121 DIR *dir = NULL;
122 struct dirent *de;
123
124 sra = xcalloc(1, sizeof(*sra));
125 if (sysfs_init(sra, fd, devnm)) {
126 free(sra);
127 return NULL;
128 }
129
130 sprintf(fname, "/sys/block/%s/md/", sra->sys_name);
131 base = fname + strlen(fname);
132
133 sra->devs = NULL;
134 if (options & GET_VERSION) {
135 strcpy(base, "metadata_version");
136 if (load_sys(fname, buf, sizeof(buf)))
137 goto abort;
138 if (strncmp(buf, "none", 4) == 0) {
139 sra->array.major_version =
140 sra->array.minor_version = -1;
141 strcpy(sra->text_version, "");
142 } else if (strncmp(buf, "external:", 9) == 0) {
143 sra->array.major_version = -1;
144 sra->array.minor_version = -2;
145 strcpy(sra->text_version, buf+9);
146 } else {
147 sscanf(buf, "%d.%d",
148 &sra->array.major_version,
149 &sra->array.minor_version);
150 strcpy(sra->text_version, buf);
151 }
152 }
153 if (options & GET_LEVEL) {
154 strcpy(base, "level");
155 if (load_sys(fname, buf, sizeof(buf)))
156 goto abort;
157 sra->array.level = map_name(pers, buf);
158 }
159 if (options & GET_LAYOUT) {
160 strcpy(base, "layout");
161 if (load_sys(fname, buf, sizeof(buf)))
162 goto abort;
163 sra->array.layout = strtoul(buf, NULL, 0);
164 }
165 if (options & GET_DISKS) {
166 strcpy(base, "raid_disks");
167 if (load_sys(fname, buf, sizeof(buf)))
168 goto abort;
169 sra->array.raid_disks = strtoul(buf, NULL, 0);
170 }
171 if (options & GET_DEGRADED) {
172 strcpy(base, "degraded");
173 if (load_sys(fname, buf, sizeof(buf)))
174 goto abort;
175 sra->array.failed_disks = strtoul(buf, NULL, 0);
176 }
177 if (options & GET_COMPONENT) {
178 strcpy(base, "component_size");
179 if (load_sys(fname, buf, sizeof(buf)))
180 goto abort;
181 sra->component_size = strtoull(buf, NULL, 0);
182 /* sysfs reports "K", but we want sectors */
183 sra->component_size *= 2;
184 }
185 if (options & GET_CHUNK) {
186 strcpy(base, "chunk_size");
187 if (load_sys(fname, buf, sizeof(buf)))
188 goto abort;
189 sra->array.chunk_size = strtoul(buf, NULL, 0);
190 }
191 if (options & GET_CACHE) {
192 strcpy(base, "stripe_cache_size");
193 if (load_sys(fname, buf, sizeof(buf)))
194 /* Probably level doesn't support it */
195 sra->cache_size = 0;
196 else
197 sra->cache_size = strtoul(buf, NULL, 0);
198 }
199 if (options & GET_MISMATCH) {
200 strcpy(base, "mismatch_cnt");
201 if (load_sys(fname, buf, sizeof(buf)))
202 goto abort;
203 sra->mismatch_cnt = strtoul(buf, NULL, 0);
204 }
205 if (options & GET_SAFEMODE) {
206 int scale = 1;
207 int dot = 0;
208 unsigned i;
209 unsigned long msec;
210 size_t len;
211
212 strcpy(base, "safe_mode_delay");
213 if (load_sys(fname, buf, sizeof(buf)))
214 goto abort;
215
216 /* remove a period, and count digits after it */
217 len = strlen(buf);
218 for (i = 0; i < len; i++) {
219 if (dot) {
220 if (isdigit(buf[i])) {
221 buf[i-1] = buf[i];
222 scale *= 10;
223 }
224 buf[i] = 0;
225 } else if (buf[i] == '.') {
226 dot=1;
227 buf[i] = 0;
228 }
229 }
230 msec = strtoul(buf, NULL, 10);
231 msec = (msec * 1000) / scale;
232 sra->safe_mode_delay = msec;
233 }
234 if (options & GET_BITMAP_LOCATION) {
235 strcpy(base, "bitmap/location");
236 if (load_sys(fname, buf, sizeof(buf)))
237 goto abort;
238 if (strncmp(buf, "file", 4) == 0)
239 sra->bitmap_offset = 1;
240 else if (strncmp(buf, "none", 4) == 0)
241 sra->bitmap_offset = 0;
242 else if (buf[0] == '+')
243 sra->bitmap_offset = strtol(buf+1, NULL, 10);
244 else
245 goto abort;
246 }
247
248 if (options & GET_ARRAY_STATE) {
249 strcpy(base, "array_state");
250 if (load_sys(fname, buf, sizeof(buf)))
251 goto abort;
252 sra->array_state = map_name(sysfs_array_states, buf);
253 }
254
255 if (options & GET_CONSISTENCY_POLICY) {
256 strcpy(base, "consistency_policy");
257 if (load_sys(fname, buf, sizeof(buf))) {
258 sra->consistency_policy = CONSISTENCY_POLICY_UNKNOWN;
259 } else {
260 sra->consistency_policy = map_name(consistency_policies, buf);
261 if (sra->consistency_policy == UnSet)
262 sra->consistency_policy = CONSISTENCY_POLICY_UNKNOWN;
263 }
264 }
265
266 if (! (options & GET_DEVS))
267 return sra;
268
269 /* Get all the devices as well */
270 *base = 0;
271 dir = opendir(fname);
272 if (!dir)
273 goto abort;
274 sra->array.spare_disks = 0;
275
276 devp = &sra->devs;
277 sra->devs = NULL;
278 while ((de = readdir(dir)) != NULL) {
279 char *ep;
280 if (de->d_ino == 0 ||
281 strncmp(de->d_name, "dev-", 4) != 0)
282 continue;
283 strcpy(base, de->d_name);
284 dbase = base + strlen(base);
285 *dbase++ = '/';
286
287 dev = xcalloc(1, sizeof(*dev));
288
289 /* Always get slot, major, minor */
290 strcpy(dbase, "slot");
291 if (load_sys(fname, buf, sizeof(buf))) {
292 /* hmm... unable to read 'slot' maybe the device
293 * is going away?
294 */
295 strcpy(dbase, "block");
296 if (readlink(fname, buf, sizeof(buf)) < 0 &&
297 errno != ENAMETOOLONG) {
298 /* ...yup device is gone */
299 free(dev);
300 continue;
301 } else {
302 /* slot is unreadable but 'block' link
303 * still intact... something bad is happening
304 * so abort
305 */
306 free(dev);
307 goto abort;
308 }
309
310 }
311 strcpy(dev->sys_name, de->d_name);
312 dev->disk.raid_disk = strtoul(buf, &ep, 10);
313 if (*ep) dev->disk.raid_disk = -1;
314
315 strcpy(dbase, "block/dev");
316 if (load_sys(fname, buf, sizeof(buf))) {
317 /* assume this is a stale reference to a hot
318 * removed device
319 */
320 free(dev);
321 continue;
322 }
323 sra->array.nr_disks++;
324 sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
325
326 /* special case check for block devices that can go 'offline' */
327 strcpy(dbase, "block/device/state");
328 if (load_sys(fname, buf, sizeof(buf)) == 0 &&
329 strncmp(buf, "offline", 7) == 0) {
330 free(dev);
331 continue;
332 }
333
334 /* finally add this disk to the array */
335 *devp = dev;
336 devp = & dev->next;
337 dev->next = NULL;
338
339 if (options & GET_OFFSET) {
340 strcpy(dbase, "offset");
341 if (load_sys(fname, buf, sizeof(buf)))
342 goto abort;
343 dev->data_offset = strtoull(buf, NULL, 0);
344 strcpy(dbase, "new_offset");
345 if (load_sys(fname, buf, sizeof(buf)) == 0)
346 dev->new_data_offset = strtoull(buf, NULL, 0);
347 else
348 dev->new_data_offset = dev->data_offset;
349 }
350 if (options & GET_SIZE) {
351 strcpy(dbase, "size");
352 if (load_sys(fname, buf, sizeof(buf)))
353 goto abort;
354 dev->component_size = strtoull(buf, NULL, 0) * 2;
355 }
356 if (options & GET_STATE) {
357 dev->disk.state = 0;
358 strcpy(dbase, "state");
359 if (load_sys(fname, buf, sizeof(buf)))
360 goto abort;
361 if (strstr(buf, "in_sync"))
362 dev->disk.state |= (1<<MD_DISK_SYNC);
363 if (strstr(buf, "faulty"))
364 dev->disk.state |= (1<<MD_DISK_FAULTY);
365 if (dev->disk.state == 0)
366 sra->array.spare_disks++;
367 }
368 if (options & GET_ERROR) {
369 strcpy(buf, "errors");
370 if (load_sys(fname, buf, sizeof(buf)))
371 goto abort;
372 dev->errors = strtoul(buf, NULL, 0);
373 }
374 }
375 closedir(dir);
376 return sra;
377
378 abort:
379 if (dir)
380 closedir(dir);
381 sysfs_free(sra);
382 return NULL;
383 }
384
385 int sysfs_attr_match(const char *attr, const char *str)
386 {
387 /* See if attr, read from a sysfs file, matches
388 * str. They must either be the same, or attr can
389 * have a trailing newline or comma
390 */
391 while (*attr && *str && *attr == *str) {
392 attr++;
393 str++;
394 }
395
396 if (*str || (*attr && *attr != ',' && *attr != '\n'))
397 return 0;
398 return 1;
399 }
400
401 int sysfs_match_word(const char *word, char **list)
402 {
403 int n;
404 for (n=0; list[n]; n++)
405 if (sysfs_attr_match(word, list[n]))
406 break;
407 return n;
408 }
409
410 unsigned long long get_component_size(int fd)
411 {
412 /* Find out the component size of the array.
413 * We cannot trust GET_ARRAY_INFO ioctl as it's
414 * size field is only 32bits.
415 * So look in /sys/block/mdXXX/md/component_size
416 *
417 * This returns in units of sectors.
418 */
419 struct stat stb;
420 char fname[MAX_SYSFS_PATH_LEN];
421 int n;
422 if (fstat(fd, &stb))
423 return 0;
424 snprintf(fname, MAX_SYSFS_PATH_LEN,
425 "/sys/block/%s/md/component_size", stat2devnm(&stb));
426 fd = open(fname, O_RDONLY);
427 if (fd < 0)
428 return 0;
429 n = read(fd, fname, sizeof(fname));
430 close(fd);
431 if (n < 0 || n == sizeof(fname))
432 return 0;
433 fname[n] = 0;
434 return strtoull(fname, NULL, 10) * 2;
435 }
436
437 int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
438 char *name, char *val)
439 {
440 char fname[MAX_SYSFS_PATH_LEN];
441 unsigned int n;
442 int fd;
443
444 snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
445 sra->sys_name, dev?dev->sys_name:"", name);
446 fd = open(fname, O_WRONLY);
447 if (fd < 0)
448 return -1;
449 n = write(fd, val, strlen(val));
450 close(fd);
451 if (n != strlen(val)) {
452 dprintf("failed to write '%s' to '%s' (%s)\n",
453 val, fname, strerror(errno));
454 return -1;
455 }
456 return 0;
457 }
458
459 int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
460 char *name, unsigned long long val)
461 {
462 char valstr[50];
463 sprintf(valstr, "%llu", val);
464 return sysfs_set_str(sra, dev, name, valstr);
465 }
466
467 int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev,
468 char *name, long long val)
469 {
470 char valstr[50];
471 sprintf(valstr, "%lli", val);
472 return sysfs_set_str(sra, dev, name, valstr);
473 }
474
475 int sysfs_uevent(struct mdinfo *sra, char *event)
476 {
477 char fname[MAX_SYSFS_PATH_LEN];
478 int n;
479 int fd;
480
481 snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/uevent",
482 sra->sys_name);
483 fd = open(fname, O_WRONLY);
484 if (fd < 0)
485 return -1;
486 n = write(fd, event, strlen(event));
487 close(fd);
488 if (n != (int)strlen(event)) {
489 dprintf("failed to write '%s' to '%s' (%s)\n",
490 event, fname, strerror(errno));
491 return -1;
492 }
493 return 0;
494 }
495
496 int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name)
497 {
498 char fname[MAX_SYSFS_PATH_LEN];
499 struct stat st;
500
501 snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
502 sra->sys_name, dev?dev->sys_name:"", name);
503
504 return stat(fname, &st) == 0;
505 }
506
507 int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev,
508 char *name)
509 {
510 char fname[MAX_SYSFS_PATH_LEN];
511 int fd;
512
513 snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
514 sra->sys_name, dev?dev->sys_name:"", name);
515 fd = open(fname, O_RDWR);
516 if (fd < 0)
517 fd = open(fname, O_RDONLY);
518 return fd;
519 }
520
521 int sysfs_fd_get_ll(int fd, unsigned long long *val)
522 {
523 char buf[50];
524 int n;
525 char *ep;
526
527 lseek(fd, 0, 0);
528 n = read(fd, buf, sizeof(buf));
529 if (n <= 0 || n == sizeof(buf))
530 return -2;
531 buf[n] = 0;
532 *val = strtoull(buf, &ep, 0);
533 if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
534 return -1;
535 return 0;
536 }
537
538 int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
539 char *name, unsigned long long *val)
540 {
541 int n;
542 int fd;
543
544 fd = sysfs_get_fd(sra, dev, name);
545 if (fd < 0)
546 return -1;
547 n = sysfs_fd_get_ll(fd, val);
548 close(fd);
549 return n;
550 }
551
552 int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2)
553 {
554 /* two numbers in this sysfs file, either
555 * NNN (NNN)
556 * or
557 * NNN / NNN
558 */
559 char buf[80];
560 int n;
561 char *ep, *ep2;
562
563 lseek(fd, 0, 0);
564 n = read(fd, buf, sizeof(buf));
565 if (n <= 0 || n == sizeof(buf))
566 return -2;
567 buf[n] = 0;
568 *v1 = strtoull(buf, &ep, 0);
569 if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
570 return -1;
571 while (*ep == ' ' || *ep == '/' || *ep == '(')
572 ep++;
573 *v2 = strtoull(ep, &ep2, 0);
574 if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) {
575 *v2 = *v1;
576 return 1;
577 }
578 return 2;
579 }
580
581 int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev,
582 char *name, unsigned long long *v1, unsigned long long *v2)
583 {
584 int n;
585 int fd;
586
587 fd = sysfs_get_fd(sra, dev, name);
588 if (fd < 0)
589 return -1;
590 n = sysfs_fd_get_two(fd, v1, v2);
591 close(fd);
592 return n;
593 }
594
595 int sysfs_fd_get_str(int fd, char *val, int size)
596 {
597 int n;
598
599 lseek(fd, 0, 0);
600 n = read(fd, val, size);
601 if (n <= 0 || n == size)
602 return -1;
603 val[n] = 0;
604 return n;
605 }
606
607 int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev,
608 char *name, char *val, int size)
609 {
610 int n;
611 int fd;
612
613 fd = sysfs_get_fd(sra, dev, name);
614 if (fd < 0)
615 return -1;
616 n = sysfs_fd_get_str(fd, val, size);
617 close(fd);
618 return n;
619 }
620
621 int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms)
622 {
623 unsigned long sec;
624 unsigned long msec;
625 char delay[30];
626
627 sec = ms / 1000;
628 msec = ms % 1000;
629
630 sprintf(delay, "%ld.%03ld\n", sec, msec);
631 /* this '\n' ^ needed for kernels older than 2.6.28 */
632 return sysfs_set_str(sra, NULL, "safe_mode_delay", delay);
633 }
634
635 int sysfs_set_array(struct mdinfo *info, int vers)
636 {
637 int rv = 0;
638 char ver[100];
639 int raid_disks = info->array.raid_disks;
640
641 ver[0] = 0;
642 if (info->array.major_version == -1 &&
643 info->array.minor_version == -2) {
644 char buf[1024];
645
646 strcat(strcpy(ver, "external:"), info->text_version);
647
648 /* meta version might already be set if we are setting
649 * new geometry for a reshape. In that case we don't
650 * want to over-write the 'readonly' flag that is
651 * stored in the metadata version. So read the current
652 * version first, and preserve the flag
653 */
654 if (sysfs_get_str(info, NULL, "metadata_version",
655 buf, 1024) > 0)
656 if (strlen(buf) >= 9 && buf[9] == '-')
657 ver[9] = '-';
658
659 if ((vers % 100) < 2 ||
660 sysfs_set_str(info, NULL, "metadata_version",
661 ver) < 0) {
662 pr_err("This kernel does not support external metadata.\n");
663 return 1;
664 }
665 }
666 if (info->array.level < 0)
667 return 0; /* FIXME */
668 rv |= sysfs_set_str(info, NULL, "level",
669 map_num(pers, info->array.level));
670 if (info->reshape_active && info->delta_disks != UnSet)
671 raid_disks -= info->delta_disks;
672 rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks);
673 rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size);
674 rv |= sysfs_set_num(info, NULL, "layout", info->array.layout);
675 rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2);
676 if (info->custom_array_size) {
677 int rc;
678
679 rc = sysfs_set_num(info, NULL, "array_size",
680 info->custom_array_size/2);
681 if (rc && errno == ENOENT) {
682 pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n");
683 rc = 0;
684 }
685 rv |= rc;
686 }
687
688 if (info->array.level > 0)
689 rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start);
690
691 if (info->reshape_active) {
692 rv |= sysfs_set_num(info, NULL, "reshape_position",
693 info->reshape_progress);
694 rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk);
695 rv |= sysfs_set_num(info, NULL, "layout", info->new_layout);
696 rv |= sysfs_set_num(info, NULL, "raid_disks",
697 info->array.raid_disks);
698 /* We don't set 'new_level' here. That can only happen
699 * once the reshape completes.
700 */
701 }
702
703 if (info->consistency_policy == CONSISTENCY_POLICY_PPL) {
704 if (sysfs_set_str(info, NULL, "consistency_policy",
705 map_num(consistency_policies,
706 info->consistency_policy))) {
707 pr_err("This kernel does not support PPL\n");
708 return 1;
709 }
710 }
711
712 return rv;
713 }
714
715 int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume)
716 {
717 char dv[PATH_MAX];
718 char nm[PATH_MAX];
719 char *dname;
720 int rv;
721 int i;
722
723 sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor);
724 rv = sysfs_set_str(sra, NULL, "new_dev", dv);
725 if (rv)
726 return rv;
727
728 memset(nm, 0, sizeof(nm));
729 dname = devid2kname(makedev(sd->disk.major, sd->disk.minor));
730 strcpy(sd->sys_name, "dev-");
731 strcpy(sd->sys_name+4, dname);
732
733 /* test write to see if 'recovery_start' is available */
734 if (resume && sd->recovery_start < MaxSector &&
735 sysfs_set_num(sra, sd, "recovery_start", 0)) {
736 sysfs_set_str(sra, sd, "state", "remove");
737 return -1;
738 }
739
740 rv = sysfs_set_num(sra, sd, "offset", sd->data_offset);
741 rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2);
742 if (sra->array.level != LEVEL_CONTAINER) {
743 if (sd->consistency_policy == CONSISTENCY_POLICY_PPL) {
744 rv |= sysfs_set_num(sra, sd, "ppl_sector", sd->ppl_sector);
745 rv |= sysfs_set_num(sra, sd, "ppl_size", sd->ppl_size);
746 }
747 if (sd->recovery_start == MaxSector)
748 /* This can correctly fail if array isn't started,
749 * yet, so just ignore status for now.
750 */
751 sysfs_set_str(sra, sd, "state", "insync");
752 if (sd->disk.raid_disk >= 0)
753 rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
754 if (resume)
755 sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start);
756 }
757 if (sd->bb.supported) {
758 if (sysfs_set_str(sra, sd, "state", "external_bbl")) {
759 /*
760 * backward compatibility - if kernel doesn't support
761 * bad blocks for external metadata, let it continue
762 * as long as there are none known so far
763 */
764 if (sd->bb.count) {
765 pr_err("The kernel has no support for bad blocks in external metadata\n");
766 return -1;
767 }
768 }
769
770 for (i = 0; i < sd->bb.count; i++) {
771 char s[30];
772 const struct md_bb_entry *entry = &sd->bb.entries[i];
773
774 snprintf(s, sizeof(s) - 1, "%llu %d\n", entry->sector,
775 entry->length);
776 rv |= sysfs_set_str(sra, sd, "bad_blocks", s);
777 }
778 }
779 return rv;
780 }
781
782 #if 0
783 int sysfs_disk_to_sg(int fd)
784 {
785 /* from an open block device, try find and open its corresponding
786 * scsi_generic interface
787 */
788 struct stat st;
789 char path[256];
790 char sg_path[256];
791 char sg_major_minor[10];
792 char *c;
793 DIR *dir;
794 struct dirent *de;
795 int major, minor, rv;
796
797 if (fstat(fd, &st))
798 return -1;
799
800 snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
801 major(st.st_rdev), minor(st.st_rdev));
802
803 dir = opendir(path);
804 if (!dir)
805 return -1;
806
807 de = readdir(dir);
808 while (de) {
809 if (strncmp("scsi_generic:", de->d_name,
810 strlen("scsi_generic:")) == 0)
811 break;
812 de = readdir(dir);
813 }
814 closedir(dir);
815
816 if (!de)
817 return -1;
818
819 snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name);
820 fd = open(sg_path, O_RDONLY);
821 if (fd < 0)
822 return fd;
823
824 rv = read(fd, sg_major_minor, sizeof(sg_major_minor));
825 close(fd);
826 if (rv < 0 || rv == sizeof(sg_major_minor))
827 return -1;
828 else
829 sg_major_minor[rv - 1] = '\0';
830
831 c = strchr(sg_major_minor, ':');
832 *c = '\0';
833 c++;
834 major = strtol(sg_major_minor, NULL, 10);
835 minor = strtol(c, NULL, 10);
836 snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d",
837 (int) getpid(), major, minor);
838 if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) {
839 fd = open(path, O_RDONLY);
840 unlink(path);
841 return fd;
842 }
843
844 return -1;
845 }
846 #endif
847
848 int sysfs_disk_to_scsi_id(int fd, __u32 *id)
849 {
850 /* from an open block device, try to retrieve it scsi_id */
851 struct stat st;
852 char path[256];
853 DIR *dir;
854 struct dirent *de;
855 int host, bus, target, lun;
856
857 if (fstat(fd, &st))
858 return 1;
859
860 snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device",
861 major(st.st_rdev), minor(st.st_rdev));
862
863 dir = opendir(path);
864 if (!dir)
865 return 1;
866
867 for (de = readdir(dir); de; de = readdir(dir)) {
868 int count;
869
870 if (de->d_type != DT_DIR)
871 continue;
872
873 count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun);
874 if (count == 4)
875 break;
876 }
877 closedir(dir);
878
879 if (!de)
880 return 1;
881
882 *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0);
883 return 0;
884 }
885
886 int sysfs_unique_holder(char *devnm, long rdev)
887 {
888 /* Check that devnm is a holder of rdev,
889 * and is the only holder.
890 * we should be locked against races by
891 * an O_EXCL on devnm
892 * Return values:
893 * 0 - not unique, not even a holder
894 * 1 - unique, this is the only holder.
895 * 2/3 - not unique, there is another holder
896 * -1 - error, cannot find the holders
897 */
898 DIR *dir;
899 struct dirent *de;
900 char dirname[100];
901 char l;
902 int ret = 0;
903 sprintf(dirname, "/sys/dev/block/%d:%d/holders",
904 major(rdev), minor(rdev));
905 dir = opendir(dirname);
906 if (!dir)
907 return -1;
908 l = strlen(dirname);
909 while ((de = readdir(dir)) != NULL) {
910 char buf[100];
911 char *sl;
912 int n;
913
914 if (de->d_ino == 0)
915 continue;
916 if (de->d_name[0] == '.')
917 continue;
918 strcpy(dirname+l, "/");
919 strcat(dirname+l, de->d_name);
920 n = readlink(dirname, buf, sizeof(buf)-1);
921 if (n <= 0)
922 continue;
923 buf[n] = 0;
924 sl = strrchr(buf, '/');
925 if (!sl)
926 continue;
927 sl++;
928
929 if (strcmp(devnm, sl) == 0)
930 ret |= 1;
931 else
932 ret |= 2;
933 }
934 closedir(dir);
935 return ret;
936 }
937
938 int sysfs_freeze_array(struct mdinfo *sra)
939 {
940 /* Try to freeze resync/rebuild on this array/container.
941 * Return -1 if the array is busy,
942 * return 0 if this kernel doesn't support 'frozen'
943 * return 1 if it worked.
944 */
945 char buf[20];
946
947 if (!sysfs_attribute_available(sra, NULL, "sync_action"))
948 return 1; /* no sync_action == frozen */
949 if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0)
950 return 0;
951 if (strcmp(buf, "frozen\n") == 0)
952 /* Already frozen */
953 return 0;
954 if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0)
955 return -1;
956 if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0)
957 return 0;
958 return 1;
959 }
960
961 int sysfs_wait(int fd, int *msec)
962 {
963 /* Wait up to '*msec' for fd to have an exception condition.
964 * if msec == NULL, wait indefinitely.
965 */
966 fd_set fds;
967 int n;
968 FD_ZERO(&fds);
969 FD_SET(fd, &fds);
970 if (msec == NULL)
971 n = select(fd+1, NULL, NULL, &fds, NULL);
972 else if (*msec < 0)
973 n = 0;
974 else {
975 struct timeval start, end, tv;
976 gettimeofday(&start, NULL);
977 if (*msec < 1000) {
978 tv.tv_sec = 0;
979 tv.tv_usec = (*msec)*1000;
980 } else {
981 tv.tv_sec = (*msec)/1000;
982 tv.tv_usec = 0;
983 }
984 n = select(fd+1, NULL, NULL, &fds, &tv);
985 gettimeofday(&end, NULL);
986 end.tv_sec -= start.tv_sec;
987 *msec -= (end.tv_sec * 1000 + end.tv_usec/1000
988 - start.tv_usec/1000) + 1;
989 }
990 return n;
991 }