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Release mdadm-3.2.2
[thirdparty/mdadm.git] / Monitor.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@suse.de>
23 */
24
25 #include "mdadm.h"
26 #include "md_p.h"
27 #include "md_u.h"
28 #include <sys/wait.h>
29 #include <signal.h>
30 #include <limits.h>
31 #include <syslog.h>
32
33 /* The largest number of disks current arrays can manage is 384
34 * This really should be dynamically, but that will have to wait
35 * At least it isn't MD_SB_DISKS.
36 */
37 #define MaxDisks 384
38 struct state {
39 char *devname;
40 int devnum; /* to sync with mdstat info */
41 long utime;
42 int err;
43 char *spare_group;
44 int active, working, failed, spare, raid;
45 int expected_spares;
46 int devstate[MaxDisks];
47 dev_t devid[MaxDisks];
48 int percent;
49 int parent_dev; /* For subarray, devnum of parent.
50 * For others, NoMdDev
51 */
52 struct supertype *metadata;
53 struct state *subarray;/* for a container it is a link to first subarray
54 * for a subarray it is a link to next subarray
55 * in the same container */
56 struct state *parent; /* for a subarray it is a link to its container
57 */
58 struct state *next;
59 };
60
61 struct alert_info {
62 char *mailaddr;
63 char *mailfrom;
64 char *alert_cmd;
65 int dosyslog;
66 };
67 static int make_daemon(char *pidfile);
68 static int check_one_sharer(int scan);
69 static void alert(char *event, char *dev, char *disc, struct alert_info *info);
70 static int check_array(struct state *st, struct mdstat_ent *mdstat,
71 int test, struct alert_info *info,
72 int increments);
73 static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist,
74 int test, struct alert_info *info);
75 static void try_spare_migration(struct state *statelist, struct alert_info *info);
76 static void link_containers_with_subarrays(struct state *list);
77
78 int Monitor(struct mddev_dev *devlist,
79 char *mailaddr, char *alert_cmd,
80 int period, int daemonise, int scan, int oneshot,
81 int dosyslog, int test, char *pidfile, int increments,
82 int share)
83 {
84 /*
85 * Every few seconds, scan every md device looking for changes
86 * When a change is found, log it, possibly run the alert command,
87 * and possibly send Email
88 *
89 * For each array, we record:
90 * Update time
91 * active/working/failed/spare drives
92 * State of each device.
93 * %rebuilt if rebuilding
94 *
95 * If the update time changes, check out all the data again
96 * It is possible that we cannot get the state of each device
97 * due to bugs in the md kernel module.
98 * We also read /proc/mdstat to get rebuild percent,
99 * and to get state on all active devices incase of kernel bug.
100 *
101 * Events are:
102 * Fail
103 * An active device had Faulty set or Active/Sync removed
104 * FailSpare
105 * A spare device had Faulty set
106 * SpareActive
107 * An active device had a reverse transition
108 * RebuildStarted
109 * percent went from -1 to +ve
110 * RebuildNN
111 * percent went from below to not-below NN%
112 * DeviceDisappeared
113 * Couldn't access a device which was previously visible
114 *
115 * if we detect an array with active<raid and spare==0
116 * we look at other arrays that have same spare-group
117 * If we find one with active==raid and spare>0,
118 * and if we can get_disk_info and find a name
119 * Then we hot-remove and hot-add to the other array
120 *
121 * If devlist is NULL, then we can monitor everything because --scan
122 * was given. We get an initial list from config file and add anything
123 * that appears in /proc/mdstat
124 */
125
126 struct state *statelist = NULL;
127 int finished = 0;
128 struct mdstat_ent *mdstat = NULL;
129 char *mailfrom = NULL;
130 struct alert_info info;
131
132 if (!mailaddr) {
133 mailaddr = conf_get_mailaddr();
134 if (mailaddr && ! scan)
135 fprintf(stderr, Name ": Monitor using email address \"%s\" from config file\n",
136 mailaddr);
137 }
138 mailfrom = conf_get_mailfrom();
139
140 if (!alert_cmd) {
141 alert_cmd = conf_get_program();
142 if (alert_cmd && ! scan)
143 fprintf(stderr, Name ": Monitor using program \"%s\" from config file\n",
144 alert_cmd);
145 }
146 if (scan && !mailaddr && !alert_cmd && !dosyslog) {
147 fprintf(stderr, Name ": No mail address or alert command - not monitoring.\n");
148 return 1;
149 }
150 info.alert_cmd = alert_cmd;
151 info.mailaddr = mailaddr;
152 info.mailfrom = mailfrom;
153 info.dosyslog = dosyslog;
154
155 if (daemonise) {
156 int rv = make_daemon(pidfile);
157 if (rv >= 0)
158 return rv;
159 }
160
161 if (share)
162 if (check_one_sharer(scan))
163 return 1;
164
165 if (devlist == NULL) {
166 struct mddev_ident *mdlist = conf_get_ident(NULL);
167 for (; mdlist; mdlist=mdlist->next) {
168 struct state *st;
169 if (mdlist->devname == NULL)
170 continue;
171 if (strcasecmp(mdlist->devname, "<ignore>") == 0)
172 continue;
173 st = calloc(1, sizeof *st);
174 if (st == NULL)
175 continue;
176 if (mdlist->devname[0] == '/')
177 st->devname = strdup(mdlist->devname);
178 else {
179 st->devname = malloc(8+strlen(mdlist->devname)+1);
180 strcpy(strcpy(st->devname, "/dev/md/"),
181 mdlist->devname);
182 }
183 st->next = statelist;
184 st->devnum = INT_MAX;
185 st->percent = -2;
186 st->expected_spares = mdlist->spare_disks;
187 if (mdlist->spare_group)
188 st->spare_group = strdup(mdlist->spare_group);
189 statelist = st;
190 }
191 } else {
192 struct mddev_dev *dv;
193 for (dv=devlist ; dv; dv=dv->next) {
194 struct mddev_ident *mdlist = conf_get_ident(dv->devname);
195 struct state *st = calloc(1, sizeof *st);
196 if (st == NULL)
197 continue;
198 st->devname = strdup(dv->devname);
199 st->next = statelist;
200 st->devnum = INT_MAX;
201 st->percent = -2;
202 st->expected_spares = -1;
203 if (mdlist) {
204 st->expected_spares = mdlist->spare_disks;
205 if (mdlist->spare_group)
206 st->spare_group = strdup(mdlist->spare_group);
207 }
208 statelist = st;
209 }
210 }
211
212
213 while (! finished) {
214 int new_found = 0;
215 struct state *st;
216 int anydegraded = 0;
217
218 if (mdstat)
219 free_mdstat(mdstat);
220 mdstat = mdstat_read(oneshot?0:1, 0);
221
222 for (st=statelist; st; st=st->next)
223 if (check_array(st, mdstat, test, &info, increments))
224 anydegraded = 1;
225
226 /* now check if there are any new devices found in mdstat */
227 if (scan)
228 new_found = add_new_arrays(mdstat, &statelist, test,
229 &info);
230
231 /* If an array has active < raid && spare == 0 && spare_group != NULL
232 * Look for another array with spare > 0 and active == raid and same spare_group
233 * if found, choose a device and hotremove/hotadd
234 */
235 if (share && anydegraded)
236 try_spare_migration(statelist, &info);
237 if (!new_found) {
238 if (oneshot)
239 break;
240 else
241 mdstat_wait(period);
242 }
243 test = 0;
244 }
245 if (pidfile)
246 unlink(pidfile);
247 return 0;
248 }
249
250 static int make_daemon(char *pidfile)
251 {
252 /* Return:
253 * -1 in the forked daemon
254 * 0 in the parent
255 * 1 on error
256 * so a none-negative becomes the exit code.
257 */
258 int pid = fork();
259 if (pid > 0) {
260 if (!pidfile)
261 printf("%d\n", pid);
262 else {
263 FILE *pid_file;
264 pid_file=fopen(pidfile, "w");
265 if (!pid_file)
266 perror("cannot create pid file");
267 else {
268 fprintf(pid_file,"%d\n", pid);
269 fclose(pid_file);
270 }
271 }
272 return 0;
273 }
274 if (pid < 0) {
275 perror("daemonise");
276 return 1;
277 }
278 close(0);
279 open("/dev/null", O_RDWR);
280 dup2(0,1);
281 dup2(0,2);
282 setsid();
283 return -1;
284 }
285
286 static int check_one_sharer(int scan)
287 {
288 int pid, rv;
289 FILE *fp;
290 char dir[20];
291 struct stat buf;
292 fp = fopen("/var/run/mdadm/autorebuild.pid", "r");
293 if (fp) {
294 if (fscanf(fp, "%d", &pid) != 1)
295 pid = -1;
296 sprintf(dir, "/proc/%d", pid);
297 rv = stat(dir, &buf);
298 if (rv != -1) {
299 if (scan) {
300 fprintf(stderr, Name ": Only one "
301 "autorebuild process allowed"
302 " in scan mode, aborting\n");
303 fclose(fp);
304 return 1;
305 } else {
306 fprintf(stderr, Name ": Warning: One"
307 " autorebuild process already"
308 " running.\n");
309 }
310 }
311 fclose(fp);
312 }
313 if (scan) {
314 if (mkdir("/var/run/mdadm", S_IRWXU) < 0 &&
315 errno != EEXIST) {
316 fprintf(stderr, Name ": Can't create "
317 "autorebuild.pid file\n");
318 } else {
319 fp = fopen("/var/run/mdadm/autorebuild.pid", "w");
320 if (!fp)
321 fprintf(stderr, Name ": Cannot create"
322 " autorebuild.pid"
323 "file\n");
324 else {
325 pid = getpid();
326 fprintf(fp, "%d\n", pid);
327 fclose(fp);
328 }
329 }
330 }
331 return 0;
332 }
333
334 static void alert(char *event, char *dev, char *disc, struct alert_info *info)
335 {
336 int priority;
337
338 if (!info->alert_cmd && !info->mailaddr && !info->dosyslog) {
339 time_t now = time(0);
340
341 printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
342 }
343 if (info->alert_cmd) {
344 int pid = fork();
345 switch(pid) {
346 default:
347 waitpid(pid, NULL, 0);
348 break;
349 case -1:
350 break;
351 case 0:
352 execl(info->alert_cmd, info->alert_cmd,
353 event, dev, disc, NULL);
354 exit(2);
355 }
356 }
357 if (info->mailaddr &&
358 (strncmp(event, "Fail", 4)==0 ||
359 strncmp(event, "Test", 4)==0 ||
360 strncmp(event, "Spares", 6)==0 ||
361 strncmp(event, "Degrade", 7)==0)) {
362 FILE *mp = popen(Sendmail, "w");
363 if (mp) {
364 FILE *mdstat;
365 char hname[256];
366 gethostname(hname, sizeof(hname));
367 signal(SIGPIPE, SIG_IGN);
368 if (info->mailfrom)
369 fprintf(mp, "From: %s\n", info->mailfrom);
370 else
371 fprintf(mp, "From: " Name " monitoring <root>\n");
372 fprintf(mp, "To: %s\n", info->mailaddr);
373 fprintf(mp, "Subject: %s event on %s:%s\n\n",
374 event, dev, hname);
375
376 fprintf(mp,
377 "This is an automatically generated"
378 " mail message from " Name "\n");
379 fprintf(mp, "running on %s\n\n", hname);
380
381 fprintf(mp,
382 "A %s event had been detected on"
383 " md device %s.\n\n", event, dev);
384
385 if (disc && disc[0] != ' ')
386 fprintf(mp,
387 "It could be related to"
388 " component device %s.\n\n", disc);
389 if (disc && disc[0] == ' ')
390 fprintf(mp, "Extra information:%s.\n\n", disc);
391
392 fprintf(mp, "Faithfully yours, etc.\n");
393
394 mdstat = fopen("/proc/mdstat", "r");
395 if (mdstat) {
396 char buf[8192];
397 int n;
398 fprintf(mp,
399 "\nP.S. The /proc/mdstat file"
400 " currently contains the following:\n\n");
401 while ( (n=fread(buf, 1, sizeof(buf), mdstat)) > 0)
402 n=fwrite(buf, 1, n, mp);
403 fclose(mdstat);
404 }
405 pclose(mp);
406 }
407 }
408
409 /* log the event to syslog maybe */
410 if (info->dosyslog) {
411 /* Log at a different severity depending on the event.
412 *
413 * These are the critical events: */
414 if (strncmp(event, "Fail", 4)==0 ||
415 strncmp(event, "Degrade", 7)==0 ||
416 strncmp(event, "DeviceDisappeared", 17)==0)
417 priority = LOG_CRIT;
418 /* Good to know about, but are not failures: */
419 else if (strncmp(event, "Rebuild", 7)==0 ||
420 strncmp(event, "MoveSpare", 9)==0 ||
421 strncmp(event, "Spares", 6) != 0)
422 priority = LOG_WARNING;
423 /* Everything else: */
424 else
425 priority = LOG_INFO;
426
427 if (disc)
428 syslog(priority,
429 "%s event detected on md device %s,"
430 " component device %s", event, dev, disc);
431 else
432 syslog(priority,
433 "%s event detected on md device %s",
434 event, dev);
435 }
436 }
437
438 static int check_array(struct state *st, struct mdstat_ent *mdstat,
439 int test, struct alert_info *ainfo,
440 int increments)
441 {
442 /* Update the state 'st' to reflect any changes shown in mdstat,
443 * or found by directly examining the array, and return
444 * '1' if the array is degraded, or '0' if it is optimal (or dead).
445 */
446 struct { int state, major, minor; } info[MaxDisks];
447 mdu_array_info_t array;
448 struct mdstat_ent *mse = NULL, *mse2;
449 char *dev = st->devname;
450 int fd;
451 int i;
452 int remaining_disks;
453 int last_disk;
454
455 if (test)
456 alert("TestMessage", dev, NULL, ainfo);
457 fd = open(dev, O_RDONLY);
458 if (fd < 0) {
459 if (!st->err)
460 alert("DeviceDisappeared", dev, NULL, ainfo);
461 st->err=1;
462 return 0;
463 }
464 fcntl(fd, F_SETFD, FD_CLOEXEC);
465 if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
466 if (!st->err)
467 alert("DeviceDisappeared", dev, NULL, ainfo);
468 st->err=1;
469 close(fd);
470 return 0;
471 }
472 /* It's much easier to list what array levels can't
473 * have a device disappear than all of them that can
474 */
475 if (array.level == 0 || array.level == -1) {
476 if (!st->err)
477 alert("DeviceDisappeared", dev, "Wrong-Level", ainfo);
478 st->err = 1;
479 close(fd);
480 return 0;
481 }
482 if (st->devnum == INT_MAX) {
483 struct stat stb;
484 if (fstat(fd, &stb) == 0 &&
485 (S_IFMT&stb.st_mode)==S_IFBLK) {
486 if (major(stb.st_rdev) == MD_MAJOR)
487 st->devnum = minor(stb.st_rdev);
488 else
489 st->devnum = -1- (minor(stb.st_rdev)>>6);
490 }
491 }
492
493 for (mse2 = mdstat ; mse2 ; mse2=mse2->next)
494 if (mse2->devnum == st->devnum) {
495 mse2->devnum = INT_MAX; /* flag it as "used" */
496 mse = mse2;
497 }
498
499 if (!mse) {
500 /* duplicated array in statelist
501 * or re-created after reading mdstat*/
502 st->err = 1;
503 close(fd);
504 return 0;
505 }
506 /* this array is in /proc/mdstat */
507 if (array.utime == 0)
508 /* external arrays don't update utime, so
509 * just make sure it is always different. */
510 array.utime = st->utime + 1;;
511
512 if (st->utime == array.utime &&
513 st->failed == array.failed_disks &&
514 st->working == array.working_disks &&
515 st->spare == array.spare_disks &&
516 (mse == NULL || (
517 mse->percent == st->percent
518 ))) {
519 close(fd);
520 st->err = 0;
521 if ((st->active < st->raid) && st->spare == 0)
522 return 1;
523 else
524 return 0;
525 }
526 if (st->utime == 0 && /* new array */
527 mse->pattern && strchr(mse->pattern, '_') /* degraded */
528 )
529 alert("DegradedArray", dev, NULL, ainfo);
530
531 if (st->utime == 0 && /* new array */
532 st->expected_spares > 0 &&
533 array.spare_disks < st->expected_spares)
534 alert("SparesMissing", dev, NULL, ainfo);
535 if (st->percent == -1 &&
536 mse->percent >= 0)
537 alert("RebuildStarted", dev, NULL, ainfo);
538 if (st->percent >= 0 &&
539 mse->percent >= 0 &&
540 (mse->percent / increments) > (st->percent / increments)) {
541 char percentalert[15]; // "RebuildNN" (10 chars) or "RebuildStarted" (15 chars)
542
543 if((mse->percent / increments) == 0)
544 snprintf(percentalert, sizeof(percentalert), "RebuildStarted");
545 else
546 snprintf(percentalert, sizeof(percentalert), "Rebuild%02d", mse->percent);
547
548 alert(percentalert, dev, NULL, ainfo);
549 }
550
551 if (mse->percent == -1 &&
552 st->percent >= 0) {
553 /* Rebuild/sync/whatever just finished.
554 * If there is a number in /mismatch_cnt,
555 * we should report that.
556 */
557 struct mdinfo *sra =
558 sysfs_read(-1, st->devnum, GET_MISMATCH);
559 if (sra && sra->mismatch_cnt > 0) {
560 char cnt[40];
561 sprintf(cnt, " mismatches found: %d", sra->mismatch_cnt);
562 alert("RebuildFinished", dev, cnt, ainfo);
563 } else
564 alert("RebuildFinished", dev, NULL, ainfo);
565 if (sra)
566 free(sra);
567 }
568 st->percent = mse->percent;
569
570 remaining_disks = array.nr_disks;
571 for (i=0; i<MaxDisks && remaining_disks > 0;
572 i++) {
573 mdu_disk_info_t disc;
574 disc.number = i;
575 if (ioctl(fd, GET_DISK_INFO, &disc) >= 0) {
576 info[i].state = disc.state;
577 info[i].major = disc.major;
578 info[i].minor = disc.minor;
579 if (disc.major || disc.minor)
580 remaining_disks --;
581 } else
582 info[i].major = info[i].minor = 0;
583 }
584 last_disk = i;
585
586 if (mse->metadata_version &&
587 strncmp(mse->metadata_version, "external:", 9) == 0 &&
588 is_subarray(mse->metadata_version+9))
589 st->parent_dev =
590 devname2devnum(mse->metadata_version+10);
591 else
592 st->parent_dev = NoMdDev;
593 if (st->metadata == NULL &&
594 st->parent_dev == NoMdDev)
595 st->metadata = super_by_fd(fd, NULL);
596
597 close(fd);
598
599 for (i=0; i<MaxDisks; i++) {
600 mdu_disk_info_t disc = {0,0,0,0,0};
601 int newstate=0;
602 int change;
603 char *dv = NULL;
604 disc.number = i;
605 if (i >= last_disk) {
606 newstate = 0;
607 disc.major = disc.minor = 0;
608 } else if (info[i].major || info[i].minor) {
609 newstate = info[i].state;
610 dv = map_dev(info[i].major, info[i].minor, 1);
611 disc.state = newstate;
612 disc.major = info[i].major;
613 disc.minor = info[i].minor;
614 } else if (mse && mse->pattern && i < (int)strlen(mse->pattern)) {
615 switch(mse->pattern[i]) {
616 case 'U': newstate = 6 /* ACTIVE/SYNC */; break;
617 case '_': newstate = 8 /* REMOVED */; break;
618 }
619 disc.major = disc.minor = 0;
620 }
621 if (dv == NULL && st->devid[i])
622 dv = map_dev(major(st->devid[i]),
623 minor(st->devid[i]), 1);
624 change = newstate ^ st->devstate[i];
625 if (st->utime && change && !st->err) {
626 if (i < array.raid_disks &&
627 (((newstate&change)&(1<<MD_DISK_FAULTY)) ||
628 ((st->devstate[i]&change)&(1<<MD_DISK_ACTIVE)) ||
629 ((st->devstate[i]&change)&(1<<MD_DISK_SYNC)))
630 )
631 alert("Fail", dev, dv, ainfo);
632 else if (i >= array.raid_disks &&
633 (disc.major || disc.minor) &&
634 st->devid[i] == makedev(disc.major, disc.minor) &&
635 ((newstate&change)&(1<<MD_DISK_FAULTY))
636 )
637 alert("FailSpare", dev, dv, ainfo);
638 else if (i < array.raid_disks &&
639 ! (newstate & (1<<MD_DISK_REMOVED)) &&
640 (((st->devstate[i]&change)&(1<<MD_DISK_FAULTY)) ||
641 ((newstate&change)&(1<<MD_DISK_ACTIVE)) ||
642 ((newstate&change)&(1<<MD_DISK_SYNC)))
643 )
644 alert("SpareActive", dev, dv, ainfo);
645 }
646 st->devstate[i] = newstate;
647 st->devid[i] = makedev(disc.major, disc.minor);
648 }
649 st->active = array.active_disks;
650 st->working = array.working_disks;
651 st->spare = array.spare_disks;
652 st->failed = array.failed_disks;
653 st->utime = array.utime;
654 st->raid = array.raid_disks;
655 st->err = 0;
656 if ((st->active < st->raid) && st->spare == 0)
657 return 1;
658 return 0;
659 }
660
661 static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist,
662 int test, struct alert_info *info)
663 {
664 struct mdstat_ent *mse;
665 int new_found = 0;
666
667 for (mse=mdstat; mse; mse=mse->next)
668 if (mse->devnum != INT_MAX &&
669 (!mse->level || /* retrieve containers */
670 (strcmp(mse->level, "raid0") != 0 &&
671 strcmp(mse->level, "linear") != 0))
672 ) {
673 struct state *st = calloc(1, sizeof *st);
674 mdu_array_info_t array;
675 int fd;
676 if (st == NULL)
677 continue;
678 st->devname = strdup(get_md_name(mse->devnum));
679 if ((fd = open(st->devname, O_RDONLY)) < 0 ||
680 ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
681 /* no such array */
682 if (fd >=0) close(fd);
683 put_md_name(st->devname);
684 free(st->devname);
685 if (st->metadata) {
686 st->metadata->ss->free_super(st->metadata);
687 free(st->metadata);
688 }
689 free(st);
690 continue;
691 }
692 close(fd);
693 st->next = *statelist;
694 st->err = 1;
695 st->devnum = mse->devnum;
696 st->percent = -2;
697 st->expected_spares = -1;
698 if (mse->metadata_version &&
699 strncmp(mse->metadata_version, "external:", 9) == 0 &&
700 is_subarray(mse->metadata_version+9))
701 st->parent_dev =
702 devname2devnum(mse->metadata_version+10);
703 else
704 st->parent_dev = NoMdDev;
705 *statelist = st;
706 if (test)
707 alert("TestMessage", st->devname, NULL, info);
708 alert("NewArray", st->devname, NULL, info);
709 new_found = 1;
710 }
711 return new_found;
712 }
713
714 static int get_min_spare_size_required(struct state *st, unsigned long long *sizep)
715 {
716 int fd;
717
718 if (!st->metadata ||
719 !st->metadata->ss->min_acceptable_spare_size) {
720 *sizep = 0;
721 return 0;
722 }
723
724 fd = open(st->devname, O_RDONLY);
725 if (fd < 0)
726 return 1;
727 if (st->metadata->ss->external)
728 st->metadata->ss->load_container(st->metadata, fd, st->devname);
729 else
730 st->metadata->ss->load_super(st->metadata, fd, st->devname);
731 close(fd);
732 if (!st->metadata->sb)
733 return 1;
734 *sizep = st->metadata->ss->min_acceptable_spare_size(st->metadata);
735 st->metadata->ss->free_super(st->metadata);
736
737 return 0;
738 }
739
740 static int check_donor(struct state *from, struct state *to)
741 {
742 struct state *sub;
743
744 if (from == to)
745 return 0;
746 if (from->parent)
747 /* Cannot move from a member */
748 return 0;
749 if (from->err)
750 return 0;
751 for (sub = from->subarray; sub; sub = sub->subarray)
752 /* If source array has degraded subarrays, don't
753 * remove anything
754 */
755 if (sub->active < sub->raid)
756 return 0;
757 if (from->metadata->ss->external == 0)
758 if (from->active < from->raid)
759 return 0;
760 if (from->spare <= 0)
761 return 0;
762 return 1;
763 }
764
765 static dev_t choose_spare(struct state *from, struct state *to,
766 struct domainlist *domlist, unsigned long long min_size)
767 {
768 int d;
769 dev_t dev = 0;
770
771 for (d = from->raid; !dev && d < MaxDisks; d++) {
772 if (from->devid[d] > 0 &&
773 from->devstate[d] == 0) {
774 struct dev_policy *pol;
775 unsigned long long dev_size;
776
777 if (to->metadata->ss->external &&
778 test_partition_from_id(from->devid[d]))
779 continue;
780
781 if (min_size &&
782 dev_size_from_id(from->devid[d], &dev_size) &&
783 dev_size < min_size)
784 continue;
785
786 pol = devnum_policy(from->devid[d]);
787 if (from->spare_group)
788 pol_add(&pol, pol_domain,
789 from->spare_group, NULL);
790 if (domain_test(domlist, pol, to->metadata->ss->name) == 1)
791 dev = from->devid[d];
792 dev_policy_free(pol);
793 }
794 }
795 return dev;
796 }
797
798 static dev_t container_choose_spare(struct state *from, struct state *to,
799 struct domainlist *domlist,
800 unsigned long long min_size, int active)
801 {
802 /* This is similar to choose_spare, but we cannot trust devstate,
803 * so we need to read the metadata instead
804 */
805 struct mdinfo *list;
806 struct supertype *st = from->metadata;
807 int fd = open(from->devname, O_RDONLY);
808 int err;
809 dev_t dev = 0;
810
811 if (fd < 0)
812 return 0;
813 if (!st->ss->getinfo_super_disks) {
814 close(fd);
815 return 0;
816 }
817
818 err = st->ss->load_container(st, fd, NULL);
819 close(fd);
820 if (err)
821 return 0;
822
823 if (from == to) {
824 /* We must check if number of active disks has not increased
825 * since ioctl in main loop. mdmon may have added spare
826 * to subarray. If so we do not need to look for more spares
827 * so return non zero value */
828 int active_cnt = 0;
829 struct mdinfo *dp;
830 list = st->ss->getinfo_super_disks(st);
831 if (!list) {
832 st->ss->free_super(st);
833 return 1;
834 }
835 dp = list->devs;
836 while (dp) {
837 if (dp->disk.state & (1<<MD_DISK_SYNC) &&
838 !(dp->disk.state & (1<<MD_DISK_FAULTY)))
839 active_cnt++;
840 dp = dp->next;
841 }
842 sysfs_free(list);
843 if (active < active_cnt) {
844 /* Spare just activated.*/
845 st->ss->free_super(st);
846 return 1;
847 }
848 }
849
850 /* We only need one spare so full list not needed */
851 list = container_choose_spares(st, min_size, domlist, from->spare_group,
852 to->metadata->ss->name, 1);
853 if (list) {
854 struct mdinfo *disks = list->devs;
855 if (disks)
856 dev = makedev(disks->disk.major, disks->disk.minor);
857 sysfs_free(list);
858 }
859 st->ss->free_super(st);
860 return dev;
861 }
862
863
864 static void try_spare_migration(struct state *statelist, struct alert_info *info)
865 {
866 struct state *from;
867 struct state *st;
868
869 link_containers_with_subarrays(statelist);
870 for (st = statelist; st; st = st->next)
871 if (st->active < st->raid &&
872 st->spare == 0 && !st->err) {
873 struct domainlist *domlist = NULL;
874 int d;
875 struct state *to = st;
876 unsigned long long min_size;
877
878 if (to->parent_dev != NoMdDev && !to->parent)
879 /* subarray monitored without parent container
880 * we can't move spares here */
881 continue;
882
883 if (to->parent)
884 /* member of a container */
885 to = to->parent;
886
887 if (get_min_spare_size_required(to, &min_size))
888 continue;
889 if (to->metadata->ss->external) {
890 /* We must make sure there is
891 * no suitable spare in container already.
892 * If there is we don't add more */
893 dev_t devid = container_choose_spare(
894 to, to, NULL, min_size, st->active);
895 if (devid > 0)
896 continue;
897 }
898 for (d = 0; d < MaxDisks; d++)
899 if (to->devid[d])
900 domainlist_add_dev(&domlist,
901 to->devid[d],
902 to->metadata->ss->name);
903 if (to->spare_group)
904 domain_add(&domlist, to->spare_group);
905 /*
906 * No spare migration if the destination
907 * has no domain. Skip this array.
908 */
909 if (!domlist)
910 continue;
911 for (from=statelist ; from ; from=from->next) {
912 dev_t devid;
913 if (!check_donor(from, to))
914 continue;
915 if (from->metadata->ss->external)
916 devid = container_choose_spare(
917 from, to, domlist, min_size, 0);
918 else
919 devid = choose_spare(from, to, domlist,
920 min_size);
921 if (devid > 0
922 && move_spare(from->devname, to->devname, devid)) {
923 alert("MoveSpare", to->devname, from->devname, info);
924 break;
925 }
926 }
927 domain_free(domlist);
928 }
929 }
930
931 /* search the statelist to connect external
932 * metadata subarrays with their containers
933 * We always completely rebuild the tree from scratch as
934 * that is safest considering the possibility of entries
935 * disappearing or changing.
936 */
937 static void link_containers_with_subarrays(struct state *list)
938 {
939 struct state *st;
940 struct state *cont;
941 for (st = list; st; st = st->next) {
942 st->parent = NULL;
943 st->subarray = NULL;
944 }
945 for (st = list; st; st = st->next)
946 if (st->parent_dev != NoMdDev)
947 for (cont = list; cont; cont = cont->next)
948 if (!cont->err &&
949 cont->parent_dev == NoMdDev &&
950 cont->devnum == st->parent_dev) {
951 st->parent = cont;
952 st->subarray = cont->subarray;
953 cont->subarray = st;
954 break;
955 }
956 }
957
958 /* Not really Monitor but ... */
959 int Wait(char *dev)
960 {
961 struct stat stb;
962 int devnum;
963 int rv = 1;
964
965 if (stat(dev, &stb) != 0) {
966 fprintf(stderr, Name ": Cannot find %s: %s\n", dev,
967 strerror(errno));
968 return 2;
969 }
970 devnum = stat2devnum(&stb);
971
972 while(1) {
973 struct mdstat_ent *ms = mdstat_read(1, 0);
974 struct mdstat_ent *e;
975
976 for (e=ms ; e; e=e->next)
977 if (e->devnum == devnum)
978 break;
979
980 if (!e || e->percent < 0) {
981 if (e && e->metadata_version &&
982 strncmp(e->metadata_version, "external:", 9) == 0) {
983 if (is_subarray(&e->metadata_version[9]))
984 ping_monitor(&e->metadata_version[9]);
985 else
986 ping_monitor_by_id(devnum);
987 }
988 free_mdstat(ms);
989 return rv;
990 }
991 free_mdstat(ms);
992 rv = 0;
993 mdstat_wait(5);
994 }
995 }
996
997 #ifndef MDASSEMBLE
998
999 static char *clean_states[] = {
1000 "clear", "inactive", "readonly", "read-auto", "clean", NULL };
1001
1002 int WaitClean(char *dev, int sock, int verbose)
1003 {
1004 int fd;
1005 struct mdinfo *mdi;
1006 int rv = 1;
1007 int devnum;
1008
1009 fd = open(dev, O_RDONLY);
1010 if (fd < 0) {
1011 if (verbose)
1012 fprintf(stderr, Name ": Couldn't open %s: %s\n", dev, strerror(errno));
1013 return 1;
1014 }
1015
1016 devnum = fd2devnum(fd);
1017 mdi = sysfs_read(fd, devnum, GET_VERSION|GET_LEVEL|GET_SAFEMODE);
1018 if (!mdi) {
1019 if (verbose)
1020 fprintf(stderr, Name ": Failed to read sysfs attributes for "
1021 "%s\n", dev);
1022 close(fd);
1023 return 0;
1024 }
1025
1026 switch(mdi->array.level) {
1027 case LEVEL_LINEAR:
1028 case LEVEL_MULTIPATH:
1029 case 0:
1030 /* safemode delay is irrelevant for these levels */
1031 rv = 0;
1032 }
1033
1034 /* for internal metadata the kernel handles the final clean
1035 * transition, containers can never be dirty
1036 */
1037 if (!is_subarray(mdi->text_version))
1038 rv = 0;
1039
1040 /* safemode disabled ? */
1041 if (mdi->safe_mode_delay == 0)
1042 rv = 0;
1043
1044 if (rv) {
1045 int state_fd = sysfs_open(fd2devnum(fd), NULL, "array_state");
1046 char buf[20];
1047 fd_set fds;
1048 struct timeval tm;
1049
1050 /* minimize the safe_mode_delay and prepare to wait up to 5s
1051 * for writes to quiesce
1052 */
1053 sysfs_set_safemode(mdi, 1);
1054 tm.tv_sec = 5;
1055 tm.tv_usec = 0;
1056
1057 FD_ZERO(&fds);
1058
1059 /* wait for array_state to be clean */
1060 while (1) {
1061 rv = read(state_fd, buf, sizeof(buf));
1062 if (rv < 0)
1063 break;
1064 if (sysfs_match_word(buf, clean_states) <= 4)
1065 break;
1066 FD_SET(state_fd, &fds);
1067 rv = select(state_fd + 1, NULL, NULL, &fds, &tm);
1068 if (rv < 0 && errno != EINTR)
1069 break;
1070 lseek(state_fd, 0, SEEK_SET);
1071 }
1072 if (rv < 0)
1073 rv = 1;
1074 else if (fping_monitor(sock) == 0 ||
1075 ping_monitor(mdi->text_version) == 0) {
1076 /* we need to ping to close the window between array
1077 * state transitioning to clean and the metadata being
1078 * marked clean
1079 */
1080 rv = 0;
1081 } else
1082 rv = 1;
1083 if (rv && verbose)
1084 fprintf(stderr, Name ": Error waiting for %s to be clean\n",
1085 dev);
1086
1087 /* restore the original safe_mode_delay */
1088 sysfs_set_safemode(mdi, mdi->safe_mode_delay);
1089 close(state_fd);
1090 }
1091
1092 sysfs_free(mdi);
1093 close(fd);
1094
1095 return rv;
1096 }
1097 #endif /* MDASSEMBLE */
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