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Fix RAID metadata check
[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 struct state {
34 char *devname;
35 char devnm[32]; /* to sync with mdstat info */
36 unsigned int utime;
37 int err;
38 char *spare_group;
39 int active, working, failed, spare, raid;
40 int from_config;
41 int from_auto;
42 int expected_spares;
43 int devstate[MAX_DISKS];
44 dev_t devid[MAX_DISKS];
45 int percent;
46 char parent_devnm[32]; /* For subarray, devnm of parent.
47 * For others, ""
48 */
49 struct supertype *metadata;
50 struct state *subarray;/* for a container it is a link to first subarray
51 * for a subarray it is a link to next subarray
52 * in the same container */
53 struct state *parent; /* for a subarray it is a link to its container
54 */
55 struct state *next;
56 };
57
58 struct alert_info {
59 char *mailaddr;
60 char *mailfrom;
61 char *alert_cmd;
62 int dosyslog;
63 };
64 static int make_daemon(char *pidfile);
65 static int check_one_sharer(int scan);
66 static void alert(char *event, char *dev, char *disc, struct alert_info *info);
67 static int check_array(struct state *st, struct mdstat_ent *mdstat,
68 int test, struct alert_info *info,
69 int increments, char *prefer);
70 static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist,
71 int test, struct alert_info *info);
72 static void try_spare_migration(struct state *statelist, struct alert_info *info);
73 static void link_containers_with_subarrays(struct state *list);
74
75 int Monitor(struct mddev_dev *devlist,
76 char *mailaddr, char *alert_cmd,
77 struct context *c,
78 int daemonise, int oneshot,
79 int dosyslog, char *pidfile, int increments,
80 int share)
81 {
82 /*
83 * Every few seconds, scan every md device looking for changes
84 * When a change is found, log it, possibly run the alert command,
85 * and possibly send Email
86 *
87 * For each array, we record:
88 * Update time
89 * active/working/failed/spare drives
90 * State of each device.
91 * %rebuilt if rebuilding
92 *
93 * If the update time changes, check out all the data again
94 * It is possible that we cannot get the state of each device
95 * due to bugs in the md kernel module.
96 * We also read /proc/mdstat to get rebuild percent,
97 * and to get state on all active devices incase of kernel bug.
98 *
99 * Events are:
100 * Fail
101 * An active device had Faulty set or Active/Sync removed
102 * FailSpare
103 * A spare device had Faulty set
104 * SpareActive
105 * An active device had a reverse transition
106 * RebuildStarted
107 * percent went from -1 to +ve
108 * RebuildNN
109 * percent went from below to not-below NN%
110 * DeviceDisappeared
111 * Couldn't access a device which was previously visible
112 *
113 * if we detect an array with active<raid and spare==0
114 * we look at other arrays that have same spare-group
115 * If we find one with active==raid and spare>0,
116 * and if we can get_disk_info and find a name
117 * Then we hot-remove and hot-add to the other array
118 *
119 * If devlist is NULL, then we can monitor everything because --scan
120 * was given. We get an initial list from config file and add anything
121 * that appears in /proc/mdstat
122 */
123
124 struct state *statelist = NULL;
125 struct state *st2;
126 int finished = 0;
127 struct mdstat_ent *mdstat = NULL;
128 char *mailfrom = NULL;
129 struct alert_info info;
130
131 if (!mailaddr) {
132 mailaddr = conf_get_mailaddr();
133 if (mailaddr && ! c->scan)
134 pr_err("Monitor using email address \"%s\" from config file\n",
135 mailaddr);
136 }
137 mailfrom = conf_get_mailfrom();
138
139 if (!alert_cmd) {
140 alert_cmd = conf_get_program();
141 if (alert_cmd && ! c->scan)
142 pr_err("Monitor using program \"%s\" from config file\n",
143 alert_cmd);
144 }
145 if (c->scan && !mailaddr && !alert_cmd && !dosyslog) {
146 pr_err("No mail address or alert command - not monitoring.\n");
147 return 1;
148 }
149 info.alert_cmd = alert_cmd;
150 info.mailaddr = mailaddr;
151 info.mailfrom = mailfrom;
152 info.dosyslog = dosyslog;
153
154 if (daemonise) {
155 int rv = make_daemon(pidfile);
156 if (rv >= 0)
157 return rv;
158 }
159
160 if (share)
161 if (check_one_sharer(c->scan))
162 return 1;
163
164 if (devlist == NULL) {
165 struct mddev_ident *mdlist = conf_get_ident(NULL);
166 for (; mdlist; mdlist=mdlist->next) {
167 struct state *st;
168 if (mdlist->devname == NULL)
169 continue;
170 if (strcasecmp(mdlist->devname, "<ignore>") == 0)
171 continue;
172 st = xcalloc(1, sizeof *st);
173 if (mdlist->devname[0] == '/')
174 st->devname = xstrdup(mdlist->devname);
175 else {
176 st->devname = xmalloc(8+strlen(mdlist->devname)+1);
177 strcpy(strcpy(st->devname, "/dev/md/"),
178 mdlist->devname);
179 }
180 st->next = statelist;
181 st->devnm[0] = 0;
182 st->percent = RESYNC_UNKNOWN;
183 st->from_config = 1;
184 st->expected_spares = mdlist->spare_disks;
185 if (mdlist->spare_group)
186 st->spare_group = xstrdup(mdlist->spare_group);
187 statelist = st;
188 }
189 } else {
190 struct mddev_dev *dv;
191 for (dv=devlist ; dv; dv=dv->next) {
192 struct mddev_ident *mdlist = conf_get_ident(dv->devname);
193 struct state *st = xcalloc(1, sizeof *st);
194 st->devname = xstrdup(dv->devname);
195 st->next = statelist;
196 st->devnm[0] = 0;
197 st->percent = RESYNC_UNKNOWN;
198 st->expected_spares = -1;
199 if (mdlist) {
200 st->expected_spares = mdlist->spare_disks;
201 if (mdlist->spare_group)
202 st->spare_group = xstrdup(mdlist->spare_group);
203 }
204 statelist = st;
205 }
206 }
207
208 while (! finished) {
209 int new_found = 0;
210 struct state *st, **stp;
211 int anydegraded = 0;
212
213 if (mdstat)
214 free_mdstat(mdstat);
215 mdstat = mdstat_read(oneshot?0:1, 0);
216 if (!mdstat)
217 mdstat_close();
218
219 for (st=statelist; st; st=st->next)
220 if (check_array(st, mdstat, c->test, &info,
221 increments, c->prefer))
222 anydegraded = 1;
223
224 /* now check if there are any new devices found in mdstat */
225 if (c->scan)
226 new_found = add_new_arrays(mdstat, &statelist, c->test,
227 &info);
228
229 /* If an array has active < raid && spare == 0 && spare_group != NULL
230 * Look for another array with spare > 0 and active == raid and same spare_group
231 * if found, choose a device and hotremove/hotadd
232 */
233 if (share && anydegraded)
234 try_spare_migration(statelist, &info);
235 if (!new_found) {
236 if (oneshot)
237 break;
238 else
239 mdstat_wait(c->delay);
240 }
241 c->test = 0;
242
243 for (stp = &statelist; (st = *stp) != NULL; ) {
244 if (st->from_auto && st->err > 5) {
245 *stp = st->next;
246 free(st->devname);
247 free(st->spare_group);
248 free(st);
249 } else
250 stp = &st->next;
251 }
252 }
253 for (st2 = statelist; st2; st2 = statelist) {
254 statelist = st2->next;
255 free(st2);
256 }
257
258 if (pidfile)
259 unlink(pidfile);
260 return 0;
261 }
262
263 static int make_daemon(char *pidfile)
264 {
265 /* Return:
266 * -1 in the forked daemon
267 * 0 in the parent
268 * 1 on error
269 * so a none-negative becomes the exit code.
270 */
271 int pid = fork();
272 if (pid > 0) {
273 if (!pidfile)
274 printf("%d\n", pid);
275 else {
276 FILE *pid_file;
277 pid_file=fopen(pidfile, "w");
278 if (!pid_file)
279 perror("cannot create pid file");
280 else {
281 fprintf(pid_file,"%d\n", pid);
282 fclose(pid_file);
283 }
284 }
285 return 0;
286 }
287 if (pid < 0) {
288 perror("daemonise");
289 return 1;
290 }
291 close(0);
292 open("/dev/null", O_RDWR);
293 dup2(0,1);
294 dup2(0,2);
295 setsid();
296 return -1;
297 }
298
299 static int check_one_sharer(int scan)
300 {
301 int pid, rv;
302 FILE *fp;
303 char dir[20];
304 char path[100];
305 struct stat buf;
306 sprintf(path, "%s/autorebuild.pid", MDMON_DIR);
307 fp = fopen(path, "r");
308 if (fp) {
309 if (fscanf(fp, "%d", &pid) != 1)
310 pid = -1;
311 sprintf(dir, "/proc/%d", pid);
312 rv = stat(dir, &buf);
313 if (rv != -1) {
314 if (scan) {
315 pr_err("Only one autorebuild process allowed in scan mode, aborting\n");
316 fclose(fp);
317 return 1;
318 } else {
319 pr_err("Warning: One autorebuild process already running.\n");
320 }
321 }
322 fclose(fp);
323 }
324 if (scan) {
325 if (mkdir(MDMON_DIR, S_IRWXU) < 0 &&
326 errno != EEXIST) {
327 pr_err("Can't create autorebuild.pid file\n");
328 } else {
329 fp = fopen(path, "w");
330 if (!fp)
331 pr_err("Cannot create autorebuild.pidfile\n");
332 else {
333 pid = getpid();
334 fprintf(fp, "%d\n", pid);
335 fclose(fp);
336 }
337 }
338 }
339 return 0;
340 }
341
342 static void alert(char *event, char *dev, char *disc, struct alert_info *info)
343 {
344 int priority;
345
346 if (!info->alert_cmd && !info->mailaddr && !info->dosyslog) {
347 time_t now = time(0);
348
349 printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
350 }
351 if (info->alert_cmd) {
352 int pid = fork();
353 switch(pid) {
354 default:
355 waitpid(pid, NULL, 0);
356 break;
357 case -1:
358 break;
359 case 0:
360 execl(info->alert_cmd, info->alert_cmd,
361 event, dev, disc, NULL);
362 exit(2);
363 }
364 }
365 if (info->mailaddr &&
366 (strncmp(event, "Fail", 4)==0 ||
367 strncmp(event, "Test", 4)==0 ||
368 strncmp(event, "Spares", 6)==0 ||
369 strncmp(event, "Degrade", 7)==0)) {
370 FILE *mp = popen(Sendmail, "w");
371 if (mp) {
372 FILE *mdstat;
373 char hname[256];
374 gethostname(hname, sizeof(hname));
375 signal(SIGPIPE, SIG_IGN);
376 if (info->mailfrom)
377 fprintf(mp, "From: %s\n", info->mailfrom);
378 else
379 fprintf(mp, "From: %s monitoring <root>\n", Name);
380 fprintf(mp, "To: %s\n", info->mailaddr);
381 fprintf(mp, "Subject: %s event on %s:%s\n\n",
382 event, dev, hname);
383
384 fprintf(mp,
385 "This is an automatically generated mail message from %s\n", Name);
386 fprintf(mp, "running on %s\n\n", hname);
387
388 fprintf(mp,
389 "A %s event had been detected on md device %s.\n\n", event, dev);
390
391 if (disc && disc[0] != ' ')
392 fprintf(mp,
393 "It could be related to component device %s.\n\n", disc);
394 if (disc && disc[0] == ' ')
395 fprintf(mp, "Extra information:%s.\n\n", disc);
396
397 fprintf(mp, "Faithfully yours, etc.\n");
398
399 mdstat = fopen("/proc/mdstat", "r");
400 if (mdstat) {
401 char buf[8192];
402 int n;
403 fprintf(mp,
404 "\nP.S. The /proc/mdstat file currently contains the following:\n\n");
405 while ( (n=fread(buf, 1, sizeof(buf), mdstat)) > 0)
406 n=fwrite(buf, 1, n, mp);
407 fclose(mdstat);
408 }
409 pclose(mp);
410 }
411 }
412
413 /* log the event to syslog maybe */
414 if (info->dosyslog) {
415 /* Log at a different severity depending on the event.
416 *
417 * These are the critical events: */
418 if (strncmp(event, "Fail", 4)==0 ||
419 strncmp(event, "Degrade", 7)==0 ||
420 strncmp(event, "DeviceDisappeared", 17)==0)
421 priority = LOG_CRIT;
422 /* Good to know about, but are not failures: */
423 else if (strncmp(event, "Rebuild", 7)==0 ||
424 strncmp(event, "MoveSpare", 9)==0 ||
425 strncmp(event, "Spares", 6) != 0)
426 priority = LOG_WARNING;
427 /* Everything else: */
428 else
429 priority = LOG_INFO;
430
431 if (disc && disc[0] != ' ')
432 syslog(priority,
433 "%s event detected on md device %s, component device %s", event, dev, disc);
434 else if (disc)
435 syslog(priority,
436 "%s event detected on md device %s: %s",
437 event, dev, disc);
438 else
439 syslog(priority,
440 "%s event detected on md device %s",
441 event, dev);
442 }
443 }
444
445 static int check_array(struct state *st, struct mdstat_ent *mdstat,
446 int test, struct alert_info *ainfo,
447 int increments, char *prefer)
448 {
449 /* Update the state 'st' to reflect any changes shown in mdstat,
450 * or found by directly examining the array, and return
451 * '1' if the array is degraded, or '0' if it is optimal (or dead).
452 */
453 struct { int state, major, minor; } info[MAX_DISKS];
454 mdu_array_info_t array;
455 struct mdstat_ent *mse = NULL, *mse2;
456 char *dev = st->devname;
457 int fd = -1;
458 int i;
459 int remaining_disks;
460 int last_disk;
461 int new_array = 0;
462
463 if (test)
464 alert("TestMessage", dev, NULL, ainfo);
465 if (st->devnm[0])
466 fd = open("/sys/block", O_RDONLY|O_DIRECTORY);
467 if (fd >= 0) {
468 /* Don't open the device unless it is present and
469 * active in sysfs.
470 */
471 char buf[10];
472 close(fd);
473 fd = sysfs_open(st->devnm, NULL, "array_state");
474 if (fd < 0 ||
475 read(fd, buf, 10) < 5 ||
476 strncmp(buf,"clear",5) == 0 ||
477 strncmp(buf,"inact",5) == 0) {
478 if (fd >= 0)
479 close(fd);
480 fd = sysfs_open(st->devnm, NULL, "level");
481 if (fd < 0 || read(fd, buf, 10) != 0) {
482 if (fd >= 0)
483 close(fd);
484 if (!st->err)
485 alert("DeviceDisappeared", dev, NULL, ainfo);
486 st->err++;
487 return 0;
488 }
489 }
490 close(fd);
491 }
492 fd = open(dev, O_RDONLY);
493 if (fd < 0) {
494 if (!st->err)
495 alert("DeviceDisappeared", dev, NULL, ainfo);
496 st->err++;
497 return 0;
498 }
499 fcntl(fd, F_SETFD, FD_CLOEXEC);
500 if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
501 if (!st->err)
502 alert("DeviceDisappeared", dev, NULL, ainfo);
503 st->err++;
504 close(fd);
505 return 0;
506 }
507 /* It's much easier to list what array levels can't
508 * have a device disappear than all of them that can
509 */
510 if (array.level == 0 || array.level == -1) {
511 if (!st->err && !st->from_config)
512 alert("DeviceDisappeared", dev, " Wrong-Level", ainfo);
513 st->err++;
514 close(fd);
515 return 0;
516 }
517 if (st->devnm[0] == 0)
518 strcpy(st->devnm, fd2devnm(fd));
519
520 for (mse2 = mdstat ; mse2 ; mse2=mse2->next)
521 if (strcmp(mse2->devnm, st->devnm) == 0) {
522 mse2->devnm[0] = 0; /* flag it as "used" */
523 mse = mse2;
524 }
525
526 if (!mse) {
527 /* duplicated array in statelist
528 * or re-created after reading mdstat*/
529 st->err++;
530 close(fd);
531 return 0;
532 }
533 /* this array is in /proc/mdstat */
534 if (array.utime == 0)
535 /* external arrays don't update utime, so
536 * just make sure it is always different. */
537 array.utime = st->utime + 1;;
538
539 if (st->err) {
540 /* New array appeared where previously had an error */
541 st->err = 0;
542 st->percent = RESYNC_NONE;
543 new_array = 1;
544 alert("NewArray", st->devname, NULL, ainfo);
545 }
546
547 if (st->utime == array.utime &&
548 st->failed == array.failed_disks &&
549 st->working == array.working_disks &&
550 st->spare == array.spare_disks &&
551 (mse == NULL || (
552 mse->percent == st->percent
553 ))) {
554 close(fd);
555 if ((st->active < st->raid) && st->spare == 0)
556 return 1;
557 else
558 return 0;
559 }
560 if (st->utime == 0 && /* new array */
561 mse->pattern && strchr(mse->pattern, '_') /* degraded */
562 )
563 alert("DegradedArray", dev, NULL, ainfo);
564
565 if (st->utime == 0 && /* new array */
566 st->expected_spares > 0 &&
567 array.spare_disks < st->expected_spares)
568 alert("SparesMissing", dev, NULL, ainfo);
569 if (st->percent < 0 && st->percent != RESYNC_UNKNOWN &&
570 mse->percent >= 0)
571 alert("RebuildStarted", dev, NULL, ainfo);
572 if (st->percent >= 0 &&
573 mse->percent >= 0 &&
574 (mse->percent / increments) > (st->percent / increments)) {
575 char percentalert[15]; // "RebuildNN" (10 chars) or "RebuildStarted" (15 chars)
576
577 if((mse->percent / increments) == 0)
578 snprintf(percentalert, sizeof(percentalert), "RebuildStarted");
579 else
580 snprintf(percentalert, sizeof(percentalert), "Rebuild%02d", mse->percent);
581
582 alert(percentalert, dev, NULL, ainfo);
583 }
584
585 if (mse->percent == RESYNC_NONE &&
586 st->percent >= 0) {
587 /* Rebuild/sync/whatever just finished.
588 * If there is a number in /mismatch_cnt,
589 * we should report that.
590 */
591 struct mdinfo *sra =
592 sysfs_read(-1, st->devnm, GET_MISMATCH);
593 if (sra && sra->mismatch_cnt > 0) {
594 char cnt[80];
595 snprintf(cnt, sizeof(cnt),
596 " mismatches found: %d (on raid level %d)",
597 sra->mismatch_cnt, array.level);
598 alert("RebuildFinished", dev, cnt, ainfo);
599 } else
600 alert("RebuildFinished", dev, NULL, ainfo);
601 if (sra)
602 sysfs_free(sra);
603 }
604 st->percent = mse->percent;
605
606 remaining_disks = array.nr_disks;
607 for (i=0; i<MAX_DISKS && remaining_disks > 0;
608 i++) {
609 mdu_disk_info_t disc;
610 disc.number = i;
611 if (ioctl(fd, GET_DISK_INFO, &disc) >= 0) {
612 info[i].state = disc.state;
613 info[i].major = disc.major;
614 info[i].minor = disc.minor;
615 if (disc.major || disc.minor)
616 remaining_disks --;
617 } else
618 info[i].major = info[i].minor = 0;
619 }
620 last_disk = i;
621
622 if (mse->metadata_version &&
623 strncmp(mse->metadata_version, "external:", 9) == 0 &&
624 is_subarray(mse->metadata_version+9)) {
625 char *sl;
626 strcpy(st->parent_devnm,
627 mse->metadata_version+10);
628 sl = strchr(st->parent_devnm, '/');
629 if (sl)
630 *sl = 0;
631 } else
632 st->parent_devnm[0] = 0;
633 if (st->metadata == NULL &&
634 st->parent_devnm[0] == 0)
635 st->metadata = super_by_fd(fd, NULL);
636
637 close(fd);
638
639 for (i=0; i<MAX_DISKS; i++) {
640 mdu_disk_info_t disc = {0,0,0,0,0};
641 int newstate=0;
642 int change;
643 char *dv = NULL;
644 disc.number = i;
645 if (i < last_disk &&
646 (info[i].major || info[i].minor)) {
647 newstate = info[i].state;
648 dv = map_dev_preferred(
649 info[i].major, info[i].minor, 1,
650 prefer);
651 disc.state = newstate;
652 disc.major = info[i].major;
653 disc.minor = info[i].minor;
654 } else
655 newstate = (1 << MD_DISK_REMOVED);
656
657 if (dv == NULL && st->devid[i])
658 dv = map_dev_preferred(
659 major(st->devid[i]),
660 minor(st->devid[i]), 1, prefer);
661 change = newstate ^ st->devstate[i];
662 if (st->utime && change && !st->err && !new_array) {
663 if ((st->devstate[i]&change)&(1<<MD_DISK_SYNC))
664 alert("Fail", dev, dv, ainfo);
665 else if ((newstate & (1<<MD_DISK_FAULTY)) &&
666 (disc.major || disc.minor) &&
667 st->devid[i] == makedev(disc.major, disc.minor))
668 alert("FailSpare", dev, dv, ainfo);
669 else if ((newstate&change)&(1<<MD_DISK_SYNC))
670 alert("SpareActive", dev, dv, ainfo);
671 }
672 st->devstate[i] = newstate;
673 st->devid[i] = makedev(disc.major, disc.minor);
674 }
675 st->active = array.active_disks;
676 st->working = array.working_disks;
677 st->spare = array.spare_disks;
678 st->failed = array.failed_disks;
679 st->utime = array.utime;
680 st->raid = array.raid_disks;
681 st->err = 0;
682 if ((st->active < st->raid) && st->spare == 0)
683 return 1;
684 return 0;
685 }
686
687 static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist,
688 int test, struct alert_info *info)
689 {
690 struct mdstat_ent *mse;
691 int new_found = 0;
692 char *name;
693
694 for (mse=mdstat; mse; mse=mse->next)
695 if (mse->devnm[0] &&
696 (!mse->level || /* retrieve containers */
697 (strcmp(mse->level, "raid0") != 0 &&
698 strcmp(mse->level, "linear") != 0))
699 ) {
700 struct state *st = xcalloc(1, sizeof *st);
701 mdu_array_info_t array;
702 int fd;
703
704 name = get_md_name(mse->devnm);
705 if (!name) {
706 free(st);
707 continue;
708 }
709
710 st->devname = xstrdup(name);
711 if ((fd = open(st->devname, O_RDONLY)) < 0 ||
712 ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
713 /* no such array */
714 if (fd >=0) close(fd);
715 put_md_name(st->devname);
716 free(st->devname);
717 if (st->metadata) {
718 st->metadata->ss->free_super(st->metadata);
719 free(st->metadata);
720 }
721 free(st);
722 continue;
723 }
724 close(fd);
725 st->next = *statelist;
726 st->err = 1;
727 st->from_auto = 1;
728 strcpy(st->devnm, mse->devnm);
729 st->percent = RESYNC_UNKNOWN;
730 st->expected_spares = -1;
731 if (mse->metadata_version &&
732 strncmp(mse->metadata_version, "external:", 9) == 0 &&
733 is_subarray(mse->metadata_version+9)) {
734 char *sl;
735 strcpy(st->parent_devnm,
736 mse->metadata_version+10);
737 sl = strchr(st->parent_devnm, '/');
738 *sl = 0;
739 } else
740 st->parent_devnm[0] = 0;
741 *statelist = st;
742 if (test)
743 alert("TestMessage", st->devname, NULL, info);
744 new_found = 1;
745 }
746 return new_found;
747 }
748
749 static int get_min_spare_size_required(struct state *st, unsigned long long *sizep)
750 {
751 int fd;
752
753 if (!st->metadata ||
754 !st->metadata->ss->min_acceptable_spare_size) {
755 *sizep = 0;
756 return 0;
757 }
758
759 fd = open(st->devname, O_RDONLY);
760 if (fd < 0)
761 return 1;
762 if (st->metadata->ss->external)
763 st->metadata->ss->load_container(st->metadata, fd, st->devname);
764 else
765 st->metadata->ss->load_super(st->metadata, fd, st->devname);
766 close(fd);
767 if (!st->metadata->sb)
768 return 1;
769 *sizep = st->metadata->ss->min_acceptable_spare_size(st->metadata);
770 st->metadata->ss->free_super(st->metadata);
771
772 return 0;
773 }
774
775 static int check_donor(struct state *from, struct state *to)
776 {
777 struct state *sub;
778
779 if (from == to)
780 return 0;
781 if (from->parent)
782 /* Cannot move from a member */
783 return 0;
784 if (from->err)
785 return 0;
786 for (sub = from->subarray; sub; sub = sub->subarray)
787 /* If source array has degraded subarrays, don't
788 * remove anything
789 */
790 if (sub->active < sub->raid)
791 return 0;
792 if (from->metadata->ss->external == 0)
793 if (from->active < from->raid)
794 return 0;
795 if (from->spare <= 0)
796 return 0;
797 return 1;
798 }
799
800 static dev_t choose_spare(struct state *from, struct state *to,
801 struct domainlist *domlist, unsigned long long min_size)
802 {
803 int d;
804 dev_t dev = 0;
805
806 for (d = from->raid; !dev && d < MAX_DISKS; d++) {
807 if (from->devid[d] > 0 &&
808 from->devstate[d] == 0) {
809 struct dev_policy *pol;
810 unsigned long long dev_size;
811
812 if (to->metadata->ss->external &&
813 test_partition_from_id(from->devid[d]))
814 continue;
815
816 if (min_size &&
817 dev_size_from_id(from->devid[d], &dev_size) &&
818 dev_size < min_size)
819 continue;
820
821 pol = devid_policy(from->devid[d]);
822 if (from->spare_group)
823 pol_add(&pol, pol_domain,
824 from->spare_group, NULL);
825 if (domain_test(domlist, pol, to->metadata->ss->name) == 1)
826 dev = from->devid[d];
827 dev_policy_free(pol);
828 }
829 }
830 return dev;
831 }
832
833 static dev_t container_choose_spare(struct state *from, struct state *to,
834 struct domainlist *domlist,
835 unsigned long long min_size, int active)
836 {
837 /* This is similar to choose_spare, but we cannot trust devstate,
838 * so we need to read the metadata instead
839 */
840 struct mdinfo *list;
841 struct supertype *st = from->metadata;
842 int fd = open(from->devname, O_RDONLY);
843 int err;
844 dev_t dev = 0;
845
846 if (fd < 0)
847 return 0;
848 if (!st->ss->getinfo_super_disks) {
849 close(fd);
850 return 0;
851 }
852
853 err = st->ss->load_container(st, fd, NULL);
854 close(fd);
855 if (err)
856 return 0;
857
858 if (from == to) {
859 /* We must check if number of active disks has not increased
860 * since ioctl in main loop. mdmon may have added spare
861 * to subarray. If so we do not need to look for more spares
862 * so return non zero value */
863 int active_cnt = 0;
864 struct mdinfo *dp;
865 list = st->ss->getinfo_super_disks(st);
866 if (!list) {
867 st->ss->free_super(st);
868 return 1;
869 }
870 dp = list->devs;
871 while (dp) {
872 if (dp->disk.state & (1<<MD_DISK_SYNC) &&
873 !(dp->disk.state & (1<<MD_DISK_FAULTY)))
874 active_cnt++;
875 dp = dp->next;
876 }
877 sysfs_free(list);
878 if (active < active_cnt) {
879 /* Spare just activated.*/
880 st->ss->free_super(st);
881 return 1;
882 }
883 }
884
885 /* We only need one spare so full list not needed */
886 list = container_choose_spares(st, min_size, domlist, from->spare_group,
887 to->metadata->ss->name, 1);
888 if (list) {
889 struct mdinfo *disks = list->devs;
890 if (disks)
891 dev = makedev(disks->disk.major, disks->disk.minor);
892 sysfs_free(list);
893 }
894 st->ss->free_super(st);
895 return dev;
896 }
897
898 static void try_spare_migration(struct state *statelist, struct alert_info *info)
899 {
900 struct state *from;
901 struct state *st;
902
903 link_containers_with_subarrays(statelist);
904 for (st = statelist; st; st = st->next)
905 if (st->active < st->raid &&
906 st->spare == 0 && !st->err) {
907 struct domainlist *domlist = NULL;
908 int d;
909 struct state *to = st;
910 unsigned long long min_size;
911
912 if (to->parent_devnm[0] && !to->parent)
913 /* subarray monitored without parent container
914 * we can't move spares here */
915 continue;
916
917 if (to->parent)
918 /* member of a container */
919 to = to->parent;
920
921 if (get_min_spare_size_required(to, &min_size))
922 continue;
923 if (to->metadata->ss->external) {
924 /* We must make sure there is
925 * no suitable spare in container already.
926 * If there is we don't add more */
927 dev_t devid = container_choose_spare(
928 to, to, NULL, min_size, st->active);
929 if (devid > 0)
930 continue;
931 }
932 for (d = 0; d < MAX_DISKS; d++)
933 if (to->devid[d])
934 domainlist_add_dev(&domlist,
935 to->devid[d],
936 to->metadata->ss->name);
937 if (to->spare_group)
938 domain_add(&domlist, to->spare_group);
939 /*
940 * No spare migration if the destination
941 * has no domain. Skip this array.
942 */
943 if (!domlist)
944 continue;
945 for (from=statelist ; from ; from=from->next) {
946 dev_t devid;
947 if (!check_donor(from, to))
948 continue;
949 if (from->metadata->ss->external)
950 devid = container_choose_spare(
951 from, to, domlist, min_size, 0);
952 else
953 devid = choose_spare(from, to, domlist,
954 min_size);
955 if (devid > 0
956 && move_spare(from->devname, to->devname, devid)) {
957 alert("MoveSpare", to->devname, from->devname, info);
958 break;
959 }
960 }
961 domain_free(domlist);
962 }
963 }
964
965 /* search the statelist to connect external
966 * metadata subarrays with their containers
967 * We always completely rebuild the tree from scratch as
968 * that is safest considering the possibility of entries
969 * disappearing or changing.
970 */
971 static void link_containers_with_subarrays(struct state *list)
972 {
973 struct state *st;
974 struct state *cont;
975 for (st = list; st; st = st->next) {
976 st->parent = NULL;
977 st->subarray = NULL;
978 }
979 for (st = list; st; st = st->next)
980 if (st->parent_devnm[0])
981 for (cont = list; cont; cont = cont->next)
982 if (!cont->err &&
983 cont->parent_devnm[0] == 0 &&
984 strcmp(cont->devnm, st->parent_devnm) == 0) {
985 st->parent = cont;
986 st->subarray = cont->subarray;
987 cont->subarray = st;
988 break;
989 }
990 }
991
992 /* Not really Monitor but ... */
993 int Wait(char *dev)
994 {
995 struct stat stb;
996 char devnm[32];
997 int rv = 1;
998 int frozen_remaining = 3;
999
1000 if (stat(dev, &stb) != 0) {
1001 pr_err("Cannot find %s: %s\n", dev,
1002 strerror(errno));
1003 return 2;
1004 }
1005 strcpy(devnm, stat2devnm(&stb));
1006
1007 while(1) {
1008 struct mdstat_ent *ms = mdstat_read(1, 0);
1009 struct mdstat_ent *e;
1010
1011 for (e=ms ; e; e=e->next)
1012 if (strcmp(e->devnm, devnm) == 0)
1013 break;
1014
1015 if (e && e->percent == RESYNC_NONE) {
1016 /* We could be in the brief pause before something
1017 * starts. /proc/mdstat doesn't show that, but
1018 * sync_action does.
1019 */
1020 struct mdinfo mdi;
1021 char buf[21];
1022 sysfs_init(&mdi, -1, devnm);
1023 if (sysfs_get_str(&mdi, NULL, "sync_action",
1024 buf, 20) > 0 &&
1025 strcmp(buf,"idle\n") != 0) {
1026 e->percent = RESYNC_UNKNOWN;
1027 if (strcmp(buf, "frozen\n") == 0) {
1028 if (frozen_remaining == 0)
1029 e->percent = RESYNC_NONE;
1030 else
1031 frozen_remaining -= 1;
1032 }
1033 }
1034 }
1035 if (!e || e->percent == RESYNC_NONE) {
1036 if (e && e->metadata_version &&
1037 strncmp(e->metadata_version, "external:", 9) == 0) {
1038 if (is_subarray(&e->metadata_version[9]))
1039 ping_monitor(&e->metadata_version[9]);
1040 else
1041 ping_monitor(devnm);
1042 }
1043 free_mdstat(ms);
1044 return rv;
1045 }
1046 free_mdstat(ms);
1047 rv = 0;
1048 mdstat_wait(5);
1049 }
1050 }
1051
1052 #ifndef MDASSEMBLE
1053
1054 static char *clean_states[] = {
1055 "clear", "inactive", "readonly", "read-auto", "clean", NULL };
1056
1057 int WaitClean(char *dev, int sock, int verbose)
1058 {
1059 int fd;
1060 struct mdinfo *mdi;
1061 int rv = 1;
1062 char devnm[32];
1063
1064 fd = open(dev, O_RDONLY);
1065 if (fd < 0) {
1066 if (verbose)
1067 pr_err("Couldn't open %s: %s\n", dev, strerror(errno));
1068 return 1;
1069 }
1070
1071 strcpy(devnm, fd2devnm(fd));
1072 mdi = sysfs_read(fd, devnm, GET_VERSION|GET_LEVEL|GET_SAFEMODE);
1073 if (!mdi) {
1074 if (verbose)
1075 pr_err("Failed to read sysfs attributes for %s\n", dev);
1076 close(fd);
1077 return 0;
1078 }
1079
1080 switch(mdi->array.level) {
1081 case LEVEL_LINEAR:
1082 case LEVEL_MULTIPATH:
1083 case 0:
1084 /* safemode delay is irrelevant for these levels */
1085 rv = 0;
1086 }
1087
1088 /* for internal metadata the kernel handles the final clean
1089 * transition, containers can never be dirty
1090 */
1091 if (!is_subarray(mdi->text_version))
1092 rv = 0;
1093
1094 /* safemode disabled ? */
1095 if (mdi->safe_mode_delay == 0)
1096 rv = 0;
1097
1098 if (rv) {
1099 int state_fd = sysfs_open(fd2devnm(fd), NULL, "array_state");
1100 char buf[20];
1101 int delay = 5000;
1102
1103 /* minimize the safe_mode_delay and prepare to wait up to 5s
1104 * for writes to quiesce
1105 */
1106 sysfs_set_safemode(mdi, 1);
1107
1108 /* wait for array_state to be clean */
1109 while (1) {
1110 rv = read(state_fd, buf, sizeof(buf));
1111 if (rv < 0)
1112 break;
1113 if (sysfs_match_word(buf, clean_states) <= 4)
1114 break;
1115 rv = sysfs_wait(state_fd, &delay);
1116 if (rv < 0 && errno != EINTR)
1117 break;
1118 lseek(state_fd, 0, SEEK_SET);
1119 }
1120 if (rv < 0)
1121 rv = 1;
1122 else if (fping_monitor(sock) == 0 ||
1123 ping_monitor(mdi->text_version) == 0) {
1124 /* we need to ping to close the window between array
1125 * state transitioning to clean and the metadata being
1126 * marked clean
1127 */
1128 rv = 0;
1129 } else
1130 rv = 1;
1131 if (rv && verbose)
1132 pr_err("Error waiting for %s to be clean\n",
1133 dev);
1134
1135 /* restore the original safe_mode_delay */
1136 sysfs_set_safemode(mdi, mdi->safe_mode_delay);
1137 close(state_fd);
1138 }
1139
1140 sysfs_free(mdi);
1141 close(fd);
1142
1143 return rv;
1144 }
1145 #endif /* MDASSEMBLE */
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