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Monitor: improve check_one_sharer() for checking duplicated process
[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;
129 struct alert_info info;
130 struct mddev_ident *mdlist;
131
132 if (!mailaddr) {
133 mailaddr = conf_get_mailaddr();
134 if (mailaddr && ! c->scan)
135 pr_err("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 && !c->scan)
143 pr_err("Monitor using program \"%s\" from config file\n",
144 alert_cmd);
145 }
146 if (c->scan && !mailaddr && !alert_cmd && !dosyslog) {
147 pr_err("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(c->scan))
163 return 1;
164
165 if (devlist == NULL) {
166 mdlist = conf_get_ident(NULL);
167 for (; mdlist; mdlist = mdlist->next) {
168 struct state *st;
169
170 if (mdlist->devname == NULL)
171 continue;
172 if (strcasecmp(mdlist->devname, "<ignore>") == 0)
173 continue;
174 st = xcalloc(1, sizeof *st);
175 if (mdlist->devname[0] == '/')
176 st->devname = xstrdup(mdlist->devname);
177 else {
178 st->devname = xmalloc(8+strlen(mdlist->devname)+1);
179 strcpy(strcpy(st->devname, "/dev/md/"),
180 mdlist->devname);
181 }
182 st->next = statelist;
183 st->devnm[0] = 0;
184 st->percent = RESYNC_UNKNOWN;
185 st->from_config = 1;
186 st->expected_spares = mdlist->spare_disks;
187 if (mdlist->spare_group)
188 st->spare_group = xstrdup(mdlist->spare_group);
189 statelist = st;
190 }
191 } else {
192 struct mddev_dev *dv;
193
194 for (dv = devlist; dv; dv = dv->next) {
195 struct state *st = xcalloc(1, sizeof *st);
196 mdlist = conf_get_ident(dv->devname);
197 st->devname = xstrdup(dv->devname);
198 st->next = statelist;
199 st->devnm[0] = 0;
200 st->percent = RESYNC_UNKNOWN;
201 st->expected_spares = -1;
202 if (mdlist) {
203 st->expected_spares = mdlist->spare_disks;
204 if (mdlist->spare_group)
205 st->spare_group = xstrdup(mdlist->spare_group);
206 }
207 statelist = st;
208 }
209 }
210
211 while (!finished) {
212 int new_found = 0;
213 struct state *st, **stp;
214 int anydegraded = 0;
215
216 if (mdstat)
217 free_mdstat(mdstat);
218 mdstat = mdstat_read(oneshot ? 0 : 1, 0);
219 if (!mdstat)
220 mdstat_close();
221
222 for (st = statelist; st; st = st->next)
223 if (check_array(st, mdstat, c->test, &info,
224 increments, c->prefer))
225 anydegraded = 1;
226
227 /* now check if there are any new devices found in mdstat */
228 if (c->scan)
229 new_found = add_new_arrays(mdstat, &statelist, c->test,
230 &info);
231
232 /* If an array has active < raid && spare == 0 && spare_group != NULL
233 * Look for another array with spare > 0 and active == raid and same spare_group
234 * if found, choose a device and hotremove/hotadd
235 */
236 if (share && anydegraded)
237 try_spare_migration(statelist, &info);
238 if (!new_found) {
239 if (oneshot)
240 break;
241 else
242 mdstat_wait(c->delay);
243 }
244 c->test = 0;
245
246 for (stp = &statelist; (st = *stp) != NULL; ) {
247 if (st->from_auto && st->err > 5) {
248 *stp = st->next;
249 free(st->devname);
250 free(st->spare_group);
251 free(st);
252 } else
253 stp = &st->next;
254 }
255 }
256 for (st2 = statelist; st2; st2 = statelist) {
257 statelist = st2->next;
258 free(st2);
259 }
260
261 if (pidfile)
262 unlink(pidfile);
263 return 0;
264 }
265
266 static int make_daemon(char *pidfile)
267 {
268 /* Return:
269 * -1 in the forked daemon
270 * 0 in the parent
271 * 1 on error
272 * so a none-negative becomes the exit code.
273 */
274 int pid = fork();
275 if (pid > 0) {
276 if (!pidfile)
277 printf("%d\n", pid);
278 else {
279 FILE *pid_file;
280 pid_file=fopen(pidfile, "w");
281 if (!pid_file)
282 perror("cannot create pid file");
283 else {
284 fprintf(pid_file,"%d\n", pid);
285 fclose(pid_file);
286 }
287 }
288 return 0;
289 }
290 if (pid < 0) {
291 perror("daemonise");
292 return 1;
293 }
294 close(0);
295 open("/dev/null", O_RDWR);
296 dup2(0, 1);
297 dup2(0, 2);
298 setsid();
299 return -1;
300 }
301
302 static int check_one_sharer(int scan)
303 {
304 int pid;
305 FILE *comm_fp;
306 FILE *fp;
307 char comm_path[100];
308 char path[100];
309 char comm[20];
310
311 sprintf(path, "%s/autorebuild.pid", MDMON_DIR);
312 fp = fopen(path, "r");
313 if (fp) {
314 if (fscanf(fp, "%d", &pid) != 1)
315 pid = -1;
316 snprintf(comm_path, sizeof(comm_path),
317 "/proc/%d/comm", pid);
318 comm_fp = fopen(comm_path, "r");
319 if (comm_fp) {
320 if (fscanf(comm_fp, "%s", comm) &&
321 strncmp(basename(comm), Name, strlen(Name)) == 0) {
322 if (scan) {
323 pr_err("Only one autorebuild process allowed in scan mode, aborting\n");
324 fclose(comm_fp);
325 fclose(fp);
326 return 1;
327 } else {
328 pr_err("Warning: One autorebuild process already running.\n");
329 }
330 }
331 fclose(comm_fp);
332 }
333 fclose(fp);
334 }
335 if (scan) {
336 if (mkdir(MDMON_DIR, S_IRWXU) < 0 && errno != EEXIST) {
337 pr_err("Can't create autorebuild.pid file\n");
338 } else {
339 fp = fopen(path, "w");
340 if (!fp)
341 pr_err("Cannot create autorebuild.pidfile\n");
342 else {
343 pid = getpid();
344 fprintf(fp, "%d\n", pid);
345 fclose(fp);
346 }
347 }
348 }
349 return 0;
350 }
351
352 static void alert(char *event, char *dev, char *disc, struct alert_info *info)
353 {
354 int priority;
355
356 if (!info->alert_cmd && !info->mailaddr && !info->dosyslog) {
357 time_t now = time(0);
358
359 printf("%1.15s: %s on %s %s\n", ctime(&now) + 4,
360 event, dev, disc?disc:"unknown device");
361 }
362 if (info->alert_cmd) {
363 int pid = fork();
364 switch(pid) {
365 default:
366 waitpid(pid, NULL, 0);
367 break;
368 case -1:
369 break;
370 case 0:
371 execl(info->alert_cmd, info->alert_cmd,
372 event, dev, disc, NULL);
373 exit(2);
374 }
375 }
376 if (info->mailaddr && (strncmp(event, "Fail", 4) == 0 ||
377 strncmp(event, "Test", 4) == 0 ||
378 strncmp(event, "Spares", 6) == 0 ||
379 strncmp(event, "Degrade", 7) == 0)) {
380 FILE *mp = popen(Sendmail, "w");
381 if (mp) {
382 FILE *mdstat;
383 char hname[256];
384 gethostname(hname, sizeof(hname));
385 signal(SIGPIPE, SIG_IGN);
386 if (info->mailfrom)
387 fprintf(mp, "From: %s\n", info->mailfrom);
388 else
389 fprintf(mp, "From: %s monitoring <root>\n",
390 Name);
391 fprintf(mp, "To: %s\n", info->mailaddr);
392 fprintf(mp, "Subject: %s event on %s:%s\n\n",
393 event, dev, hname);
394
395 fprintf(mp,
396 "This is an automatically generated mail message from %s\n", Name);
397 fprintf(mp, "running on %s\n\n", hname);
398
399 fprintf(mp,
400 "A %s event had been detected on md device %s.\n\n", event, dev);
401
402 if (disc && disc[0] != ' ')
403 fprintf(mp,
404 "It could be related to component device %s.\n\n", disc);
405 if (disc && disc[0] == ' ')
406 fprintf(mp, "Extra information:%s.\n\n", disc);
407
408 fprintf(mp, "Faithfully yours, etc.\n");
409
410 mdstat = fopen("/proc/mdstat", "r");
411 if (mdstat) {
412 char buf[8192];
413 int n;
414 fprintf(mp,
415 "\nP.S. The /proc/mdstat file currently contains the following:\n\n");
416 while ((n = fread(buf, 1, sizeof(buf),
417 mdstat)) > 0)
418 n = fwrite(buf, 1, n, mp);
419 fclose(mdstat);
420 }
421 pclose(mp);
422 }
423 }
424
425 /* log the event to syslog maybe */
426 if (info->dosyslog) {
427 /* Log at a different severity depending on the event.
428 *
429 * These are the critical events: */
430 if (strncmp(event, "Fail", 4) == 0 ||
431 strncmp(event, "Degrade", 7) == 0 ||
432 strncmp(event, "DeviceDisappeared", 17) == 0)
433 priority = LOG_CRIT;
434 /* Good to know about, but are not failures: */
435 else if (strncmp(event, "Rebuild", 7) == 0 ||
436 strncmp(event, "MoveSpare", 9) == 0 ||
437 strncmp(event, "Spares", 6) != 0)
438 priority = LOG_WARNING;
439 /* Everything else: */
440 else
441 priority = LOG_INFO;
442
443 if (disc && disc[0] != ' ')
444 syslog(priority,
445 "%s event detected on md device %s, component device %s", event, dev, disc);
446 else if (disc)
447 syslog(priority,
448 "%s event detected on md device %s: %s",
449 event, dev, disc);
450 else
451 syslog(priority,
452 "%s event detected on md device %s",
453 event, dev);
454 }
455 }
456
457 static int check_array(struct state *st, struct mdstat_ent *mdstat,
458 int test, struct alert_info *ainfo,
459 int increments, char *prefer)
460 {
461 /* Update the state 'st' to reflect any changes shown in mdstat,
462 * or found by directly examining the array, and return
463 * '1' if the array is degraded, or '0' if it is optimal (or dead).
464 */
465 struct { int state, major, minor; } info[MAX_DISKS];
466 struct mdinfo *sra = NULL;
467 mdu_array_info_t array;
468 struct mdstat_ent *mse = NULL, *mse2;
469 char *dev = st->devname;
470 int fd;
471 int i;
472 int remaining_disks;
473 int last_disk;
474 int new_array = 0;
475 int retval;
476 int is_container = 0;
477 unsigned long redundancy_only_flags = 0;
478
479 if (test)
480 alert("TestMessage", dev, NULL, ainfo);
481
482 retval = 0;
483
484 fd = open(dev, O_RDONLY);
485 if (fd < 0)
486 goto disappeared;
487
488 if (st->devnm[0] == 0)
489 strcpy(st->devnm, fd2devnm(fd));
490
491 for (mse2 = mdstat; mse2; mse2 = mse2->next)
492 if (strcmp(mse2->devnm, st->devnm) == 0) {
493 mse2->devnm[0] = 0; /* flag it as "used" */
494 mse = mse2;
495 }
496
497 if (!mse) {
498 /* duplicated array in statelist
499 * or re-created after reading mdstat
500 */
501 st->err++;
502 goto out;
503 }
504
505 if (mse->level == NULL)
506 is_container = 1;
507
508 if (!is_container && !md_array_active(fd))
509 goto disappeared;
510
511 fcntl(fd, F_SETFD, FD_CLOEXEC);
512 if (md_get_array_info(fd, &array) < 0)
513 goto disappeared;
514
515 if (!is_container && map_name(pers, mse->level) > 0)
516 redundancy_only_flags |= GET_MISMATCH;
517
518 sra = sysfs_read(-1, st->devnm, GET_LEVEL | GET_DISKS | GET_DEVS |
519 GET_STATE | redundancy_only_flags);
520
521 if (!sra)
522 goto disappeared;
523
524 /* It's much easier to list what array levels can't
525 * have a device disappear than all of them that can
526 */
527 if (sra->array.level == 0 || sra->array.level == -1) {
528 if (!st->err && !st->from_config)
529 alert("DeviceDisappeared", dev, " Wrong-Level", ainfo);
530 st->err++;
531 goto out;
532 }
533
534 /* this array is in /proc/mdstat */
535 if (array.utime == 0)
536 /* external arrays don't update utime, so
537 * just make sure it is always different. */
538 array.utime = st->utime + 1;;
539
540 if (st->err) {
541 /* New array appeared where previously had an error */
542 st->err = 0;
543 st->percent = RESYNC_NONE;
544 new_array = 1;
545 alert("NewArray", st->devname, NULL, ainfo);
546 }
547
548 if (st->utime == array.utime && st->failed == sra->array.failed_disks &&
549 st->working == sra->array.working_disks &&
550 st->spare == sra->array.spare_disks &&
551 (mse == NULL || (mse->percent == st->percent))) {
552 if ((st->active < st->raid) && st->spare == 0)
553 retval = 1;
554 goto out;
555 }
556 if (st->utime == 0 && /* new array */
557 mse->pattern && strchr(mse->pattern, '_') /* degraded */)
558 alert("DegradedArray", dev, NULL, ainfo);
559
560 if (st->utime == 0 && /* new array */ st->expected_spares > 0 &&
561 sra->array.spare_disks < st->expected_spares)
562 alert("SparesMissing", dev, NULL, ainfo);
563 if (st->percent < 0 && st->percent != RESYNC_UNKNOWN &&
564 mse->percent >= 0)
565 alert("RebuildStarted", dev, NULL, ainfo);
566 if (st->percent >= 0 && mse->percent >= 0 &&
567 (mse->percent / increments) > (st->percent / increments)) {
568 char percentalert[18];
569 /*
570 * "RebuildNN" (10 chars) or "RebuildStarted" (15 chars)
571 */
572
573 if((mse->percent / increments) == 0)
574 snprintf(percentalert, sizeof(percentalert),
575 "RebuildStarted");
576 else
577 snprintf(percentalert, sizeof(percentalert),
578 "Rebuild%02d", mse->percent);
579
580 alert(percentalert, dev, NULL, ainfo);
581 }
582
583 if (mse->percent == RESYNC_NONE && st->percent >= 0) {
584 /* Rebuild/sync/whatever just finished.
585 * If there is a number in /mismatch_cnt,
586 * we should report that.
587 */
588 if (sra && sra->mismatch_cnt > 0) {
589 char cnt[80];
590 snprintf(cnt, sizeof(cnt),
591 " mismatches found: %d (on raid level %d)",
592 sra->mismatch_cnt, sra->array.level);
593 alert("RebuildFinished", dev, cnt, ainfo);
594 } else
595 alert("RebuildFinished", dev, NULL, ainfo);
596 }
597 st->percent = mse->percent;
598
599 remaining_disks = sra->array.nr_disks;
600 for (i = 0; i < MAX_DISKS && remaining_disks > 0; i++) {
601 mdu_disk_info_t disc;
602 disc.number = i;
603 if (md_get_disk_info(fd, &disc) >= 0) {
604 info[i].state = disc.state;
605 info[i].major = disc.major;
606 info[i].minor = disc.minor;
607 if (disc.major || disc.minor)
608 remaining_disks --;
609 } else
610 info[i].major = info[i].minor = 0;
611 }
612 last_disk = i;
613
614 if (mse->metadata_version &&
615 strncmp(mse->metadata_version, "external:", 9) == 0 &&
616 is_subarray(mse->metadata_version+9)) {
617 char *sl;
618 strcpy(st->parent_devnm, mse->metadata_version + 10);
619 sl = strchr(st->parent_devnm, '/');
620 if (sl)
621 *sl = 0;
622 } else
623 st->parent_devnm[0] = 0;
624 if (st->metadata == NULL && st->parent_devnm[0] == 0)
625 st->metadata = super_by_fd(fd, NULL);
626
627 for (i = 0; i < MAX_DISKS; i++) {
628 mdu_disk_info_t disc = {0, 0, 0, 0, 0};
629 int newstate = 0;
630 int change;
631 char *dv = NULL;
632 disc.number = i;
633 if (i < last_disk && (info[i].major || info[i].minor)) {
634 newstate = info[i].state;
635 dv = map_dev_preferred(info[i].major, info[i].minor, 1,
636 prefer);
637 disc.state = newstate;
638 disc.major = info[i].major;
639 disc.minor = info[i].minor;
640 } else
641 newstate = (1 << MD_DISK_REMOVED);
642
643 if (dv == NULL && st->devid[i])
644 dv = map_dev_preferred(major(st->devid[i]),
645 minor(st->devid[i]), 1, prefer);
646 change = newstate ^ st->devstate[i];
647 if (st->utime && change && !st->err && !new_array) {
648 if ((st->devstate[i]&change) & (1 << MD_DISK_SYNC))
649 alert("Fail", dev, dv, ainfo);
650 else if ((newstate & (1 << MD_DISK_FAULTY)) &&
651 (disc.major || disc.minor) &&
652 st->devid[i] == makedev(disc.major,
653 disc.minor))
654 alert("FailSpare", dev, dv, ainfo);
655 else if ((newstate&change) & (1 << MD_DISK_SYNC))
656 alert("SpareActive", dev, dv, ainfo);
657 }
658 st->devstate[i] = newstate;
659 st->devid[i] = makedev(disc.major, disc.minor);
660 }
661 st->active = sra->array.active_disks;
662 st->working = sra->array.working_disks;
663 st->spare = sra->array.spare_disks;
664 st->failed = sra->array.failed_disks;
665 st->utime = array.utime;
666 st->raid = sra->array.raid_disks;
667 st->err = 0;
668 if ((st->active < st->raid) && st->spare == 0)
669 retval = 1;
670
671 out:
672 if (sra)
673 sysfs_free(sra);
674 if (fd >= 0)
675 close(fd);
676 return retval;
677
678 disappeared:
679 if (!st->err)
680 alert("DeviceDisappeared", dev, NULL, ainfo);
681 st->err++;
682 goto out;
683 }
684
685 static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist,
686 int test, struct alert_info *info)
687 {
688 struct mdstat_ent *mse;
689 int new_found = 0;
690 char *name;
691
692 for (mse = mdstat; mse; mse = mse->next)
693 if (mse->devnm[0] && (!mse->level || /* retrieve containers */
694 (strcmp(mse->level, "raid0") != 0 &&
695 strcmp(mse->level, "linear") != 0))) {
696 struct state *st = xcalloc(1, sizeof *st);
697 mdu_array_info_t array;
698 int fd;
699
700 name = get_md_name(mse->devnm);
701 if (!name) {
702 free(st);
703 continue;
704 }
705
706 st->devname = xstrdup(name);
707 if ((fd = open(st->devname, O_RDONLY)) < 0 ||
708 md_get_array_info(fd, &array) < 0) {
709 /* no such array */
710 if (fd >= 0)
711 close(fd);
712 put_md_name(st->devname);
713 free(st->devname);
714 if (st->metadata) {
715 st->metadata->ss->free_super(st->metadata);
716 free(st->metadata);
717 }
718 free(st);
719 continue;
720 }
721 close(fd);
722 st->next = *statelist;
723 st->err = 1;
724 st->from_auto = 1;
725 strcpy(st->devnm, mse->devnm);
726 st->percent = RESYNC_UNKNOWN;
727 st->expected_spares = -1;
728 if (mse->metadata_version &&
729 strncmp(mse->metadata_version,
730 "external:", 9) == 0 &&
731 is_subarray(mse->metadata_version+9)) {
732 char *sl;
733 strcpy(st->parent_devnm,
734 mse->metadata_version+10);
735 sl = strchr(st->parent_devnm, '/');
736 *sl = 0;
737 } else
738 st->parent_devnm[0] = 0;
739 *statelist = st;
740 if (test)
741 alert("TestMessage", st->devname, NULL, info);
742 new_found = 1;
743 }
744 return new_found;
745 }
746
747 static int get_required_spare_criteria(struct state *st,
748 struct spare_criteria *sc)
749 {
750 int fd;
751
752 if (!st->metadata || !st->metadata->ss->get_spare_criteria) {
753 sc->min_size = 0;
754 sc->sector_size = 0;
755 return 0;
756 }
757
758 fd = open(st->devname, O_RDONLY);
759 if (fd < 0)
760 return 1;
761 if (st->metadata->ss->external)
762 st->metadata->ss->load_container(st->metadata, fd, st->devname);
763 else
764 st->metadata->ss->load_super(st->metadata, fd, st->devname);
765 close(fd);
766 if (!st->metadata->sb)
767 return 1;
768
769 st->metadata->ss->get_spare_criteria(st->metadata, sc);
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, struct spare_criteria *sc)
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 && from->devstate[d] == 0) {
808 struct dev_policy *pol;
809 unsigned long long dev_size;
810 unsigned int dev_sector_size;
811
812 if (to->metadata->ss->external &&
813 test_partition_from_id(from->devid[d]))
814 continue;
815
816 if (sc->min_size &&
817 dev_size_from_id(from->devid[d], &dev_size) &&
818 dev_size < sc->min_size)
819 continue;
820
821 if (sc->sector_size &&
822 dev_sector_size_from_id(from->devid[d],
823 &dev_sector_size) &&
824 sc->sector_size != dev_sector_size)
825 continue;
826
827 pol = devid_policy(from->devid[d]);
828 if (from->spare_group)
829 pol_add(&pol, pol_domain,
830 from->spare_group, NULL);
831 if (domain_test(domlist, pol,
832 to->metadata->ss->name) == 1)
833 dev = from->devid[d];
834 dev_policy_free(pol);
835 }
836 }
837 return dev;
838 }
839
840 static dev_t container_choose_spare(struct state *from, struct state *to,
841 struct domainlist *domlist,
842 struct spare_criteria *sc, int active)
843 {
844 /* This is similar to choose_spare, but we cannot trust devstate,
845 * so we need to read the metadata instead
846 */
847 struct mdinfo *list;
848 struct supertype *st = from->metadata;
849 int fd = open(from->devname, O_RDONLY);
850 int err;
851 dev_t dev = 0;
852
853 if (fd < 0)
854 return 0;
855 if (!st->ss->getinfo_super_disks) {
856 close(fd);
857 return 0;
858 }
859
860 err = st->ss->load_container(st, fd, NULL);
861 close(fd);
862 if (err)
863 return 0;
864
865 if (from == to) {
866 /* We must check if number of active disks has not increased
867 * since ioctl in main loop. mdmon may have added spare
868 * to subarray. If so we do not need to look for more spares
869 * so return non zero value */
870 int active_cnt = 0;
871 struct mdinfo *dp;
872 list = st->ss->getinfo_super_disks(st);
873 if (!list) {
874 st->ss->free_super(st);
875 return 1;
876 }
877 dp = list->devs;
878 while (dp) {
879 if (dp->disk.state & (1 << MD_DISK_SYNC) &&
880 !(dp->disk.state & (1 << MD_DISK_FAULTY)))
881 active_cnt++;
882 dp = dp->next;
883 }
884 sysfs_free(list);
885 if (active < active_cnt) {
886 /* Spare just activated.*/
887 st->ss->free_super(st);
888 return 1;
889 }
890 }
891
892 /* We only need one spare so full list not needed */
893 list = container_choose_spares(st, sc, domlist, from->spare_group,
894 to->metadata->ss->name, 1);
895 if (list) {
896 struct mdinfo *disks = list->devs;
897 if (disks)
898 dev = makedev(disks->disk.major, disks->disk.minor);
899 sysfs_free(list);
900 }
901 st->ss->free_super(st);
902 return dev;
903 }
904
905 static void try_spare_migration(struct state *statelist, struct alert_info *info)
906 {
907 struct state *from;
908 struct state *st;
909 struct spare_criteria sc;
910
911 link_containers_with_subarrays(statelist);
912 for (st = statelist; st; st = st->next)
913 if (st->active < st->raid && st->spare == 0 && !st->err) {
914 struct domainlist *domlist = NULL;
915 int d;
916 struct state *to = st;
917
918 if (to->parent_devnm[0] && !to->parent)
919 /* subarray monitored without parent container
920 * we can't move spares here */
921 continue;
922
923 if (to->parent)
924 /* member of a container */
925 to = to->parent;
926
927 if (get_required_spare_criteria(to, &sc))
928 continue;
929 if (to->metadata->ss->external) {
930 /* We must make sure there is
931 * no suitable spare in container already.
932 * If there is we don't add more */
933 dev_t devid = container_choose_spare(
934 to, to, NULL, &sc, st->active);
935 if (devid > 0)
936 continue;
937 }
938 for (d = 0; d < MAX_DISKS; d++)
939 if (to->devid[d])
940 domainlist_add_dev(&domlist,
941 to->devid[d],
942 to->metadata->ss->name);
943 if (to->spare_group)
944 domain_add(&domlist, to->spare_group);
945 /*
946 * No spare migration if the destination
947 * has no domain. Skip this array.
948 */
949 if (!domlist)
950 continue;
951 for (from=statelist ; from ; from=from->next) {
952 dev_t devid;
953 if (!check_donor(from, to))
954 continue;
955 if (from->metadata->ss->external)
956 devid = container_choose_spare(
957 from, to, domlist, &sc, 0);
958 else
959 devid = choose_spare(from, to, domlist,
960 &sc);
961 if (devid > 0 &&
962 move_spare(from->devname, to->devname,
963 devid)) {
964 alert("MoveSpare", to->devname,
965 from->devname, info);
966 break;
967 }
968 }
969 domain_free(domlist);
970 }
971 }
972
973 /* search the statelist to connect external
974 * metadata subarrays with their containers
975 * We always completely rebuild the tree from scratch as
976 * that is safest considering the possibility of entries
977 * disappearing or changing.
978 */
979 static void link_containers_with_subarrays(struct state *list)
980 {
981 struct state *st;
982 struct state *cont;
983 for (st = list; st; st = st->next) {
984 st->parent = NULL;
985 st->subarray = NULL;
986 }
987 for (st = list; st; st = st->next)
988 if (st->parent_devnm[0])
989 for (cont = list; cont; cont = cont->next)
990 if (!cont->err && cont->parent_devnm[0] == 0 &&
991 strcmp(cont->devnm, st->parent_devnm) == 0) {
992 st->parent = cont;
993 st->subarray = cont->subarray;
994 cont->subarray = st;
995 break;
996 }
997 }
998
999 /* Not really Monitor but ... */
1000 int Wait(char *dev)
1001 {
1002 char devnm[32];
1003 dev_t rdev;
1004 char *tmp;
1005 int rv = 1;
1006 int frozen_remaining = 3;
1007
1008 if (!stat_is_blkdev(dev, &rdev))
1009 return 2;
1010
1011 tmp = devid2devnm(rdev);
1012 if (!tmp) {
1013 pr_err("Cannot get md device name.\n");
1014 return 2;
1015 }
1016
1017 strcpy(devnm, tmp);
1018
1019 while(1) {
1020 struct mdstat_ent *ms = mdstat_read(1, 0);
1021 struct mdstat_ent *e;
1022
1023 for (e = ms; e; e = e->next)
1024 if (strcmp(e->devnm, devnm) == 0)
1025 break;
1026
1027 if (e && e->percent == RESYNC_NONE) {
1028 /* We could be in the brief pause before something
1029 * starts. /proc/mdstat doesn't show that, but
1030 * sync_action does.
1031 */
1032 struct mdinfo mdi;
1033 char buf[21];
1034
1035 if (sysfs_init(&mdi, -1, devnm))
1036 return 2;
1037 if (sysfs_get_str(&mdi, NULL, "sync_action",
1038 buf, 20) > 0 &&
1039 strcmp(buf,"idle\n") != 0) {
1040 e->percent = RESYNC_UNKNOWN;
1041 if (strcmp(buf, "frozen\n") == 0) {
1042 if (frozen_remaining == 0)
1043 e->percent = RESYNC_NONE;
1044 else
1045 frozen_remaining -= 1;
1046 }
1047 }
1048 }
1049 if (!e || e->percent == RESYNC_NONE) {
1050 if (e && e->metadata_version &&
1051 strncmp(e->metadata_version, "external:", 9) == 0) {
1052 if (is_subarray(&e->metadata_version[9]))
1053 ping_monitor(&e->metadata_version[9]);
1054 else
1055 ping_monitor(devnm);
1056 }
1057 free_mdstat(ms);
1058 return rv;
1059 }
1060 free_mdstat(ms);
1061 rv = 0;
1062 mdstat_wait(5);
1063 }
1064 }
1065
1066 /* The state "broken" is used only for RAID0/LINEAR - it's the same as
1067 * "clean", but used in case the array has one or more members missing.
1068 */
1069 static char *clean_states[] = {
1070 "clear", "inactive", "readonly", "read-auto", "clean", "broken", NULL };
1071
1072 int WaitClean(char *dev, int verbose)
1073 {
1074 int fd;
1075 struct mdinfo *mdi;
1076 int rv = 1;
1077 char devnm[32];
1078
1079 if (!stat_is_blkdev(dev, NULL))
1080 return 2;
1081 fd = open(dev, O_RDONLY);
1082 if (fd < 0) {
1083 if (verbose)
1084 pr_err("Couldn't open %s: %s\n", dev, strerror(errno));
1085 return 1;
1086 }
1087
1088 strcpy(devnm, fd2devnm(fd));
1089 mdi = sysfs_read(fd, devnm, GET_VERSION|GET_LEVEL|GET_SAFEMODE);
1090 if (!mdi) {
1091 if (verbose)
1092 pr_err("Failed to read sysfs attributes for %s\n", dev);
1093 close(fd);
1094 return 0;
1095 }
1096
1097 switch(mdi->array.level) {
1098 case LEVEL_LINEAR:
1099 case LEVEL_MULTIPATH:
1100 case 0:
1101 /* safemode delay is irrelevant for these levels */
1102 rv = 0;
1103 }
1104
1105 /* for internal metadata the kernel handles the final clean
1106 * transition, containers can never be dirty
1107 */
1108 if (!is_subarray(mdi->text_version))
1109 rv = 0;
1110
1111 /* safemode disabled ? */
1112 if (mdi->safe_mode_delay == 0)
1113 rv = 0;
1114
1115 if (rv) {
1116 int state_fd = sysfs_open(fd2devnm(fd), NULL, "array_state");
1117 char buf[20];
1118 int delay = 5000;
1119
1120 /* minimize the safe_mode_delay and prepare to wait up to 5s
1121 * for writes to quiesce
1122 */
1123 sysfs_set_safemode(mdi, 1);
1124
1125 /* wait for array_state to be clean */
1126 while (1) {
1127 rv = read(state_fd, buf, sizeof(buf));
1128 if (rv < 0)
1129 break;
1130 if (sysfs_match_word(buf, clean_states) <
1131 (int)ARRAY_SIZE(clean_states) - 1)
1132 break;
1133 rv = sysfs_wait(state_fd, &delay);
1134 if (rv < 0 && errno != EINTR)
1135 break;
1136 lseek(state_fd, 0, SEEK_SET);
1137 }
1138 if (rv < 0)
1139 rv = 1;
1140 else if (ping_monitor(mdi->text_version) == 0) {
1141 /* we need to ping to close the window between array
1142 * state transitioning to clean and the metadata being
1143 * marked clean
1144 */
1145 rv = 0;
1146 } else {
1147 rv = 1;
1148 pr_err("Error connecting monitor with %s\n", dev);
1149 }
1150 if (rv && verbose)
1151 pr_err("Error waiting for %s to be clean\n", dev);
1152
1153 /* restore the original safe_mode_delay */
1154 sysfs_set_safemode(mdi, mdi->safe_mode_delay);
1155 close(state_fd);
1156 }
1157
1158 sysfs_free(mdi);
1159 close(fd);
1160
1161 return rv;
1162 }
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