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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) { | |
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 | if (make_daemon(pidfile)) | |
157 | return 1; | |
158 | ||
159 | if (share) | |
160 | if (check_one_sharer(scan)) | |
161 | return 1; | |
162 | ||
163 | if (devlist == NULL) { | |
164 | struct mddev_ident *mdlist = conf_get_ident(NULL); | |
165 | for (; mdlist; mdlist=mdlist->next) { | |
166 | struct state *st; | |
167 | if (mdlist->devname == NULL) | |
168 | continue; | |
169 | if (strcasecmp(mdlist->devname, "<ignore>") == 0) | |
170 | continue; | |
171 | st = calloc(1, sizeof *st); | |
172 | if (st == NULL) | |
173 | continue; | |
174 | if (mdlist->devname[0] == '/') | |
175 | st->devname = strdup(mdlist->devname); | |
176 | else { | |
177 | st->devname = malloc(8+strlen(mdlist->devname)+1); | |
178 | strcpy(strcpy(st->devname, "/dev/md/"), | |
179 | mdlist->devname); | |
180 | } | |
181 | st->next = statelist; | |
182 | st->devnum = INT_MAX; | |
183 | st->percent = -2; | |
184 | st->expected_spares = mdlist->spare_disks; | |
185 | if (mdlist->spare_group) | |
186 | st->spare_group = strdup(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 = calloc(1, sizeof *st); | |
194 | if (st == NULL) | |
195 | continue; | |
196 | st->devname = strdup(dv->devname); | |
197 | st->next = statelist; | |
198 | st->devnum = INT_MAX; | |
199 | st->percent = -2; | |
200 | st->expected_spares = -1; | |
201 | if (mdlist) { | |
202 | st->expected_spares = mdlist->spare_disks; | |
203 | if (mdlist->spare_group) | |
204 | st->spare_group = strdup(mdlist->spare_group); | |
205 | } | |
206 | statelist = st; | |
207 | } | |
208 | } | |
209 | ||
210 | ||
211 | while (! finished) { | |
212 | int new_found = 0; | |
213 | struct state *st; | |
214 | int anydegraded = 0; | |
215 | ||
216 | if (mdstat) | |
217 | free_mdstat(mdstat); | |
218 | mdstat = mdstat_read(oneshot?0:1, 0); | |
219 | ||
220 | for (st=statelist; st; st=st->next) | |
221 | if (check_array(st, mdstat, test, &info, increments)) | |
222 | anydegraded = 1; | |
223 | ||
224 | /* now check if there are any new devices found in mdstat */ | |
225 | if (scan) | |
226 | new_found = add_new_arrays(mdstat, &statelist, 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(period); | |
240 | } | |
241 | test = 0; | |
242 | } | |
243 | if (pidfile) | |
244 | unlink(pidfile); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int make_daemon(char *pidfile) | |
249 | { | |
250 | int pid = fork(); | |
251 | if (pid > 0) { | |
252 | if (!pidfile) | |
253 | printf("%d\n", pid); | |
254 | else { | |
255 | FILE *pid_file; | |
256 | pid_file=fopen(pidfile, "w"); | |
257 | if (!pid_file) | |
258 | perror("cannot create pid file"); | |
259 | else { | |
260 | fprintf(pid_file,"%d\n", pid); | |
261 | fclose(pid_file); | |
262 | } | |
263 | } | |
264 | return 0; | |
265 | } | |
266 | if (pid < 0) { | |
267 | perror("daemonise"); | |
268 | return 1; | |
269 | } | |
270 | close(0); | |
271 | open("/dev/null", O_RDWR); | |
272 | dup2(0,1); | |
273 | dup2(0,2); | |
274 | setsid(); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int check_one_sharer(int scan) | |
279 | { | |
280 | int pid, rv; | |
281 | FILE *fp; | |
282 | char dir[20]; | |
283 | struct stat buf; | |
284 | fp = fopen("/var/run/mdadm/autorebuild.pid", "r"); | |
285 | if (fp) { | |
286 | fscanf(fp, "%d", &pid); | |
287 | sprintf(dir, "/proc/%d", pid); | |
288 | rv = stat(dir, &buf); | |
289 | if (rv != -1) { | |
290 | if (scan) { | |
291 | fprintf(stderr, Name ": Only one " | |
292 | "autorebuild process allowed" | |
293 | " in scan mode, aborting\n"); | |
294 | fclose(fp); | |
295 | return 1; | |
296 | } else { | |
297 | fprintf(stderr, Name ": Warning: One" | |
298 | " autorebuild process already" | |
299 | " running.\n"); | |
300 | } | |
301 | } | |
302 | fclose(fp); | |
303 | } | |
304 | if (scan) { | |
305 | if (mkdir("/var/run/mdadm", S_IRWXU) < 0 && | |
306 | errno != EEXIST) { | |
307 | fprintf(stderr, Name ": Can't create " | |
308 | "autorebuild.pid file\n"); | |
309 | } else { | |
310 | fp = fopen("/var/run/mdadm/autorebuild.pid", "w"); | |
311 | if (!fp) | |
312 | fprintf(stderr, Name ": Cannot create" | |
313 | " autorebuild.pid" | |
314 | "file\n"); | |
315 | else { | |
316 | pid = getpid(); | |
317 | fprintf(fp, "%d\n", pid); | |
318 | fclose(fp); | |
319 | } | |
320 | } | |
321 | } | |
322 | return 0; | |
323 | } | |
324 | ||
325 | static void alert(char *event, char *dev, char *disc, struct alert_info *info) | |
326 | { | |
327 | int priority; | |
328 | ||
329 | if (!info->alert_cmd && !info->mailaddr) { | |
330 | time_t now = time(0); | |
331 | ||
332 | printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device"); | |
333 | } | |
334 | if (info->alert_cmd) { | |
335 | int pid = fork(); | |
336 | switch(pid) { | |
337 | default: | |
338 | waitpid(pid, NULL, 0); | |
339 | break; | |
340 | case -1: | |
341 | break; | |
342 | case 0: | |
343 | execl(info->alert_cmd, info->alert_cmd, | |
344 | event, dev, disc, NULL); | |
345 | exit(2); | |
346 | } | |
347 | } | |
348 | if (info->mailaddr && | |
349 | (strncmp(event, "Fail", 4)==0 || | |
350 | strncmp(event, "Test", 4)==0 || | |
351 | strncmp(event, "Spares", 6)==0 || | |
352 | strncmp(event, "Degrade", 7)==0)) { | |
353 | FILE *mp = popen(Sendmail, "w"); | |
354 | if (mp) { | |
355 | FILE *mdstat; | |
356 | char hname[256]; | |
357 | gethostname(hname, sizeof(hname)); | |
358 | signal(SIGPIPE, SIG_IGN); | |
359 | if (info->mailfrom) | |
360 | fprintf(mp, "From: %s\n", info->mailfrom); | |
361 | else | |
362 | fprintf(mp, "From: " Name " monitoring <root>\n"); | |
363 | fprintf(mp, "To: %s\n", info->mailaddr); | |
364 | fprintf(mp, "Subject: %s event on %s:%s\n\n", | |
365 | event, dev, hname); | |
366 | ||
367 | fprintf(mp, | |
368 | "This is an automatically generated" | |
369 | " mail message from " Name "\n"); | |
370 | fprintf(mp, "running on %s\n\n", hname); | |
371 | ||
372 | fprintf(mp, | |
373 | "A %s event had been detected on" | |
374 | " md device %s.\n\n", event, dev); | |
375 | ||
376 | if (disc && disc[0] != ' ') | |
377 | fprintf(mp, | |
378 | "It could be related to" | |
379 | " component device %s.\n\n", disc); | |
380 | if (disc && disc[0] == ' ') | |
381 | fprintf(mp, "Extra information:%s.\n\n", disc); | |
382 | ||
383 | fprintf(mp, "Faithfully yours, etc.\n"); | |
384 | ||
385 | mdstat = fopen("/proc/mdstat", "r"); | |
386 | if (mdstat) { | |
387 | char buf[8192]; | |
388 | int n; | |
389 | fprintf(mp, | |
390 | "\nP.S. The /proc/mdstat file" | |
391 | " currently contains the following:\n\n"); | |
392 | while ( (n=fread(buf, 1, sizeof(buf), mdstat)) > 0) | |
393 | n=fwrite(buf, 1, n, mp); | |
394 | fclose(mdstat); | |
395 | } | |
396 | pclose(mp); | |
397 | } | |
398 | } | |
399 | ||
400 | /* log the event to syslog maybe */ | |
401 | if (info->dosyslog) { | |
402 | /* Log at a different severity depending on the event. | |
403 | * | |
404 | * These are the critical events: */ | |
405 | if (strncmp(event, "Fail", 4)==0 || | |
406 | strncmp(event, "Degrade", 7)==0 || | |
407 | strncmp(event, "DeviceDisappeared", 17)==0) | |
408 | priority = LOG_CRIT; | |
409 | /* Good to know about, but are not failures: */ | |
410 | else if (strncmp(event, "Rebuild", 7)==0 || | |
411 | strncmp(event, "MoveSpare", 9)==0 || | |
412 | strncmp(event, "Spares", 6) != 0) | |
413 | priority = LOG_WARNING; | |
414 | /* Everything else: */ | |
415 | else | |
416 | priority = LOG_INFO; | |
417 | ||
418 | if (disc) | |
419 | syslog(priority, | |
420 | "%s event detected on md device %s," | |
421 | " component device %s", event, dev, disc); | |
422 | else | |
423 | syslog(priority, | |
424 | "%s event detected on md device %s", | |
425 | event, dev); | |
426 | } | |
427 | } | |
428 | ||
429 | static int check_array(struct state *st, struct mdstat_ent *mdstat, | |
430 | int test, struct alert_info *ainfo, | |
431 | int increments) | |
432 | { | |
433 | /* Update the state 'st' to reflect any changes shown in mdstat, | |
434 | * or found by directly examining the array, and return | |
435 | * '1' if the array is degraded, or '0' if it is optimal (or dead). | |
436 | */ | |
437 | struct { int state, major, minor; } info[MaxDisks]; | |
438 | mdu_array_info_t array; | |
439 | struct mdstat_ent *mse = NULL, *mse2; | |
440 | char *dev = st->devname; | |
441 | int fd; | |
442 | int i; | |
443 | ||
444 | if (test) | |
445 | alert("TestMessage", dev, NULL, ainfo); | |
446 | fd = open(dev, O_RDONLY); | |
447 | if (fd < 0) { | |
448 | if (!st->err) | |
449 | alert("DeviceDisappeared", dev, NULL, ainfo); | |
450 | st->err=1; | |
451 | return 0; | |
452 | } | |
453 | fcntl(fd, F_SETFD, FD_CLOEXEC); | |
454 | if (ioctl(fd, GET_ARRAY_INFO, &array)<0) { | |
455 | if (!st->err) | |
456 | alert("DeviceDisappeared", dev, NULL, ainfo); | |
457 | st->err=1; | |
458 | close(fd); | |
459 | return 0; | |
460 | } | |
461 | /* It's much easier to list what array levels can't | |
462 | * have a device disappear than all of them that can | |
463 | */ | |
464 | if (array.level == 0 || array.level == -1) { | |
465 | if (!st->err) | |
466 | alert("DeviceDisappeared", dev, "Wrong-Level", ainfo); | |
467 | st->err = 1; | |
468 | close(fd); | |
469 | return 0; | |
470 | } | |
471 | if (st->devnum == INT_MAX) { | |
472 | struct stat stb; | |
473 | if (fstat(fd, &stb) == 0 && | |
474 | (S_IFMT&stb.st_mode)==S_IFBLK) { | |
475 | if (major(stb.st_rdev) == MD_MAJOR) | |
476 | st->devnum = minor(stb.st_rdev); | |
477 | else | |
478 | st->devnum = -1- (minor(stb.st_rdev)>>6); | |
479 | } | |
480 | } | |
481 | ||
482 | for (mse2 = mdstat ; mse2 ; mse2=mse2->next) | |
483 | if (mse2->devnum == st->devnum) { | |
484 | mse2->devnum = INT_MAX; /* flag it as "used" */ | |
485 | mse = mse2; | |
486 | } | |
487 | ||
488 | if (!mse) { | |
489 | /* duplicated array in statelist | |
490 | * or re-created after reading mdstat*/ | |
491 | st->err = 1; | |
492 | close(fd); | |
493 | return 0; | |
494 | } | |
495 | /* this array is in /proc/mdstat */ | |
496 | if (array.utime == 0) | |
497 | /* external arrays don't update utime, so | |
498 | * just make sure it is always different. */ | |
499 | array.utime = st->utime + 1;; | |
500 | ||
501 | if (st->utime == array.utime && | |
502 | st->failed == array.failed_disks && | |
503 | st->working == array.working_disks && | |
504 | st->spare == array.spare_disks && | |
505 | (mse == NULL || ( | |
506 | mse->percent == st->percent | |
507 | ))) { | |
508 | close(fd); | |
509 | st->err = 0; | |
510 | if ((st->active < st->raid) && st->spare == 0) | |
511 | return 1; | |
512 | else | |
513 | return 0; | |
514 | } | |
515 | if (st->utime == 0 && /* new array */ | |
516 | mse->pattern && strchr(mse->pattern, '_') /* degraded */ | |
517 | ) | |
518 | alert("DegradedArray", dev, NULL, ainfo); | |
519 | ||
520 | if (st->utime == 0 && /* new array */ | |
521 | st->expected_spares > 0 && | |
522 | array.spare_disks < st->expected_spares) | |
523 | alert("SparesMissing", dev, NULL, ainfo); | |
524 | if (st->percent == -1 && | |
525 | mse->percent >= 0) | |
526 | alert("RebuildStarted", dev, NULL, ainfo); | |
527 | if (st->percent >= 0 && | |
528 | mse->percent >= 0 && | |
529 | (mse->percent / increments) > (st->percent / increments)) { | |
530 | char percentalert[15]; // "RebuildNN" (10 chars) or "RebuildStarted" (15 chars) | |
531 | ||
532 | if((mse->percent / increments) == 0) | |
533 | snprintf(percentalert, sizeof(percentalert), "RebuildStarted"); | |
534 | else | |
535 | snprintf(percentalert, sizeof(percentalert), "Rebuild%02d", mse->percent); | |
536 | ||
537 | alert(percentalert, dev, NULL, ainfo); | |
538 | } | |
539 | ||
540 | if (mse->percent == -1 && | |
541 | st->percent >= 0) { | |
542 | /* Rebuild/sync/whatever just finished. | |
543 | * If there is a number in /mismatch_cnt, | |
544 | * we should report that. | |
545 | */ | |
546 | struct mdinfo *sra = | |
547 | sysfs_read(-1, st->devnum, GET_MISMATCH); | |
548 | if (sra && sra->mismatch_cnt > 0) { | |
549 | char cnt[40]; | |
550 | sprintf(cnt, " mismatches found: %d", sra->mismatch_cnt); | |
551 | alert("RebuildFinished", dev, cnt, ainfo); | |
552 | } else | |
553 | alert("RebuildFinished", dev, NULL, ainfo); | |
554 | if (sra) | |
555 | free(sra); | |
556 | } | |
557 | st->percent = mse->percent; | |
558 | ||
559 | for (i=0; i<MaxDisks && i <= array.raid_disks + array.nr_disks; | |
560 | i++) { | |
561 | mdu_disk_info_t disc; | |
562 | disc.number = i; | |
563 | if (ioctl(fd, GET_DISK_INFO, &disc) >= 0) { | |
564 | info[i].state = disc.state; | |
565 | info[i].major = disc.major; | |
566 | info[i].minor = disc.minor; | |
567 | } else | |
568 | info[i].major = info[i].minor = 0; | |
569 | } | |
570 | ||
571 | if (strncmp(mse->metadata_version, "external:", 9) == 0 && | |
572 | is_subarray(mse->metadata_version+9)) | |
573 | st->parent_dev = | |
574 | devname2devnum(mse->metadata_version+10); | |
575 | else | |
576 | st->parent_dev = NoMdDev; | |
577 | if (st->metadata == NULL && | |
578 | st->parent_dev == NoMdDev) | |
579 | st->metadata = super_by_fd(fd, NULL); | |
580 | ||
581 | close(fd); | |
582 | ||
583 | for (i=0; i<MaxDisks; i++) { | |
584 | mdu_disk_info_t disc = {0,0,0,0,0}; | |
585 | int newstate=0; | |
586 | int change; | |
587 | char *dv = NULL; | |
588 | disc.number = i; | |
589 | if (i > array.raid_disks + array.nr_disks) { | |
590 | newstate = 0; | |
591 | disc.major = disc.minor = 0; | |
592 | } else if (info[i].major || info[i].minor) { | |
593 | newstate = info[i].state; | |
594 | dv = map_dev(info[i].major, info[i].minor, 1); | |
595 | disc.state = newstate; | |
596 | disc.major = info[i].major; | |
597 | disc.minor = info[i].minor; | |
598 | } else if (mse && mse->pattern && i < (int)strlen(mse->pattern)) { | |
599 | switch(mse->pattern[i]) { | |
600 | case 'U': newstate = 6 /* ACTIVE/SYNC */; break; | |
601 | case '_': newstate = 0; break; | |
602 | } | |
603 | disc.major = disc.minor = 0; | |
604 | } | |
605 | if (dv == NULL && st->devid[i]) | |
606 | dv = map_dev(major(st->devid[i]), | |
607 | minor(st->devid[i]), 1); | |
608 | change = newstate ^ st->devstate[i]; | |
609 | if (st->utime && change && !st->err) { | |
610 | if (i < array.raid_disks && | |
611 | (((newstate&change)&(1<<MD_DISK_FAULTY)) || | |
612 | ((st->devstate[i]&change)&(1<<MD_DISK_ACTIVE)) || | |
613 | ((st->devstate[i]&change)&(1<<MD_DISK_SYNC))) | |
614 | ) | |
615 | alert("Fail", dev, dv, ainfo); | |
616 | else if (i >= array.raid_disks && | |
617 | (disc.major || disc.minor) && | |
618 | st->devid[i] == makedev(disc.major, disc.minor) && | |
619 | ((newstate&change)&(1<<MD_DISK_FAULTY)) | |
620 | ) | |
621 | alert("FailSpare", dev, dv, ainfo); | |
622 | else if (i < array.raid_disks && | |
623 | ! (newstate & (1<<MD_DISK_REMOVED)) && | |
624 | (((st->devstate[i]&change)&(1<<MD_DISK_FAULTY)) || | |
625 | ((newstate&change)&(1<<MD_DISK_ACTIVE)) || | |
626 | ((newstate&change)&(1<<MD_DISK_SYNC))) | |
627 | ) | |
628 | alert("SpareActive", dev, dv, ainfo); | |
629 | } | |
630 | st->devstate[i] = newstate; | |
631 | st->devid[i] = makedev(disc.major, disc.minor); | |
632 | } | |
633 | st->active = array.active_disks; | |
634 | st->working = array.working_disks; | |
635 | st->spare = array.spare_disks; | |
636 | st->failed = array.failed_disks; | |
637 | st->utime = array.utime; | |
638 | st->raid = array.raid_disks; | |
639 | st->err = 0; | |
640 | if ((st->active < st->raid) && st->spare == 0) | |
641 | return 1; | |
642 | return 0; | |
643 | } | |
644 | ||
645 | static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist, | |
646 | int test, struct alert_info *info) | |
647 | { | |
648 | struct mdstat_ent *mse; | |
649 | int new_found = 0; | |
650 | ||
651 | for (mse=mdstat; mse; mse=mse->next) | |
652 | if (mse->devnum != INT_MAX && | |
653 | (!mse->level || /* retrieve containers */ | |
654 | (strcmp(mse->level, "raid0") != 0 && | |
655 | strcmp(mse->level, "linear") != 0)) | |
656 | ) { | |
657 | struct state *st = calloc(1, sizeof *st); | |
658 | mdu_array_info_t array; | |
659 | int fd; | |
660 | if (st == NULL) | |
661 | continue; | |
662 | st->devname = strdup(get_md_name(mse->devnum)); | |
663 | if ((fd = open(st->devname, O_RDONLY)) < 0 || | |
664 | ioctl(fd, GET_ARRAY_INFO, &array)< 0) { | |
665 | /* no such array */ | |
666 | if (fd >=0) close(fd); | |
667 | put_md_name(st->devname); | |
668 | free(st->devname); | |
669 | if (st->metadata) { | |
670 | st->metadata->ss->free_super(st->metadata); | |
671 | free(st->metadata); | |
672 | } | |
673 | free(st); | |
674 | continue; | |
675 | } | |
676 | close(fd); | |
677 | st->next = *statelist; | |
678 | st->err = 1; | |
679 | st->devnum = mse->devnum; | |
680 | st->percent = -2; | |
681 | st->expected_spares = -1; | |
682 | if (strncmp(mse->metadata_version, "external:", 9) == 0 && | |
683 | is_subarray(mse->metadata_version+9)) | |
684 | st->parent_dev = | |
685 | devname2devnum(mse->metadata_version+10); | |
686 | else | |
687 | st->parent_dev = NoMdDev; | |
688 | *statelist = st; | |
689 | if (test) | |
690 | alert("TestMessage", st->devname, NULL, info); | |
691 | alert("NewArray", st->devname, NULL, info); | |
692 | new_found = 1; | |
693 | } | |
694 | return new_found; | |
695 | } | |
696 | ||
697 | unsigned long long min_spare_size_required(struct state *st) | |
698 | { | |
699 | int fd; | |
700 | unsigned long long rv = 0; | |
701 | ||
702 | if (!st->metadata || | |
703 | !st->metadata->ss->min_acceptable_spare_size) | |
704 | return rv; | |
705 | ||
706 | fd = open(st->devname, O_RDONLY); | |
707 | if (fd < 0) | |
708 | return 0; | |
709 | st->metadata->ss->load_super(st->metadata, fd, st->devname); | |
710 | close(fd); | |
711 | rv = st->metadata->ss->min_acceptable_spare_size(st->metadata); | |
712 | st->metadata->ss->free_super(st->metadata); | |
713 | ||
714 | return rv; | |
715 | } | |
716 | ||
717 | static int move_spare(struct state *from, struct state *to, | |
718 | dev_t devid, | |
719 | struct alert_info *info) | |
720 | { | |
721 | struct mddev_dev devlist; | |
722 | char devname[20]; | |
723 | ||
724 | /* try to remove and add */ | |
725 | int fd1 = open(to->devname, O_RDONLY); | |
726 | int fd2 = open(from->devname, O_RDONLY); | |
727 | ||
728 | if (fd1 < 0 || fd2 < 0) { | |
729 | if (fd1>=0) close(fd1); | |
730 | if (fd2>=0) close(fd2); | |
731 | return 0; | |
732 | } | |
733 | ||
734 | devlist.next = NULL; | |
735 | devlist.used = 0; | |
736 | devlist.re_add = 0; | |
737 | devlist.writemostly = 0; | |
738 | devlist.devname = devname; | |
739 | sprintf(devname, "%d:%d", major(devid), minor(devid)); | |
740 | ||
741 | devlist.disposition = 'r'; | |
742 | if (Manage_subdevs(from->devname, fd2, &devlist, -1, 0) == 0) { | |
743 | devlist.disposition = 'a'; | |
744 | if (Manage_subdevs(to->devname, fd1, &devlist, -1, 0) == 0) { | |
745 | alert("MoveSpare", to->devname, from->devname, info); | |
746 | close(fd1); | |
747 | close(fd2); | |
748 | return 1; | |
749 | } | |
750 | else Manage_subdevs(from->devname, fd2, &devlist, -1, 0); | |
751 | } | |
752 | close(fd1); | |
753 | close(fd2); | |
754 | return 0; | |
755 | } | |
756 | ||
757 | static int check_donor(struct state *from, struct state *to, | |
758 | struct domainlist *domlist) | |
759 | { | |
760 | struct state *sub; | |
761 | ||
762 | if (from == to) | |
763 | return 0; | |
764 | if (from->parent) | |
765 | /* Cannot move from a member */ | |
766 | return 0; | |
767 | if (from->err) | |
768 | return 0; | |
769 | for (sub = from->subarray; sub; sub = sub->subarray) | |
770 | /* If source array has degraded subarrays, don't | |
771 | * remove anything | |
772 | */ | |
773 | if (sub->active < sub->raid) | |
774 | return 0; | |
775 | if (from->metadata->ss->external == 0) | |
776 | if (from->active < from->raid) | |
777 | return 0; | |
778 | if (from->spare <= 0) | |
779 | return 0; | |
780 | if (domlist == NULL) | |
781 | return 0; | |
782 | return 1; | |
783 | } | |
784 | ||
785 | static dev_t choose_spare(struct state *from, struct state *to, | |
786 | struct domainlist *domlist, unsigned long long min_size) | |
787 | { | |
788 | int d; | |
789 | dev_t dev = 0; | |
790 | ||
791 | for (d = from->raid; !dev && d < MaxDisks; d++) { | |
792 | if (from->devid[d] > 0 && | |
793 | from->devstate[d] == 0) { | |
794 | struct dev_policy *pol; | |
795 | unsigned long long dev_size; | |
796 | ||
797 | if (min_size && | |
798 | dev_size_from_id(from->devid[d], &dev_size) && | |
799 | dev_size < min_size) | |
800 | continue; | |
801 | ||
802 | pol = devnum_policy(from->devid[d]); | |
803 | if (from->spare_group) | |
804 | pol_add(&pol, pol_domain, | |
805 | from->spare_group, NULL); | |
806 | if (domain_test(domlist, pol, to->metadata->ss->name)) | |
807 | dev = from->devid[d]; | |
808 | dev_policy_free(pol); | |
809 | } | |
810 | } | |
811 | return dev; | |
812 | } | |
813 | ||
814 | static dev_t container_choose_spare(struct state *from, struct state *to, | |
815 | struct domainlist *domlist, | |
816 | unsigned long long min_size) | |
817 | { | |
818 | /* This is similar to choose_spare, but we cannot trust devstate, | |
819 | * so we need to read the metadata instead | |
820 | */ | |
821 | ||
822 | struct supertype *st = from->metadata; | |
823 | int fd = open(from->devname, O_RDONLY); | |
824 | int err; | |
825 | struct mdinfo *disks, *d; | |
826 | dev_t dev = 0; | |
827 | ||
828 | if (fd < 0) | |
829 | return 0; | |
830 | if (!st->ss->getinfo_super_disks) | |
831 | return 0; | |
832 | ||
833 | err = st->ss->load_container(st, fd, NULL); | |
834 | close(fd); | |
835 | if (err) | |
836 | return 0; | |
837 | ||
838 | disks = st->ss->getinfo_super_disks(st); | |
839 | st->ss->free_super(st); | |
840 | ||
841 | if (!disks) | |
842 | return 0; | |
843 | ||
844 | for (d = disks->devs ; d && !dev ; d = d->next) { | |
845 | if (d->disk.state == 0) { | |
846 | struct dev_policy *pol; | |
847 | unsigned long long dev_size; | |
848 | dev = makedev(d->disk.major,d->disk.minor); | |
849 | ||
850 | if (min_size && | |
851 | dev_size_from_id(dev, &dev_size) && | |
852 | dev_size < min_size) { | |
853 | dev = 0; | |
854 | continue; | |
855 | } | |
856 | pol = devnum_policy(dev); | |
857 | if (from->spare_group) | |
858 | pol_add(&pol, pol_domain, | |
859 | from->spare_group, NULL); | |
860 | if (!domain_test(domlist, pol, to->metadata->ss->name)) | |
861 | dev = 0; | |
862 | ||
863 | dev_policy_free(pol); | |
864 | } | |
865 | } | |
866 | sysfs_free(disks); | |
867 | return dev; | |
868 | } | |
869 | ||
870 | ||
871 | static void try_spare_migration(struct state *statelist, struct alert_info *info) | |
872 | { | |
873 | struct state *from; | |
874 | struct state *st; | |
875 | ||
876 | link_containers_with_subarrays(statelist); | |
877 | for (st = statelist; st; st = st->next) | |
878 | if (st->active < st->raid && | |
879 | st->spare == 0 && !st->err) { | |
880 | struct domainlist *domlist = NULL; | |
881 | int d; | |
882 | struct state *to = st; | |
883 | unsigned long long min_size; | |
884 | ||
885 | if (to->parent) | |
886 | /* member of a container */ | |
887 | to = to->parent; | |
888 | ||
889 | min_size = min_spare_size_required(to); | |
890 | for (d = 0; d < MaxDisks; d++) | |
891 | if (to->devid[d]) | |
892 | domainlist_add_dev(&domlist, | |
893 | to->devid[d], | |
894 | to->metadata->ss->name); | |
895 | if (to->spare_group) | |
896 | domain_add(&domlist, to->spare_group); | |
897 | ||
898 | for (from=statelist ; from ; from=from->next) { | |
899 | dev_t devid; | |
900 | if (!check_donor(from, to, domlist)) | |
901 | continue; | |
902 | if (from->metadata->ss->external) | |
903 | devid = container_choose_spare( | |
904 | from, to, domlist, min_size); | |
905 | else | |
906 | devid = choose_spare(from, to, domlist, | |
907 | min_size); | |
908 | if (devid > 0 | |
909 | && move_spare(from, to, devid, info)) | |
910 | break; | |
911 | } | |
912 | domain_free(domlist); | |
913 | } | |
914 | } | |
915 | ||
916 | /* search the statelist to connect external | |
917 | * metadata subarrays with their containers | |
918 | * We always completely rebuild the tree from scratch as | |
919 | * that is safest considering the possibility of entries | |
920 | * disappearing or changing. | |
921 | */ | |
922 | static void link_containers_with_subarrays(struct state *list) | |
923 | { | |
924 | struct state *st; | |
925 | struct state *cont; | |
926 | for (st = list; st; st = st->next) { | |
927 | st->parent = NULL; | |
928 | st->subarray = NULL; | |
929 | } | |
930 | for (st = list; st; st = st->next) | |
931 | if (st->parent_dev != NoMdDev) | |
932 | for (cont = list; cont; cont = cont->next) | |
933 | if (!cont->err && | |
934 | cont->parent_dev == NoMdDev && | |
935 | cont->devnum == st->parent_dev) { | |
936 | st->parent = cont; | |
937 | st->subarray = cont->subarray; | |
938 | cont->subarray = st; | |
939 | break; | |
940 | } | |
941 | } | |
942 | ||
943 | /* Not really Monitor but ... */ | |
944 | int Wait(char *dev) | |
945 | { | |
946 | struct stat stb; | |
947 | int devnum; | |
948 | int rv = 1; | |
949 | ||
950 | if (stat(dev, &stb) != 0) { | |
951 | fprintf(stderr, Name ": Cannot find %s: %s\n", dev, | |
952 | strerror(errno)); | |
953 | return 2; | |
954 | } | |
955 | devnum = stat2devnum(&stb); | |
956 | ||
957 | while(1) { | |
958 | struct mdstat_ent *ms = mdstat_read(1, 0); | |
959 | struct mdstat_ent *e; | |
960 | ||
961 | for (e=ms ; e; e=e->next) | |
962 | if (e->devnum == devnum) | |
963 | break; | |
964 | ||
965 | if (!e || e->percent < 0) { | |
966 | if (e && e->metadata_version && | |
967 | strncmp(e->metadata_version, "external:", 9) == 0) { | |
968 | if (is_subarray(&e->metadata_version[9])) | |
969 | ping_monitor(&e->metadata_version[9]); | |
970 | else | |
971 | ping_monitor(devnum2devname(devnum)); | |
972 | } | |
973 | free_mdstat(ms); | |
974 | return rv; | |
975 | } | |
976 | free_mdstat(ms); | |
977 | rv = 0; | |
978 | mdstat_wait(5); | |
979 | } | |
980 | } |