forked from neilbrown/mdadm
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Monitor.c
1143 lines (1054 loc) · 28.6 KB
/
Monitor.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Neil Brown
* Email: <neilb@suse.de>
*/
#include "mdadm.h"
#include "md_p.h"
#include "md_u.h"
#include <sys/wait.h>
#include <signal.h>
#include <limits.h>
#include <syslog.h>
struct state {
char *devname;
char devnm[32]; /* to sync with mdstat info */
long utime;
int err;
char *spare_group;
int active, working, failed, spare, raid;
int from_config;
int from_auto;
int expected_spares;
int devstate[MAX_DISKS];
dev_t devid[MAX_DISKS];
int percent;
char parent_devnm[32]; /* For subarray, devnm of parent.
* For others, ""
*/
struct supertype *metadata;
struct state *subarray;/* for a container it is a link to first subarray
* for a subarray it is a link to next subarray
* in the same container */
struct state *parent; /* for a subarray it is a link to its container
*/
struct state *next;
};
struct alert_info {
char *mailaddr;
char *mailfrom;
char *alert_cmd;
int dosyslog;
};
static int make_daemon(char *pidfile);
static int check_one_sharer(int scan);
static void alert(char *event, char *dev, char *disc, struct alert_info *info);
static int check_array(struct state *st, struct mdstat_ent *mdstat,
int test, struct alert_info *info,
int increments, char *prefer);
static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist,
int test, struct alert_info *info);
static void try_spare_migration(struct state *statelist, struct alert_info *info);
static void link_containers_with_subarrays(struct state *list);
int Monitor(struct mddev_dev *devlist,
char *mailaddr, char *alert_cmd,
struct context *c,
int daemonise, int oneshot,
int dosyslog, char *pidfile, int increments,
int share)
{
/*
* Every few seconds, scan every md device looking for changes
* When a change is found, log it, possibly run the alert command,
* and possibly send Email
*
* For each array, we record:
* Update time
* active/working/failed/spare drives
* State of each device.
* %rebuilt if rebuilding
*
* If the update time changes, check out all the data again
* It is possible that we cannot get the state of each device
* due to bugs in the md kernel module.
* We also read /proc/mdstat to get rebuild percent,
* and to get state on all active devices incase of kernel bug.
*
* Events are:
* Fail
* An active device had Faulty set or Active/Sync removed
* FailSpare
* A spare device had Faulty set
* SpareActive
* An active device had a reverse transition
* RebuildStarted
* percent went from -1 to +ve
* RebuildNN
* percent went from below to not-below NN%
* DeviceDisappeared
* Couldn't access a device which was previously visible
*
* if we detect an array with active<raid and spare==0
* we look at other arrays that have same spare-group
* If we find one with active==raid and spare>0,
* and if we can get_disk_info and find a name
* Then we hot-remove and hot-add to the other array
*
* If devlist is NULL, then we can monitor everything because --scan
* was given. We get an initial list from config file and add anything
* that appears in /proc/mdstat
*/
struct state *statelist = NULL;
struct state *st2;
int finished = 0;
struct mdstat_ent *mdstat = NULL;
char *mailfrom = NULL;
struct alert_info info;
if (!mailaddr) {
mailaddr = conf_get_mailaddr();
if (mailaddr && ! c->scan)
pr_err("Monitor using email address \"%s\" from config file\n",
mailaddr);
}
mailfrom = conf_get_mailfrom();
if (!alert_cmd) {
alert_cmd = conf_get_program();
if (alert_cmd && ! c->scan)
pr_err("Monitor using program \"%s\" from config file\n",
alert_cmd);
}
if (c->scan && !mailaddr && !alert_cmd && !dosyslog) {
pr_err("No mail address or alert command - not monitoring.\n");
return 1;
}
info.alert_cmd = alert_cmd;
info.mailaddr = mailaddr;
info.mailfrom = mailfrom;
info.dosyslog = dosyslog;
if (daemonise) {
int rv = make_daemon(pidfile);
if (rv >= 0)
return rv;
}
if (share)
if (check_one_sharer(c->scan))
return 1;
if (devlist == NULL) {
struct mddev_ident *mdlist = conf_get_ident(NULL);
for (; mdlist; mdlist=mdlist->next) {
struct state *st;
if (mdlist->devname == NULL)
continue;
if (strcasecmp(mdlist->devname, "<ignore>") == 0)
continue;
st = xcalloc(1, sizeof *st);
if (mdlist->devname[0] == '/')
st->devname = xstrdup(mdlist->devname);
else {
st->devname = xmalloc(8+strlen(mdlist->devname)+1);
strcpy(strcpy(st->devname, "/dev/md/"),
mdlist->devname);
}
st->next = statelist;
st->devnm[0] = 0;
st->percent = RESYNC_UNKNOWN;
st->from_config = 1;
st->expected_spares = mdlist->spare_disks;
if (mdlist->spare_group)
st->spare_group = xstrdup(mdlist->spare_group);
statelist = st;
}
} else {
struct mddev_dev *dv;
for (dv=devlist ; dv; dv=dv->next) {
struct mddev_ident *mdlist = conf_get_ident(dv->devname);
struct state *st = xcalloc(1, sizeof *st);
st->devname = xstrdup(dv->devname);
st->next = statelist;
st->devnm[0] = 0;
st->percent = RESYNC_UNKNOWN;
st->expected_spares = -1;
if (mdlist) {
st->expected_spares = mdlist->spare_disks;
if (mdlist->spare_group)
st->spare_group = xstrdup(mdlist->spare_group);
}
statelist = st;
}
}
while (! finished) {
int new_found = 0;
struct state *st, **stp;
int anydegraded = 0;
if (mdstat)
free_mdstat(mdstat);
mdstat = mdstat_read(oneshot?0:1, 0);
for (st=statelist; st; st=st->next)
if (check_array(st, mdstat, c->test, &info,
increments, c->prefer))
anydegraded = 1;
/* now check if there are any new devices found in mdstat */
if (c->scan)
new_found = add_new_arrays(mdstat, &statelist, c->test,
&info);
/* If an array has active < raid && spare == 0 && spare_group != NULL
* Look for another array with spare > 0 and active == raid and same spare_group
* if found, choose a device and hotremove/hotadd
*/
if (share && anydegraded)
try_spare_migration(statelist, &info);
if (!new_found) {
if (oneshot)
break;
else
mdstat_wait(c->delay);
}
c->test = 0;
for (stp = &statelist; (st = *stp) != NULL; ) {
if (st->from_auto && st->err > 5) {
*stp = st->next;
free(st->devname);
free(st->spare_group);
free(st);
} else
stp = &st->next;
}
}
for (st2 = statelist; st2; st2 = statelist) {
statelist = st2->next;
free(st2);
}
if (pidfile)
unlink(pidfile);
return 0;
}
static int make_daemon(char *pidfile)
{
/* Return:
* -1 in the forked daemon
* 0 in the parent
* 1 on error
* so a none-negative becomes the exit code.
*/
int pid = fork();
if (pid > 0) {
if (!pidfile)
printf("%d\n", pid);
else {
FILE *pid_file;
pid_file=fopen(pidfile, "w");
if (!pid_file)
perror("cannot create pid file");
else {
fprintf(pid_file,"%d\n", pid);
fclose(pid_file);
}
}
return 0;
}
if (pid < 0) {
perror("daemonise");
return 1;
}
close(0);
open("/dev/null", O_RDWR);
dup2(0,1);
dup2(0,2);
setsid();
return -1;
}
static int check_one_sharer(int scan)
{
int pid, rv;
FILE *fp;
char dir[20];
char path[100];
struct stat buf;
sprintf(path, "%s/autorebuild.pid", MDMON_DIR);
fp = fopen(path, "r");
if (fp) {
if (fscanf(fp, "%d", &pid) != 1)
pid = -1;
sprintf(dir, "/proc/%d", pid);
rv = stat(dir, &buf);
if (rv != -1) {
if (scan) {
pr_err("Only one autorebuild process allowed in scan mode, aborting\n");
fclose(fp);
return 1;
} else {
pr_err("Warning: One autorebuild process already running.\n");
}
}
fclose(fp);
}
if (scan) {
if (mkdir(MDMON_DIR, S_IRWXU) < 0 &&
errno != EEXIST) {
pr_err("Can't create autorebuild.pid file\n");
} else {
fp = fopen(path, "w");
if (!fp)
pr_err("Cannot create autorebuild.pidfile\n");
else {
pid = getpid();
fprintf(fp, "%d\n", pid);
fclose(fp);
}
}
}
return 0;
}
static void alert(char *event, char *dev, char *disc, struct alert_info *info)
{
int priority;
if (!info->alert_cmd && !info->mailaddr && !info->dosyslog) {
time_t now = time(0);
printf("%1.15s: %s on %s %s\n", ctime(&now)+4, event, dev, disc?disc:"unknown device");
}
if (info->alert_cmd) {
int pid = fork();
switch(pid) {
default:
waitpid(pid, NULL, 0);
break;
case -1:
break;
case 0:
execl(info->alert_cmd, info->alert_cmd,
event, dev, disc, NULL);
exit(2);
}
}
if (info->mailaddr &&
(strncmp(event, "Fail", 4)==0 ||
strncmp(event, "Test", 4)==0 ||
strncmp(event, "Spares", 6)==0 ||
strncmp(event, "Degrade", 7)==0)) {
FILE *mp = popen(Sendmail, "w");
if (mp) {
FILE *mdstat;
char hname[256];
gethostname(hname, sizeof(hname));
signal(SIGPIPE, SIG_IGN);
if (info->mailfrom)
fprintf(mp, "From: %s\n", info->mailfrom);
else
fprintf(mp, "From: %s monitoring <root>\n", Name);
fprintf(mp, "To: %s\n", info->mailaddr);
fprintf(mp, "Subject: %s event on %s:%s\n\n",
event, dev, hname);
fprintf(mp,
"This is an automatically generated mail message from %s\n", Name);
fprintf(mp, "running on %s\n\n", hname);
fprintf(mp,
"A %s event had been detected on md device %s.\n\n", event, dev);
if (disc && disc[0] != ' ')
fprintf(mp,
"It could be related to component device %s.\n\n", disc);
if (disc && disc[0] == ' ')
fprintf(mp, "Extra information:%s.\n\n", disc);
fprintf(mp, "Faithfully yours, etc.\n");
mdstat = fopen("/proc/mdstat", "r");
if (mdstat) {
char buf[8192];
int n;
fprintf(mp,
"\nP.S. The /proc/mdstat file currently contains the following:\n\n");
while ( (n=fread(buf, 1, sizeof(buf), mdstat)) > 0)
n=fwrite(buf, 1, n, mp);
fclose(mdstat);
}
pclose(mp);
}
}
/* log the event to syslog maybe */
if (info->dosyslog) {
/* Log at a different severity depending on the event.
*
* These are the critical events: */
if (strncmp(event, "Fail", 4)==0 ||
strncmp(event, "Degrade", 7)==0 ||
strncmp(event, "DeviceDisappeared", 17)==0)
priority = LOG_CRIT;
/* Good to know about, but are not failures: */
else if (strncmp(event, "Rebuild", 7)==0 ||
strncmp(event, "MoveSpare", 9)==0 ||
strncmp(event, "Spares", 6) != 0)
priority = LOG_WARNING;
/* Everything else: */
else
priority = LOG_INFO;
if (disc && disc[0] != ' ')
syslog(priority,
"%s event detected on md device %s, component device %s", event, dev, disc);
else if (disc)
syslog(priority,
"%s event detected on md device %s: %s",
event, dev, disc);
else
syslog(priority,
"%s event detected on md device %s",
event, dev);
}
}
static int check_array(struct state *st, struct mdstat_ent *mdstat,
int test, struct alert_info *ainfo,
int increments, char *prefer)
{
/* Update the state 'st' to reflect any changes shown in mdstat,
* or found by directly examining the array, and return
* '1' if the array is degraded, or '0' if it is optimal (or dead).
*/
struct { int state, major, minor; } info[MAX_DISKS];
mdu_array_info_t array;
struct mdstat_ent *mse = NULL, *mse2;
char *dev = st->devname;
int fd = -1;
int i;
int remaining_disks;
int last_disk;
int new_array = 0;
if (test)
alert("TestMessage", dev, NULL, ainfo);
if (st->devnm[0])
fd = open("/sys/block", O_RDONLY|O_DIRECTORY);
if (fd >= 0) {
/* Don't open the device unless it is present and
* active in sysfs.
*/
char buf[10];
close(fd);
fd = sysfs_open(st->devnm, NULL, "array_state");
if (fd < 0 ||
read(fd, buf, 10) < 5 ||
strncmp(buf,"clear",5) == 0 ||
strncmp(buf,"inact",5) == 0) {
if (fd >= 0)
close(fd);
fd = sysfs_open(st->devnm, NULL, "level");
if (fd < 0 || read(fd, buf, 10) != 0) {
if (fd >= 0)
close(fd);
if (!st->err)
alert("DeviceDisappeared", dev, NULL, ainfo);
st->err++;
return 0;
}
}
close(fd);
}
fd = open(dev, O_RDONLY);
if (fd < 0) {
if (!st->err)
alert("DeviceDisappeared", dev, NULL, ainfo);
st->err++;
return 0;
}
fcntl(fd, F_SETFD, FD_CLOEXEC);
if (ioctl(fd, GET_ARRAY_INFO, &array)<0) {
if (!st->err)
alert("DeviceDisappeared", dev, NULL, ainfo);
st->err++;
close(fd);
return 0;
}
/* It's much easier to list what array levels can't
* have a device disappear than all of them that can
*/
if (array.level == 0 || array.level == -1) {
if (!st->err && !st->from_config)
alert("DeviceDisappeared", dev, " Wrong-Level", ainfo);
st->err++;
close(fd);
return 0;
}
if (st->devnm[0] == 0)
strcpy(st->devnm, fd2devnm(fd));
for (mse2 = mdstat ; mse2 ; mse2=mse2->next)
if (strcmp(mse2->devnm, st->devnm) == 0) {
mse2->devnm[0] = 0; /* flag it as "used" */
mse = mse2;
}
if (!mse) {
/* duplicated array in statelist
* or re-created after reading mdstat*/
st->err++;
close(fd);
return 0;
}
/* this array is in /proc/mdstat */
if (array.utime == 0)
/* external arrays don't update utime, so
* just make sure it is always different. */
array.utime = st->utime + 1;;
if (st->err) {
/* New array appeared where previously had an error */
st->err = 0;
st->percent = RESYNC_NONE;
new_array = 1;
alert("NewArray", st->devname, NULL, ainfo);
}
if (st->utime == array.utime &&
st->failed == array.failed_disks &&
st->working == array.working_disks &&
st->spare == array.spare_disks &&
(mse == NULL || (
mse->percent == st->percent
))) {
close(fd);
if ((st->active < st->raid) && st->spare == 0)
return 1;
else
return 0;
}
if (st->utime == 0 && /* new array */
mse->pattern && strchr(mse->pattern, '_') /* degraded */
)
alert("DegradedArray", dev, NULL, ainfo);
if (st->utime == 0 && /* new array */
st->expected_spares > 0 &&
array.spare_disks < st->expected_spares)
alert("SparesMissing", dev, NULL, ainfo);
if (st->percent < 0 && st->percent != RESYNC_UNKNOWN &&
mse->percent >= 0)
alert("RebuildStarted", dev, NULL, ainfo);
if (st->percent >= 0 &&
mse->percent >= 0 &&
(mse->percent / increments) > (st->percent / increments)) {
char percentalert[15]; // "RebuildNN" (10 chars) or "RebuildStarted" (15 chars)
if((mse->percent / increments) == 0)
snprintf(percentalert, sizeof(percentalert), "RebuildStarted");
else
snprintf(percentalert, sizeof(percentalert), "Rebuild%02d", mse->percent);
alert(percentalert, dev, NULL, ainfo);
}
if (mse->percent == RESYNC_NONE &&
st->percent >= 0) {
/* Rebuild/sync/whatever just finished.
* If there is a number in /mismatch_cnt,
* we should report that.
*/
struct mdinfo *sra =
sysfs_read(-1, st->devnm, GET_MISMATCH);
if (sra && sra->mismatch_cnt > 0) {
char cnt[80];
snprintf(cnt, sizeof(cnt),
" mismatches found: %d (on raid level %d)",
sra->mismatch_cnt, array.level);
alert("RebuildFinished", dev, cnt, ainfo);
} else
alert("RebuildFinished", dev, NULL, ainfo);
if (sra)
free(sra);
}
st->percent = mse->percent;
remaining_disks = array.nr_disks;
for (i=0; i<MAX_DISKS && remaining_disks > 0;
i++) {
mdu_disk_info_t disc;
disc.number = i;
if (ioctl(fd, GET_DISK_INFO, &disc) >= 0) {
info[i].state = disc.state;
info[i].major = disc.major;
info[i].minor = disc.minor;
if (disc.major || disc.minor)
remaining_disks --;
} else
info[i].major = info[i].minor = 0;
}
last_disk = i;
if (mse->metadata_version &&
strncmp(mse->metadata_version, "external:", 9) == 0 &&
is_subarray(mse->metadata_version+9)) {
char *sl;
strcpy(st->parent_devnm,
mse->metadata_version+10);
sl = strchr(st->parent_devnm, '/');
if (sl)
*sl = 0;
} else
st->parent_devnm[0] = 0;
if (st->metadata == NULL &&
st->parent_devnm[0] == 0)
st->metadata = super_by_fd(fd, NULL);
close(fd);
for (i=0; i<MAX_DISKS; i++) {
mdu_disk_info_t disc = {0,0,0,0,0};
int newstate=0;
int change;
char *dv = NULL;
disc.number = i;
if (i < last_disk &&
(info[i].major || info[i].minor)) {
newstate = info[i].state;
dv = map_dev_preferred(
info[i].major, info[i].minor, 1,
prefer);
disc.state = newstate;
disc.major = info[i].major;
disc.minor = info[i].minor;
} else
newstate = (1 << MD_DISK_REMOVED);
if (dv == NULL && st->devid[i])
dv = map_dev_preferred(
major(st->devid[i]),
minor(st->devid[i]), 1, prefer);
change = newstate ^ st->devstate[i];
if (st->utime && change && !st->err && !new_array) {
if ((st->devstate[i]&change)&(1<<MD_DISK_SYNC))
alert("Fail", dev, dv, ainfo);
else if ((newstate & (1<<MD_DISK_FAULTY)) &&
(disc.major || disc.minor) &&
st->devid[i] == makedev(disc.major, disc.minor))
alert("FailSpare", dev, dv, ainfo);
else if ((newstate&change)&(1<<MD_DISK_SYNC))
alert("SpareActive", dev, dv, ainfo);
}
st->devstate[i] = newstate;
st->devid[i] = makedev(disc.major, disc.minor);
}
st->active = array.active_disks;
st->working = array.working_disks;
st->spare = array.spare_disks;
st->failed = array.failed_disks;
st->utime = array.utime;
st->raid = array.raid_disks;
st->err = 0;
if ((st->active < st->raid) && st->spare == 0)
return 1;
return 0;
}
static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist,
int test, struct alert_info *info)
{
struct mdstat_ent *mse;
int new_found = 0;
char *name;
for (mse=mdstat; mse; mse=mse->next)
if (mse->devnm[0] &&
(!mse->level || /* retrieve containers */
(strcmp(mse->level, "raid0") != 0 &&
strcmp(mse->level, "linear") != 0))
) {
struct state *st = xcalloc(1, sizeof *st);
mdu_array_info_t array;
int fd;
name = get_md_name(mse->devnm);
if (!name) {
free(st);
continue;
}
st->devname = xstrdup(name);
if ((fd = open(st->devname, O_RDONLY)) < 0 ||
ioctl(fd, GET_ARRAY_INFO, &array)< 0) {
/* no such array */
if (fd >=0) close(fd);
put_md_name(st->devname);
free(st->devname);
if (st->metadata) {
st->metadata->ss->free_super(st->metadata);
free(st->metadata);
}
free(st);
continue;
}
close(fd);
st->next = *statelist;
st->err = 1;
st->from_auto = 1;
strcpy(st->devnm, mse->devnm);
st->percent = RESYNC_UNKNOWN;
st->expected_spares = -1;
if (mse->metadata_version &&
strncmp(mse->metadata_version, "external:", 9) == 0 &&
is_subarray(mse->metadata_version+9)) {
char *sl;
strcpy(st->parent_devnm,
mse->metadata_version+10);
sl = strchr(st->parent_devnm, '/');
*sl = 0;
} else
st->parent_devnm[0] = 0;
*statelist = st;
if (test)
alert("TestMessage", st->devname, NULL, info);
new_found = 1;
}
return new_found;
}
static int get_min_spare_size_required(struct state *st, unsigned long long *sizep)
{
int fd;
if (!st->metadata ||
!st->metadata->ss->min_acceptable_spare_size) {
*sizep = 0;
return 0;
}
fd = open(st->devname, O_RDONLY);
if (fd < 0)
return 1;
if (st->metadata->ss->external)
st->metadata->ss->load_container(st->metadata, fd, st->devname);
else
st->metadata->ss->load_super(st->metadata, fd, st->devname);
close(fd);
if (!st->metadata->sb)
return 1;
*sizep = st->metadata->ss->min_acceptable_spare_size(st->metadata);
st->metadata->ss->free_super(st->metadata);
return 0;
}
static int check_donor(struct state *from, struct state *to)
{
struct state *sub;
if (from == to)
return 0;
if (from->parent)
/* Cannot move from a member */
return 0;
if (from->err)
return 0;
for (sub = from->subarray; sub; sub = sub->subarray)
/* If source array has degraded subarrays, don't
* remove anything
*/
if (sub->active < sub->raid)
return 0;
if (from->metadata->ss->external == 0)
if (from->active < from->raid)
return 0;
if (from->spare <= 0)
return 0;
return 1;
}
static dev_t choose_spare(struct state *from, struct state *to,
struct domainlist *domlist, unsigned long long min_size)
{
int d;
dev_t dev = 0;
for (d = from->raid; !dev && d < MAX_DISKS; d++) {
if (from->devid[d] > 0 &&
from->devstate[d] == 0) {
struct dev_policy *pol;
unsigned long long dev_size;
if (to->metadata->ss->external &&
test_partition_from_id(from->devid[d]))
continue;
if (min_size &&
dev_size_from_id(from->devid[d], &dev_size) &&
dev_size < min_size)
continue;
pol = devid_policy(from->devid[d]);
if (from->spare_group)
pol_add(&pol, pol_domain,
from->spare_group, NULL);
if (domain_test(domlist, pol, to->metadata->ss->name) == 1)
dev = from->devid[d];
dev_policy_free(pol);
}
}
return dev;
}
static dev_t container_choose_spare(struct state *from, struct state *to,
struct domainlist *domlist,
unsigned long long min_size, int active)
{
/* This is similar to choose_spare, but we cannot trust devstate,
* so we need to read the metadata instead
*/
struct mdinfo *list;
struct supertype *st = from->metadata;
int fd = open(from->devname, O_RDONLY);
int err;
dev_t dev = 0;
if (fd < 0)
return 0;
if (!st->ss->getinfo_super_disks) {
close(fd);
return 0;
}
err = st->ss->load_container(st, fd, NULL);
close(fd);
if (err)
return 0;
if (from == to) {
/* We must check if number of active disks has not increased
* since ioctl in main loop. mdmon may have added spare
* to subarray. If so we do not need to look for more spares
* so return non zero value */
int active_cnt = 0;
struct mdinfo *dp;
list = st->ss->getinfo_super_disks(st);
if (!list) {
st->ss->free_super(st);
return 1;
}
dp = list->devs;
while (dp) {
if (dp->disk.state & (1<<MD_DISK_SYNC) &&
!(dp->disk.state & (1<<MD_DISK_FAULTY)))
active_cnt++;
dp = dp->next;
}
sysfs_free(list);
if (active < active_cnt) {
/* Spare just activated.*/
st->ss->free_super(st);
return 1;
}
}
/* We only need one spare so full list not needed */
list = container_choose_spares(st, min_size, domlist, from->spare_group,
to->metadata->ss->name, 1);
if (list) {
struct mdinfo *disks = list->devs;
if (disks)
dev = makedev(disks->disk.major, disks->disk.minor);
sysfs_free(list);
}
st->ss->free_super(st);
return dev;
}
static void try_spare_migration(struct state *statelist, struct alert_info *info)
{
struct state *from;
struct state *st;
link_containers_with_subarrays(statelist);
for (st = statelist; st; st = st->next)
if (st->active < st->raid &&
st->spare == 0 && !st->err) {
struct domainlist *domlist = NULL;
int d;
struct state *to = st;
unsigned long long min_size;
if (to->parent_devnm[0] && !to->parent)
/* subarray monitored without parent container
* we can't move spares here */
continue;
if (to->parent)
/* member of a container */
to = to->parent;
if (get_min_spare_size_required(to, &min_size))
continue;
if (to->metadata->ss->external) {
/* We must make sure there is
* no suitable spare in container already.
* If there is we don't add more */
dev_t devid = container_choose_spare(
to, to, NULL, min_size, st->active);
if (devid > 0)
continue;
}
for (d = 0; d < MAX_DISKS; d++)
if (to->devid[d])
domainlist_add_dev(&domlist,
to->devid[d],
to->metadata->ss->name);
if (to->spare_group)
domain_add(&domlist, to->spare_group);
/*
* No spare migration if the destination
* has no domain. Skip this array.
*/
if (!domlist)
continue;
for (from=statelist ; from ; from=from->next) {
dev_t devid;
if (!check_donor(from, to))
continue;
if (from->metadata->ss->external)
devid = container_choose_spare(
from, to, domlist, min_size, 0);
else
devid = choose_spare(from, to, domlist,
min_size);
if (devid > 0
&& move_spare(from->devname, to->devname, devid)) {
alert("MoveSpare", to->devname, from->devname, info);
break;
}
}
domain_free(domlist);
}
}
/* search the statelist to connect external
* metadata subarrays with their containers
* We always completely rebuild the tree from scratch as
* that is safest considering the possibility of entries
* disappearing or changing.
*/
static void link_containers_with_subarrays(struct state *list)
{
struct state *st;
struct state *cont;
for (st = list; st; st = st->next) {
st->parent = NULL;
st->subarray = NULL;
}
for (st = list; st; st = st->next)
if (st->parent_devnm[0])
for (cont = list; cont; cont = cont->next)
if (!cont->err &&
cont->parent_devnm[0] == 0 &&
strcmp(cont->devnm, st->parent_devnm) == 0) {
st->parent = cont;
st->subarray = cont->subarray;
cont->subarray = st;
break;
}
}
/* Not really Monitor but ... */
int Wait(char *dev)
{
struct stat stb;
char devnm[32];
int rv = 1;
int frozen_remaining = 3;
if (stat(dev, &stb) != 0) {
pr_err("Cannot find %s: %s\n", dev,
strerror(errno));