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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
|
/*-
* Copyright (c) 1997, 1998, 1999
* Nan Yang Computer Services Limited. All rights reserved.
*
* Parts copyright (c) 1997, 1998 Cybernet Corporation, NetMAX project.
*
* Written by Greg Lehey
*
* This software is distributed under the so-called ``Berkeley
* License'':
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Nan Yang Computer
* Services Limited.
* 4. Neither the name of the Company nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* This software is provided ``as is'', and any express or implied
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose are disclaimed.
* In no event shall the company or contributors be liable for any
* direct, indirect, incidental, special, exemplary, or consequential
* damages (including, but not limited to, procurement of substitute
* goods or services; loss of use, data, or profits; or business
* interruption) however caused and on any theory of liability, whether
* in contract, strict liability, or tort (including negligence or
* otherwise) arising in any way out of the use of this software, even if
* advised of the possibility of such damage.
*
* $Id: vinumstate.c,v 2.15 2000/01/04 04:39:25 grog Exp grog $
* $FreeBSD$
*/
#include <dev/vinum/vinumhdr.h>
#include <dev/vinum/request.h>
/* Update drive state */
/* Return 1 if the state changes, otherwise 0 */
int
set_drive_state(int driveno, enum drivestate newstate, enum setstateflags flags)
{
struct drive *drive = &DRIVE[driveno];
int oldstate = drive->state;
int sdno;
if (drive->state == drive_unallocated) /* no drive to do anything with, */
return 0;
if (newstate == oldstate) /* don't change it if it's not different */
return 1; /* all OK */
if ((newstate == drive_down) /* the drive's going down */
&&(!(flags & setstate_force))
&& (drive->opencount != 0)) /* we can't do it */
return 0; /* don't do it */
drive->state = newstate; /* set the state */
if (drive->label.name[0] != '\0') /* we have a name, */
log(LOG_INFO,
"vinum: drive %s is %s\n",
drive->label.name,
drive_state(drive->state));
if (drive->state != oldstate) { /* state has changed */
for (sdno = 0; sdno < vinum_conf.subdisks_allocated; sdno++) { /* find this drive's subdisks */
if ((SD[sdno].state >= sd_referenced)
&& (SD[sdno].driveno == driveno)) /* belongs to this drive */
update_sd_state(sdno); /* update the state */
}
}
if (newstate == drive_up) { /* want to bring it up */
if ((drive->flags & VF_OPEN) == 0) /* should be open, but we're not */
init_drive(drive, 1); /* which changes the state again */
} else /* taking it down or worse */
queue_daemon_request(daemonrq_closedrive, /* get the daemon to close it */
(union daemoninfo) drive);
if ((flags & setstate_configuring) == 0) /* configuring? */
save_config(); /* no: save the updated configuration now */
return 1;
}
/*
* Try to set the subdisk state. Return 1 if state changed to
* what we wanted, -1 if it changed to something else, and 0
* if no change.
*
* This routine is called both from the user (up, down states only)
* and internally.
*
* The setstate_force bit in the flags enables the state change even
* if it could be dangerous to data consistency. It shouldn't allow
* nonsense.
*/
int
set_sd_state(int sdno, enum sdstate newstate, enum setstateflags flags)
{
struct sd *sd = &SD[sdno];
struct plex *plex;
struct volume *vol;
int oldstate = sd->state;
int status = 1; /* status to return */
if (newstate == oldstate) /* already there, */
return 1;
else if (sd->state == sd_unallocated) /* no subdisk to do anything with, */
return 0; /* can't do it */
if (sd->driveoffset < 0) { /* not allocated space */
sd->state = sd_down;
if (newstate != sd_down) {
if (sd->plexno >= 0)
sdstatemap(&PLEX[sd->plexno]); /* count up subdisks */
return -1;
}
} else { /* space allocated */
switch (newstate) {
case sd_down: /* take it down? */
/*
* If we're attached to a plex, and we're
* not reborn, we won't go down without
* use of force.
*/
if ((!flags & setstate_force)
&& (sd->plexno >= 0)
&& (sd->state != sd_reborn))
return 0; /* don't do it */
break;
case sd_initialized:
if ((sd->state == sd_initializing) /* we were initializing */
||(flags & setstate_force)) /* or we forced it */
break;
return 0; /* can't do it otherwise */
case sd_up:
if (DRIVE[sd->driveno].state != drive_up) /* can't bring the sd up if the drive isn't, */
return 0; /* not even by force */
if (flags & setstate_force) /* forcing it, */
break; /* just do it, and damn the consequences */
switch (sd->state) {
/*
* Perform the necessary tests. To allow
* the state transition, just break out of
* the switch.
*/
case sd_crashed:
case sd_reborn:
case sd_down: /* been down, no data lost */
/*
* If we're associated with a plex, and
* the plex isn't up, or we're the only
* subdisk in the plex, we can do it.
*/
if ((sd->plexno >= 0)
&& (((PLEX[sd->plexno].state < plex_firstup)
|| (PLEX[sd->plexno].subdisks > 1))))
break; /* do it */
if (oldstate != sd_reborn) {
sd->state = sd_reborn; /* here it is again */
log(LOG_INFO,
"vinum: %s is %s, not %s\n",
sd->name,
sd_state(sd->state),
sd_state(newstate));
}
status = -1;
break;
case sd_init: /* brand new */
if (flags & setstate_configuring) /* we're doing this while configuring */
break;
/* otherwise it's like being empty */
/* FALLTHROUGH */
case sd_empty:
case sd_initialized:
/*
* If we're not part of a plex, or the
* plex is not part of a volume with other
* plexes which are up, we can come up
* without being inconsistent.
*
* If we're part of a parity plex, we'll
* come up if the caller uses force. This
* is the way we bring them up after
* initialization.
*/
if ((sd->plexno < 0)
|| ((vpstate(&PLEX[sd->plexno]) & volplex_otherup) == 0)
|| (isparity((&PLEX[sd->plexno]))
&& (flags & setstate_force)))
break;
/* Otherwise it's just out of date */
/* FALLTHROUGH */
case sd_stale: /* out of date info, need reviving */
case sd_obsolete:
/*
* 1. If the subdisk is not part of a
* plex, bring it up, don't revive.
*
* 2. If the subdisk is part of a
* one-plex volume or an unattached
* plex, and it's not RAID-4 or
* RAID-5, we *can't revive*. The
* subdisk doesn't change its state.
*
* 3. If the subdisk is part of a
* one-plex volume or an unattached
* plex, and it's RAID-4 or RAID-5,
* but more than one subdisk is down,
* we *still can't revive*. The
* subdisk doesn't change its state.
*
* 4. If the subdisk is part of a
* multi-plex volume, we'll change to
* reviving and let the revive
* routines find out whether it will
* work or not. If they don't, the
* revive stops with an error message,
* but the state doesn't change
* (FWIW).
*/
if (sd->plexno < 0) /* no plex associated, */
break; /* bring it up */
plex = &PLEX[sd->plexno];
if (plex->volno >= 0) /* have a volume */
vol = &VOL[plex->volno];
else
vol = NULL;
/*
* We can't do it if:
*
* 1: we don't have a volume
* 2: we're the only plex in the volume
* 3: we're a RAID-4 or RAID-5 plex, and
* more than one subdisk is down.
*/
if (((vol == NULL)
|| (vol->plexes == 1))
&& ((!isparity(plex))
|| (plex->sddowncount > 1))) {
if (sd->state == sd_initializing) /* it's finished initializing */
sd->state = sd_initialized;
else
return 0; /* can't do it */
} else {
sd->state = sd_reviving; /* put in reviving state */
sd->revived = 0; /* nothing done yet */
status = EAGAIN; /* need to repeat */
}
break;
case sd_reviving:
if (flags & setstate_force) /* insist, */
break;
return EAGAIN; /* no, try again */
default: /* can't do it */
/*
* There's no way to bring subdisks up directly from
* other states. First they need to be initialized
* or revived.
*/
return 0;
}
break;
default: /* other ones, only internal with force */
if ((flags & setstate_force) == 0) /* no force? What's this? */
return 0; /* don't do it */
}
}
if (status == 1) { /* we can do it, */
sd->state = newstate;
if (flags & setstate_force)
log(LOG_INFO, "vinum: %s is %s by force\n", sd->name, sd_state(sd->state));
else
log(LOG_INFO, "vinum: %s is %s\n", sd->name, sd_state(sd->state));
} else /* we don't get here with status 0 */
log(LOG_INFO,
"vinum: %s is %s, not %s\n",
sd->name,
sd_state(sd->state),
sd_state(newstate));
if (sd->plexno >= 0) /* we belong to a plex */
update_plex_state(sd->plexno); /* update plex state */
if ((flags & setstate_configuring) == 0) /* save config now */
save_config();
return status;
}
/*
* Set the state of a plex dependent on its subdisks.
* This time round, we'll let plex state just reflect
* aggregate subdisk state, so this becomes an order of
* magnitude less complicated. In particular, ignore
* the requested state.
*/
int
set_plex_state(int plexno, enum plexstate state, enum setstateflags flags)
{
struct plex *plex; /* point to our plex */
enum plexstate oldstate;
enum volplexstate vps; /* how do we compare with the other plexes? */
plex = &PLEX[plexno]; /* point to our plex */
oldstate = plex->state;
/* If the plex isn't allocated, we can't do it. */
if (plex->state == plex_unallocated)
return 0;
/*
* If it's already in the the state we want,
* and it's not up, just return. If it's up,
* we still need to do some housekeeping.
*/
if ((state == oldstate)
&& (state != plex_up))
return 1;
vps = vpstate(plex); /* how do we compare with the other plexes? */
switch (state) {
/*
* We can't bring the plex up, even by force,
* unless it's ready. update_plex_state
* checks that.
*/
case plex_up: /* bring the plex up */
update_plex_state(plex->plexno); /* it'll come up if it can */
break;
case plex_down: /* want to take it down */
/*
* If we're the only one, or the only one
* which is up, we need force to do it.
*/
if (((vps == volplex_onlyus)
|| (vps == volplex_onlyusup))
&& (!(flags & setstate_force)))
return 0; /* can't do it */
plex->state = state; /* do it */
invalidate_subdisks(plex, sd_down); /* and down all up subdisks */
break;
/*
* This is only requested internally.
* Trust ourselves
*/
case plex_faulty:
plex->state = state; /* do it */
invalidate_subdisks(plex, sd_crashed); /* and crash all up subdisks */
break;
case plex_initializing:
/* XXX consider what safeguards we need here */
if ((flags & setstate_force) == 0)
return 0;
plex->state = state; /* do it */
break;
/* What's this? */
default:
return 0;
}
if (plex->state != oldstate) /* we've changed, */
log(LOG_INFO, /* tell them about it */
"vinum: %s is %s\n",
plex->name,
plex_state(plex->state));
/*
* Now see what we have left, and whether
* we're taking the volume down
*/
if (plex->volno >= 0) /* we have a volume */
update_volume_state(plex->volno); /* update its state */
if ((flags & setstate_configuring) == 0) /* save config now */
save_config(); /* yes: save the updated configuration */
return 1;
}
/* Update the state of a plex dependent on its plexes. */
int
set_volume_state(int volno, enum volumestate state, enum setstateflags flags)
{
struct volume *vol = &VOL[volno]; /* point to our volume */
if (vol->state == volume_unallocated) /* no volume to do anything with, */
return 0;
if (vol->state == state) /* we're there already */
return 1;
if (state == volume_up) /* want to come up */
update_volume_state(volno);
else if (state == volume_down) { /* want to go down */
if (((vol->flags & VF_OPEN) == 0) /* not open */
||((flags & setstate_force) != 0)) { /* or we're forcing */
vol->state = volume_down;
log(LOG_INFO,
"vinum: volume %s is %s\n",
vol->name,
volume_state(vol->state));
if ((flags & setstate_configuring) == 0) /* save config now */
save_config(); /* yes: save the updated configuration */
return 1;
}
}
return 0; /* no change */
}
/* Set the state of a subdisk based on its environment */
void
update_sd_state(int sdno)
{
struct sd *sd;
struct drive *drive;
enum sdstate oldstate;
sd = &SD[sdno];
oldstate = sd->state;
drive = &DRIVE[sd->driveno];
if (drive->state == drive_up) {
switch (sd->state) {
case sd_down:
case sd_crashed:
sd->state = sd_reborn; /* back up again with no loss */
break;
default:
break;
}
} else { /* down or worse */
switch (sd->state) {
case sd_up:
case sd_reborn:
case sd_reviving:
case sd_empty:
sd->state = sd_crashed; /* lost our drive */
break;
default:
break;
}
}
if (sd->state != oldstate) /* state has changed, */
log(LOG_INFO, /* say so */
"vinum: %s is %s\n",
sd->name,
sd_state(sd->state));
if (sd->plexno >= 0) /* we're part of a plex, */
update_plex_state(sd->plexno); /* update its state */
}
/*
* Force a plex and all its subdisks
* into an 'up' state. This is a helper
* for update_plex_state.
*/
void
forceup(int plexno)
{
struct plex *plex;
int sdno;
plex = &PLEX[plexno]; /* point to the plex */
plex->state = plex_up; /* and bring it up */
/* change the subdisks to up state */
for (sdno = 0; sdno < plex->subdisks; sdno++) {
SD[plex->sdnos[sdno]].state = sd_up;
log(LOG_INFO, /* tell them about it */
"vinum: %s is up\n",
SD[plex->sdnos[sdno]].name);
}
}
/* Set the state of a plex based on its environment */
void
update_plex_state(int plexno)
{
struct plex *plex; /* point to our plex */
enum plexstate oldstate;
enum sdstates statemap; /* get a map of the subdisk states */
enum volplexstate vps; /* how do we compare with the other plexes? */
plex = &PLEX[plexno]; /* point to our plex */
oldstate = plex->state;
statemap = sdstatemap(plex); /* get a map of the subdisk states */
vps = vpstate(plex); /* how do we compare with the other plexes? */
if (statemap & sd_initstate) /* something initializing? */
plex->state = plex_initializing; /* yup, that makes the plex the same */
else if (statemap == sd_upstate)
/*
* All the subdisks are up. This also means that
* they are consistent, so we can just bring
* the plex up
*/
plex->state = plex_up;
else if (isparity(plex) /* RAID-4 or RAID-5 plex */
&&(plex->sddowncount == 1)) /* and exactly one subdisk down */
plex->state = plex_degraded; /* limping a bit */
else if (((statemap & ~sd_downstate) == sd_emptystate) /* all subdisks empty */
||((statemap & ~sd_downstate)
== (statemap & ~sd_downstate & (sd_initializedstate | sd_upstate)))) {
if ((vps & volplex_otherup) == 0) { /* no other plex is up */
struct volume *vol = &VOL[plex->volno]; /* possible volume to which it points */
/*
* If we're a striped or concat plex
* associated with a volume, none of whose
* plexes are up, and we're new and untested,
* and the volume has the setupstate bit set,
* we can pretend to be in a consistent state.
*
* We need to do this in one swell foop: on
* the next call we will no longer be just
* empty.
*
* This code assumes that all the other plexes
* are also capable of coming up (i.e. all the
* sds are up), but that's OK: we'll come back
* to this function for the remaining plexes
* in the volume.
*/
if ((plex->state == plex_init)
&& (plex->volno >= 0)
&& (vol->flags & VF_CONFIG_SETUPSTATE)) {
for (plexno = 0; plexno < vol->plexes; plexno++)
forceup(VOL[plex->volno].plex[plexno]);
} else if ((statemap == sd_initializedstate) /* if it's initialized (not empty) */
||(plex->organization == plex_concat) /* and we're not RAID-4 or RAID-5 */
||(plex->organization == plex_striped))
forceup(plexno); /* we'll do it */
/*
* This leaves a case where things don't get
* done: the plex is RAID-4 or RAID-5, and
* the subdisks are all empty. They need to
* be initialized first.
*/
} else {
if (statemap == sd_upstate) /* all subdisks up */
plex->state = plex_up; /* we can come up too */
else
plex->state = plex_faulty;
}
} else if ((statemap & (sd_upstate | sd_rebornstate)) == statemap) /* all up or reborn */
plex->state = plex_flaky;
else if (statemap & (sd_upstate | sd_rebornstate)) /* some up or reborn */
plex->state = plex_corrupt; /* corrupt */
else if (statemap & (sd_initstate | sd_emptystate)) /* some subdisks empty or initializing */
plex->state = plex_initializing;
else /* nothing at all up */
plex->state = plex_faulty;
if (plex->state != oldstate) /* state has changed, */
log(LOG_INFO, /* tell them about it */
"vinum: %s is %s\n",
plex->name,
plex_state(plex->state));
if (plex->volno >= 0) /* we're part of a volume, */
update_volume_state(plex->volno); /* update its state */
}
/* Set volume state based on its components */
void
update_volume_state(int volno)
{
struct volume *vol; /* our volume */
int plexno;
enum volumestate oldstate;
vol = &VOL[volno]; /* point to our volume */
oldstate = vol->state;
for (plexno = 0; plexno < vol->plexes; plexno++) {
struct plex *plex = &PLEX[vol->plex[plexno]]; /* point to the plex */
if (plex->state >= plex_corrupt) { /* something accessible, */
vol->state = volume_up;
break;
}
}
if (plexno == vol->plexes) /* didn't find an up plex */
vol->state = volume_down;
if (vol->state != oldstate) { /* state changed */
log(LOG_INFO, "vinum: %s is %s\n", vol->name, volume_state(vol->state));
save_config(); /* save the updated configuration */
}
}
/*
* Called from request routines when they find
* a subdisk which is not kosher. Decide whether
* it warrants changing the state. Return
* REQUEST_DOWN if we can't use the subdisk,
* REQUEST_OK if we can.
*/
/*
* A prior version of this function checked the plex
* state as well. At the moment, consider plex states
* information for the user only. We'll ignore them
* and use the subdisk state only. The last version of
* this file with the old logic was 2.7. XXX
*/
enum requeststatus
checksdstate(struct sd *sd, struct request *rq, daddr_t diskaddr, daddr_t diskend)
{
struct plex *plex = &PLEX[sd->plexno];
int writeop = (rq->bp->b_flags & B_READ) == 0; /* note if we're writing */
switch (sd->state) {
/* We shouldn't get called if the subdisk is up */
case sd_up:
return REQUEST_OK;
case sd_reviving:
/*
* Access to a reviving subdisk depends on the
* organization of the plex:
*
* - If it's concatenated, access the subdisk
* up to its current revive point. If we
* want to write to the subdisk overlapping
* the current revive block, set the
* conflict flag in the request, asking the
* caller to put the request on the wait
* list, which will be attended to by
* revive_block when it's done.
* - if it's striped, we can't do it (we could
* do some hairy calculations, but it's
* unlikely to work).
* - if it's RAID-4 or RAID-5, we can do it as
* long as only one subdisk is down
*/
if (plex->state == plex_striped) /* plex is striped, */
return REQUEST_DOWN;
else if (isparity(plex)) { /* RAID-4 or RAID-5 plex */
if (plex->sddowncount > 1) /* with more than one sd down, */
return REQUEST_DOWN;
else
/*
* XXX We shouldn't do this if we can find a
* better way. Check the other plexes
* first, and return a DOWN if another
* plex will do it better
*/
return REQUEST_OK; /* OK, we'll find a way */
}
if (diskaddr > (sd->revived
+ sd->plexoffset
+ (sd->revive_blocksize >> DEV_BSHIFT))) /* we're beyond the end */
return REQUEST_DOWN;
else if (diskend > (sd->revived + sd->plexoffset)) { /* we finish beyond the end */
if (writeop) {
rq->flags |= XFR_REVIVECONFLICT; /* note a potential conflict */
rq->sdno = sd->sdno; /* and which sd last caused it */
} else
return REQUEST_DOWN;
}
return REQUEST_OK;
case sd_reborn:
if (writeop)
return REQUEST_OK; /* always write to a reborn disk */
else /* don't allow a read */
/*
* Handle the mapping. We don't want to reject
* a read request to a reborn subdisk if that's
* all we have. XXX
*/
return REQUEST_DOWN;
case sd_down:
if (writeop) /* writing to a consistent down disk */
set_sd_state(sd->sdno, sd_obsolete, setstate_force); /* it's not consistent now */
return REQUEST_DOWN;
case sd_crashed:
if (writeop) /* writing to a consistent down disk */
set_sd_state(sd->sdno, sd_stale, setstate_force); /* it's not consistent now */
return REQUEST_DOWN;
default:
return REQUEST_DOWN;
}
}
/* return a state map for the subdisks of a plex */
enum sdstates
sdstatemap(struct plex *plex)
{
int sdno;
enum sdstates statemap = 0; /* note the states we find */
plex->sddowncount = 0; /* no subdisks down yet */
for (sdno = 0; sdno < plex->subdisks; sdno++) {
struct sd *sd = &SD[plex->sdnos[sdno]]; /* point to the subdisk */
switch (sd->state) {
case sd_empty:
statemap |= sd_emptystate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_init:
statemap |= sd_initstate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_down:
statemap |= sd_downstate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_crashed:
statemap |= sd_crashedstate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_obsolete:
statemap |= sd_obsoletestate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_stale:
statemap |= sd_stalestate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_reborn:
statemap |= sd_rebornstate;
break;
case sd_up:
statemap |= sd_upstate;
break;
case sd_initializing:
statemap |= sd_initstate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_initialized:
statemap |= sd_initializedstate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_unallocated:
case sd_uninit:
case sd_reviving:
case sd_referenced:
statemap |= sd_otherstate;
(plex->sddowncount)++; /* another unusable subdisk */
}
}
return statemap;
}
/* determine the state of the volume relative to this plex */
enum volplexstate
vpstate(struct plex *plex)
{
struct volume *vol;
enum volplexstate state = volplex_onlyusdown; /* state to return */
int plexno;
if (plex->volno < 0) { /* not associated with a volume */
if (plex->state > plex_degraded)
return volplex_onlyus; /* just us */
else
return volplex_onlyusdown; /* assume the worst */
}
vol = &VOL[plex->volno]; /* point to our volume */
for (plexno = 0; plexno < vol->plexes; plexno++) {
if (&PLEX[vol->plex[plexno]] == plex) { /* us */
if (PLEX[vol->plex[plexno]].state >= plex_degraded) /* are we up? */
state |= volplex_onlyus; /* yes */
} else {
if (PLEX[vol->plex[plexno]].state >= plex_degraded) /* not us */
state |= volplex_otherup; /* and when they were up, they were up */
else
state |= volplex_alldown; /* and when they were down, they were down */
}
}
return state; /* and when they were only halfway up */
} /* they were neither up nor down */
/* Check if all bits b are set in a */
int allset(int a, int b);
int
allset(int a, int b)
{
return (a & b) == b;
}
/* Invalidate the subdisks belonging to a plex */
void
invalidate_subdisks(struct plex *plex, enum sdstate state)
{
int sdno;
for (sdno = 0; sdno < plex->subdisks; sdno++) { /* for each subdisk */
struct sd *sd = &SD[plex->sdnos[sdno]];
switch (sd->state) {
case sd_unallocated:
case sd_uninit:
case sd_init:
case sd_initializing:
case sd_initialized:
case sd_empty:
case sd_obsolete:
case sd_stale:
case sd_crashed:
case sd_down:
case sd_referenced:
break;
case sd_reviving:
case sd_reborn:
case sd_up:
set_sd_state(plex->sdnos[sdno], state, setstate_force);
}
}
}
/*
* Start an object, in other words do what we can to get it up.
* This is called from vinumioctl (VINUMSTART).
* Return error indications via ioctl_reply
*/
void
start_object(struct vinum_ioctl_msg *data)
{
int status;
int objindex = data->index; /* data gets overwritten */
struct _ioctl_reply *ioctl_reply = (struct _ioctl_reply *) data; /* format for returning replies */
enum setstateflags flags;
if (data->force != 0) /* are we going to use force? */
flags = setstate_force; /* yes */
else
flags = setstate_none; /* no */
switch (data->type) {
case drive_object:
status = set_drive_state(objindex, drive_up, flags);
if (DRIVE[objindex].state != drive_up) /* set status on whether we really did it */
ioctl_reply->error = EBUSY;
else
ioctl_reply->error = 0;
break;
case sd_object:
if (DRIVE[SD[objindex].driveno].state != drive_up) {
ioctl_reply->error = EIO;
strcpy(ioctl_reply->msg, "Drive is down");
return;
}
if ((SD[objindex].state == sd_reviving) /* reviving, */
||(SD[objindex].state == sd_stale)) { /* or stale, will revive */
SD[objindex].state = sd_reviving; /* make sure we're reviving */
if (data->blocksize)
SD[objindex].revive_blocksize = data->blocksize;
ioctl_reply->error = revive_block(objindex); /* revive another block */
ioctl_reply->msg[0] = '\0'; /* no comment */
return;
} else if (SD[objindex].state == sd_initializing) { /* initializing, */
if (data->blocksize)
SD[objindex].init_blocksize = data->blocksize;
ioctl_reply->error = initsd(objindex, data->verify); /* initialize another block */
ioctl_reply->msg[0] = '\0'; /* no comment */
return;
}
status = set_sd_state(objindex, sd_up, flags); /* set state */
if (status != EAGAIN) { /* not first revive or initialize, */
if (SD[objindex].state != sd_up) /* set status on whether we really did it */
ioctl_reply->error = EBUSY;
else
ioctl_reply->error = 0;
} else
ioctl_reply->error = status;
break;
case plex_object:
status = set_plex_state(objindex, plex_up, flags);
if (PLEX[objindex].state != plex_up) /* set status on whether we really did it */
ioctl_reply->error = EBUSY;
else
ioctl_reply->error = 0;
break;
case volume_object:
status = set_volume_state(objindex, volume_up, flags);
if (VOL[objindex].state != volume_up) /* set status on whether we really did it */
ioctl_reply->error = EBUSY;
else
ioctl_reply->error = 0;
break;
default:
ioctl_reply->error = EINVAL;
strcpy(ioctl_reply->msg, "Invalid object type");
return;
}
/*
* There's no point in saying anything here:
* the userland program does it better
*/
ioctl_reply->msg[0] = '\0';
}
/*
* Stop an object, in other words do what we can to get it down
* This is called from vinumioctl (VINUMSTOP).
* Return error indications via ioctl_reply.
*/
void
stop_object(struct vinum_ioctl_msg *data)
{
int status = 1;
int objindex = data->index; /* save the number from change */
struct _ioctl_reply *ioctl_reply = (struct _ioctl_reply *) data; /* format for returning replies */
switch (data->type) {
case drive_object:
status = set_drive_state(objindex, drive_down, data->force);
break;
case sd_object:
status = set_sd_state(objindex, sd_down, data->force);
break;
case plex_object:
status = set_plex_state(objindex, plex_down, data->force);
break;
case volume_object:
status = set_volume_state(objindex, volume_down, data->force);
break;
default:
ioctl_reply->error = EINVAL;
strcpy(ioctl_reply->msg, "Invalid object type");
return;
}
ioctl_reply->msg[0] = '\0';
if (status == 0) /* couldn't do it */
ioctl_reply->error = EBUSY;
else
ioctl_reply->error = 0;
}
/*
* VINUM_SETSTATE ioctl: set an object state.
* msg is the message passed by the user.
*/
void
setstate(struct vinum_ioctl_msg *msg)
{
int sdno;
struct sd *sd;
struct plex *plex;
struct _ioctl_reply *ioctl_reply = (struct _ioctl_reply *) msg; /* format for returning replies */
switch (msg->state) {
case object_down:
stop_object(msg);
break;
case object_initializing:
switch (msg->type) {
case sd_object:
sd = &SD[msg->index];
if ((msg->index >= vinum_conf.subdisks_allocated)
|| (sd->state <= sd_referenced)) {
sprintf(ioctl_reply->msg, "Invalid subdisk %d", msg->index);
ioctl_reply->error = EFAULT;
return;
}
set_sd_state(msg->index, sd_initializing, msg->force);
if (sd->state != sd_initializing) {
strcpy(ioctl_reply->msg, "Can't set state");
ioctl_reply->error = EBUSY;
} else
ioctl_reply->error = 0;
break;
case plex_object:
plex = &PLEX[msg->index];
if ((msg->index >= vinum_conf.plexes_allocated)
|| (plex->state <= plex_unallocated)) {
sprintf(ioctl_reply->msg, "Invalid plex %d", msg->index);
ioctl_reply->error = EFAULT;
return;
}
set_plex_state(msg->index, plex_initializing, msg->force);
if (plex->state != plex_initializing) {
strcpy(ioctl_reply->msg, "Can't set state");
ioctl_reply->error = EBUSY;
} else {
ioctl_reply->error = 0;
for (sdno = 0; sdno < plex->subdisks; sdno++) {
sd = &SD[plex->sdnos[sdno]];
set_sd_state(plex->sdnos[sdno], sd_initializing, msg->force);
if (sd->state != sd_initializing) {
strcpy(ioctl_reply->msg, "Can't set state");
ioctl_reply->error = EBUSY;
break;
}
}
}
break;
default:
strcpy(ioctl_reply->msg, "Invalid object");
ioctl_reply->error = EINVAL;
}
break;
case object_initialized:
if (msg->type == sd_object) {
sd = &SD[msg->index];
if ((msg->index >= vinum_conf.subdisks_allocated)
|| (sd->state <= sd_referenced)) {
sprintf(ioctl_reply->msg, "Invalid subdisk %d", msg->index);
ioctl_reply->error = EFAULT;
return;
}
set_sd_state(msg->index, sd_initialized, msg->force);
if (sd->state != sd_initializing) {
strcpy(ioctl_reply->msg, "Can't set state");
ioctl_reply->error = EBUSY;
} else
ioctl_reply->error = 0;
} else {
strcpy(ioctl_reply->msg, "Invalid object");
ioctl_reply->error = EINVAL;
}
break;
case object_up:
start_object(msg);
}
}
/*
* Brute force set state function. Don't look at
* any dependencies, just do it. This is mainly
* intended for testing and recovery.
*/
void
setstate_by_force(struct vinum_ioctl_msg *msg)
{
struct _ioctl_reply *ioctl_reply = (struct _ioctl_reply *) msg; /* format for returning replies */
switch (msg->type) {
case drive_object:
DRIVE[msg->index].state = msg->state;
break;
case sd_object:
SD[msg->index].state = msg->state;
break;
case plex_object:
PLEX[msg->index].state = msg->state;
break;
case volume_object:
VOL[msg->index].state = msg->state;
break;
default:
}
ioctl_reply->error = 0;
}
/* Local Variables: */
/* fill-column: 50 */
/* End: */
|