summaryrefslogtreecommitdiffstats
path: root/fs/ceph/osdmap.c
blob: 1d5f58cc2d9337e18a278828a6a4654b55e898ae (plain)
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

#include "ceph_debug.h"

#include <linux/slab.h>
#include <asm/div64.h>

#include "super.h"
#include "osdmap.h"
#include "crush/hash.h"
#include "crush/mapper.h"
#include "decode.h"

char *ceph_osdmap_state_str(char *str, int len, int state)
{
	int flag = 0;

	if (!len)
		goto done;

	*str = '\0';
	if (state) {
		if (state & CEPH_OSD_EXISTS) {
			snprintf(str, len, "exists");
			flag = 1;
		}
		if (state & CEPH_OSD_UP) {
			snprintf(str, len, "%s%s%s", str, (flag ? ", " : ""),
				 "up");
			flag = 1;
		}
	} else {
		snprintf(str, len, "doesn't exist");
	}
done:
	return str;
}

/* maps */

static int calc_bits_of(unsigned t)
{
	int b = 0;
	while (t) {
		t = t >> 1;
		b++;
	}
	return b;
}

/*
 * the foo_mask is the smallest value 2^n-1 that is >= foo.
 */
static void calc_pg_masks(struct ceph_pg_pool_info *pi)
{
	pi->pg_num_mask = (1 << calc_bits_of(le32_to_cpu(pi->v.pg_num)-1)) - 1;
	pi->pgp_num_mask =
		(1 << calc_bits_of(le32_to_cpu(pi->v.pgp_num)-1)) - 1;
	pi->lpg_num_mask =
		(1 << calc_bits_of(le32_to_cpu(pi->v.lpg_num)-1)) - 1;
	pi->lpgp_num_mask =
		(1 << calc_bits_of(le32_to_cpu(pi->v.lpgp_num)-1)) - 1;
}

/*
 * decode crush map
 */
static int crush_decode_uniform_bucket(void **p, void *end,
				       struct crush_bucket_uniform *b)
{
	dout("crush_decode_uniform_bucket %p to %p\n", *p, end);
	ceph_decode_need(p, end, (1+b->h.size) * sizeof(u32), bad);
	b->item_weight = ceph_decode_32(p);
	return 0;
bad:
	return -EINVAL;
}

static int crush_decode_list_bucket(void **p, void *end,
				    struct crush_bucket_list *b)
{
	int j;
	dout("crush_decode_list_bucket %p to %p\n", *p, end);
	b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
	if (b->item_weights == NULL)
		return -ENOMEM;
	b->sum_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
	if (b->sum_weights == NULL)
		return -ENOMEM;
	ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
	for (j = 0; j < b->h.size; j++) {
		b->item_weights[j] = ceph_decode_32(p);
		b->sum_weights[j] = ceph_decode_32(p);
	}
	return 0;
bad:
	return -EINVAL;
}

static int crush_decode_tree_bucket(void **p, void *end,
				    struct crush_bucket_tree *b)
{
	int j;
	dout("crush_decode_tree_bucket %p to %p\n", *p, end);
	ceph_decode_32_safe(p, end, b->num_nodes, bad);
	b->node_weights = kcalloc(b->num_nodes, sizeof(u32), GFP_NOFS);
	if (b->node_weights == NULL)
		return -ENOMEM;
	ceph_decode_need(p, end, b->num_nodes * sizeof(u32), bad);
	for (j = 0; j < b->num_nodes; j++)
		b->node_weights[j] = ceph_decode_32(p);
	return 0;
bad:
	return -EINVAL;
}

static int crush_decode_straw_bucket(void **p, void *end,
				     struct crush_bucket_straw *b)
{
	int j;
	dout("crush_decode_straw_bucket %p to %p\n", *p, end);
	b->item_weights = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
	if (b->item_weights == NULL)
		return -ENOMEM;
	b->straws = kcalloc(b->h.size, sizeof(u32), GFP_NOFS);
	if (b->straws == NULL)
		return -ENOMEM;
	ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
	for (j = 0; j < b->h.size; j++) {
		b->item_weights[j] = ceph_decode_32(p);
		b->straws[j] = ceph_decode_32(p);
	}
	return 0;
bad:
	return -EINVAL;
}

static struct crush_map *crush_decode(void *pbyval, void *end)
{
	struct crush_map *c;
	int err = -EINVAL;
	int i, j;
	void **p = &pbyval;
	void *start = pbyval;
	u32 magic;

	dout("crush_decode %p to %p len %d\n", *p, end, (int)(end - *p));

	c = kzalloc(sizeof(*c), GFP_NOFS);
	if (c == NULL)
		return ERR_PTR(-ENOMEM);

	ceph_decode_need(p, end, 4*sizeof(u32), bad);
	magic = ceph_decode_32(p);
	if (magic != CRUSH_MAGIC) {
		pr_err("crush_decode magic %x != current %x\n",
		       (unsigned)magic, (unsigned)CRUSH_MAGIC);
		goto bad;
	}
	c->max_buckets = ceph_decode_32(p);
	c->max_rules = ceph_decode_32(p);
	c->max_devices = ceph_decode_32(p);

	c->device_parents = kcalloc(c->max_devices, sizeof(u32), GFP_NOFS);
	if (c->device_parents == NULL)
		goto badmem;
	c->bucket_parents = kcalloc(c->max_buckets, sizeof(u32), GFP_NOFS);
	if (c->bucket_parents == NULL)
		goto badmem;

	c->buckets = kcalloc(c->max_buckets, sizeof(*c->buckets), GFP_NOFS);
	if (c->buckets == NULL)
		goto badmem;
	c->rules = kcalloc(c->max_rules, sizeof(*c->rules), GFP_NOFS);
	if (c->rules == NULL)
		goto badmem;

	/* buckets */
	for (i = 0; i < c->max_buckets; i++) {
		int size = 0;
		u32 alg;
		struct crush_bucket *b;

		ceph_decode_32_safe(p, end, alg, bad);
		if (alg == 0) {
			c->buckets[i] = NULL;
			continue;
		}
		dout("crush_decode bucket %d off %x %p to %p\n",
		     i, (int)(*p-start), *p, end);

		switch (alg) {
		case CRUSH_BUCKET_UNIFORM:
			size = sizeof(struct crush_bucket_uniform);
			break;
		case CRUSH_BUCKET_LIST:
			size = sizeof(struct crush_bucket_list);
			break;
		case CRUSH_BUCKET_TREE:
			size = sizeof(struct crush_bucket_tree);
			break;
		case CRUSH_BUCKET_STRAW:
			size = sizeof(struct crush_bucket_straw);
			break;
		default:
			err = -EINVAL;
			goto bad;
		}
		BUG_ON(size == 0);
		b = c->buckets[i] = kzalloc(size, GFP_NOFS);
		if (b == NULL)
			goto badmem;

		ceph_decode_need(p, end, 4*sizeof(u32), bad);
		b->id = ceph_decode_32(p);
		b->type = ceph_decode_16(p);
		b->alg = ceph_decode_8(p);
		b->hash = ceph_decode_8(p);
		b->weight = ceph_decode_32(p);
		b->size = ceph_decode_32(p);

		dout("crush_decode bucket size %d off %x %p to %p\n",
		     b->size, (int)(*p-start), *p, end);

		b->items = kcalloc(b->size, sizeof(__s32), GFP_NOFS);
		if (b->items == NULL)
			goto badmem;
		b->perm = kcalloc(b->size, sizeof(u32), GFP_NOFS);
		if (b->perm == NULL)
			goto badmem;
		b->perm_n = 0;

		ceph_decode_need(p, end, b->size*sizeof(u32), bad);
		for (j = 0; j < b->size; j++)
			b->items[j] = ceph_decode_32(p);

		switch (b->alg) {
		case CRUSH_BUCKET_UNIFORM:
			err = crush_decode_uniform_bucket(p, end,
				  (struct crush_bucket_uniform *)b);
			if (err < 0)
				goto bad;
			break;
		case CRUSH_BUCKET_LIST:
			err = crush_decode_list_bucket(p, end,
			       (struct crush_bucket_list *)b);
			if (err < 0)
				goto bad;
			break;
		case CRUSH_BUCKET_TREE:
			err = crush_decode_tree_bucket(p, end,
				(struct crush_bucket_tree *)b);
			if (err < 0)
				goto bad;
			break;
		case CRUSH_BUCKET_STRAW:
			err = crush_decode_straw_bucket(p, end,
				(struct crush_bucket_straw *)b);
			if (err < 0)
				goto bad;
			break;
		}
	}

	/* rules */
	dout("rule vec is %p\n", c->rules);
	for (i = 0; i < c->max_rules; i++) {
		u32 yes;
		struct crush_rule *r;

		ceph_decode_32_safe(p, end, yes, bad);
		if (!yes) {
			dout("crush_decode NO rule %d off %x %p to %p\n",
			     i, (int)(*p-start), *p, end);
			c->rules[i] = NULL;
			continue;
		}

		dout("crush_decode rule %d off %x %p to %p\n",
		     i, (int)(*p-start), *p, end);

		/* len */
		ceph_decode_32_safe(p, end, yes, bad);
#if BITS_PER_LONG == 32
		err = -EINVAL;
		if (yes > ULONG_MAX / sizeof(struct crush_rule_step))
			goto bad;
#endif
		r = c->rules[i] = kmalloc(sizeof(*r) +
					  yes*sizeof(struct crush_rule_step),
					  GFP_NOFS);
		if (r == NULL)
			goto badmem;
		dout(" rule %d is at %p\n", i, r);
		r->len = yes;
		ceph_decode_copy_safe(p, end, &r->mask, 4, bad); /* 4 u8's */
		ceph_decode_need(p, end, r->len*3*sizeof(u32), bad);
		for (j = 0; j < r->len; j++) {
			r->steps[j].op = ceph_decode_32(p);
			r->steps[j].arg1 = ceph_decode_32(p);
			r->steps[j].arg2 = ceph_decode_32(p);
		}
	}

	/* ignore trailing name maps. */

	dout("crush_decode success\n");
	return c;

badmem:
	err = -ENOMEM;
bad:
	dout("crush_decode fail %d\n", err);
	crush_destroy(c);
	return ERR_PTR(err);
}

/*
 * rbtree of pg_mapping for handling pg_temp (explicit mapping of pgid
 * to a set of osds)
 */
static int pgid_cmp(struct ceph_pg l, struct ceph_pg r)
{
	u64 a = *(u64 *)&l;
	u64 b = *(u64 *)&r;

	if (a < b)
		return -1;
	if (a > b)
		return 1;
	return 0;
}

static int __insert_pg_mapping(struct ceph_pg_mapping *new,
			       struct rb_root *root)
{
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent = NULL;
	struct ceph_pg_mapping *pg = NULL;
	int c;

	while (*p) {
		parent = *p;
		pg = rb_entry(parent, struct ceph_pg_mapping, node);
		c = pgid_cmp(new->pgid, pg->pgid);
		if (c < 0)
			p = &(*p)->rb_left;
		else if (c > 0)
			p = &(*p)->rb_right;
		else
			return -EEXIST;
	}

	rb_link_node(&new->node, parent, p);
	rb_insert_color(&new->node, root);
	return 0;
}

static struct ceph_pg_mapping *__lookup_pg_mapping(struct rb_root *root,
						   struct ceph_pg pgid)
{
	struct rb_node *n = root->rb_node;
	struct ceph_pg_mapping *pg;
	int c;

	while (n) {
		pg = rb_entry(n, struct ceph_pg_mapping, node);
		c = pgid_cmp(pgid, pg->pgid);
		if (c < 0)
			n = n->rb_left;
		else if (c > 0)
			n = n->rb_right;
		else
			return pg;
	}
	return NULL;
}

/*
 * rbtree of pg pool info
 */
static int __insert_pg_pool(struct rb_root *root, struct ceph_pg_pool_info *new)
{
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent = NULL;
	struct ceph_pg_pool_info *pi = NULL;

	while (*p) {
		parent = *p;
		pi = rb_entry(parent, struct ceph_pg_pool_info, node);
		if (new->id < pi->id)
			p = &(*p)->rb_left;
		else if (new->id > pi->id)
			p = &(*p)->rb_right;
		else
			return -EEXIST;
	}

	rb_link_node(&new->node, parent, p);
	rb_insert_color(&new->node, root);
	return 0;
}

static struct ceph_pg_pool_info *__lookup_pg_pool(struct rb_root *root, int id)
{
	struct ceph_pg_pool_info *pi;
	struct rb_node *n = root->rb_node;

	while (n) {
		pi = rb_entry(n, struct ceph_pg_pool_info, node);
		if (id < pi->id)
			n = n->rb_left;
		else if (id > pi->id)
			n = n->rb_right;
		else
			return pi;
	}
	return NULL;
}

static void __remove_pg_pool(struct rb_root *root, struct ceph_pg_pool_info *pi)
{
	rb_erase(&pi->node, root);
	kfree(pi->name);
	kfree(pi);
}

static void __decode_pool(void **p, struct ceph_pg_pool_info *pi)
{
	ceph_decode_copy(p, &pi->v, sizeof(pi->v));
	calc_pg_masks(pi);
	*p += le32_to_cpu(pi->v.num_snaps) * sizeof(u64);
	*p += le32_to_cpu(pi->v.num_removed_snap_intervals) * sizeof(u64) * 2;
}

static int __decode_pool_names(void **p, void *end, struct ceph_osdmap *map)
{
	struct ceph_pg_pool_info *pi;
	u32 num, len, pool;

	ceph_decode_32_safe(p, end, num, bad);
	dout(" %d pool names\n", num);
	while (num--) {
		ceph_decode_32_safe(p, end, pool, bad);
		ceph_decode_32_safe(p, end, len, bad);
		dout("  pool %d len %d\n", pool, len);
		pi = __lookup_pg_pool(&map->pg_pools, pool);
		if (pi) {
			kfree(pi->name);
			pi->name = kmalloc(len + 1, GFP_NOFS);
			if (pi->name) {
				memcpy(pi->name, *p, len);
				pi->name[len] = '\0';
				dout("  name is %s\n", pi->name);
			}
		}
		*p += len;
	}
	return 0;

bad:
	return -EINVAL;
}

/*
 * osd map
 */
void ceph_osdmap_destroy(struct ceph_osdmap *map)
{
	dout("osdmap_destroy %p\n", map);
	if (map->crush)
		crush_destroy(map->crush);
	while (!RB_EMPTY_ROOT(&map->pg_temp)) {
		struct ceph_pg_mapping *pg =
			rb_entry(rb_first(&map->pg_temp),
				 struct ceph_pg_mapping, node);
		rb_erase(&pg->node, &map->pg_temp);
		kfree(pg);
	}
	while (!RB_EMPTY_ROOT(&map->pg_pools)) {
		struct ceph_pg_pool_info *pi =
			rb_entry(rb_first(&map->pg_pools),
				 struct ceph_pg_pool_info, node);
		__remove_pg_pool(&map->pg_pools, pi);
	}
	kfree(map->osd_state);
	kfree(map->osd_weight);
	kfree(map->osd_addr);
	kfree(map);
}

/*
 * adjust max osd value.  reallocate arrays.
 */
static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
{
	u8 *state;
	struct ceph_entity_addr *addr;
	u32 *weight;

	state = kcalloc(max, sizeof(*state), GFP_NOFS);
	addr = kcalloc(max, sizeof(*addr), GFP_NOFS);
	weight = kcalloc(max, sizeof(*weight), GFP_NOFS);
	if (state == NULL || addr == NULL || weight == NULL) {
		kfree(state);
		kfree(addr);
		kfree(weight);
		return -ENOMEM;
	}

	/* copy old? */
	if (map->osd_state) {
		memcpy(state, map->osd_state, map->max_osd*sizeof(*state));
		memcpy(addr, map->osd_addr, map->max_osd*sizeof(*addr));
		memcpy(weight, map->osd_weight, map->max_osd*sizeof(*weight));
		kfree(map->osd_state);
		kfree(map->osd_addr);
		kfree(map->osd_weight);
	}

	map->osd_state = state;
	map->osd_weight = weight;
	map->osd_addr = addr;
	map->max_osd = max;
	return 0;
}

/*
 * decode a full map.
 */
struct ceph_osdmap *osdmap_decode(void **p, void *end)
{
	struct ceph_osdmap *map;
	u16 version;
	u32 len, max, i;
	u8 ev;
	int err = -EINVAL;
	void *start = *p;
	struct ceph_pg_pool_info *pi;

	dout("osdmap_decode %p to %p len %d\n", *p, end, (int)(end - *p));

	map = kzalloc(sizeof(*map), GFP_NOFS);
	if (map == NULL)
		return ERR_PTR(-ENOMEM);
	map->pg_temp = RB_ROOT;

	ceph_decode_16_safe(p, end, version, bad);
	if (version > CEPH_OSDMAP_VERSION) {
		pr_warning("got unknown v %d > %d of osdmap\n", version,
			   CEPH_OSDMAP_VERSION);
		goto bad;
	}

	ceph_decode_need(p, end, 2*sizeof(u64)+6*sizeof(u32), bad);
	ceph_decode_copy(p, &map->fsid, sizeof(map->fsid));
	map->epoch = ceph_decode_32(p);
	ceph_decode_copy(p, &map->created, sizeof(map->created));
	ceph_decode_copy(p, &map->modified, sizeof(map->modified));

	ceph_decode_32_safe(p, end, max, bad);
	while (max--) {
		ceph_decode_need(p, end, 4 + 1 + sizeof(pi->v), bad);
		pi = kzalloc(sizeof(*pi), GFP_NOFS);
		if (!pi)
			goto bad;
		pi->id = ceph_decode_32(p);
		ev = ceph_decode_8(p); /* encoding version */
		if (ev > CEPH_PG_POOL_VERSION) {
			pr_warning("got unknown v %d > %d of ceph_pg_pool\n",
				   ev, CEPH_PG_POOL_VERSION);
			kfree(pi);
			goto bad;
		}
		__decode_pool(p, pi);
		__insert_pg_pool(&map->pg_pools, pi);
	}

	if (version >= 5 && __decode_pool_names(p, end, map) < 0)
		goto bad;

	ceph_decode_32_safe(p, end, map->pool_max, bad);

	ceph_decode_32_safe(p, end, map->flags, bad);

	max = ceph_decode_32(p);

	/* (re)alloc osd arrays */
	err = osdmap_set_max_osd(map, max);
	if (err < 0)
		goto bad;
	dout("osdmap_decode max_osd = %d\n", map->max_osd);

	/* osds */
	err = -EINVAL;
	ceph_decode_need(p, end, 3*sizeof(u32) +
			 map->max_osd*(1 + sizeof(*map->osd_weight) +
				       sizeof(*map->osd_addr)), bad);
	*p += 4; /* skip length field (should match max) */
	ceph_decode_copy(p, map->osd_state, map->max_osd);

	*p += 4; /* skip length field (should match max) */
	for (i = 0; i < map->max_osd; i++)
		map->osd_weight[i] = ceph_decode_32(p);

	*p += 4; /* skip length field (should match max) */
	ceph_decode_copy(p, map->osd_addr, map->max_osd*sizeof(*map->osd_addr));
	for (i = 0; i < map->max_osd; i++)
		ceph_decode_addr(&map->osd_addr[i]);

	/* pg_temp */
	ceph_decode_32_safe(p, end, len, bad);
	for (i = 0; i < len; i++) {
		int n, j;
		struct ceph_pg pgid;
		struct ceph_pg_mapping *pg;

		ceph_decode_need(p, end, sizeof(u32) + sizeof(u64), bad);
		ceph_decode_copy(p, &pgid, sizeof(pgid));
		n = ceph_decode_32(p);
		ceph_decode_need(p, end, n * sizeof(u32), bad);
		err = -ENOMEM;
		pg = kmalloc(sizeof(*pg) + n*sizeof(u32), GFP_NOFS);
		if (!pg)
			goto bad;
		pg->pgid = pgid;
		pg->len = n;
		for (j = 0; j < n; j++)
			pg->osds[j] = ceph_decode_32(p);

		err = __insert_pg_mapping(pg, &map->pg_temp);
		if (err)
			goto bad;
		dout(" added pg_temp %llx len %d\n", *(u64 *)&pgid, len);
	}

	/* crush */
	ceph_decode_32_safe(p, end, len, bad);
	dout("osdmap_decode crush len %d from off 0x%x\n", len,
	     (int)(*p - start));
	ceph_decode_need(p, end, len, bad);
	map->crush = crush_decode(*p, end);
	*p += len;
	if (IS_ERR(map->crush)) {
		err = PTR_ERR(map->crush);
		map->crush = NULL;
		goto bad;
	}

	/* ignore the rest of the map */
	*p = end;

	dout("osdmap_decode done %p %p\n", *p, end);
	return map;

bad:
	dout("osdmap_decode fail\n");
	ceph_osdmap_destroy(map);
	return ERR_PTR(err);
}

/*
 * decode and apply an incremental map update.
 */
struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
					     struct ceph_osdmap *map,
					     struct ceph_messenger *msgr)
{
	struct crush_map *newcrush = NULL;
	struct ceph_fsid fsid;
	u32 epoch = 0;
	struct ceph_timespec modified;
	u32 len, pool;
	__s32 new_pool_max, new_flags, max;
	void *start = *p;
	int err = -EINVAL;
	u16 version;
	struct rb_node *rbp;

	ceph_decode_16_safe(p, end, version, bad);
	if (version > CEPH_OSDMAP_INC_VERSION) {
		pr_warning("got unknown v %d > %d of inc osdmap\n", version,
			   CEPH_OSDMAP_INC_VERSION);
		goto bad;
	}

	ceph_decode_need(p, end, sizeof(fsid)+sizeof(modified)+2*sizeof(u32),
			 bad);
	ceph_decode_copy(p, &fsid, sizeof(fsid));
	epoch = ceph_decode_32(p);
	BUG_ON(epoch != map->epoch+1);
	ceph_decode_copy(p, &modified, sizeof(modified));
	new_pool_max = ceph_decode_32(p);
	new_flags = ceph_decode_32(p);

	/* full map? */
	ceph_decode_32_safe(p, end, len, bad);
	if (len > 0) {
		dout("apply_incremental full map len %d, %p to %p\n",
		     len, *p, end);
		return osdmap_decode(p, min(*p+len, end));
	}

	/* new crush? */
	ceph_decode_32_safe(p, end, len, bad);
	if (len > 0) {
		dout("apply_incremental new crush map len %d, %p to %p\n",
		     len, *p, end);
		newcrush = crush_decode(*p, min(*p+len, end));
		if (IS_ERR(newcrush))
			return ERR_CAST(newcrush);
		*p += len;
	}

	/* new flags? */
	if (new_flags >= 0)
		map->flags = new_flags;
	if (new_pool_max >= 0)
		map->pool_max = new_pool_max;

	ceph_decode_need(p, end, 5*sizeof(u32), bad);

	/* new max? */
	max = ceph_decode_32(p);
	if (max >= 0) {
		err = osdmap_set_max_osd(map, max);
		if (err < 0)
			goto bad;
	}

	map->epoch++;
	map->modified = map->modified;
	if (newcrush) {
		if (map->crush)
			crush_destroy(map->crush);
		map->crush = newcrush;
		newcrush = NULL;
	}

	/* new_pool */
	ceph_decode_32_safe(p, end, len, bad);
	while (len--) {
		__u8 ev;
		struct ceph_pg_pool_info *pi;

		ceph_decode_32_safe(p, end, pool, bad);
		ceph_decode_need(p, end, 1 + sizeof(pi->v), bad);
		ev = ceph_decode_8(p);  /* encoding version */
		if (ev > CEPH_PG_POOL_VERSION) {
			pr_warning("got unknown v %d > %d of ceph_pg_pool\n",
				   ev, CEPH_PG_POOL_VERSION);
			goto bad;
		}
		pi = __lookup_pg_pool(&map->pg_pools, pool);
		if (!pi) {
			pi = kzalloc(sizeof(*pi), GFP_NOFS);
			if (!pi) {
				err = -ENOMEM;
				goto bad;
			}
			pi->id = pool;
			__insert_pg_pool(&map->pg_pools, pi);
		}
		__decode_pool(p, pi);
	}
	if (version >= 5 && __decode_pool_names(p, end, map) < 0)
		goto bad;

	/* old_pool */
	ceph_decode_32_safe(p, end, len, bad);
	while (len--) {
		struct ceph_pg_pool_info *pi;

		ceph_decode_32_safe(p, end, pool, bad);
		pi = __lookup_pg_pool(&map->pg_pools, pool);
		if (pi)
			__remove_pg_pool(&map->pg_pools, pi);
	}

	/* new_up */
	err = -EINVAL;
	ceph_decode_32_safe(p, end, len, bad);
	while (len--) {
		u32 osd;
		struct ceph_entity_addr addr;
		ceph_decode_32_safe(p, end, osd, bad);
		ceph_decode_copy_safe(p, end, &addr, sizeof(addr), bad);
		ceph_decode_addr(&addr);
		pr_info("osd%d up\n", osd);
		BUG_ON(osd >= map->max_osd);
		map->osd_state[osd] |= CEPH_OSD_UP;
		map->osd_addr[osd] = addr;
	}

	/* new_down */
	ceph_decode_32_safe(p, end, len, bad);
	while (len--) {
		u32 osd;
		ceph_decode_32_safe(p, end, osd, bad);
		(*p)++;  /* clean flag */
		pr_info("osd%d down\n", osd);
		if (osd < map->max_osd)
			map->osd_state[osd] &= ~CEPH_OSD_UP;
	}

	/* new_weight */
	ceph_decode_32_safe(p, end, len, bad);
	while (len--) {
		u32 osd, off;
		ceph_decode_need(p, end, sizeof(u32)*2, bad);
		osd = ceph_decode_32(p);
		off = ceph_decode_32(p);
		pr_info("osd%d weight 0x%x %s\n", osd, off,
		     off == CEPH_OSD_IN ? "(in)" :
		     (off == CEPH_OSD_OUT ? "(out)" : ""));
		if (osd < map->max_osd)
			map->osd_weight[osd] = off;
	}

	/* new_pg_temp */
	rbp = rb_first(&map->pg_temp);
	ceph_decode_32_safe(p, end, len, bad);
	while (len--) {
		struct ceph_pg_mapping *pg;
		int j;
		struct ceph_pg pgid;
		u32 pglen;
		ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
		ceph_decode_copy(p, &pgid, sizeof(pgid));
		pglen = ceph_decode_32(p);

		/* remove any? */
		while (rbp && pgid_cmp(rb_entry(rbp, struct ceph_pg_mapping,
						node)->pgid, pgid) <= 0) {
			struct ceph_pg_mapping *cur =
				rb_entry(rbp, struct ceph_pg_mapping, node);
			
			rbp = rb_next(rbp);
			dout(" removed pg_temp %llx\n", *(u64 *)&cur->pgid);
			rb_erase(&cur->node, &map->pg_temp);
			kfree(cur);
		}

		if (pglen) {
			/* insert */
			ceph_decode_need(p, end, pglen*sizeof(u32), bad);
			pg = kmalloc(sizeof(*pg) + sizeof(u32)*pglen, GFP_NOFS);
			if (!pg) {
				err = -ENOMEM;
				goto bad;
			}
			pg->pgid = pgid;
			pg->len = pglen;
			for (j = 0; j < pglen; j++)
				pg->osds[j] = ceph_decode_32(p);
			err = __insert_pg_mapping(pg, &map->pg_temp);
			if (err) {
				kfree(pg);
				goto bad;
			}
			dout(" added pg_temp %llx len %d\n", *(u64 *)&pgid,
			     pglen);
		}
	}
	while (rbp) {
		struct ceph_pg_mapping *cur =
			rb_entry(rbp, struct ceph_pg_mapping, node);

		rbp = rb_next(rbp);
		dout(" removed pg_temp %llx\n", *(u64 *)&cur->pgid);
		rb_erase(&cur->node, &map->pg_temp);
		kfree(cur);
	}

	/* ignore the rest */
	*p = end;
	return map;

bad:
	pr_err("corrupt inc osdmap epoch %d off %d (%p of %p-%p)\n",
	       epoch, (int)(*p - start), *p, start, end);
	print_hex_dump(KERN_DEBUG, "osdmap: ",
		       DUMP_PREFIX_OFFSET, 16, 1,
		       start, end - start, true);
	if (newcrush)
		crush_destroy(newcrush);
	return ERR_PTR(err);
}




/*
 * calculate file layout from given offset, length.
 * fill in correct oid, logical length, and object extent
 * offset, length.
 *
 * for now, we write only a single su, until we can
 * pass a stride back to the caller.
 */
void ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
				   u64 off, u64 *plen,
				   u64 *ono,
				   u64 *oxoff, u64 *oxlen)
{
	u32 osize = le32_to_cpu(layout->fl_object_size);
	u32 su = le32_to_cpu(layout->fl_stripe_unit);
	u32 sc = le32_to_cpu(layout->fl_stripe_count);
	u32 bl, stripeno, stripepos, objsetno;
	u32 su_per_object;
	u64 t, su_offset;

	dout("mapping %llu~%llu  osize %u fl_su %u\n", off, *plen,
	     osize, su);
	su_per_object = osize / su;
	dout("osize %u / su %u = su_per_object %u\n", osize, su,
	     su_per_object);

	BUG_ON((su & ~PAGE_MASK) != 0);
	/* bl = *off / su; */
	t = off;
	do_div(t, su);
	bl = t;
	dout("off %llu / su %u = bl %u\n", off, su, bl);

	stripeno = bl / sc;
	stripepos = bl % sc;
	objsetno = stripeno / su_per_object;

	*ono = objsetno * sc + stripepos;
	dout("objset %u * sc %u = ono %u\n", objsetno, sc, (unsigned)*ono);

	/* *oxoff = *off % layout->fl_stripe_unit;  # offset in su */
	t = off;
	su_offset = do_div(t, su);
	*oxoff = su_offset + (stripeno % su_per_object) * su;

	/*
	 * Calculate the length of the extent being written to the selected
	 * object. This is the minimum of the full length requested (plen) or
	 * the remainder of the current stripe being written to.
	 */
	*oxlen = min_t(u64, *plen, su - su_offset);
	*plen = *oxlen;

	dout(" obj extent %llu~%llu\n", *oxoff, *oxlen);
}

/*
 * calculate an object layout (i.e. pgid) from an oid,
 * file_layout, and osdmap
 */
int ceph_calc_object_layout(struct ceph_object_layout *ol,
			    const char *oid,
			    struct ceph_file_layout *fl,
			    struct ceph_osdmap *osdmap)
{
	unsigned num, num_mask;
	struct ceph_pg pgid;
	s32 preferred = (s32)le32_to_cpu(fl->fl_pg_preferred);
	int poolid = le32_to_cpu(fl->fl_pg_pool);
	struct ceph_pg_pool_info *pool;
	unsigned ps;

	BUG_ON(!osdmap);

	pool = __lookup_pg_pool(&osdmap->pg_pools, poolid);
	if (!pool)
		return -EIO;
	ps = ceph_str_hash(pool->v.object_hash, oid, strlen(oid));
	if (preferred >= 0) {
		ps += preferred;
		num = le32_to_cpu(pool->v.lpg_num);
		num_mask = pool->lpg_num_mask;
	} else {
		num = le32_to_cpu(pool->v.pg_num);
		num_mask = pool->pg_num_mask;
	}

	pgid.ps = cpu_to_le16(ps);
	pgid.preferred = cpu_to_le16(preferred);
	pgid.pool = fl->fl_pg_pool;
	if (preferred >= 0)
		dout("calc_object_layout '%s' pgid %d.%xp%d\n", oid, poolid, ps,
		     (int)preferred);
	else
		dout("calc_object_layout '%s' pgid %d.%x\n", oid, poolid, ps);

	ol->ol_pgid = pgid;
	ol->ol_stripe_unit = fl->fl_object_stripe_unit;
	return 0;
}

/*
 * Calculate raw osd vector for the given pgid.  Return pointer to osd
 * array, or NULL on failure.
 */
static int *calc_pg_raw(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
			int *osds, int *num)
{
	struct ceph_pg_mapping *pg;
	struct ceph_pg_pool_info *pool;
	int ruleno;
	unsigned poolid, ps, pps;
	int preferred;

	/* pg_temp? */
	pg = __lookup_pg_mapping(&osdmap->pg_temp, pgid);
	if (pg) {
		*num = pg->len;
		return pg->osds;
	}

	/* crush */
	poolid = le32_to_cpu(pgid.pool);
	ps = le16_to_cpu(pgid.ps);
	preferred = (s16)le16_to_cpu(pgid.preferred);

	/* don't forcefeed bad device ids to crush */
	if (preferred >= osdmap->max_osd ||
	    preferred >= osdmap->crush->max_devices)
		preferred = -1;

	pool = __lookup_pg_pool(&osdmap->pg_pools, poolid);
	if (!pool)
		return NULL;
	ruleno = crush_find_rule(osdmap->crush, pool->v.crush_ruleset,
				 pool->v.type, pool->v.size);
	if (ruleno < 0) {
		pr_err("no crush rule pool %d ruleset %d type %d size %d\n",
		       poolid, pool->v.crush_ruleset, pool->v.type,
		       pool->v.size);
		return NULL;
	}

	if (preferred >= 0)
		pps = ceph_stable_mod(ps,
				      le32_to_cpu(pool->v.lpgp_num),
				      pool->lpgp_num_mask);
	else
		pps = ceph_stable_mod(ps,
				      le32_to_cpu(pool->v.pgp_num),
				      pool->pgp_num_mask);
	pps += poolid;
	*num = crush_do_rule(osdmap->crush, ruleno, pps, osds,
			     min_t(int, pool->v.size, *num),
			     preferred, osdmap->osd_weight);
	return osds;
}

/*
 * Return acting set for given pgid.
 */
int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
			int *acting)
{
	int rawosds[CEPH_PG_MAX_SIZE], *osds;
	int i, o, num = CEPH_PG_MAX_SIZE;

	osds = calc_pg_raw(osdmap, pgid, rawosds, &num);
	if (!osds)
		return -1;

	/* primary is first up osd */
	o = 0;
	for (i = 0; i < num; i++)
		if (ceph_osd_is_up(osdmap, osds[i]))
			acting[o++] = osds[i];
	return o;
}

/*
 * Return primary osd for given pgid, or -1 if none.
 */
int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, struct ceph_pg pgid)
{
	int rawosds[CEPH_PG_MAX_SIZE], *osds;
	int i, num = CEPH_PG_MAX_SIZE;

	osds = calc_pg_raw(osdmap, pgid, rawosds, &num);
	if (!osds)
		return -1;

	/* primary is first up osd */
	for (i = 0; i < num; i++)
		if (ceph_osd_is_up(osdmap, osds[i]))
			return osds[i];
	return -1;
}
OpenPOWER on IntegriCloud