summaryrefslogtreecommitdiffstats
path: root/include/sys/spa.h
blob: ea43713a44fa0381ed564c69ae13d22ba5d61e94 (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
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2011, 2014 by Delphix. All rights reserved.
 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
 */

#ifndef _SYS_SPA_H
#define	_SYS_SPA_H

#include <sys/avl.h>
#include <sys/zfs_context.h>
#include <sys/kstat.h>
#include <sys/nvpair.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/fs/zfs.h>

#ifdef	__cplusplus
extern "C" {
#endif

/*
 * Forward references that lots of things need.
 */
typedef struct spa spa_t;
typedef struct vdev vdev_t;
typedef struct metaslab metaslab_t;
typedef struct metaslab_group metaslab_group_t;
typedef struct metaslab_class metaslab_class_t;
typedef struct zio zio_t;
typedef struct zilog zilog_t;
typedef struct spa_aux_vdev spa_aux_vdev_t;
typedef struct ddt ddt_t;
typedef struct ddt_entry ddt_entry_t;
typedef struct zbookmark_phys zbookmark_phys_t;

struct dsl_pool;
struct dsl_dataset;

/*
 * General-purpose 32-bit and 64-bit bitfield encodings.
 */
#define	BF32_DECODE(x, low, len)	P2PHASE((x) >> (low), 1U << (len))
#define	BF64_DECODE(x, low, len)	P2PHASE((x) >> (low), 1ULL << (len))
#define	BF32_ENCODE(x, low, len)	(P2PHASE((x), 1U << (len)) << (low))
#define	BF64_ENCODE(x, low, len)	(P2PHASE((x), 1ULL << (len)) << (low))

#define	BF32_GET(x, low, len)		BF32_DECODE(x, low, len)
#define	BF64_GET(x, low, len)		BF64_DECODE(x, low, len)

#define	BF32_SET(x, low, len, val) do { \
	ASSERT3U(val, <, 1U << (len)); \
	ASSERT3U(low + len, <=, 32); \
	(x) ^= BF32_ENCODE((x >> low) ^ (val), low, len); \
_NOTE(CONSTCOND) } while (0)

#define	BF64_SET(x, low, len, val) do { \
	ASSERT3U(val, <, 1ULL << (len)); \
	ASSERT3U(low + len, <=, 64); \
	((x) ^= BF64_ENCODE((x >> low) ^ (val), low, len)); \
_NOTE(CONSTCOND) } while (0)

#define	BF32_GET_SB(x, low, len, shift, bias)	\
	((BF32_GET(x, low, len) + (bias)) << (shift))
#define	BF64_GET_SB(x, low, len, shift, bias)	\
	((BF64_GET(x, low, len) + (bias)) << (shift))

#define	BF32_SET_SB(x, low, len, shift, bias, val) do { \
	ASSERT(IS_P2ALIGNED(val, 1U << shift)); \
	ASSERT3S((val) >> (shift), >=, bias); \
	BF32_SET(x, low, len, ((val) >> (shift)) - (bias)); \
_NOTE(CONSTCOND) } while (0)
#define	BF64_SET_SB(x, low, len, shift, bias, val) do { \
	ASSERT(IS_P2ALIGNED(val, 1ULL << shift)); \
	ASSERT3S((val) >> (shift), >=, bias); \
	BF64_SET(x, low, len, ((val) >> (shift)) - (bias)); \
_NOTE(CONSTCOND) } while (0)

/*
 * We currently support nine block sizes, from 512 bytes to 128K.
 * We could go higher, but the benefits are near-zero and the cost
 * of COWing a giant block to modify one byte would become excessive.
 */
#define	SPA_MINBLOCKSHIFT	9
#define	SPA_MAXBLOCKSHIFT	17
#define	SPA_MINBLOCKSIZE	(1ULL << SPA_MINBLOCKSHIFT)
#define	SPA_MAXBLOCKSIZE	(1ULL << SPA_MAXBLOCKSHIFT)

#define	SPA_BLOCKSIZES		(SPA_MAXBLOCKSHIFT - SPA_MINBLOCKSHIFT + 1)

/*
 * Size of block to hold the configuration data (a packed nvlist)
 */
#define	SPA_CONFIG_BLOCKSIZE	(1ULL << 14)

/*
 * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
 * The ASIZE encoding should be at least 64 times larger (6 more bits)
 * to support up to 4-way RAID-Z mirror mode with worst-case gang block
 * overhead, three DVAs per bp, plus one more bit in case we do anything
 * else that expands the ASIZE.
 */
#define	SPA_LSIZEBITS		16	/* LSIZE up to 32M (2^16 * 512)	*/
#define	SPA_PSIZEBITS		16	/* PSIZE up to 32M (2^16 * 512)	*/
#define	SPA_ASIZEBITS		24	/* ASIZE up to 64 times larger	*/

/*
 * All SPA data is represented by 128-bit data virtual addresses (DVAs).
 * The members of the dva_t should be considered opaque outside the SPA.
 */
typedef struct dva {
	uint64_t	dva_word[2];
} dva_t;

/*
 * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
 */
typedef struct zio_cksum {
	uint64_t	zc_word[4];
} zio_cksum_t;

/*
 * Each block is described by its DVAs, time of birth, checksum, etc.
 * The word-by-word, bit-by-bit layout of the blkptr is as follows:
 *
 *	64	56	48	40	32	24	16	8	0
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 0	|		vdev1		| GRID  |	  ASIZE		|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 1	|G|			 offset1				|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 2	|		vdev2		| GRID  |	  ASIZE		|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 3	|G|			 offset2				|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 4	|		vdev3		| GRID  |	  ASIZE		|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 5	|G|			 offset3				|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 6	|BDX|lvl| type	| cksum |E| comp|    PSIZE	|     LSIZE	|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 7	|			padding					|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 8	|			padding					|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 9	|			physical birth txg			|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * a	|			logical birth txg			|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * b	|			fill count				|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * c	|			checksum[0]				|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * d	|			checksum[1]				|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * e	|			checksum[2]				|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * f	|			checksum[3]				|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * Legend:
 *
 * vdev		virtual device ID
 * offset	offset into virtual device
 * LSIZE	logical size
 * PSIZE	physical size (after compression)
 * ASIZE	allocated size (including RAID-Z parity and gang block headers)
 * GRID		RAID-Z layout information (reserved for future use)
 * cksum	checksum function
 * comp		compression function
 * G		gang block indicator
 * B		byteorder (endianness)
 * D		dedup
 * X		encryption (on version 30, which is not supported)
 * E		blkptr_t contains embedded data (see below)
 * lvl		level of indirection
 * type		DMU object type
 * phys birth	txg of block allocation; zero if same as logical birth txg
 * log. birth	transaction group in which the block was logically born
 * fill count	number of non-zero blocks under this bp
 * checksum[4]	256-bit checksum of the data this bp describes
 */

/*
 * "Embedded" blkptr_t's don't actually point to a block, instead they
 * have a data payload embedded in the blkptr_t itself.  See the comment
 * in blkptr.c for more details.
 *
 * The blkptr_t is laid out as follows:
 *
 *	64	56	48	40	32	24	16	8	0
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 0	|      payload                                                  |
 * 1	|      payload                                                  |
 * 2	|      payload                                                  |
 * 3	|      payload                                                  |
 * 4	|      payload                                                  |
 * 5	|      payload                                                  |
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 6	|BDX|lvl| type	| etype |E| comp| PSIZE|              LSIZE	|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * 7	|      payload                                                  |
 * 8	|      payload                                                  |
 * 9	|      payload                                                  |
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * a	|			logical birth txg			|
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 * b	|      payload                                                  |
 * c	|      payload                                                  |
 * d	|      payload                                                  |
 * e	|      payload                                                  |
 * f	|      payload                                                  |
 *	+-------+-------+-------+-------+-------+-------+-------+-------+
 *
 * Legend:
 *
 * payload		contains the embedded data
 * B (byteorder)	byteorder (endianness)
 * D (dedup)		padding (set to zero)
 * X			encryption (set to zero; see above)
 * E (embedded)		set to one
 * lvl			indirection level
 * type			DMU object type
 * etype		how to interpret embedded data (BP_EMBEDDED_TYPE_*)
 * comp			compression function of payload
 * PSIZE		size of payload after compression, in bytes
 * LSIZE		logical size of payload, in bytes
 *			note that 25 bits is enough to store the largest
 *			"normal" BP's LSIZE (2^16 * 2^9) in bytes
 * log. birth		transaction group in which the block was logically born
 *
 * Note that LSIZE and PSIZE are stored in bytes, whereas for non-embedded
 * bp's they are stored in units of SPA_MINBLOCKSHIFT.
 * Generally, the generic BP_GET_*() macros can be used on embedded BP's.
 * The B, D, X, lvl, type, and comp fields are stored the same as with normal
 * BP's so the BP_SET_* macros can be used with them.  etype, PSIZE, LSIZE must
 * be set with the BPE_SET_* macros.  BP_SET_EMBEDDED() should be called before
 * other macros, as they assert that they are only used on BP's of the correct
 * "embedded-ness".
 */

#define	BPE_GET_ETYPE(bp)	\
	(ASSERT(BP_IS_EMBEDDED(bp)), \
	BF64_GET((bp)->blk_prop, 40, 8))
#define	BPE_SET_ETYPE(bp, t)	do { \
	ASSERT(BP_IS_EMBEDDED(bp)); \
	BF64_SET((bp)->blk_prop, 40, 8, t); \
_NOTE(CONSTCOND) } while (0)

#define	BPE_GET_LSIZE(bp)	\
	(ASSERT(BP_IS_EMBEDDED(bp)), \
	BF64_GET_SB((bp)->blk_prop, 0, 25, 0, 1))
#define	BPE_SET_LSIZE(bp, x)	do { \
	ASSERT(BP_IS_EMBEDDED(bp)); \
	BF64_SET_SB((bp)->blk_prop, 0, 25, 0, 1, x); \
_NOTE(CONSTCOND) } while (0)

#define	BPE_GET_PSIZE(bp)	\
	(ASSERT(BP_IS_EMBEDDED(bp)), \
	BF64_GET_SB((bp)->blk_prop, 25, 7, 0, 1))
#define	BPE_SET_PSIZE(bp, x)	do { \
	ASSERT(BP_IS_EMBEDDED(bp)); \
	BF64_SET_SB((bp)->blk_prop, 25, 7, 0, 1, x); \
_NOTE(CONSTCOND) } while (0)

typedef enum bp_embedded_type {
	BP_EMBEDDED_TYPE_DATA,
	BP_EMBEDDED_TYPE_RESERVED, /* Reserved for an unintegrated feature. */
	NUM_BP_EMBEDDED_TYPES = BP_EMBEDDED_TYPE_RESERVED
} bp_embedded_type_t;

#define	BPE_NUM_WORDS 14
#define	BPE_PAYLOAD_SIZE (BPE_NUM_WORDS * sizeof (uint64_t))
#define	BPE_IS_PAYLOADWORD(bp, wp) \
	((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)

#define	SPA_BLKPTRSHIFT	7		/* blkptr_t is 128 bytes	*/
#define	SPA_DVAS_PER_BP	3		/* Number of DVAs in a bp	*/

/*
 * A block is a hole when it has either 1) never been written to, or
 * 2) is zero-filled. In both cases, ZFS can return all zeroes for all reads
 * without physically allocating disk space. Holes are represented in the
 * blkptr_t structure by zeroed blk_dva. Correct checking for holes is
 * done through the BP_IS_HOLE macro. For holes, the logical size, level,
 * DMU object type, and birth times are all also stored for holes that
 * were written to at some point (i.e. were punched after having been filled).
 */
typedef struct blkptr {
	dva_t		blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
	uint64_t	blk_prop;	/* size, compression, type, etc	    */
	uint64_t	blk_pad[2];	/* Extra space for the future	    */
	uint64_t	blk_phys_birth;	/* txg when block was allocated	    */
	uint64_t	blk_birth;	/* transaction group at birth	    */
	uint64_t	blk_fill;	/* fill count			    */
	zio_cksum_t	blk_cksum;	/* 256-bit checksum		    */
} blkptr_t;

/*
 * Macros to get and set fields in a bp or DVA.
 */
#define	DVA_GET_ASIZE(dva)	\
	BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0)
#define	DVA_SET_ASIZE(dva, x)	\
	BF64_SET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, \
	SPA_MINBLOCKSHIFT, 0, x)

#define	DVA_GET_GRID(dva)	BF64_GET((dva)->dva_word[0], 24, 8)
#define	DVA_SET_GRID(dva, x)	BF64_SET((dva)->dva_word[0], 24, 8, x)

#define	DVA_GET_VDEV(dva)	BF64_GET((dva)->dva_word[0], 32, 32)
#define	DVA_SET_VDEV(dva, x)	BF64_SET((dva)->dva_word[0], 32, 32, x)

#define	DVA_GET_OFFSET(dva)	\
	BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
#define	DVA_SET_OFFSET(dva, x)	\
	BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)

#define	DVA_GET_GANG(dva)	BF64_GET((dva)->dva_word[1], 63, 1)
#define	DVA_SET_GANG(dva, x)	BF64_SET((dva)->dva_word[1], 63, 1, x)

#define	BP_GET_LSIZE(bp)	\
	(BP_IS_EMBEDDED(bp) ?	\
	(BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA ? BPE_GET_LSIZE(bp) : 0): \
	BF64_GET_SB((bp)->blk_prop, 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1))
#define	BP_SET_LSIZE(bp, x)	do { \
	ASSERT(!BP_IS_EMBEDDED(bp)); \
	BF64_SET_SB((bp)->blk_prop, \
	    0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
_NOTE(CONSTCOND) } while (0)

#define	BP_GET_PSIZE(bp)	\
	(BP_IS_EMBEDDED(bp) ? 0 : \
	BF64_GET_SB((bp)->blk_prop, 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1))
#define	BP_SET_PSIZE(bp, x)	do { \
	ASSERT(!BP_IS_EMBEDDED(bp)); \
	BF64_SET_SB((bp)->blk_prop, \
	    16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
_NOTE(CONSTCOND) } while (0)

#define	BP_GET_COMPRESS(bp)		BF64_GET((bp)->blk_prop, 32, 7)
#define	BP_SET_COMPRESS(bp, x)		BF64_SET((bp)->blk_prop, 32, 7, x)

#define	BP_IS_EMBEDDED(bp)		BF64_GET((bp)->blk_prop, 39, 1)
#define	BP_SET_EMBEDDED(bp, x)		BF64_SET((bp)->blk_prop, 39, 1, x)

#define	BP_GET_CHECKSUM(bp)		\
	(BP_IS_EMBEDDED(bp) ? ZIO_CHECKSUM_OFF : \
	BF64_GET((bp)->blk_prop, 40, 8))
#define	BP_SET_CHECKSUM(bp, x)		do { \
	ASSERT(!BP_IS_EMBEDDED(bp)); \
	BF64_SET((bp)->blk_prop, 40, 8, x); \
_NOTE(CONSTCOND) } while (0)

#define	BP_GET_TYPE(bp)			BF64_GET((bp)->blk_prop, 48, 8)
#define	BP_SET_TYPE(bp, x)		BF64_SET((bp)->blk_prop, 48, 8, x)

#define	BP_GET_LEVEL(bp)		BF64_GET((bp)->blk_prop, 56, 5)
#define	BP_SET_LEVEL(bp, x)		BF64_SET((bp)->blk_prop, 56, 5, x)

#define	BP_GET_DEDUP(bp)		BF64_GET((bp)->blk_prop, 62, 1)
#define	BP_SET_DEDUP(bp, x)		BF64_SET((bp)->blk_prop, 62, 1, x)

#define	BP_GET_BYTEORDER(bp)		BF64_GET((bp)->blk_prop, 63, 1)
#define	BP_SET_BYTEORDER(bp, x)		BF64_SET((bp)->blk_prop, 63, 1, x)

#define	BP_PHYSICAL_BIRTH(bp)		\
	(BP_IS_EMBEDDED(bp) ? 0 : \
	(bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)

#define	BP_SET_BIRTH(bp, logical, physical)	\
{						\
	ASSERT(!BP_IS_EMBEDDED(bp));		\
	(bp)->blk_birth = (logical);		\
	(bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \
}

#define	BP_GET_FILL(bp) (BP_IS_EMBEDDED(bp) ? 1 : (bp)->blk_fill)

#define	BP_GET_ASIZE(bp)	\
	(BP_IS_EMBEDDED(bp) ? 0 : \
	DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
	DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
	DVA_GET_ASIZE(&(bp)->blk_dva[2]))

#define	BP_GET_UCSIZE(bp) \
	((BP_GET_LEVEL(bp) > 0 || DMU_OT_IS_METADATA(BP_GET_TYPE(bp))) ? \
	BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp))

#define	BP_GET_NDVAS(bp)	\
	(BP_IS_EMBEDDED(bp) ? 0 : \
	!!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
	!!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
	!!DVA_GET_ASIZE(&(bp)->blk_dva[2]))

#define	BP_COUNT_GANG(bp)	\
	(BP_IS_EMBEDDED(bp) ? 0 : \
	(DVA_GET_GANG(&(bp)->blk_dva[0]) + \
	DVA_GET_GANG(&(bp)->blk_dva[1]) + \
	DVA_GET_GANG(&(bp)->blk_dva[2])))

#define	DVA_EQUAL(dva1, dva2)	\
	((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
	(dva1)->dva_word[0] == (dva2)->dva_word[0])

#define	BP_EQUAL(bp1, bp2)	\
	(BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) &&	\
	(bp1)->blk_birth == (bp2)->blk_birth &&			\
	DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) &&	\
	DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) &&	\
	DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2]))

#define	ZIO_CHECKSUM_EQUAL(zc1, zc2) \
	(0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
	((zc1).zc_word[1] - (zc2).zc_word[1]) | \
	((zc1).zc_word[2] - (zc2).zc_word[2]) | \
	((zc1).zc_word[3] - (zc2).zc_word[3])))

#define	DVA_IS_VALID(dva)	(DVA_GET_ASIZE(dva) != 0)

#define	ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3)	\
{						\
	(zcp)->zc_word[0] = w0;			\
	(zcp)->zc_word[1] = w1;			\
	(zcp)->zc_word[2] = w2;			\
	(zcp)->zc_word[3] = w3;			\
}

#define	BP_IDENTITY(bp)		(ASSERT(!BP_IS_EMBEDDED(bp)), &(bp)->blk_dva[0])
#define	BP_IS_GANG(bp)		\
	(BP_IS_EMBEDDED(bp) ? B_FALSE : DVA_GET_GANG(BP_IDENTITY(bp)))
#define	DVA_IS_EMPTY(dva)	((dva)->dva_word[0] == 0ULL &&	\
				(dva)->dva_word[1] == 0ULL)
#define	BP_IS_HOLE(bp) \
	(!BP_IS_EMBEDDED(bp) && DVA_IS_EMPTY(BP_IDENTITY(bp)))

/* BP_IS_RAIDZ(bp) assumes no block compression */
#define	BP_IS_RAIDZ(bp)		(DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \
				BP_GET_PSIZE(bp))

#define	BP_ZERO(bp)				\
{						\
	(bp)->blk_dva[0].dva_word[0] = 0;	\
	(bp)->blk_dva[0].dva_word[1] = 0;	\
	(bp)->blk_dva[1].dva_word[0] = 0;	\
	(bp)->blk_dva[1].dva_word[1] = 0;	\
	(bp)->blk_dva[2].dva_word[0] = 0;	\
	(bp)->blk_dva[2].dva_word[1] = 0;	\
	(bp)->blk_prop = 0;			\
	(bp)->blk_pad[0] = 0;			\
	(bp)->blk_pad[1] = 0;			\
	(bp)->blk_phys_birth = 0;		\
	(bp)->blk_birth = 0;			\
	(bp)->blk_fill = 0;			\
	ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0);	\
}

#ifdef _BIG_ENDIAN
#define	ZFS_HOST_BYTEORDER	(0ULL)
#else
#define	ZFS_HOST_BYTEORDER	(1ULL)
#endif

#define	BP_SHOULD_BYTESWAP(bp)	(BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)

#define	BP_SPRINTF_LEN	320

/*
 * This macro allows code sharing between zfs, libzpool, and mdb.
 * 'func' is either snprintf() or mdb_snprintf().
 * 'ws' (whitespace) can be ' ' for single-line format, '\n' for multi-line.
 */
#define	SNPRINTF_BLKPTR(func, ws, buf, size, bp, type, checksum, compress) \
{									\
	static const char *copyname[] =					\
	    { "zero", "single", "double", "triple" };			\
	int len = 0;							\
	int copies = 0;							\
	int d;								\
									\
	if (bp == NULL) {						\
		len += func(buf + len, size - len, "<NULL>");		\
	} else if (BP_IS_HOLE(bp)) {					\
		len += func(buf + len, size - len,			\
		    "HOLE [L%llu %s] "					\
		    "size=%llxL birth=%lluL",				\
		    (u_longlong_t)BP_GET_LEVEL(bp),			\
		    type,						\
		    (u_longlong_t)BP_GET_LSIZE(bp),			\
		    (u_longlong_t)bp->blk_birth);			\
	} else if (BP_IS_EMBEDDED(bp)) {				\
		len = func(buf + len, size - len,			\
		    "EMBEDDED [L%llu %s] et=%u %s "			\
		    "size=%llxL/%llxP birth=%lluL",			\
		    (u_longlong_t)BP_GET_LEVEL(bp),			\
		    type,						\
		    (int)BPE_GET_ETYPE(bp),				\
		    compress,						\
		    (u_longlong_t)BPE_GET_LSIZE(bp),			\
		    (u_longlong_t)BPE_GET_PSIZE(bp),			\
		    (u_longlong_t)bp->blk_birth);			\
	} else {							\
		for (d = 0; d < BP_GET_NDVAS(bp); d++) {		\
			const dva_t *dva = &bp->blk_dva[d];		\
			if (DVA_IS_VALID(dva))				\
				copies++;				\
			len += func(buf + len, size - len,		\
			    "DVA[%d]=<%llu:%llx:%llx>%c", d,		\
			    (u_longlong_t)DVA_GET_VDEV(dva),		\
			    (u_longlong_t)DVA_GET_OFFSET(dva),		\
			    (u_longlong_t)DVA_GET_ASIZE(dva),		\
			    ws);					\
		}							\
		if (BP_IS_GANG(bp) &&					\
		    DVA_GET_ASIZE(&bp->blk_dva[2]) <=			\
		    DVA_GET_ASIZE(&bp->blk_dva[1]) / 2)			\
			copies--;					\
		len += func(buf + len, size - len,			\
		    "[L%llu %s] %s %s %s %s %s %s%c"			\
		    "size=%llxL/%llxP birth=%lluL/%lluP fill=%llu%c"	\
		    "cksum=%llx:%llx:%llx:%llx",			\
		    (u_longlong_t)BP_GET_LEVEL(bp),			\
		    type,						\
		    checksum,						\
		    compress,						\
		    BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE",		\
		    BP_IS_GANG(bp) ? "gang" : "contiguous",		\
		    BP_GET_DEDUP(bp) ? "dedup" : "unique",		\
		    copyname[copies],					\
		    ws,							\
		    (u_longlong_t)BP_GET_LSIZE(bp),			\
		    (u_longlong_t)BP_GET_PSIZE(bp),			\
		    (u_longlong_t)bp->blk_birth,			\
		    (u_longlong_t)BP_PHYSICAL_BIRTH(bp),		\
		    (u_longlong_t)BP_GET_FILL(bp),			\
		    ws,							\
		    (u_longlong_t)bp->blk_cksum.zc_word[0],		\
		    (u_longlong_t)bp->blk_cksum.zc_word[1],		\
		    (u_longlong_t)bp->blk_cksum.zc_word[2],		\
		    (u_longlong_t)bp->blk_cksum.zc_word[3]);		\
	}								\
	ASSERT(len < size);						\
}

#include <sys/dmu.h>

#define	BP_GET_BUFC_TYPE(bp)						\
	(((BP_GET_LEVEL(bp) > 0) || (DMU_OT_IS_METADATA(BP_GET_TYPE(bp)))) ? \
	ARC_BUFC_METADATA : ARC_BUFC_DATA)

typedef enum spa_import_type {
	SPA_IMPORT_EXISTING,
	SPA_IMPORT_ASSEMBLE
} spa_import_type_t;

/* state manipulation functions */
extern int spa_open(const char *pool, spa_t **, void *tag);
extern int spa_open_rewind(const char *pool, spa_t **, void *tag,
    nvlist_t *policy, nvlist_t **config);
extern int spa_get_stats(const char *pool, nvlist_t **config, char *altroot,
    size_t buflen);
extern int spa_create(const char *pool, nvlist_t *config, nvlist_t *props,
    nvlist_t *zplprops);
extern int spa_import_rootpool(char *devpath, char *devid);
extern int spa_import(char *pool, nvlist_t *config, nvlist_t *props,
    uint64_t flags);
extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
extern int spa_destroy(char *pool);
extern int spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
    boolean_t hardforce);
extern int spa_reset(char *pool);
extern void spa_async_request(spa_t *spa, int flag);
extern void spa_async_unrequest(spa_t *spa, int flag);
extern void spa_async_suspend(spa_t *spa);
extern void spa_async_resume(spa_t *spa);
extern spa_t *spa_inject_addref(char *pool);
extern void spa_inject_delref(spa_t *spa);
extern void spa_scan_stat_init(spa_t *spa);
extern int spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps);

#define	SPA_ASYNC_CONFIG_UPDATE	0x01
#define	SPA_ASYNC_REMOVE	0x02
#define	SPA_ASYNC_PROBE		0x04
#define	SPA_ASYNC_RESILVER_DONE	0x08
#define	SPA_ASYNC_RESILVER	0x10
#define	SPA_ASYNC_AUTOEXPAND	0x20
#define	SPA_ASYNC_REMOVE_DONE	0x40
#define	SPA_ASYNC_REMOVE_STOP	0x80

/*
 * Controls the behavior of spa_vdev_remove().
 */
#define	SPA_REMOVE_UNSPARE	0x01
#define	SPA_REMOVE_DONE		0x02

/* device manipulation */
extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot);
extern int spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot,
    int replacing);
extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid,
    int replace_done);
extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
extern boolean_t spa_vdev_remove_active(spa_t *spa);
extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath);
extern int spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru);
extern int spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config,
    nvlist_t *props, boolean_t exp);

/* spare state (which is global across all pools) */
extern void spa_spare_add(vdev_t *vd);
extern void spa_spare_remove(vdev_t *vd);
extern boolean_t spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt);
extern void spa_spare_activate(vdev_t *vd);

/* L2ARC state (which is global across all pools) */
extern void spa_l2cache_add(vdev_t *vd);
extern void spa_l2cache_remove(vdev_t *vd);
extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
extern void spa_l2cache_activate(vdev_t *vd);
extern void spa_l2cache_drop(spa_t *spa);

/* scanning */
extern int spa_scan(spa_t *spa, pool_scan_func_t func);
extern int spa_scan_stop(spa_t *spa);

/* spa syncing */
extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
extern void spa_sync_allpools(void);

extern int zfs_sync_pass_deferred_free;

/* spa namespace global mutex */
extern kmutex_t spa_namespace_lock;

/*
 * SPA configuration functions in spa_config.c
 */

#define	SPA_CONFIG_UPDATE_POOL	0
#define	SPA_CONFIG_UPDATE_VDEVS	1

extern void spa_config_sync(spa_t *, boolean_t, boolean_t);
extern void spa_config_load(void);
extern nvlist_t *spa_all_configs(uint64_t *);
extern void spa_config_set(spa_t *spa, nvlist_t *config);
extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
    int getstats);
extern void spa_config_update(spa_t *spa, int what);

/*
 * Miscellaneous SPA routines in spa_misc.c
 */

/* Namespace manipulation */
extern spa_t *spa_lookup(const char *name);
extern spa_t *spa_add(const char *name, nvlist_t *config, const char *altroot);
extern void spa_remove(spa_t *spa);
extern spa_t *spa_next(spa_t *prev);

/* Refcount functions */
extern void spa_open_ref(spa_t *spa, void *tag);
extern void spa_close(spa_t *spa, void *tag);
extern void spa_async_close(spa_t *spa, void *tag);
extern boolean_t spa_refcount_zero(spa_t *spa);

#define	SCL_NONE	0x00
#define	SCL_CONFIG	0x01
#define	SCL_STATE	0x02
#define	SCL_L2ARC	0x04		/* hack until L2ARC 2.0 */
#define	SCL_ALLOC	0x08
#define	SCL_ZIO		0x10
#define	SCL_FREE	0x20
#define	SCL_VDEV	0x40
#define	SCL_LOCKS	7
#define	SCL_ALL		((1 << SCL_LOCKS) - 1)
#define	SCL_STATE_ALL	(SCL_STATE | SCL_L2ARC | SCL_ZIO)

/* Historical pool statistics */
typedef struct spa_stats_history {
	kmutex_t		lock;
	uint64_t		count;
	uint64_t		size;
	kstat_t			*kstat;
	void			*private;
	list_t			list;
} spa_stats_history_t;

typedef struct spa_stats {
	spa_stats_history_t	read_history;
	spa_stats_history_t	txg_history;
	spa_stats_history_t	tx_assign_histogram;
	spa_stats_history_t	io_history;
} spa_stats_t;

typedef enum txg_state {
	TXG_STATE_BIRTH		= 0,
	TXG_STATE_OPEN		= 1,
	TXG_STATE_QUIESCED	= 2,
	TXG_STATE_WAIT_FOR_SYNC	= 3,
	TXG_STATE_SYNCED	= 4,
	TXG_STATE_COMMITTED	= 5,
} txg_state_t;

extern void spa_stats_init(spa_t *spa);
extern void spa_stats_destroy(spa_t *spa);
extern void spa_read_history_add(spa_t *spa, const zbookmark_phys_t *zb,
    uint32_t aflags);
extern void spa_txg_history_add(spa_t *spa, uint64_t txg, hrtime_t birth_time);
extern int spa_txg_history_set(spa_t *spa,  uint64_t txg,
    txg_state_t completed_state, hrtime_t completed_time);
extern int spa_txg_history_set_io(spa_t *spa,  uint64_t txg, uint64_t nread,
    uint64_t nwritten, uint64_t reads, uint64_t writes, uint64_t ndirty);
extern void spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs);

/* Pool configuration locks */
extern int spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw);
extern void spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw);
extern void spa_config_exit(spa_t *spa, int locks, void *tag);
extern int spa_config_held(spa_t *spa, int locks, krw_t rw);

/* Pool vdev add/remove lock */
extern uint64_t spa_vdev_enter(spa_t *spa);
extern uint64_t spa_vdev_config_enter(spa_t *spa);
extern void spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg,
    int error, char *tag);
extern int spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error);

/* Pool vdev state change lock */
extern void spa_vdev_state_enter(spa_t *spa, int oplock);
extern int spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error);

/* Log state */
typedef enum spa_log_state {
	SPA_LOG_UNKNOWN = 0,	/* unknown log state */
	SPA_LOG_MISSING,	/* missing log(s) */
	SPA_LOG_CLEAR,		/* clear the log(s) */
	SPA_LOG_GOOD,		/* log(s) are good */
} spa_log_state_t;

extern spa_log_state_t spa_get_log_state(spa_t *spa);
extern void spa_set_log_state(spa_t *spa, spa_log_state_t state);
extern int spa_offline_log(spa_t *spa);

/* Log claim callback */
extern void spa_claim_notify(zio_t *zio);
extern void spa_deadman(void *);

/* Accessor functions */
extern boolean_t spa_shutting_down(spa_t *spa);
extern struct dsl_pool *spa_get_dsl(spa_t *spa);
extern boolean_t spa_is_initializing(spa_t *spa);
extern blkptr_t *spa_get_rootblkptr(spa_t *spa);
extern void spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp);
extern void spa_altroot(spa_t *, char *, size_t);
extern int spa_sync_pass(spa_t *spa);
extern char *spa_name(spa_t *spa);
extern uint64_t spa_guid(spa_t *spa);
extern uint64_t spa_load_guid(spa_t *spa);
extern uint64_t spa_last_synced_txg(spa_t *spa);
extern uint64_t spa_first_txg(spa_t *spa);
extern uint64_t spa_syncing_txg(spa_t *spa);
extern uint64_t spa_version(spa_t *spa);
extern pool_state_t spa_state(spa_t *spa);
extern spa_load_state_t spa_load_state(spa_t *spa);
extern uint64_t spa_freeze_txg(spa_t *spa);
extern uint64_t spa_get_asize(spa_t *spa, uint64_t lsize);
extern uint64_t spa_get_dspace(spa_t *spa);
extern void spa_update_dspace(spa_t *spa);
extern uint64_t spa_version(spa_t *spa);
extern boolean_t spa_deflate(spa_t *spa);
extern metaslab_class_t *spa_normal_class(spa_t *spa);
extern metaslab_class_t *spa_log_class(spa_t *spa);
extern void spa_evicting_os_register(spa_t *, objset_t *os);
extern void spa_evicting_os_deregister(spa_t *, objset_t *os);
extern void spa_evicting_os_wait(spa_t *spa);
extern int spa_max_replication(spa_t *spa);
extern int spa_prev_software_version(spa_t *spa);
extern uint8_t spa_get_failmode(spa_t *spa);
extern boolean_t spa_suspended(spa_t *spa);
extern uint64_t spa_bootfs(spa_t *spa);
extern uint64_t spa_delegation(spa_t *spa);
extern objset_t *spa_meta_objset(spa_t *spa);
extern uint64_t spa_deadman_synctime(spa_t *spa);

/* Miscellaneous support routines */
extern void spa_activate_mos_feature(spa_t *spa, const char *feature,
    dmu_tx_t *tx);
extern void spa_deactivate_mos_feature(spa_t *spa, const char *feature);
extern int spa_rename(const char *oldname, const char *newname);
extern spa_t *spa_by_guid(uint64_t pool_guid, uint64_t device_guid);
extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
extern char *spa_strdup(const char *);
extern void spa_strfree(char *);
extern uint64_t spa_get_random(uint64_t range);
extern uint64_t spa_generate_guid(spa_t *spa);
extern void snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp);
extern void spa_freeze(spa_t *spa);
extern int spa_change_guid(spa_t *spa);
extern void spa_upgrade(spa_t *spa, uint64_t version);
extern void spa_evict_all(void);
extern vdev_t *spa_lookup_by_guid(spa_t *spa, uint64_t guid,
    boolean_t l2cache);
extern boolean_t spa_has_spare(spa_t *, uint64_t guid);
extern uint64_t dva_get_dsize_sync(spa_t *spa, const dva_t *dva);
extern uint64_t bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp);
extern uint64_t bp_get_dsize(spa_t *spa, const blkptr_t *bp);
extern boolean_t spa_has_slogs(spa_t *spa);
extern boolean_t spa_is_root(spa_t *spa);
extern boolean_t spa_writeable(spa_t *spa);
extern boolean_t spa_has_pending_synctask(spa_t *spa);

extern int spa_mode(spa_t *spa);
extern uint64_t strtonum(const char *str, char **nptr);

extern char *spa_his_ievent_table[];

extern void spa_history_create_obj(spa_t *spa, dmu_tx_t *tx);
extern int spa_history_get(spa_t *spa, uint64_t *offset, uint64_t *len_read,
    char *his_buf);
extern int spa_history_log(spa_t *spa, const char *his_buf);
extern int spa_history_log_nvl(spa_t *spa, nvlist_t *nvl);
extern void spa_history_log_version(spa_t *spa, const char *operation);
extern void spa_history_log_internal(spa_t *spa, const char *operation,
    dmu_tx_t *tx, const char *fmt, ...);
extern void spa_history_log_internal_ds(struct dsl_dataset *ds, const char *op,
    dmu_tx_t *tx, const char *fmt, ...);
extern void spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
    dmu_tx_t *tx, const char *fmt, ...);

/* error handling */
struct zbookmark_phys;
extern void spa_log_error(spa_t *spa, zio_t *zio);
extern void zfs_ereport_post(const char *class, spa_t *spa, vdev_t *vd,
    zio_t *zio, uint64_t stateoroffset, uint64_t length);
extern void zfs_post_remove(spa_t *spa, vdev_t *vd);
extern void zfs_post_state_change(spa_t *spa, vdev_t *vd);
extern void zfs_post_autoreplace(spa_t *spa, vdev_t *vd);
extern uint64_t spa_get_errlog_size(spa_t *spa);
extern int spa_get_errlog(spa_t *spa, void *uaddr, size_t *count);
extern void spa_errlog_rotate(spa_t *spa);
extern void spa_errlog_drain(spa_t *spa);
extern void spa_errlog_sync(spa_t *spa, uint64_t txg);
extern void spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub);

/* vdev cache */
extern void vdev_cache_stat_init(void);
extern void vdev_cache_stat_fini(void);

/* Initialization and termination */
extern void spa_init(int flags);
extern void spa_fini(void);
extern void spa_boot_init(void);

/* properties */
extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
extern int spa_prop_get(spa_t *spa, nvlist_t **nvp);
extern void spa_prop_clear_bootfs(spa_t *spa, uint64_t obj, dmu_tx_t *tx);
extern void spa_configfile_set(spa_t *, nvlist_t *, boolean_t);

/* asynchronous event notification */
extern void spa_event_notify(spa_t *spa, vdev_t *vdev, const char *name);

#ifdef ZFS_DEBUG
#define	dprintf_bp(bp, fmt, ...) do {				\
	if (zfs_flags & ZFS_DEBUG_DPRINTF) {			\
	char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP);	\
	snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp));	\
	dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf);		\
	kmem_free(__blkbuf, BP_SPRINTF_LEN);			\
	} \
_NOTE(CONSTCOND) } while (0)
#else
#define	dprintf_bp(bp, fmt, ...)
#endif

extern boolean_t spa_debug_enabled(spa_t *spa);
#define	spa_dbgmsg(spa, ...)			\
{						\
	if (spa_debug_enabled(spa))		\
		zfs_dbgmsg(__VA_ARGS__);	\
}

extern int spa_mode_global;			/* mode, e.g. FREAD | FWRITE */

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_SPA_H */