xref: /illumos-gate/usr/src/uts/common/fs/zfs/sys/spa.h (revision 61e255ce7267b52208af9daf434b77d37fb75622)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23  * Copyright (c) 2011, 2016 by Delphix. All rights reserved.
24  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
25  * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
26  * Copyright 2013 Saso Kiselkov. All rights reserved.
27  * Copyright (c) 2014 Integros [integros.com]
28  */
29 
30 #ifndef _SYS_SPA_H
31 #define	_SYS_SPA_H
32 
33 #include <sys/avl.h>
34 #include <sys/zfs_context.h>
35 #include <sys/nvpair.h>
36 #include <sys/sysmacros.h>
37 #include <sys/types.h>
38 #include <sys/fs/zfs.h>
39 #include <sys/dmu.h>
40 
41 #ifdef	__cplusplus
42 extern "C" {
43 #endif
44 
45 /*
46  * Forward references that lots of things need.
47  */
48 typedef struct spa spa_t;
49 typedef struct vdev vdev_t;
50 typedef struct metaslab metaslab_t;
51 typedef struct metaslab_group metaslab_group_t;
52 typedef struct metaslab_class metaslab_class_t;
53 typedef struct zio zio_t;
54 typedef struct zilog zilog_t;
55 typedef struct spa_aux_vdev spa_aux_vdev_t;
56 typedef struct ddt ddt_t;
57 typedef struct ddt_entry ddt_entry_t;
58 struct dsl_pool;
59 struct dsl_dataset;
60 
61 /*
62  * General-purpose 32-bit and 64-bit bitfield encodings.
63  */
64 #define	BF32_DECODE(x, low, len)	P2PHASE((x) >> (low), 1U << (len))
65 #define	BF64_DECODE(x, low, len)	P2PHASE((x) >> (low), 1ULL << (len))
66 #define	BF32_ENCODE(x, low, len)	(P2PHASE((x), 1U << (len)) << (low))
67 #define	BF64_ENCODE(x, low, len)	(P2PHASE((x), 1ULL << (len)) << (low))
68 
69 #define	BF32_GET(x, low, len)		BF32_DECODE(x, low, len)
70 #define	BF64_GET(x, low, len)		BF64_DECODE(x, low, len)
71 
72 #define	BF32_SET(x, low, len, val) do { \
73 	ASSERT3U(val, <, 1U << (len)); \
74 	ASSERT3U(low + len, <=, 32); \
75 	(x) ^= BF32_ENCODE((x >> low) ^ (val), low, len); \
76 _NOTE(CONSTCOND) } while (0)
77 
78 #define	BF64_SET(x, low, len, val) do { \
79 	ASSERT3U(val, <, 1ULL << (len)); \
80 	ASSERT3U(low + len, <=, 64); \
81 	((x) ^= BF64_ENCODE((x >> low) ^ (val), low, len)); \
82 _NOTE(CONSTCOND) } while (0)
83 
84 #define	BF32_GET_SB(x, low, len, shift, bias)	\
85 	((BF32_GET(x, low, len) + (bias)) << (shift))
86 #define	BF64_GET_SB(x, low, len, shift, bias)	\
87 	((BF64_GET(x, low, len) + (bias)) << (shift))
88 
89 #define	BF32_SET_SB(x, low, len, shift, bias, val) do { \
90 	ASSERT(IS_P2ALIGNED(val, 1U << shift)); \
91 	ASSERT3S((val) >> (shift), >=, bias); \
92 	BF32_SET(x, low, len, ((val) >> (shift)) - (bias)); \
93 _NOTE(CONSTCOND) } while (0)
94 #define	BF64_SET_SB(x, low, len, shift, bias, val) do { \
95 	ASSERT(IS_P2ALIGNED(val, 1ULL << shift)); \
96 	ASSERT3S((val) >> (shift), >=, bias); \
97 	BF64_SET(x, low, len, ((val) >> (shift)) - (bias)); \
98 _NOTE(CONSTCOND) } while (0)
99 
100 /*
101  * We currently support block sizes from 512 bytes to 16MB.
102  * The benefits of larger blocks, and thus larger IO, need to be weighed
103  * against the cost of COWing a giant block to modify one byte, and the
104  * large latency of reading or writing a large block.
105  *
106  * Note that although blocks up to 16MB are supported, the recordsize
107  * property can not be set larger than zfs_max_recordsize (default 1MB).
108  * See the comment near zfs_max_recordsize in dsl_dataset.c for details.
109  *
110  * Note that although the LSIZE field of the blkptr_t can store sizes up
111  * to 32MB, the dnode's dn_datablkszsec can only store sizes up to
112  * 32MB - 512 bytes.  Therefore, we limit SPA_MAXBLOCKSIZE to 16MB.
113  */
114 #define	SPA_MINBLOCKSHIFT	9
115 #define	SPA_OLD_MAXBLOCKSHIFT	17
116 #define	SPA_MAXBLOCKSHIFT	24
117 #define	SPA_MINBLOCKSIZE	(1ULL << SPA_MINBLOCKSHIFT)
118 #define	SPA_OLD_MAXBLOCKSIZE	(1ULL << SPA_OLD_MAXBLOCKSHIFT)
119 #define	SPA_MAXBLOCKSIZE	(1ULL << SPA_MAXBLOCKSHIFT)
120 
121 /*
122  * Size of block to hold the configuration data (a packed nvlist)
123  */
124 #define	SPA_CONFIG_BLOCKSIZE	(1ULL << 14)
125 
126 /*
127  * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
128  * The ASIZE encoding should be at least 64 times larger (6 more bits)
129  * to support up to 4-way RAID-Z mirror mode with worst-case gang block
130  * overhead, three DVAs per bp, plus one more bit in case we do anything
131  * else that expands the ASIZE.
132  */
133 #define	SPA_LSIZEBITS		16	/* LSIZE up to 32M (2^16 * 512)	*/
134 #define	SPA_PSIZEBITS		16	/* PSIZE up to 32M (2^16 * 512)	*/
135 #define	SPA_ASIZEBITS		24	/* ASIZE up to 64 times larger	*/
136 
137 #define	SPA_COMPRESSBITS	7
138 
139 /*
140  * All SPA data is represented by 128-bit data virtual addresses (DVAs).
141  * The members of the dva_t should be considered opaque outside the SPA.
142  */
143 typedef struct dva {
144 	uint64_t	dva_word[2];
145 } dva_t;
146 
147 /*
148  * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
149  */
150 typedef struct zio_cksum {
151 	uint64_t	zc_word[4];
152 } zio_cksum_t;
153 
154 /*
155  * Some checksums/hashes need a 256-bit initialization salt. This salt is kept
156  * secret and is suitable for use in MAC algorithms as the key.
157  */
158 typedef struct zio_cksum_salt {
159 	uint8_t		zcs_bytes[32];
160 } zio_cksum_salt_t;
161 
162 /*
163  * Each block is described by its DVAs, time of birth, checksum, etc.
164  * The word-by-word, bit-by-bit layout of the blkptr is as follows:
165  *
166  *	64	56	48	40	32	24	16	8	0
167  *	+-------+-------+-------+-------+-------+-------+-------+-------+
168  * 0	|		vdev1		| GRID  |	  ASIZE		|
169  *	+-------+-------+-------+-------+-------+-------+-------+-------+
170  * 1	|G|			 offset1				|
171  *	+-------+-------+-------+-------+-------+-------+-------+-------+
172  * 2	|		vdev2		| GRID  |	  ASIZE		|
173  *	+-------+-------+-------+-------+-------+-------+-------+-------+
174  * 3	|G|			 offset2				|
175  *	+-------+-------+-------+-------+-------+-------+-------+-------+
176  * 4	|		vdev3		| GRID  |	  ASIZE		|
177  *	+-------+-------+-------+-------+-------+-------+-------+-------+
178  * 5	|G|			 offset3				|
179  *	+-------+-------+-------+-------+-------+-------+-------+-------+
180  * 6	|BDX|lvl| type	| cksum |E| comp|    PSIZE	|     LSIZE	|
181  *	+-------+-------+-------+-------+-------+-------+-------+-------+
182  * 7	|			padding					|
183  *	+-------+-------+-------+-------+-------+-------+-------+-------+
184  * 8	|			padding					|
185  *	+-------+-------+-------+-------+-------+-------+-------+-------+
186  * 9	|			physical birth txg			|
187  *	+-------+-------+-------+-------+-------+-------+-------+-------+
188  * a	|			logical birth txg			|
189  *	+-------+-------+-------+-------+-------+-------+-------+-------+
190  * b	|			fill count				|
191  *	+-------+-------+-------+-------+-------+-------+-------+-------+
192  * c	|			checksum[0]				|
193  *	+-------+-------+-------+-------+-------+-------+-------+-------+
194  * d	|			checksum[1]				|
195  *	+-------+-------+-------+-------+-------+-------+-------+-------+
196  * e	|			checksum[2]				|
197  *	+-------+-------+-------+-------+-------+-------+-------+-------+
198  * f	|			checksum[3]				|
199  *	+-------+-------+-------+-------+-------+-------+-------+-------+
200  *
201  * Legend:
202  *
203  * vdev		virtual device ID
204  * offset	offset into virtual device
205  * LSIZE	logical size
206  * PSIZE	physical size (after compression)
207  * ASIZE	allocated size (including RAID-Z parity and gang block headers)
208  * GRID		RAID-Z layout information (reserved for future use)
209  * cksum	checksum function
210  * comp		compression function
211  * G		gang block indicator
212  * B		byteorder (endianness)
213  * D		dedup
214  * X		encryption (on version 30, which is not supported)
215  * E		blkptr_t contains embedded data (see below)
216  * lvl		level of indirection
217  * type		DMU object type
218  * phys birth	txg of block allocation; zero if same as logical birth txg
219  * log. birth	transaction group in which the block was logically born
220  * fill count	number of non-zero blocks under this bp
221  * checksum[4]	256-bit checksum of the data this bp describes
222  */
223 
224 /*
225  * "Embedded" blkptr_t's don't actually point to a block, instead they
226  * have a data payload embedded in the blkptr_t itself.  See the comment
227  * in blkptr.c for more details.
228  *
229  * The blkptr_t is laid out as follows:
230  *
231  *	64	56	48	40	32	24	16	8	0
232  *	+-------+-------+-------+-------+-------+-------+-------+-------+
233  * 0	|      payload                                                  |
234  * 1	|      payload                                                  |
235  * 2	|      payload                                                  |
236  * 3	|      payload                                                  |
237  * 4	|      payload                                                  |
238  * 5	|      payload                                                  |
239  *	+-------+-------+-------+-------+-------+-------+-------+-------+
240  * 6	|BDX|lvl| type	| etype |E| comp| PSIZE|              LSIZE	|
241  *	+-------+-------+-------+-------+-------+-------+-------+-------+
242  * 7	|      payload                                                  |
243  * 8	|      payload                                                  |
244  * 9	|      payload                                                  |
245  *	+-------+-------+-------+-------+-------+-------+-------+-------+
246  * a	|			logical birth txg			|
247  *	+-------+-------+-------+-------+-------+-------+-------+-------+
248  * b	|      payload                                                  |
249  * c	|      payload                                                  |
250  * d	|      payload                                                  |
251  * e	|      payload                                                  |
252  * f	|      payload                                                  |
253  *	+-------+-------+-------+-------+-------+-------+-------+-------+
254  *
255  * Legend:
256  *
257  * payload		contains the embedded data
258  * B (byteorder)	byteorder (endianness)
259  * D (dedup)		padding (set to zero)
260  * X			encryption (set to zero; see above)
261  * E (embedded)		set to one
262  * lvl			indirection level
263  * type			DMU object type
264  * etype		how to interpret embedded data (BP_EMBEDDED_TYPE_*)
265  * comp			compression function of payload
266  * PSIZE		size of payload after compression, in bytes
267  * LSIZE		logical size of payload, in bytes
268  *			note that 25 bits is enough to store the largest
269  *			"normal" BP's LSIZE (2^16 * 2^9) in bytes
270  * log. birth		transaction group in which the block was logically born
271  *
272  * Note that LSIZE and PSIZE are stored in bytes, whereas for non-embedded
273  * bp's they are stored in units of SPA_MINBLOCKSHIFT.
274  * Generally, the generic BP_GET_*() macros can be used on embedded BP's.
275  * The B, D, X, lvl, type, and comp fields are stored the same as with normal
276  * BP's so the BP_SET_* macros can be used with them.  etype, PSIZE, LSIZE must
277  * be set with the BPE_SET_* macros.  BP_SET_EMBEDDED() should be called before
278  * other macros, as they assert that they are only used on BP's of the correct
279  * "embedded-ness".
280  */
281 
282 #define	BPE_GET_ETYPE(bp)	\
283 	(ASSERT(BP_IS_EMBEDDED(bp)), \
284 	BF64_GET((bp)->blk_prop, 40, 8))
285 #define	BPE_SET_ETYPE(bp, t)	do { \
286 	ASSERT(BP_IS_EMBEDDED(bp)); \
287 	BF64_SET((bp)->blk_prop, 40, 8, t); \
288 _NOTE(CONSTCOND) } while (0)
289 
290 #define	BPE_GET_LSIZE(bp)	\
291 	(ASSERT(BP_IS_EMBEDDED(bp)), \
292 	BF64_GET_SB((bp)->blk_prop, 0, 25, 0, 1))
293 #define	BPE_SET_LSIZE(bp, x)	do { \
294 	ASSERT(BP_IS_EMBEDDED(bp)); \
295 	BF64_SET_SB((bp)->blk_prop, 0, 25, 0, 1, x); \
296 _NOTE(CONSTCOND) } while (0)
297 
298 #define	BPE_GET_PSIZE(bp)	\
299 	(ASSERT(BP_IS_EMBEDDED(bp)), \
300 	BF64_GET_SB((bp)->blk_prop, 25, 7, 0, 1))
301 #define	BPE_SET_PSIZE(bp, x)	do { \
302 	ASSERT(BP_IS_EMBEDDED(bp)); \
303 	BF64_SET_SB((bp)->blk_prop, 25, 7, 0, 1, x); \
304 _NOTE(CONSTCOND) } while (0)
305 
306 typedef enum bp_embedded_type {
307 	BP_EMBEDDED_TYPE_DATA,
308 	BP_EMBEDDED_TYPE_RESERVED, /* Reserved for an unintegrated feature. */
309 	NUM_BP_EMBEDDED_TYPES = BP_EMBEDDED_TYPE_RESERVED
310 } bp_embedded_type_t;
311 
312 #define	BPE_NUM_WORDS 14
313 #define	BPE_PAYLOAD_SIZE (BPE_NUM_WORDS * sizeof (uint64_t))
314 #define	BPE_IS_PAYLOADWORD(bp, wp) \
315 	((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)
316 
317 #define	SPA_BLKPTRSHIFT	7		/* blkptr_t is 128 bytes	*/
318 #define	SPA_DVAS_PER_BP	3		/* Number of DVAs in a bp	*/
319 
320 /*
321  * A block is a hole when it has either 1) never been written to, or
322  * 2) is zero-filled. In both cases, ZFS can return all zeroes for all reads
323  * without physically allocating disk space. Holes are represented in the
324  * blkptr_t structure by zeroed blk_dva. Correct checking for holes is
325  * done through the BP_IS_HOLE macro. For holes, the logical size, level,
326  * DMU object type, and birth times are all also stored for holes that
327  * were written to at some point (i.e. were punched after having been filled).
328  */
329 typedef struct blkptr {
330 	dva_t		blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
331 	uint64_t	blk_prop;	/* size, compression, type, etc	    */
332 	uint64_t	blk_pad[2];	/* Extra space for the future	    */
333 	uint64_t	blk_phys_birth;	/* txg when block was allocated	    */
334 	uint64_t	blk_birth;	/* transaction group at birth	    */
335 	uint64_t	blk_fill;	/* fill count			    */
336 	zio_cksum_t	blk_cksum;	/* 256-bit checksum		    */
337 } blkptr_t;
338 
339 /*
340  * Macros to get and set fields in a bp or DVA.
341  */
342 #define	DVA_GET_ASIZE(dva)	\
343 	BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0)
344 #define	DVA_SET_ASIZE(dva, x)	\
345 	BF64_SET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, \
346 	SPA_MINBLOCKSHIFT, 0, x)
347 
348 #define	DVA_GET_GRID(dva)	BF64_GET((dva)->dva_word[0], 24, 8)
349 #define	DVA_SET_GRID(dva, x)	BF64_SET((dva)->dva_word[0], 24, 8, x)
350 
351 #define	DVA_GET_VDEV(dva)	BF64_GET((dva)->dva_word[0], 32, 32)
352 #define	DVA_SET_VDEV(dva, x)	BF64_SET((dva)->dva_word[0], 32, 32, x)
353 
354 #define	DVA_GET_OFFSET(dva)	\
355 	BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
356 #define	DVA_SET_OFFSET(dva, x)	\
357 	BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)
358 
359 #define	DVA_GET_GANG(dva)	BF64_GET((dva)->dva_word[1], 63, 1)
360 #define	DVA_SET_GANG(dva, x)	BF64_SET((dva)->dva_word[1], 63, 1, x)
361 
362 #define	BP_GET_LSIZE(bp)	\
363 	(BP_IS_EMBEDDED(bp) ?	\
364 	(BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA ? BPE_GET_LSIZE(bp) : 0): \
365 	BF64_GET_SB((bp)->blk_prop, 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1))
366 #define	BP_SET_LSIZE(bp, x)	do { \
367 	ASSERT(!BP_IS_EMBEDDED(bp)); \
368 	BF64_SET_SB((bp)->blk_prop, \
369 	    0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
370 _NOTE(CONSTCOND) } while (0)
371 
372 #define	BP_GET_PSIZE(bp)	\
373 	(BP_IS_EMBEDDED(bp) ? 0 : \
374 	BF64_GET_SB((bp)->blk_prop, 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1))
375 #define	BP_SET_PSIZE(bp, x)	do { \
376 	ASSERT(!BP_IS_EMBEDDED(bp)); \
377 	BF64_SET_SB((bp)->blk_prop, \
378 	    16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
379 _NOTE(CONSTCOND) } while (0)
380 
381 #define	BP_GET_COMPRESS(bp)		\
382 	BF64_GET((bp)->blk_prop, 32, SPA_COMPRESSBITS)
383 #define	BP_SET_COMPRESS(bp, x)		\
384 	BF64_SET((bp)->blk_prop, 32, SPA_COMPRESSBITS, x)
385 
386 #define	BP_IS_EMBEDDED(bp)		BF64_GET((bp)->blk_prop, 39, 1)
387 #define	BP_SET_EMBEDDED(bp, x)		BF64_SET((bp)->blk_prop, 39, 1, x)
388 
389 #define	BP_GET_CHECKSUM(bp)		\
390 	(BP_IS_EMBEDDED(bp) ? ZIO_CHECKSUM_OFF : \
391 	BF64_GET((bp)->blk_prop, 40, 8))
392 #define	BP_SET_CHECKSUM(bp, x)		do { \
393 	ASSERT(!BP_IS_EMBEDDED(bp)); \
394 	BF64_SET((bp)->blk_prop, 40, 8, x); \
395 _NOTE(CONSTCOND) } while (0)
396 
397 #define	BP_GET_TYPE(bp)			BF64_GET((bp)->blk_prop, 48, 8)
398 #define	BP_SET_TYPE(bp, x)		BF64_SET((bp)->blk_prop, 48, 8, x)
399 
400 #define	BP_GET_LEVEL(bp)		BF64_GET((bp)->blk_prop, 56, 5)
401 #define	BP_SET_LEVEL(bp, x)		BF64_SET((bp)->blk_prop, 56, 5, x)
402 
403 #define	BP_GET_DEDUP(bp)		BF64_GET((bp)->blk_prop, 62, 1)
404 #define	BP_SET_DEDUP(bp, x)		BF64_SET((bp)->blk_prop, 62, 1, x)
405 
406 #define	BP_GET_BYTEORDER(bp)		BF64_GET((bp)->blk_prop, 63, 1)
407 #define	BP_SET_BYTEORDER(bp, x)		BF64_SET((bp)->blk_prop, 63, 1, x)
408 
409 #define	BP_PHYSICAL_BIRTH(bp)		\
410 	(BP_IS_EMBEDDED(bp) ? 0 : \
411 	(bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)
412 
413 #define	BP_SET_BIRTH(bp, logical, physical)	\
414 {						\
415 	ASSERT(!BP_IS_EMBEDDED(bp));		\
416 	(bp)->blk_birth = (logical);		\
417 	(bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \
418 }
419 
420 #define	BP_GET_FILL(bp) (BP_IS_EMBEDDED(bp) ? 1 : (bp)->blk_fill)
421 
422 #define	BP_GET_ASIZE(bp)	\
423 	(BP_IS_EMBEDDED(bp) ? 0 : \
424 	DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
425 	DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
426 	DVA_GET_ASIZE(&(bp)->blk_dva[2]))
427 
428 #define	BP_GET_UCSIZE(bp) \
429 	((BP_GET_LEVEL(bp) > 0 || DMU_OT_IS_METADATA(BP_GET_TYPE(bp))) ? \
430 	BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp))
431 
432 #define	BP_GET_NDVAS(bp)	\
433 	(BP_IS_EMBEDDED(bp) ? 0 : \
434 	!!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
435 	!!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
436 	!!DVA_GET_ASIZE(&(bp)->blk_dva[2]))
437 
438 #define	BP_COUNT_GANG(bp)	\
439 	(BP_IS_EMBEDDED(bp) ? 0 : \
440 	(DVA_GET_GANG(&(bp)->blk_dva[0]) + \
441 	DVA_GET_GANG(&(bp)->blk_dva[1]) + \
442 	DVA_GET_GANG(&(bp)->blk_dva[2])))
443 
444 #define	DVA_EQUAL(dva1, dva2)	\
445 	((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
446 	(dva1)->dva_word[0] == (dva2)->dva_word[0])
447 
448 #define	BP_EQUAL(bp1, bp2)	\
449 	(BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) &&	\
450 	(bp1)->blk_birth == (bp2)->blk_birth &&			\
451 	DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) &&	\
452 	DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) &&	\
453 	DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2]))
454 
455 #define	ZIO_CHECKSUM_EQUAL(zc1, zc2) \
456 	(0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
457 	((zc1).zc_word[1] - (zc2).zc_word[1]) | \
458 	((zc1).zc_word[2] - (zc2).zc_word[2]) | \
459 	((zc1).zc_word[3] - (zc2).zc_word[3])))
460 
461 #define	ZIO_CHECKSUM_IS_ZERO(zc) \
462 	(0 == ((zc)->zc_word[0] | (zc)->zc_word[1] | \
463 	(zc)->zc_word[2] | (zc)->zc_word[3]))
464 
465 #define	ZIO_CHECKSUM_BSWAP(zcp)					\
466 {								\
467 	(zcp)->zc_word[0] = BSWAP_64((zcp)->zc_word[0]);	\
468 	(zcp)->zc_word[1] = BSWAP_64((zcp)->zc_word[1]);	\
469 	(zcp)->zc_word[2] = BSWAP_64((zcp)->zc_word[2]);	\
470 	(zcp)->zc_word[3] = BSWAP_64((zcp)->zc_word[3]);	\
471 }
472 
473 
474 #define	DVA_IS_VALID(dva)	(DVA_GET_ASIZE(dva) != 0)
475 
476 #define	ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3)	\
477 {						\
478 	(zcp)->zc_word[0] = w0;			\
479 	(zcp)->zc_word[1] = w1;			\
480 	(zcp)->zc_word[2] = w2;			\
481 	(zcp)->zc_word[3] = w3;			\
482 }
483 
484 #define	BP_IDENTITY(bp)		(ASSERT(!BP_IS_EMBEDDED(bp)), &(bp)->blk_dva[0])
485 #define	BP_IS_GANG(bp)		\
486 	(BP_IS_EMBEDDED(bp) ? B_FALSE : DVA_GET_GANG(BP_IDENTITY(bp)))
487 #define	DVA_IS_EMPTY(dva)	((dva)->dva_word[0] == 0ULL &&	\
488 				(dva)->dva_word[1] == 0ULL)
489 #define	BP_IS_HOLE(bp) \
490 	(!BP_IS_EMBEDDED(bp) && DVA_IS_EMPTY(BP_IDENTITY(bp)))
491 
492 /* BP_IS_RAIDZ(bp) assumes no block compression */
493 #define	BP_IS_RAIDZ(bp)		(DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \
494 				BP_GET_PSIZE(bp))
495 
496 #define	BP_ZERO(bp)				\
497 {						\
498 	(bp)->blk_dva[0].dva_word[0] = 0;	\
499 	(bp)->blk_dva[0].dva_word[1] = 0;	\
500 	(bp)->blk_dva[1].dva_word[0] = 0;	\
501 	(bp)->blk_dva[1].dva_word[1] = 0;	\
502 	(bp)->blk_dva[2].dva_word[0] = 0;	\
503 	(bp)->blk_dva[2].dva_word[1] = 0;	\
504 	(bp)->blk_prop = 0;			\
505 	(bp)->blk_pad[0] = 0;			\
506 	(bp)->blk_pad[1] = 0;			\
507 	(bp)->blk_phys_birth = 0;		\
508 	(bp)->blk_birth = 0;			\
509 	(bp)->blk_fill = 0;			\
510 	ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0);	\
511 }
512 
513 #ifdef _BIG_ENDIAN
514 #define	ZFS_HOST_BYTEORDER	(0ULL)
515 #else
516 #define	ZFS_HOST_BYTEORDER	(1ULL)
517 #endif
518 
519 #define	BP_SHOULD_BYTESWAP(bp)	(BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)
520 
521 #define	BP_SPRINTF_LEN	320
522 
523 /*
524  * This macro allows code sharing between zfs, libzpool, and mdb.
525  * 'func' is either snprintf() or mdb_snprintf().
526  * 'ws' (whitespace) can be ' ' for single-line format, '\n' for multi-line.
527  */
528 #define	SNPRINTF_BLKPTR(func, ws, buf, size, bp, type, checksum, compress) \
529 {									\
530 	static const char *copyname[] =					\
531 	    { "zero", "single", "double", "triple" };			\
532 	int len = 0;							\
533 	int copies = 0;							\
534 									\
535 	if (bp == NULL) {						\
536 		len += func(buf + len, size - len, "<NULL>");		\
537 	} else if (BP_IS_HOLE(bp)) {					\
538 		len += func(buf + len, size - len,			\
539 		    "HOLE [L%llu %s] "					\
540 		    "size=%llxL birth=%lluL",				\
541 		    (u_longlong_t)BP_GET_LEVEL(bp),			\
542 		    type,						\
543 		    (u_longlong_t)BP_GET_LSIZE(bp),			\
544 		    (u_longlong_t)bp->blk_birth);			\
545 	} else if (BP_IS_EMBEDDED(bp)) {				\
546 		len = func(buf + len, size - len,			\
547 		    "EMBEDDED [L%llu %s] et=%u %s "			\
548 		    "size=%llxL/%llxP birth=%lluL",			\
549 		    (u_longlong_t)BP_GET_LEVEL(bp),			\
550 		    type,						\
551 		    (int)BPE_GET_ETYPE(bp),				\
552 		    compress,						\
553 		    (u_longlong_t)BPE_GET_LSIZE(bp),			\
554 		    (u_longlong_t)BPE_GET_PSIZE(bp),			\
555 		    (u_longlong_t)bp->blk_birth);			\
556 	} else {							\
557 		for (int d = 0; d < BP_GET_NDVAS(bp); d++) {		\
558 			const dva_t *dva = &bp->blk_dva[d];		\
559 			if (DVA_IS_VALID(dva))				\
560 				copies++;				\
561 			len += func(buf + len, size - len,		\
562 			    "DVA[%d]=<%llu:%llx:%llx>%c", d,		\
563 			    (u_longlong_t)DVA_GET_VDEV(dva),		\
564 			    (u_longlong_t)DVA_GET_OFFSET(dva),		\
565 			    (u_longlong_t)DVA_GET_ASIZE(dva),		\
566 			    ws);					\
567 		}							\
568 		if (BP_IS_GANG(bp) &&					\
569 		    DVA_GET_ASIZE(&bp->blk_dva[2]) <=			\
570 		    DVA_GET_ASIZE(&bp->blk_dva[1]) / 2)			\
571 			copies--;					\
572 		len += func(buf + len, size - len,			\
573 		    "[L%llu %s] %s %s %s %s %s %s%c"			\
574 		    "size=%llxL/%llxP birth=%lluL/%lluP fill=%llu%c"	\
575 		    "cksum=%llx:%llx:%llx:%llx",			\
576 		    (u_longlong_t)BP_GET_LEVEL(bp),			\
577 		    type,						\
578 		    checksum,						\
579 		    compress,						\
580 		    BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE",		\
581 		    BP_IS_GANG(bp) ? "gang" : "contiguous",		\
582 		    BP_GET_DEDUP(bp) ? "dedup" : "unique",		\
583 		    copyname[copies],					\
584 		    ws,							\
585 		    (u_longlong_t)BP_GET_LSIZE(bp),			\
586 		    (u_longlong_t)BP_GET_PSIZE(bp),			\
587 		    (u_longlong_t)bp->blk_birth,			\
588 		    (u_longlong_t)BP_PHYSICAL_BIRTH(bp),		\
589 		    (u_longlong_t)BP_GET_FILL(bp),			\
590 		    ws,							\
591 		    (u_longlong_t)bp->blk_cksum.zc_word[0],		\
592 		    (u_longlong_t)bp->blk_cksum.zc_word[1],		\
593 		    (u_longlong_t)bp->blk_cksum.zc_word[2],		\
594 		    (u_longlong_t)bp->blk_cksum.zc_word[3]);		\
595 	}								\
596 	ASSERT(len < size);						\
597 }
598 
599 #define	BP_GET_BUFC_TYPE(bp)						\
600 	(((BP_GET_LEVEL(bp) > 0) || (DMU_OT_IS_METADATA(BP_GET_TYPE(bp)))) ? \
601 	ARC_BUFC_METADATA : ARC_BUFC_DATA)
602 
603 typedef enum spa_import_type {
604 	SPA_IMPORT_EXISTING,
605 	SPA_IMPORT_ASSEMBLE
606 } spa_import_type_t;
607 
608 /* state manipulation functions */
609 extern int spa_open(const char *pool, spa_t **, void *tag);
610 extern int spa_open_rewind(const char *pool, spa_t **, void *tag,
611     nvlist_t *policy, nvlist_t **config);
612 extern int spa_get_stats(const char *pool, nvlist_t **config, char *altroot,
613     size_t buflen);
614 extern int spa_create(const char *pool, nvlist_t *config, nvlist_t *props,
615     nvlist_t *zplprops);
616 extern int spa_import_rootpool(char *devpath, char *devid);
617 extern int spa_import(const char *pool, nvlist_t *config, nvlist_t *props,
618     uint64_t flags);
619 extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
620 extern int spa_destroy(char *pool);
621 extern int spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
622     boolean_t hardforce);
623 extern int spa_reset(char *pool);
624 extern void spa_async_request(spa_t *spa, int flag);
625 extern void spa_async_unrequest(spa_t *spa, int flag);
626 extern void spa_async_suspend(spa_t *spa);
627 extern void spa_async_resume(spa_t *spa);
628 extern spa_t *spa_inject_addref(char *pool);
629 extern void spa_inject_delref(spa_t *spa);
630 extern void spa_scan_stat_init(spa_t *spa);
631 extern int spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps);
632 
633 #define	SPA_ASYNC_CONFIG_UPDATE	0x01
634 #define	SPA_ASYNC_REMOVE	0x02
635 #define	SPA_ASYNC_PROBE		0x04
636 #define	SPA_ASYNC_RESILVER_DONE	0x08
637 #define	SPA_ASYNC_RESILVER	0x10
638 #define	SPA_ASYNC_AUTOEXPAND	0x20
639 #define	SPA_ASYNC_REMOVE_DONE	0x40
640 #define	SPA_ASYNC_REMOVE_STOP	0x80
641 
642 /*
643  * Controls the behavior of spa_vdev_remove().
644  */
645 #define	SPA_REMOVE_UNSPARE	0x01
646 #define	SPA_REMOVE_DONE		0x02
647 
648 /* device manipulation */
649 extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot);
650 extern int spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot,
651     int replacing);
652 extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid,
653     int replace_done);
654 extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
655 extern boolean_t spa_vdev_remove_active(spa_t *spa);
656 extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath);
657 extern int spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru);
658 extern int spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config,
659     nvlist_t *props, boolean_t exp);
660 
661 /* spare state (which is global across all pools) */
662 extern void spa_spare_add(vdev_t *vd);
663 extern void spa_spare_remove(vdev_t *vd);
664 extern boolean_t spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt);
665 extern void spa_spare_activate(vdev_t *vd);
666 
667 /* L2ARC state (which is global across all pools) */
668 extern void spa_l2cache_add(vdev_t *vd);
669 extern void spa_l2cache_remove(vdev_t *vd);
670 extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
671 extern void spa_l2cache_activate(vdev_t *vd);
672 extern void spa_l2cache_drop(spa_t *spa);
673 
674 /* scanning */
675 extern int spa_scan(spa_t *spa, pool_scan_func_t func);
676 extern int spa_scan_stop(spa_t *spa);
677 
678 /* spa syncing */
679 extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
680 extern void spa_sync_allpools(void);
681 
682 /* spa namespace global mutex */
683 extern kmutex_t spa_namespace_lock;
684 
685 /*
686  * SPA configuration functions in spa_config.c
687  */
688 
689 #define	SPA_CONFIG_UPDATE_POOL	0
690 #define	SPA_CONFIG_UPDATE_VDEVS	1
691 
692 extern void spa_config_sync(spa_t *, boolean_t, boolean_t);
693 extern void spa_config_load(void);
694 extern nvlist_t *spa_all_configs(uint64_t *);
695 extern void spa_config_set(spa_t *spa, nvlist_t *config);
696 extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
697     int getstats);
698 extern void spa_config_update(spa_t *spa, int what);
699 
700 /*
701  * Miscellaneous SPA routines in spa_misc.c
702  */
703 
704 /* Namespace manipulation */
705 extern spa_t *spa_lookup(const char *name);
706 extern spa_t *spa_add(const char *name, nvlist_t *config, const char *altroot);
707 extern void spa_remove(spa_t *spa);
708 extern spa_t *spa_next(spa_t *prev);
709 
710 /* Refcount functions */
711 extern void spa_open_ref(spa_t *spa, void *tag);
712 extern void spa_close(spa_t *spa, void *tag);
713 extern void spa_async_close(spa_t *spa, void *tag);
714 extern boolean_t spa_refcount_zero(spa_t *spa);
715 
716 #define	SCL_NONE	0x00
717 #define	SCL_CONFIG	0x01
718 #define	SCL_STATE	0x02
719 #define	SCL_L2ARC	0x04		/* hack until L2ARC 2.0 */
720 #define	SCL_ALLOC	0x08
721 #define	SCL_ZIO		0x10
722 #define	SCL_FREE	0x20
723 #define	SCL_VDEV	0x40
724 #define	SCL_LOCKS	7
725 #define	SCL_ALL		((1 << SCL_LOCKS) - 1)
726 #define	SCL_STATE_ALL	(SCL_STATE | SCL_L2ARC | SCL_ZIO)
727 
728 /* Pool configuration locks */
729 extern int spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw);
730 extern void spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw);
731 extern void spa_config_exit(spa_t *spa, int locks, void *tag);
732 extern int spa_config_held(spa_t *spa, int locks, krw_t rw);
733 
734 /* Pool vdev add/remove lock */
735 extern uint64_t spa_vdev_enter(spa_t *spa);
736 extern uint64_t spa_vdev_config_enter(spa_t *spa);
737 extern void spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg,
738     int error, char *tag);
739 extern int spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error);
740 
741 /* Pool vdev state change lock */
742 extern void spa_vdev_state_enter(spa_t *spa, int oplock);
743 extern int spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error);
744 
745 /* Log state */
746 typedef enum spa_log_state {
747 	SPA_LOG_UNKNOWN = 0,	/* unknown log state */
748 	SPA_LOG_MISSING,	/* missing log(s) */
749 	SPA_LOG_CLEAR,		/* clear the log(s) */
750 	SPA_LOG_GOOD,		/* log(s) are good */
751 } spa_log_state_t;
752 
753 extern spa_log_state_t spa_get_log_state(spa_t *spa);
754 extern void spa_set_log_state(spa_t *spa, spa_log_state_t state);
755 extern int spa_offline_log(spa_t *spa);
756 
757 /* Log claim callback */
758 extern void spa_claim_notify(zio_t *zio);
759 
760 /* Accessor functions */
761 extern boolean_t spa_shutting_down(spa_t *spa);
762 extern struct dsl_pool *spa_get_dsl(spa_t *spa);
763 extern boolean_t spa_is_initializing(spa_t *spa);
764 extern blkptr_t *spa_get_rootblkptr(spa_t *spa);
765 extern void spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp);
766 extern void spa_altroot(spa_t *, char *, size_t);
767 extern int spa_sync_pass(spa_t *spa);
768 extern char *spa_name(spa_t *spa);
769 extern uint64_t spa_guid(spa_t *spa);
770 extern uint64_t spa_load_guid(spa_t *spa);
771 extern uint64_t spa_last_synced_txg(spa_t *spa);
772 extern uint64_t spa_first_txg(spa_t *spa);
773 extern uint64_t spa_syncing_txg(spa_t *spa);
774 extern uint64_t spa_version(spa_t *spa);
775 extern pool_state_t spa_state(spa_t *spa);
776 extern spa_load_state_t spa_load_state(spa_t *spa);
777 extern uint64_t spa_freeze_txg(spa_t *spa);
778 extern uint64_t spa_get_worst_case_asize(spa_t *spa, uint64_t lsize);
779 extern uint64_t spa_get_dspace(spa_t *spa);
780 extern uint64_t spa_get_slop_space(spa_t *spa);
781 extern void spa_update_dspace(spa_t *spa);
782 extern uint64_t spa_version(spa_t *spa);
783 extern boolean_t spa_deflate(spa_t *spa);
784 extern metaslab_class_t *spa_normal_class(spa_t *spa);
785 extern metaslab_class_t *spa_log_class(spa_t *spa);
786 extern void spa_evicting_os_register(spa_t *, objset_t *os);
787 extern void spa_evicting_os_deregister(spa_t *, objset_t *os);
788 extern void spa_evicting_os_wait(spa_t *spa);
789 extern int spa_max_replication(spa_t *spa);
790 extern int spa_prev_software_version(spa_t *spa);
791 extern int spa_busy(void);
792 extern uint8_t spa_get_failmode(spa_t *spa);
793 extern boolean_t spa_suspended(spa_t *spa);
794 extern uint64_t spa_bootfs(spa_t *spa);
795 extern uint64_t spa_delegation(spa_t *spa);
796 extern objset_t *spa_meta_objset(spa_t *spa);
797 extern uint64_t spa_deadman_synctime(spa_t *spa);
798 
799 /* Miscellaneous support routines */
800 extern void spa_activate_mos_feature(spa_t *spa, const char *feature,
801     dmu_tx_t *tx);
802 extern void spa_deactivate_mos_feature(spa_t *spa, const char *feature);
803 extern int spa_rename(const char *oldname, const char *newname);
804 extern spa_t *spa_by_guid(uint64_t pool_guid, uint64_t device_guid);
805 extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
806 extern char *spa_strdup(const char *);
807 extern void spa_strfree(char *);
808 extern uint64_t spa_get_random(uint64_t range);
809 extern uint64_t spa_generate_guid(spa_t *spa);
810 extern void snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp);
811 extern void spa_freeze(spa_t *spa);
812 extern int spa_change_guid(spa_t *spa);
813 extern void spa_upgrade(spa_t *spa, uint64_t version);
814 extern void spa_evict_all(void);
815 extern vdev_t *spa_lookup_by_guid(spa_t *spa, uint64_t guid,
816     boolean_t l2cache);
817 extern boolean_t spa_has_spare(spa_t *, uint64_t guid);
818 extern uint64_t dva_get_dsize_sync(spa_t *spa, const dva_t *dva);
819 extern uint64_t bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp);
820 extern uint64_t bp_get_dsize(spa_t *spa, const blkptr_t *bp);
821 extern boolean_t spa_has_slogs(spa_t *spa);
822 extern boolean_t spa_is_root(spa_t *spa);
823 extern boolean_t spa_writeable(spa_t *spa);
824 extern boolean_t spa_has_pending_synctask(spa_t *spa);
825 extern int spa_maxblocksize(spa_t *spa);
826 extern void zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp);
827 
828 extern int spa_mode(spa_t *spa);
829 extern uint64_t strtonum(const char *str, char **nptr);
830 
831 extern char *spa_his_ievent_table[];
832 
833 extern void spa_history_create_obj(spa_t *spa, dmu_tx_t *tx);
834 extern int spa_history_get(spa_t *spa, uint64_t *offset, uint64_t *len_read,
835     char *his_buf);
836 extern int spa_history_log(spa_t *spa, const char *his_buf);
837 extern int spa_history_log_nvl(spa_t *spa, nvlist_t *nvl);
838 extern void spa_history_log_version(spa_t *spa, const char *operation);
839 extern void spa_history_log_internal(spa_t *spa, const char *operation,
840     dmu_tx_t *tx, const char *fmt, ...);
841 extern void spa_history_log_internal_ds(struct dsl_dataset *ds, const char *op,
842     dmu_tx_t *tx, const char *fmt, ...);
843 extern void spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
844     dmu_tx_t *tx, const char *fmt, ...);
845 
846 /* error handling */
847 struct zbookmark_phys;
848 extern void spa_log_error(spa_t *spa, zio_t *zio);
849 extern void zfs_ereport_post(const char *class, spa_t *spa, vdev_t *vd,
850     zio_t *zio, uint64_t stateoroffset, uint64_t length);
851 extern void zfs_post_remove(spa_t *spa, vdev_t *vd);
852 extern void zfs_post_state_change(spa_t *spa, vdev_t *vd);
853 extern void zfs_post_autoreplace(spa_t *spa, vdev_t *vd);
854 extern uint64_t spa_get_errlog_size(spa_t *spa);
855 extern int spa_get_errlog(spa_t *spa, void *uaddr, size_t *count);
856 extern void spa_errlog_rotate(spa_t *spa);
857 extern void spa_errlog_drain(spa_t *spa);
858 extern void spa_errlog_sync(spa_t *spa, uint64_t txg);
859 extern void spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub);
860 
861 /* vdev cache */
862 extern void vdev_cache_stat_init(void);
863 extern void vdev_cache_stat_fini(void);
864 
865 /* Initialization and termination */
866 extern void spa_init(int flags);
867 extern void spa_fini(void);
868 extern void spa_boot_init();
869 
870 /* properties */
871 extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
872 extern int spa_prop_get(spa_t *spa, nvlist_t **nvp);
873 extern void spa_prop_clear_bootfs(spa_t *spa, uint64_t obj, dmu_tx_t *tx);
874 extern void spa_configfile_set(spa_t *, nvlist_t *, boolean_t);
875 
876 /* asynchronous event notification */
877 extern void spa_event_notify(spa_t *spa, vdev_t *vdev, const char *name);
878 
879 #ifdef ZFS_DEBUG
880 #define	dprintf_bp(bp, fmt, ...) do {				\
881 	if (zfs_flags & ZFS_DEBUG_DPRINTF) {			\
882 	char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP);	\
883 	snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp));	\
884 	dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf);		\
885 	kmem_free(__blkbuf, BP_SPRINTF_LEN);			\
886 	} \
887 _NOTE(CONSTCOND) } while (0)
888 #else
889 #define	dprintf_bp(bp, fmt, ...)
890 #endif
891 
892 extern boolean_t spa_debug_enabled(spa_t *spa);
893 #define	spa_dbgmsg(spa, ...)			\
894 {						\
895 	if (spa_debug_enabled(spa))		\
896 		zfs_dbgmsg(__VA_ARGS__);	\
897 }
898 
899 extern int spa_mode_global;			/* mode, e.g. FREAD | FWRITE */
900 
901 #ifdef	__cplusplus
902 }
903 #endif
904 
905 #endif	/* _SYS_SPA_H */
906