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9166 zfs storage pool checkpoint
[unleashed.git] / usr / src / uts / common / fs / zfs / sys / spa.h
blob936d80538912720de6164a81e11dcef1d17d7a94
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, 2018 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 * Copyright 2017 Joyent, Inc.
29 * Copyright (c) 2017 Datto Inc.
30 */
31
32 #ifndef _SYS_SPA_H
33 #define _SYS_SPA_H
34
35 #include <sys/avl.h>
36 #include <sys/zfs_context.h>
37 #include <sys/nvpair.h>
38 #include <sys/sysevent.h>
39 #include <sys/sysmacros.h>
40 #include <sys/types.h>
41 #include <sys/fs/zfs.h>
42 #include <sys/dmu.h>
43
44 #ifdef __cplusplus
45 extern "C" {
46 #endif
47
48 /*
49 * Forward references that lots of things need.
50 */
51 typedef struct spa spa_t;
52 typedef struct vdev vdev_t;
53 typedef struct metaslab metaslab_t;
54 typedef struct metaslab_group metaslab_group_t;
55 typedef struct metaslab_class metaslab_class_t;
56 typedef struct zio zio_t;
57 typedef struct zilog zilog_t;
58 typedef struct spa_aux_vdev spa_aux_vdev_t;
59 typedef struct ddt ddt_t;
60 typedef struct ddt_entry ddt_entry_t;
61 struct dsl_pool;
62 struct dsl_dataset;
63
64 /*
65 * General-purpose 32-bit and 64-bit bitfield encodings.
66 */
67 #define BF32_DECODE(x, low, len) P2PHASE((x) >> (low), 1U << (len))
68 #define BF64_DECODE(x, low, len) P2PHASE((x) >> (low), 1ULL << (len))
69 #define BF32_ENCODE(x, low, len) (P2PHASE((x), 1U << (len)) << (low))
70 #define BF64_ENCODE(x, low, len) (P2PHASE((x), 1ULL << (len)) << (low))
71
72 #define BF32_GET(x, low, len) BF32_DECODE(x, low, len)
73 #define BF64_GET(x, low, len) BF64_DECODE(x, low, len)
74
75 #define BF32_SET(x, low, len, val) do { \
76 ASSERT3U(val, <, 1U << (len)); \
77 ASSERT3U(low + len, <=, 32); \
78 (x) ^= BF32_ENCODE((x >> low) ^ (val), low, len); \
79 _NOTE(CONSTCOND) } while (0)
80
81 #define BF64_SET(x, low, len, val) do { \
82 ASSERT3U(val, <, 1ULL << (len)); \
83 ASSERT3U(low + len, <=, 64); \
84 ((x) ^= BF64_ENCODE((x >> low) ^ (val), low, len)); \
85 _NOTE(CONSTCOND) } while (0)
86
87 #define BF32_GET_SB(x, low, len, shift, bias) \
88 ((BF32_GET(x, low, len) + (bias)) << (shift))
89 #define BF64_GET_SB(x, low, len, shift, bias) \
90 ((BF64_GET(x, low, len) + (bias)) << (shift))
91
92 #define BF32_SET_SB(x, low, len, shift, bias, val) do { \
93 ASSERT(IS_P2ALIGNED(val, 1U << shift)); \
94 ASSERT3S((val) >> (shift), >=, bias); \
95 BF32_SET(x, low, len, ((val) >> (shift)) - (bias)); \
96 _NOTE(CONSTCOND) } while (0)
97 #define BF64_SET_SB(x, low, len, shift, bias, val) do { \
98 ASSERT(IS_P2ALIGNED(val, 1ULL << shift)); \
99 ASSERT3S((val) >> (shift), >=, bias); \
100 BF64_SET(x, low, len, ((val) >> (shift)) - (bias)); \
101 _NOTE(CONSTCOND) } while (0)
102
103 /*
104 * We currently support block sizes from 512 bytes to 16MB.
105 * The benefits of larger blocks, and thus larger IO, need to be weighed
106 * against the cost of COWing a giant block to modify one byte, and the
107 * large latency of reading or writing a large block.
108 *
109 * Note that although blocks up to 16MB are supported, the recordsize
110 * property can not be set larger than zfs_max_recordsize (default 1MB).
111 * See the comment near zfs_max_recordsize in dsl_dataset.c for details.
112 *
113 * Note that although the LSIZE field of the blkptr_t can store sizes up
114 * to 32MB, the dnode's dn_datablkszsec can only store sizes up to
115 * 32MB - 512 bytes. Therefore, we limit SPA_MAXBLOCKSIZE to 16MB.
116 */
117 #define SPA_MINBLOCKSHIFT 9
118 #define SPA_OLD_MAXBLOCKSHIFT 17
119 #define SPA_MAXBLOCKSHIFT 24
120 #define SPA_MINBLOCKSIZE (1ULL << SPA_MINBLOCKSHIFT)
121 #define SPA_OLD_MAXBLOCKSIZE (1ULL << SPA_OLD_MAXBLOCKSHIFT)
122 #define SPA_MAXBLOCKSIZE (1ULL << SPA_MAXBLOCKSHIFT)
123
124 /*
125 * Size of block to hold the configuration data (a packed nvlist)
126 */
127 #define SPA_CONFIG_BLOCKSIZE (1ULL << 14)
128
129 /*
130 * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
131 * The ASIZE encoding should be at least 64 times larger (6 more bits)
132 * to support up to 4-way RAID-Z mirror mode with worst-case gang block
133 * overhead, three DVAs per bp, plus one more bit in case we do anything
134 * else that expands the ASIZE.
135 */
136 #define SPA_LSIZEBITS 16 /* LSIZE up to 32M (2^16 * 512) */
137 #define SPA_PSIZEBITS 16 /* PSIZE up to 32M (2^16 * 512) */
138 #define SPA_ASIZEBITS 24 /* ASIZE up to 64 times larger */
139
140 #define SPA_COMPRESSBITS 7
141
142 /*
143 * All SPA data is represented by 128-bit data virtual addresses (DVAs).
144 * The members of the dva_t should be considered opaque outside the SPA.
145 */
146 typedef struct dva {
147 uint64_t dva_word[2];
148 } dva_t;
149
150 /*
151 * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
152 */
153 typedef struct zio_cksum {
154 uint64_t zc_word[4];
155 } zio_cksum_t;
156
157 /*
158 * Some checksums/hashes need a 256-bit initialization salt. This salt is kept
159 * secret and is suitable for use in MAC algorithms as the key.
160 */
161 typedef struct zio_cksum_salt {
162 uint8_t zcs_bytes[32];
163 } zio_cksum_salt_t;
164
165 /*
166 * Each block is described by its DVAs, time of birth, checksum, etc.
167 * The word-by-word, bit-by-bit layout of the blkptr is as follows:
168 *
169 * 64 56 48 40 32 24 16 8 0
170 * +-------+-------+-------+-------+-------+-------+-------+-------+
171 * 0 | vdev1 | GRID | ASIZE |
172 * +-------+-------+-------+-------+-------+-------+-------+-------+
173 * 1 |G| offset1 |
174 * +-------+-------+-------+-------+-------+-------+-------+-------+
175 * 2 | vdev2 | GRID | ASIZE |
176 * +-------+-------+-------+-------+-------+-------+-------+-------+
177 * 3 |G| offset2 |
178 * +-------+-------+-------+-------+-------+-------+-------+-------+
179 * 4 | vdev3 | GRID | ASIZE |
180 * +-------+-------+-------+-------+-------+-------+-------+-------+
181 * 5 |G| offset3 |
182 * +-------+-------+-------+-------+-------+-------+-------+-------+
183 * 6 |BDX|lvl| type | cksum |E| comp| PSIZE | LSIZE |
184 * +-------+-------+-------+-------+-------+-------+-------+-------+
185 * 7 | padding |
186 * +-------+-------+-------+-------+-------+-------+-------+-------+
187 * 8 | padding |
188 * +-------+-------+-------+-------+-------+-------+-------+-------+
189 * 9 | physical birth txg |
190 * +-------+-------+-------+-------+-------+-------+-------+-------+
191 * a | logical birth txg |
192 * +-------+-------+-------+-------+-------+-------+-------+-------+
193 * b | fill count |
194 * +-------+-------+-------+-------+-------+-------+-------+-------+
195 * c | checksum[0] |
196 * +-------+-------+-------+-------+-------+-------+-------+-------+
197 * d | checksum[1] |
198 * +-------+-------+-------+-------+-------+-------+-------+-------+
199 * e | checksum[2] |
200 * +-------+-------+-------+-------+-------+-------+-------+-------+
201 * f | checksum[3] |
202 * +-------+-------+-------+-------+-------+-------+-------+-------+
203 *
204 * Legend:
205 *
206 * vdev virtual device ID
207 * offset offset into virtual device
208 * LSIZE logical size
209 * PSIZE physical size (after compression)
210 * ASIZE allocated size (including RAID-Z parity and gang block headers)
211 * GRID RAID-Z layout information (reserved for future use)
212 * cksum checksum function
213 * comp compression function
214 * G gang block indicator
215 * B byteorder (endianness)
216 * D dedup
217 * X encryption (on version 30, which is not supported)
218 * E blkptr_t contains embedded data (see below)
219 * lvl level of indirection
220 * type DMU object type
221 * phys birth txg when dva[0] was written; zero if same as logical birth txg
222 * note that typically all the dva's would be written in this
223 * txg, but they could be different if they were moved by
224 * device removal.
225 * log. birth transaction group in which the block was logically born
226 * fill count number of non-zero blocks under this bp
227 * checksum[4] 256-bit checksum of the data this bp describes
228 */
229
230 /*
231 * "Embedded" blkptr_t's don't actually point to a block, instead they
232 * have a data payload embedded in the blkptr_t itself. See the comment
233 * in blkptr.c for more details.
234 *
235 * The blkptr_t is laid out as follows:
236 *
237 * 64 56 48 40 32 24 16 8 0
238 * +-------+-------+-------+-------+-------+-------+-------+-------+
239 * 0 | payload |
240 * 1 | payload |
241 * 2 | payload |
242 * 3 | payload |
243 * 4 | payload |
244 * 5 | payload |
245 * +-------+-------+-------+-------+-------+-------+-------+-------+
246 * 6 |BDX|lvl| type | etype |E| comp| PSIZE| LSIZE |
247 * +-------+-------+-------+-------+-------+-------+-------+-------+
248 * 7 | payload |
249 * 8 | payload |
250 * 9 | payload |
251 * +-------+-------+-------+-------+-------+-------+-------+-------+
252 * a | logical birth txg |
253 * +-------+-------+-------+-------+-------+-------+-------+-------+
254 * b | payload |
255 * c | payload |
256 * d | payload |
257 * e | payload |
258 * f | payload |
259 * +-------+-------+-------+-------+-------+-------+-------+-------+
260 *
261 * Legend:
262 *
263 * payload contains the embedded data
264 * B (byteorder) byteorder (endianness)
265 * D (dedup) padding (set to zero)
266 * X encryption (set to zero; see above)
267 * E (embedded) set to one
268 * lvl indirection level
269 * type DMU object type
270 * etype how to interpret embedded data (BP_EMBEDDED_TYPE_*)
271 * comp compression function of payload
272 * PSIZE size of payload after compression, in bytes
273 * LSIZE logical size of payload, in bytes
274 * note that 25 bits is enough to store the largest
275 * "normal" BP's LSIZE (2^16 * 2^9) in bytes
276 * log. birth transaction group in which the block was logically born
277 *
278 * Note that LSIZE and PSIZE are stored in bytes, whereas for non-embedded
279 * bp's they are stored in units of SPA_MINBLOCKSHIFT.
280 * Generally, the generic BP_GET_*() macros can be used on embedded BP's.
281 * The B, D, X, lvl, type, and comp fields are stored the same as with normal
282 * BP's so the BP_SET_* macros can be used with them. etype, PSIZE, LSIZE must
283 * be set with the BPE_SET_* macros. BP_SET_EMBEDDED() should be called before
284 * other macros, as they assert that they are only used on BP's of the correct
285 * "embedded-ness".
286 */
287
288 #define BPE_GET_ETYPE(bp) \
289 (ASSERT(BP_IS_EMBEDDED(bp)), \
290 BF64_GET((bp)->blk_prop, 40, 8))
291 #define BPE_SET_ETYPE(bp, t) do { \
292 ASSERT(BP_IS_EMBEDDED(bp)); \
293 BF64_SET((bp)->blk_prop, 40, 8, t); \
294 _NOTE(CONSTCOND) } while (0)
295
296 #define BPE_GET_LSIZE(bp) \
297 (ASSERT(BP_IS_EMBEDDED(bp)), \
298 BF64_GET_SB((bp)->blk_prop, 0, 25, 0, 1))
299 #define BPE_SET_LSIZE(bp, x) do { \
300 ASSERT(BP_IS_EMBEDDED(bp)); \
301 BF64_SET_SB((bp)->blk_prop, 0, 25, 0, 1, x); \
302 _NOTE(CONSTCOND) } while (0)
303
304 #define BPE_GET_PSIZE(bp) \
305 (ASSERT(BP_IS_EMBEDDED(bp)), \
306 BF64_GET_SB((bp)->blk_prop, 25, 7, 0, 1))
307 #define BPE_SET_PSIZE(bp, x) do { \
308 ASSERT(BP_IS_EMBEDDED(bp)); \
309 BF64_SET_SB((bp)->blk_prop, 25, 7, 0, 1, x); \
310 _NOTE(CONSTCOND) } while (0)
311
312 typedef enum bp_embedded_type {
313 BP_EMBEDDED_TYPE_DATA,
314 BP_EMBEDDED_TYPE_RESERVED, /* Reserved for an unintegrated feature. */
315 NUM_BP_EMBEDDED_TYPES = BP_EMBEDDED_TYPE_RESERVED
316 } bp_embedded_type_t;
317
318 #define BPE_NUM_WORDS 14
319 #define BPE_PAYLOAD_SIZE (BPE_NUM_WORDS * sizeof (uint64_t))
320 #define BPE_IS_PAYLOADWORD(bp, wp) \
321 ((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)
322
323 #define SPA_BLKPTRSHIFT 7 /* blkptr_t is 128 bytes */
324 #define SPA_DVAS_PER_BP 3 /* Number of DVAs in a bp */
325 #define SPA_SYNC_MIN_VDEVS 3 /* min vdevs to update during sync */
326
327 /*
328 * A block is a hole when it has either 1) never been written to, or
329 * 2) is zero-filled. In both cases, ZFS can return all zeroes for all reads
330 * without physically allocating disk space. Holes are represented in the
331 * blkptr_t structure by zeroed blk_dva. Correct checking for holes is
332 * done through the BP_IS_HOLE macro. For holes, the logical size, level,
333 * DMU object type, and birth times are all also stored for holes that
334 * were written to at some point (i.e. were punched after having been filled).
335 */
336 typedef struct blkptr {
337 dva_t blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
338 uint64_t blk_prop; /* size, compression, type, etc */
339 uint64_t blk_pad[2]; /* Extra space for the future */
340 uint64_t blk_phys_birth; /* txg when block was allocated */
341 uint64_t blk_birth; /* transaction group at birth */
342 uint64_t blk_fill; /* fill count */
343 zio_cksum_t blk_cksum; /* 256-bit checksum */
344 } blkptr_t;
345
346 /*
347 * Macros to get and set fields in a bp or DVA.
348 */
349 #define DVA_GET_ASIZE(dva) \
350 BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0)
351 #define DVA_SET_ASIZE(dva, x) \
352 BF64_SET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, \
353 SPA_MINBLOCKSHIFT, 0, x)
354
355 #define DVA_GET_GRID(dva) BF64_GET((dva)->dva_word[0], 24, 8)
356 #define DVA_SET_GRID(dva, x) BF64_SET((dva)->dva_word[0], 24, 8, x)
357
358 #define DVA_GET_VDEV(dva) BF64_GET((dva)->dva_word[0], 32, 32)
359 #define DVA_SET_VDEV(dva, x) BF64_SET((dva)->dva_word[0], 32, 32, x)
360
361 #define DVA_GET_OFFSET(dva) \
362 BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
363 #define DVA_SET_OFFSET(dva, x) \
364 BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)
365
366 #define DVA_GET_GANG(dva) BF64_GET((dva)->dva_word[1], 63, 1)
367 #define DVA_SET_GANG(dva, x) BF64_SET((dva)->dva_word[1], 63, 1, x)
368
369 #define BP_GET_LSIZE(bp) \
370 (BP_IS_EMBEDDED(bp) ? \
371 (BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA ? BPE_GET_LSIZE(bp) : 0): \
372 BF64_GET_SB((bp)->blk_prop, 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1))
373 #define BP_SET_LSIZE(bp, x) do { \
374 ASSERT(!BP_IS_EMBEDDED(bp)); \
375 BF64_SET_SB((bp)->blk_prop, \
376 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
377 _NOTE(CONSTCOND) } while (0)
378
379 #define BP_GET_PSIZE(bp) \
380 (BP_IS_EMBEDDED(bp) ? 0 : \
381 BF64_GET_SB((bp)->blk_prop, 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1))
382 #define BP_SET_PSIZE(bp, x) do { \
383 ASSERT(!BP_IS_EMBEDDED(bp)); \
384 BF64_SET_SB((bp)->blk_prop, \
385 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
386 _NOTE(CONSTCOND) } while (0)
387
388 #define BP_GET_COMPRESS(bp) \
389 BF64_GET((bp)->blk_prop, 32, SPA_COMPRESSBITS)
390 #define BP_SET_COMPRESS(bp, x) \
391 BF64_SET((bp)->blk_prop, 32, SPA_COMPRESSBITS, x)
392
393 #define BP_IS_EMBEDDED(bp) BF64_GET((bp)->blk_prop, 39, 1)
394 #define BP_SET_EMBEDDED(bp, x) BF64_SET((bp)->blk_prop, 39, 1, x)
395
396 #define BP_GET_CHECKSUM(bp) \
397 (BP_IS_EMBEDDED(bp) ? ZIO_CHECKSUM_OFF : \
398 BF64_GET((bp)->blk_prop, 40, 8))
399 #define BP_SET_CHECKSUM(bp, x) do { \
400 ASSERT(!BP_IS_EMBEDDED(bp)); \
401 BF64_SET((bp)->blk_prop, 40, 8, x); \
402 _NOTE(CONSTCOND) } while (0)
403
404 #define BP_GET_TYPE(bp) BF64_GET((bp)->blk_prop, 48, 8)
405 #define BP_SET_TYPE(bp, x) BF64_SET((bp)->blk_prop, 48, 8, x)
406
407 #define BP_GET_LEVEL(bp) BF64_GET((bp)->blk_prop, 56, 5)
408 #define BP_SET_LEVEL(bp, x) BF64_SET((bp)->blk_prop, 56, 5, x)
409
410 #define BP_GET_DEDUP(bp) BF64_GET((bp)->blk_prop, 62, 1)
411 #define BP_SET_DEDUP(bp, x) BF64_SET((bp)->blk_prop, 62, 1, x)
412
413 #define BP_GET_BYTEORDER(bp) BF64_GET((bp)->blk_prop, 63, 1)
414 #define BP_SET_BYTEORDER(bp, x) BF64_SET((bp)->blk_prop, 63, 1, x)
415
416 #define BP_PHYSICAL_BIRTH(bp) \
417 (BP_IS_EMBEDDED(bp) ? 0 : \
418 (bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)
419
420 #define BP_SET_BIRTH(bp, logical, physical) \
421 { \
422 ASSERT(!BP_IS_EMBEDDED(bp)); \
423 (bp)->blk_birth = (logical); \
424 (bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \
425 }
426
427 #define BP_GET_FILL(bp) (BP_IS_EMBEDDED(bp) ? 1 : (bp)->blk_fill)
428
429 #define BP_IS_METADATA(bp) \
430 (BP_GET_LEVEL(bp) > 0 || DMU_OT_IS_METADATA(BP_GET_TYPE(bp)))
431
432 #define BP_GET_ASIZE(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_GET_UCSIZE(bp) \
439 (BP_IS_METADATA(bp) ? BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp))
440
441 #define BP_GET_NDVAS(bp) \
442 (BP_IS_EMBEDDED(bp) ? 0 : \
443 !!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
444 !!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
445 !!DVA_GET_ASIZE(&(bp)->blk_dva[2]))
446
447 #define BP_COUNT_GANG(bp) \
448 (BP_IS_EMBEDDED(bp) ? 0 : \
449 (DVA_GET_GANG(&(bp)->blk_dva[0]) + \
450 DVA_GET_GANG(&(bp)->blk_dva[1]) + \
451 DVA_GET_GANG(&(bp)->blk_dva[2])))
452
453 #define DVA_EQUAL(dva1, dva2) \
454 ((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
455 (dva1)->dva_word[0] == (dva2)->dva_word[0])
456
457 #define BP_EQUAL(bp1, bp2) \
458 (BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) && \
459 (bp1)->blk_birth == (bp2)->blk_birth && \
460 DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) && \
461 DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) && \
462 DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2]))
463
464 #define ZIO_CHECKSUM_EQUAL(zc1, zc2) \
465 (0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
466 ((zc1).zc_word[1] - (zc2).zc_word[1]) | \
467 ((zc1).zc_word[2] - (zc2).zc_word[2]) | \
468 ((zc1).zc_word[3] - (zc2).zc_word[3])))
469
470 #define ZIO_CHECKSUM_IS_ZERO(zc) \
471 (0 == ((zc)->zc_word[0] | (zc)->zc_word[1] | \
472 (zc)->zc_word[2] | (zc)->zc_word[3]))
473
474 #define ZIO_CHECKSUM_BSWAP(zcp) \
475 { \
476 (zcp)->zc_word[0] = BSWAP_64((zcp)->zc_word[0]); \
477 (zcp)->zc_word[1] = BSWAP_64((zcp)->zc_word[1]); \
478 (zcp)->zc_word[2] = BSWAP_64((zcp)->zc_word[2]); \
479 (zcp)->zc_word[3] = BSWAP_64((zcp)->zc_word[3]); \
480 }
481
482
483 #define DVA_IS_VALID(dva) (DVA_GET_ASIZE(dva) != 0)
484
485 #define ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3) \
486 { \
487 (zcp)->zc_word[0] = w0; \
488 (zcp)->zc_word[1] = w1; \
489 (zcp)->zc_word[2] = w2; \
490 (zcp)->zc_word[3] = w3; \
491 }
492
493 #define BP_IDENTITY(bp) (ASSERT(!BP_IS_EMBEDDED(bp)), &(bp)->blk_dva[0])
494 #define BP_IS_GANG(bp) \
495 (BP_IS_EMBEDDED(bp) ? B_FALSE : DVA_GET_GANG(BP_IDENTITY(bp)))
496 #define DVA_IS_EMPTY(dva) ((dva)->dva_word[0] == 0ULL && \
497 (dva)->dva_word[1] == 0ULL)
498 #define BP_IS_HOLE(bp) \
499 (!BP_IS_EMBEDDED(bp) && DVA_IS_EMPTY(BP_IDENTITY(bp)))
500
501 /* BP_IS_RAIDZ(bp) assumes no block compression */
502 #define BP_IS_RAIDZ(bp) (DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \
503 BP_GET_PSIZE(bp))
504
505 #define BP_ZERO(bp) \
506 { \
507 (bp)->blk_dva[0].dva_word[0] = 0; \
508 (bp)->blk_dva[0].dva_word[1] = 0; \
509 (bp)->blk_dva[1].dva_word[0] = 0; \
510 (bp)->blk_dva[1].dva_word[1] = 0; \
511 (bp)->blk_dva[2].dva_word[0] = 0; \
512 (bp)->blk_dva[2].dva_word[1] = 0; \
513 (bp)->blk_prop = 0; \
514 (bp)->blk_pad[0] = 0; \
515 (bp)->blk_pad[1] = 0; \
516 (bp)->blk_phys_birth = 0; \
517 (bp)->blk_birth = 0; \
518 (bp)->blk_fill = 0; \
519 ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0); \
520 }
521
522 #ifdef _BIG_ENDIAN
523 #define ZFS_HOST_BYTEORDER (0ULL)
524 #else
525 #define ZFS_HOST_BYTEORDER (1ULL)
526 #endif
527
528 #define BP_SHOULD_BYTESWAP(bp) (BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)
529
530 #define BP_SPRINTF_LEN 320
531
532 /*
533 * This macro allows code sharing between zfs, libzpool, and mdb.
534 * 'func' is either snprintf() or mdb_snprintf().
535 * 'ws' (whitespace) can be ' ' for single-line format, '\n' for multi-line.
536 */
537 #define SNPRINTF_BLKPTR(func, ws, buf, size, bp, type, checksum, compress) \
538 { \
539 static const char *copyname[] = \
540 { "zero", "single", "double", "triple" }; \
541 int len = 0; \
542 int copies = 0; \
543 \
544 if (bp == NULL) { \
545 len += func(buf + len, size - len, "<NULL>"); \
546 } else if (BP_IS_HOLE(bp)) { \
547 len += func(buf + len, size - len, \
548 "HOLE [L%llu %s] " \
549 "size=%llxL birth=%lluL", \
550 (u_longlong_t)BP_GET_LEVEL(bp), \
551 type, \
552 (u_longlong_t)BP_GET_LSIZE(bp), \
553 (u_longlong_t)bp->blk_birth); \
554 } else if (BP_IS_EMBEDDED(bp)) { \
555 len = func(buf + len, size - len, \
556 "EMBEDDED [L%llu %s] et=%u %s " \
557 "size=%llxL/%llxP birth=%lluL", \
558 (u_longlong_t)BP_GET_LEVEL(bp), \
559 type, \
560 (int)BPE_GET_ETYPE(bp), \
561 compress, \
562 (u_longlong_t)BPE_GET_LSIZE(bp), \
563 (u_longlong_t)BPE_GET_PSIZE(bp), \
564 (u_longlong_t)bp->blk_birth); \
565 } else { \
566 for (int d = 0; d < BP_GET_NDVAS(bp); d++) { \
567 const dva_t *dva = &bp->blk_dva[d]; \
568 if (DVA_IS_VALID(dva)) \
569 copies++; \
570 len += func(buf + len, size - len, \
571 "DVA[%d]=<%llu:%llx:%llx>%c", d, \
572 (u_longlong_t)DVA_GET_VDEV(dva), \
573 (u_longlong_t)DVA_GET_OFFSET(dva), \
574 (u_longlong_t)DVA_GET_ASIZE(dva), \
575 ws); \
576 } \
577 if (BP_IS_GANG(bp) && \
578 DVA_GET_ASIZE(&bp->blk_dva[2]) <= \
579 DVA_GET_ASIZE(&bp->blk_dva[1]) / 2) \
580 copies--; \
581 len += func(buf + len, size - len, \
582 "[L%llu %s] %s %s %s %s %s %s%c" \
583 "size=%llxL/%llxP birth=%lluL/%lluP fill=%llu%c" \
584 "cksum=%llx:%llx:%llx:%llx", \
585 (u_longlong_t)BP_GET_LEVEL(bp), \
586 type, \
587 checksum, \
588 compress, \
589 BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE", \
590 BP_IS_GANG(bp) ? "gang" : "contiguous", \
591 BP_GET_DEDUP(bp) ? "dedup" : "unique", \
592 copyname[copies], \
593 ws, \
594 (u_longlong_t)BP_GET_LSIZE(bp), \
595 (u_longlong_t)BP_GET_PSIZE(bp), \
596 (u_longlong_t)bp->blk_birth, \
597 (u_longlong_t)BP_PHYSICAL_BIRTH(bp), \
598 (u_longlong_t)BP_GET_FILL(bp), \
599 ws, \
600 (u_longlong_t)bp->blk_cksum.zc_word[0], \
601 (u_longlong_t)bp->blk_cksum.zc_word[1], \
602 (u_longlong_t)bp->blk_cksum.zc_word[2], \
603 (u_longlong_t)bp->blk_cksum.zc_word[3]); \
604 } \
605 ASSERT(len < size); \
606 }
607
608 #define BP_GET_BUFC_TYPE(bp) \
609 (BP_IS_METADATA(bp) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)
610
611 typedef enum spa_import_type {
612 SPA_IMPORT_EXISTING,
613 SPA_IMPORT_ASSEMBLE
614 } spa_import_type_t;
615
616 /* state manipulation functions */
617 extern int spa_open(const char *pool, spa_t **, void *tag);
618 extern int spa_open_rewind(const char *pool, spa_t **, void *tag,
619 nvlist_t *policy, nvlist_t **config);
620 extern int spa_get_stats(const char *pool, nvlist_t **config, char *altroot,
621 size_t buflen);
622 extern int spa_create(const char *pool, nvlist_t *config, nvlist_t *props,
623 nvlist_t *zplprops);
624 extern int spa_import_rootpool(char *devpath, char *devid);
625 extern int spa_import(const char *pool, nvlist_t *config, nvlist_t *props,
626 uint64_t flags);
627 extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
628 extern int spa_destroy(char *pool);
629 extern int spa_checkpoint(const char *pool);
630 extern int spa_checkpoint_discard(const char *pool);
631 extern int spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
632 boolean_t hardforce);
633 extern int spa_reset(char *pool);
634 extern void spa_async_request(spa_t *spa, int flag);
635 extern void spa_async_unrequest(spa_t *spa, int flag);
636 extern void spa_async_suspend(spa_t *spa);
637 extern void spa_async_resume(spa_t *spa);
638 extern spa_t *spa_inject_addref(char *pool);
639 extern void spa_inject_delref(spa_t *spa);
640 extern void spa_scan_stat_init(spa_t *spa);
641 extern int spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps);
642
643 #define SPA_ASYNC_CONFIG_UPDATE 0x01
644 #define SPA_ASYNC_REMOVE 0x02
645 #define SPA_ASYNC_PROBE 0x04
646 #define SPA_ASYNC_RESILVER_DONE 0x08
647 #define SPA_ASYNC_RESILVER 0x10
648 #define SPA_ASYNC_AUTOEXPAND 0x20
649 #define SPA_ASYNC_REMOVE_DONE 0x40
650 #define SPA_ASYNC_REMOVE_STOP 0x80
651
652 /*
653 * Controls the behavior of spa_vdev_remove().
654 */
655 #define SPA_REMOVE_UNSPARE 0x01
656 #define SPA_REMOVE_DONE 0x02
657
658 /* device manipulation */
659 extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot);
660 extern int spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot,
661 int replacing);
662 extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid,
663 int replace_done);
664 extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
665 extern boolean_t spa_vdev_remove_active(spa_t *spa);
666 extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath);
667 extern int spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru);
668 extern int spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config,
669 nvlist_t *props, boolean_t exp);
670
671 /* spare state (which is global across all pools) */
672 extern void spa_spare_add(vdev_t *vd);
673 extern void spa_spare_remove(vdev_t *vd);
674 extern boolean_t spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt);
675 extern void spa_spare_activate(vdev_t *vd);
676
677 /* L2ARC state (which is global across all pools) */
678 extern void spa_l2cache_add(vdev_t *vd);
679 extern void spa_l2cache_remove(vdev_t *vd);
680 extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
681 extern void spa_l2cache_activate(vdev_t *vd);
682 extern void spa_l2cache_drop(spa_t *spa);
683
684 /* scanning */
685 extern int spa_scan(spa_t *spa, pool_scan_func_t func);
686 extern int spa_scan_stop(spa_t *spa);
687 extern int spa_scrub_pause_resume(spa_t *spa, pool_scrub_cmd_t flag);
688
689 /* spa syncing */
690 extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
691 extern void spa_sync_allpools(void);
692
693 /* spa namespace global mutex */
694 extern kmutex_t spa_namespace_lock;
695
696 /*
697 * SPA configuration functions in spa_config.c
698 */
699
700 #define SPA_CONFIG_UPDATE_POOL 0
701 #define SPA_CONFIG_UPDATE_VDEVS 1
702
703 extern void spa_write_cachefile(spa_t *, boolean_t, boolean_t);
704 extern void spa_config_load(void);
705 extern nvlist_t *spa_all_configs(uint64_t *);
706 extern void spa_config_set(spa_t *spa, nvlist_t *config);
707 extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
708 int getstats);
709 extern void spa_config_update(spa_t *spa, int what);
710
711 /*
712 * Miscellaneous SPA routines in spa_misc.c
713 */
714
715 /* Namespace manipulation */
716 extern spa_t *spa_lookup(const char *name);
717 extern spa_t *spa_add(const char *name, nvlist_t *config, const char *altroot);
718 extern void spa_remove(spa_t *spa);
719 extern spa_t *spa_next(spa_t *prev);
720
721 /* Refcount functions */
722 extern void spa_open_ref(spa_t *spa, void *tag);
723 extern void spa_close(spa_t *spa, void *tag);
724 extern void spa_async_close(spa_t *spa, void *tag);
725 extern boolean_t spa_refcount_zero(spa_t *spa);
726
727 #define SCL_NONE 0x00
728 #define SCL_CONFIG 0x01
729 #define SCL_STATE 0x02
730 #define SCL_L2ARC 0x04 /* hack until L2ARC 2.0 */
731 #define SCL_ALLOC 0x08
732 #define SCL_ZIO 0x10
733 #define SCL_FREE 0x20
734 #define SCL_VDEV 0x40
735 #define SCL_LOCKS 7
736 #define SCL_ALL ((1 << SCL_LOCKS) - 1)
737 #define SCL_STATE_ALL (SCL_STATE | SCL_L2ARC | SCL_ZIO)
738
739 /* Pool configuration locks */
740 extern int spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw);
741 extern void spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw);
742 extern void spa_config_exit(spa_t *spa, int locks, void *tag);
743 extern int spa_config_held(spa_t *spa, int locks, krw_t rw);
744
745 /* Pool vdev add/remove lock */
746 extern uint64_t spa_vdev_enter(spa_t *spa);
747 extern uint64_t spa_vdev_config_enter(spa_t *spa);
748 extern void spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg,
749 int error, char *tag);
750 extern int spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error);
751
752 /* Pool vdev state change lock */
753 extern void spa_vdev_state_enter(spa_t *spa, int oplock);
754 extern int spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error);
755
756 /* Log state */
757 typedef enum spa_log_state {
758 SPA_LOG_UNKNOWN = 0, /* unknown log state */
759 SPA_LOG_MISSING, /* missing log(s) */
760 SPA_LOG_CLEAR, /* clear the log(s) */
761 SPA_LOG_GOOD, /* log(s) are good */
762 } spa_log_state_t;
763
764 extern spa_log_state_t spa_get_log_state(spa_t *spa);
765 extern void spa_set_log_state(spa_t *spa, spa_log_state_t state);
766 extern int spa_reset_logs(spa_t *spa);
767
768 /* Log claim callback */
769 extern void spa_claim_notify(zio_t *zio);
770
771 /* Accessor functions */
772 extern boolean_t spa_shutting_down(spa_t *spa);
773 extern struct dsl_pool *spa_get_dsl(spa_t *spa);
774 extern boolean_t spa_is_initializing(spa_t *spa);
775 extern boolean_t spa_indirect_vdevs_loaded(spa_t *spa);
776 extern blkptr_t *spa_get_rootblkptr(spa_t *spa);
777 extern void spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp);
778 extern void spa_altroot(spa_t *, char *, size_t);
779 extern int spa_sync_pass(spa_t *spa);
780 extern char *spa_name(spa_t *spa);
781 extern uint64_t spa_guid(spa_t *spa);
782 extern uint64_t spa_load_guid(spa_t *spa);
783 extern uint64_t spa_last_synced_txg(spa_t *spa);
784 extern uint64_t spa_first_txg(spa_t *spa);
785 extern uint64_t spa_syncing_txg(spa_t *spa);
786 extern uint64_t spa_final_dirty_txg(spa_t *spa);
787 extern uint64_t spa_version(spa_t *spa);
788 extern pool_state_t spa_state(spa_t *spa);
789 extern spa_load_state_t spa_load_state(spa_t *spa);
790 extern uint64_t spa_freeze_txg(spa_t *spa);
791 extern uint64_t spa_get_worst_case_asize(spa_t *spa, uint64_t lsize);
792 extern uint64_t spa_get_dspace(spa_t *spa);
793 extern uint64_t spa_get_checkpoint_space(spa_t *spa);
794 extern uint64_t spa_get_slop_space(spa_t *spa);
795 extern void spa_update_dspace(spa_t *spa);
796 extern uint64_t spa_version(spa_t *spa);
797 extern boolean_t spa_deflate(spa_t *spa);
798 extern metaslab_class_t *spa_normal_class(spa_t *spa);
799 extern metaslab_class_t *spa_log_class(spa_t *spa);
800 extern void spa_evicting_os_register(spa_t *, objset_t *os);
801 extern void spa_evicting_os_deregister(spa_t *, objset_t *os);
802 extern void spa_evicting_os_wait(spa_t *spa);
803 extern int spa_max_replication(spa_t *spa);
804 extern int spa_prev_software_version(spa_t *spa);
805 extern int spa_busy(void);
806 extern uint8_t spa_get_failmode(spa_t *spa);
807 extern boolean_t spa_suspended(spa_t *spa);
808 extern uint64_t spa_bootfs(spa_t *spa);
809 extern uint64_t spa_delegation(spa_t *spa);
810 extern objset_t *spa_meta_objset(spa_t *spa);
811 extern uint64_t spa_deadman_synctime(spa_t *spa);
812
813 /* Miscellaneous support routines */
814 extern void spa_load_failed(spa_t *spa, const char *fmt, ...);
815 extern void spa_load_note(spa_t *spa, const char *fmt, ...);
816 extern void spa_activate_mos_feature(spa_t *spa, const char *feature,
817 dmu_tx_t *tx);
818 extern void spa_deactivate_mos_feature(spa_t *spa, const char *feature);
819 extern int spa_rename(const char *oldname, const char *newname);
820 extern spa_t *spa_by_guid(uint64_t pool_guid, uint64_t device_guid);
821 extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
822 extern char *spa_strdup(const char *);
823 extern void spa_strfree(char *);
824 extern uint64_t spa_get_random(uint64_t range);
825 extern uint64_t spa_generate_guid(spa_t *spa);
826 extern void snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp);
827 extern void spa_freeze(spa_t *spa);
828 extern int spa_change_guid(spa_t *spa);
829 extern void spa_upgrade(spa_t *spa, uint64_t version);
830 extern void spa_evict_all(void);
831 extern vdev_t *spa_lookup_by_guid(spa_t *spa, uint64_t guid,
832 boolean_t l2cache);
833 extern boolean_t spa_has_spare(spa_t *, uint64_t guid);
834 extern uint64_t dva_get_dsize_sync(spa_t *spa, const dva_t *dva);
835 extern uint64_t bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp);
836 extern uint64_t bp_get_dsize(spa_t *spa, const blkptr_t *bp);
837 extern boolean_t spa_has_slogs(spa_t *spa);
838 extern boolean_t spa_is_root(spa_t *spa);
839 extern boolean_t spa_writeable(spa_t *spa);
840 extern boolean_t spa_has_pending_synctask(spa_t *spa);
841 extern int spa_maxblocksize(spa_t *spa);
842 extern boolean_t spa_has_checkpoint(spa_t *spa);
843 extern boolean_t spa_importing_readonly_checkpoint(spa_t *spa);
844 extern boolean_t spa_suspend_async_destroy(spa_t *spa);
845 extern uint64_t spa_min_claim_txg(spa_t *spa);
846 extern void zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp);
847 extern boolean_t zfs_dva_valid(spa_t *spa, const dva_t *dva,
848 const blkptr_t *bp);
849 typedef void (*spa_remap_cb_t)(uint64_t vdev, uint64_t offset, uint64_t size,
850 void *arg);
851 extern boolean_t spa_remap_blkptr(spa_t *spa, blkptr_t *bp,
852 spa_remap_cb_t callback, void *arg);
853 extern uint64_t spa_get_last_removal_txg(spa_t *spa);
854 extern boolean_t spa_trust_config(spa_t *spa);
855 extern uint64_t spa_missing_tvds_allowed(spa_t *spa);
856 extern void spa_set_missing_tvds(spa_t *spa, uint64_t missing);
857 extern boolean_t spa_top_vdevs_spacemap_addressable(spa_t *spa);
858
859 extern int spa_mode(spa_t *spa);
860 extern uint64_t zfs_strtonum(const char *str, char **nptr);
861
862 extern char *spa_his_ievent_table[];
863
864 extern void spa_history_create_obj(spa_t *spa, dmu_tx_t *tx);
865 extern int spa_history_get(spa_t *spa, uint64_t *offset, uint64_t *len_read,
866 char *his_buf);
867 extern int spa_history_log(spa_t *spa, const char *his_buf);
868 extern int spa_history_log_nvl(spa_t *spa, nvlist_t *nvl);
869 extern void spa_history_log_version(spa_t *spa, const char *operation);
870 extern void spa_history_log_internal(spa_t *spa, const char *operation,
871 dmu_tx_t *tx, const char *fmt, ...);
872 extern void spa_history_log_internal_ds(struct dsl_dataset *ds, const char *op,
873 dmu_tx_t *tx, const char *fmt, ...);
874 extern void spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
875 dmu_tx_t *tx, const char *fmt, ...);
876
877 /* error handling */
878 struct zbookmark_phys;
879 extern void spa_log_error(spa_t *spa, zio_t *zio);
880 extern void zfs_ereport_post(const char *class, spa_t *spa, vdev_t *vd,
881 zio_t *zio, uint64_t stateoroffset, uint64_t length);
882 extern void zfs_post_remove(spa_t *spa, vdev_t *vd);
883 extern void zfs_post_state_change(spa_t *spa, vdev_t *vd);
884 extern void zfs_post_autoreplace(spa_t *spa, vdev_t *vd);
885 extern uint64_t spa_get_errlog_size(spa_t *spa);
886 extern int spa_get_errlog(spa_t *spa, void *uaddr, size_t *count);
887 extern void spa_errlog_rotate(spa_t *spa);
888 extern void spa_errlog_drain(spa_t *spa);
889 extern void spa_errlog_sync(spa_t *spa, uint64_t txg);
890 extern void spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub);
891
892 /* vdev cache */
893 extern void vdev_cache_stat_init(void);
894 extern void vdev_cache_stat_fini(void);
895
896 /* Initialization and termination */
897 extern void spa_init(int flags);
898 extern void spa_fini(void);
899 extern void spa_boot_init(void);
900
901 /* properties */
902 extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
903 extern int spa_prop_get(spa_t *spa, nvlist_t **nvp);
904 extern void spa_prop_clear_bootfs(spa_t *spa, uint64_t obj, dmu_tx_t *tx);
905 extern void spa_configfile_set(spa_t *, nvlist_t *, boolean_t);
906
907 /* asynchronous event notification */
908 extern void spa_event_notify(spa_t *spa, vdev_t *vdev, nvlist_t *hist_nvl,
909 const char *name);
910 extern sysevent_t *spa_event_create(spa_t *spa, vdev_t *vd, nvlist_t *hist_nvl,
911 const char *name);
912 extern void spa_event_post(sysevent_t *ev);
913 extern void spa_event_discard(sysevent_t *ev);
914
915 #ifdef ZFS_DEBUG
916 #define dprintf_bp(bp, fmt, ...) do { \
917 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
918 char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP); \
919 snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp)); \
920 dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf); \
921 kmem_free(__blkbuf, BP_SPRINTF_LEN); \
922 } \
923 _NOTE(CONSTCOND) } while (0)
924 #else
925 #define dprintf_bp(bp, fmt, ...)
926 #endif
927
928 extern boolean_t spa_debug_enabled(spa_t *spa);
929 #define spa_dbgmsg(spa, ...) \
930 { \
931 if (spa_debug_enabled(spa)) \
932 zfs_dbgmsg(__VA_ARGS__); \
933 }
934
935 extern int spa_mode_global; /* mode, e.g. FREAD | FWRITE */
936
937 #ifdef __cplusplus
938 }
939 #endif
940
941 #endif /* _SYS_SPA_H */
Unleashed OS