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Merge commit '7e3488dc6cdcb0c04e1ce167a1a3bfef83b5f2e0'
[unleashed.git] / kernel / fs / zfs / sys / spa.h
blob1acbe3137737166e1db480b405f0510b25ee6605
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 #define SPA_VDEVBITS 24
142
143 /*
144 * All SPA data is represented by 128-bit data virtual addresses (DVAs).
145 * The members of the dva_t should be considered opaque outside the SPA.
146 */
147 typedef struct dva {
148 uint64_t dva_word[2];
149 } dva_t;
150
151 /*
152 * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
153 */
154 typedef struct zio_cksum {
155 uint64_t zc_word[4];
156 } zio_cksum_t;
157
158 /*
159 * Some checksums/hashes need a 256-bit initialization salt. This salt is kept
160 * secret and is suitable for use in MAC algorithms as the key.
161 */
162 typedef struct zio_cksum_salt {
163 uint8_t zcs_bytes[32];
164 } zio_cksum_salt_t;
165
166 /*
167 * Each block is described by its DVAs, time of birth, checksum, etc.
168 * The word-by-word, bit-by-bit layout of the blkptr is as follows:
169 *
170 * 64 56 48 40 32 24 16 8 0
171 * +-------+-------+-------+-------+-------+-------+-------+-------+
172 * 0 | pad | vdev1 | GRID | ASIZE |
173 * +-------+-------+-------+-------+-------+-------+-------+-------+
174 * 1 |G| offset1 |
175 * +-------+-------+-------+-------+-------+-------+-------+-------+
176 * 2 | pad | vdev2 | GRID | ASIZE |
177 * +-------+-------+-------+-------+-------+-------+-------+-------+
178 * 3 |G| offset2 |
179 * +-------+-------+-------+-------+-------+-------+-------+-------+
180 * 4 | pad | vdev3 | GRID | ASIZE |
181 * +-------+-------+-------+-------+-------+-------+-------+-------+
182 * 5 |G| offset3 |
183 * +-------+-------+-------+-------+-------+-------+-------+-------+
184 * 6 |BDX|lvl| type | cksum |E| comp| PSIZE | LSIZE |
185 * +-------+-------+-------+-------+-------+-------+-------+-------+
186 * 7 | padding |
187 * +-------+-------+-------+-------+-------+-------+-------+-------+
188 * 8 | padding |
189 * +-------+-------+-------+-------+-------+-------+-------+-------+
190 * 9 | physical birth txg |
191 * +-------+-------+-------+-------+-------+-------+-------+-------+
192 * a | logical birth txg |
193 * +-------+-------+-------+-------+-------+-------+-------+-------+
194 * b | fill count |
195 * +-------+-------+-------+-------+-------+-------+-------+-------+
196 * c | checksum[0] |
197 * +-------+-------+-------+-------+-------+-------+-------+-------+
198 * d | checksum[1] |
199 * +-------+-------+-------+-------+-------+-------+-------+-------+
200 * e | checksum[2] |
201 * +-------+-------+-------+-------+-------+-------+-------+-------+
202 * f | checksum[3] |
203 * +-------+-------+-------+-------+-------+-------+-------+-------+
204 *
205 * Legend:
206 *
207 * vdev virtual device ID
208 * offset offset into virtual device
209 * LSIZE logical size
210 * PSIZE physical size (after compression)
211 * ASIZE allocated size (including RAID-Z parity and gang block headers)
212 * GRID RAID-Z layout information (reserved for future use)
213 * cksum checksum function
214 * comp compression function
215 * G gang block indicator
216 * B byteorder (endianness)
217 * D dedup
218 * X encryption (on version 30, which is not supported)
219 * E blkptr_t contains embedded data (see below)
220 * lvl level of indirection
221 * type DMU object type
222 * phys birth txg when dva[0] was written; zero if same as logical birth txg
223 * note that typically all the dva's would be written in this
224 * txg, but they could be different if they were moved by
225 * device removal.
226 * log. birth transaction group in which the block was logically born
227 * fill count number of non-zero blocks under this bp
228 * checksum[4] 256-bit checksum of the data this bp describes
229 */
230
231 /*
232 * "Embedded" blkptr_t's don't actually point to a block, instead they
233 * have a data payload embedded in the blkptr_t itself. See the comment
234 * in blkptr.c for more details.
235 *
236 * The blkptr_t is laid out as follows:
237 *
238 * 64 56 48 40 32 24 16 8 0
239 * +-------+-------+-------+-------+-------+-------+-------+-------+
240 * 0 | payload |
241 * 1 | payload |
242 * 2 | payload |
243 * 3 | payload |
244 * 4 | payload |
245 * 5 | payload |
246 * +-------+-------+-------+-------+-------+-------+-------+-------+
247 * 6 |BDX|lvl| type | etype |E| comp| PSIZE| LSIZE |
248 * +-------+-------+-------+-------+-------+-------+-------+-------+
249 * 7 | payload |
250 * 8 | payload |
251 * 9 | payload |
252 * +-------+-------+-------+-------+-------+-------+-------+-------+
253 * a | logical birth txg |
254 * +-------+-------+-------+-------+-------+-------+-------+-------+
255 * b | payload |
256 * c | payload |
257 * d | payload |
258 * e | payload |
259 * f | payload |
260 * +-------+-------+-------+-------+-------+-------+-------+-------+
261 *
262 * Legend:
263 *
264 * payload contains the embedded data
265 * B (byteorder) byteorder (endianness)
266 * D (dedup) padding (set to zero)
267 * X encryption (set to zero; see above)
268 * E (embedded) set to one
269 * lvl indirection level
270 * type DMU object type
271 * etype how to interpret embedded data (BP_EMBEDDED_TYPE_*)
272 * comp compression function of payload
273 * PSIZE size of payload after compression, in bytes
274 * LSIZE logical size of payload, in bytes
275 * note that 25 bits is enough to store the largest
276 * "normal" BP's LSIZE (2^16 * 2^9) in bytes
277 * log. birth transaction group in which the block was logically born
278 *
279 * Note that LSIZE and PSIZE are stored in bytes, whereas for non-embedded
280 * bp's they are stored in units of SPA_MINBLOCKSHIFT.
281 * Generally, the generic BP_GET_*() macros can be used on embedded BP's.
282 * The B, D, X, lvl, type, and comp fields are stored the same as with normal
283 * BP's so the BP_SET_* macros can be used with them. etype, PSIZE, LSIZE must
284 * be set with the BPE_SET_* macros. BP_SET_EMBEDDED() should be called before
285 * other macros, as they assert that they are only used on BP's of the correct
286 * "embedded-ness".
287 */
288
289 #define BPE_GET_ETYPE(bp) \
290 (ASSERT(BP_IS_EMBEDDED(bp)), \
291 BF64_GET((bp)->blk_prop, 40, 8))
292 #define BPE_SET_ETYPE(bp, t) do { \
293 ASSERT(BP_IS_EMBEDDED(bp)); \
294 BF64_SET((bp)->blk_prop, 40, 8, t); \
295 _NOTE(CONSTCOND) } while (0)
296
297 #define BPE_GET_LSIZE(bp) \
298 (ASSERT(BP_IS_EMBEDDED(bp)), \
299 BF64_GET_SB((bp)->blk_prop, 0, 25, 0, 1))
300 #define BPE_SET_LSIZE(bp, x) do { \
301 ASSERT(BP_IS_EMBEDDED(bp)); \
302 BF64_SET_SB((bp)->blk_prop, 0, 25, 0, 1, x); \
303 _NOTE(CONSTCOND) } while (0)
304
305 #define BPE_GET_PSIZE(bp) \
306 (ASSERT(BP_IS_EMBEDDED(bp)), \
307 BF64_GET_SB((bp)->blk_prop, 25, 7, 0, 1))
308 #define BPE_SET_PSIZE(bp, x) do { \
309 ASSERT(BP_IS_EMBEDDED(bp)); \
310 BF64_SET_SB((bp)->blk_prop, 25, 7, 0, 1, x); \
311 _NOTE(CONSTCOND) } while (0)
312
313 typedef enum bp_embedded_type {
314 BP_EMBEDDED_TYPE_DATA,
315 BP_EMBEDDED_TYPE_RESERVED, /* Reserved for an unintegrated feature. */
316 NUM_BP_EMBEDDED_TYPES = BP_EMBEDDED_TYPE_RESERVED
317 } bp_embedded_type_t;
318
319 #define BPE_NUM_WORDS 14
320 #define BPE_PAYLOAD_SIZE (BPE_NUM_WORDS * sizeof (uint64_t))
321 #define BPE_IS_PAYLOADWORD(bp, wp) \
322 ((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)
323
324 #define SPA_BLKPTRSHIFT 7 /* blkptr_t is 128 bytes */
325 #define SPA_DVAS_PER_BP 3 /* Number of DVAs in a bp */
326 #define SPA_SYNC_MIN_VDEVS 3 /* min vdevs to update during sync */
327
328 /*
329 * A block is a hole when it has either 1) never been written to, or
330 * 2) is zero-filled. In both cases, ZFS can return all zeroes for all reads
331 * without physically allocating disk space. Holes are represented in the
332 * blkptr_t structure by zeroed blk_dva. Correct checking for holes is
333 * done through the BP_IS_HOLE macro. For holes, the logical size, level,
334 * DMU object type, and birth times are all also stored for holes that
335 * were written to at some point (i.e. were punched after having been filled).
336 */
337 typedef struct blkptr {
338 dva_t blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
339 uint64_t blk_prop; /* size, compression, type, etc */
340 uint64_t blk_pad[2]; /* Extra space for the future */
341 uint64_t blk_phys_birth; /* txg when block was allocated */
342 uint64_t blk_birth; /* transaction group at birth */
343 uint64_t blk_fill; /* fill count */
344 zio_cksum_t blk_cksum; /* 256-bit checksum */
345 } blkptr_t;
346
347 /*
348 * Macros to get and set fields in a bp or DVA.
349 */
350 #define DVA_GET_ASIZE(dva) \
351 BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0)
352 #define DVA_SET_ASIZE(dva, x) \
353 BF64_SET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, \
354 SPA_MINBLOCKSHIFT, 0, x)
355
356 #define DVA_GET_GRID(dva) BF64_GET((dva)->dva_word[0], 24, 8)
357 #define DVA_SET_GRID(dva, x) BF64_SET((dva)->dva_word[0], 24, 8, x)
358
359 #define DVA_GET_VDEV(dva) BF64_GET((dva)->dva_word[0], 32, SPA_VDEVBITS)
360 #define DVA_SET_VDEV(dva, x) \
361 BF64_SET((dva)->dva_word[0], 32, SPA_VDEVBITS, x)
362
363 #define DVA_GET_OFFSET(dva) \
364 BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
365 #define DVA_SET_OFFSET(dva, x) \
366 BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)
367
368 #define DVA_GET_GANG(dva) BF64_GET((dva)->dva_word[1], 63, 1)
369 #define DVA_SET_GANG(dva, x) BF64_SET((dva)->dva_word[1], 63, 1, x)
370
371 #define BP_GET_LSIZE(bp) \
372 (BP_IS_EMBEDDED(bp) ? \
373 (BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA ? BPE_GET_LSIZE(bp) : 0): \
374 BF64_GET_SB((bp)->blk_prop, 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1))
375 #define BP_SET_LSIZE(bp, x) do { \
376 ASSERT(!BP_IS_EMBEDDED(bp)); \
377 BF64_SET_SB((bp)->blk_prop, \
378 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
379 _NOTE(CONSTCOND) } while (0)
380
381 #define BP_GET_PSIZE(bp) \
382 (BP_IS_EMBEDDED(bp) ? 0 : \
383 BF64_GET_SB((bp)->blk_prop, 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1))
384 #define BP_SET_PSIZE(bp, x) do { \
385 ASSERT(!BP_IS_EMBEDDED(bp)); \
386 BF64_SET_SB((bp)->blk_prop, \
387 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
388 _NOTE(CONSTCOND) } while (0)
389
390 #define BP_GET_COMPRESS(bp) \
391 BF64_GET((bp)->blk_prop, 32, SPA_COMPRESSBITS)
392 #define BP_SET_COMPRESS(bp, x) \
393 BF64_SET((bp)->blk_prop, 32, SPA_COMPRESSBITS, x)
394
395 #define BP_IS_EMBEDDED(bp) BF64_GET((bp)->blk_prop, 39, 1)
396 #define BP_SET_EMBEDDED(bp, x) BF64_SET((bp)->blk_prop, 39, 1, x)
397
398 #define BP_GET_CHECKSUM(bp) \
399 (BP_IS_EMBEDDED(bp) ? ZIO_CHECKSUM_OFF : \
400 BF64_GET((bp)->blk_prop, 40, 8))
401 #define BP_SET_CHECKSUM(bp, x) do { \
402 ASSERT(!BP_IS_EMBEDDED(bp)); \
403 BF64_SET((bp)->blk_prop, 40, 8, x); \
404 _NOTE(CONSTCOND) } while (0)
405
406 #define BP_GET_TYPE(bp) BF64_GET((bp)->blk_prop, 48, 8)
407 #define BP_SET_TYPE(bp, x) BF64_SET((bp)->blk_prop, 48, 8, x)
408
409 #define BP_GET_LEVEL(bp) BF64_GET((bp)->blk_prop, 56, 5)
410 #define BP_SET_LEVEL(bp, x) BF64_SET((bp)->blk_prop, 56, 5, x)
411
412 #define BP_GET_DEDUP(bp) BF64_GET((bp)->blk_prop, 62, 1)
413 #define BP_SET_DEDUP(bp, x) BF64_SET((bp)->blk_prop, 62, 1, x)
414
415 #define BP_GET_BYTEORDER(bp) BF64_GET((bp)->blk_prop, 63, 1)
416 #define BP_SET_BYTEORDER(bp, x) BF64_SET((bp)->blk_prop, 63, 1, x)
417
418 #define BP_PHYSICAL_BIRTH(bp) \
419 (BP_IS_EMBEDDED(bp) ? 0 : \
420 (bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)
421
422 #define BP_SET_BIRTH(bp, logical, physical) \
423 { \
424 ASSERT(!BP_IS_EMBEDDED(bp)); \
425 (bp)->blk_birth = (logical); \
426 (bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \
427 }
428
429 #define BP_GET_FILL(bp) (BP_IS_EMBEDDED(bp) ? 1 : (bp)->blk_fill)
430
431 #define BP_IS_METADATA(bp) \
432 (BP_GET_LEVEL(bp) > 0 || DMU_OT_IS_METADATA(BP_GET_TYPE(bp)))
433
434 #define BP_GET_ASIZE(bp) \
435 (BP_IS_EMBEDDED(bp) ? 0 : \
436 DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
437 DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
438 DVA_GET_ASIZE(&(bp)->blk_dva[2]))
439
440 #define BP_GET_UCSIZE(bp) \
441 (BP_IS_METADATA(bp) ? BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp))
442
443 #define BP_GET_NDVAS(bp) \
444 (BP_IS_EMBEDDED(bp) ? 0 : \
445 !!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
446 !!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
447 !!DVA_GET_ASIZE(&(bp)->blk_dva[2]))
448
449 #define BP_COUNT_GANG(bp) \
450 (BP_IS_EMBEDDED(bp) ? 0 : \
451 (DVA_GET_GANG(&(bp)->blk_dva[0]) + \
452 DVA_GET_GANG(&(bp)->blk_dva[1]) + \
453 DVA_GET_GANG(&(bp)->blk_dva[2])))
454
455 #define DVA_EQUAL(dva1, dva2) \
456 ((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
457 (dva1)->dva_word[0] == (dva2)->dva_word[0])
458
459 #define BP_EQUAL(bp1, bp2) \
460 (BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) && \
461 (bp1)->blk_birth == (bp2)->blk_birth && \
462 DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) && \
463 DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) && \
464 DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2]))
465
466 #define ZIO_CHECKSUM_EQUAL(zc1, zc2) \
467 (0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
468 ((zc1).zc_word[1] - (zc2).zc_word[1]) | \
469 ((zc1).zc_word[2] - (zc2).zc_word[2]) | \
470 ((zc1).zc_word[3] - (zc2).zc_word[3])))
471
472 #define ZIO_CHECKSUM_IS_ZERO(zc) \
473 (0 == ((zc)->zc_word[0] | (zc)->zc_word[1] | \
474 (zc)->zc_word[2] | (zc)->zc_word[3]))
475
476 #define ZIO_CHECKSUM_BSWAP(zcp) \
477 { \
478 (zcp)->zc_word[0] = BSWAP_64((zcp)->zc_word[0]); \
479 (zcp)->zc_word[1] = BSWAP_64((zcp)->zc_word[1]); \
480 (zcp)->zc_word[2] = BSWAP_64((zcp)->zc_word[2]); \
481 (zcp)->zc_word[3] = BSWAP_64((zcp)->zc_word[3]); \
482 }
483
484
485 #define DVA_IS_VALID(dva) (DVA_GET_ASIZE(dva) != 0)
486
487 #define ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3) \
488 { \
489 (zcp)->zc_word[0] = w0; \
490 (zcp)->zc_word[1] = w1; \
491 (zcp)->zc_word[2] = w2; \
492 (zcp)->zc_word[3] = w3; \
493 }
494
495 #define BP_IDENTITY(bp) (ASSERT(!BP_IS_EMBEDDED(bp)), &(bp)->blk_dva[0])
496 #define BP_IS_GANG(bp) \
497 (BP_IS_EMBEDDED(bp) ? B_FALSE : DVA_GET_GANG(BP_IDENTITY(bp)))
498 #define DVA_IS_EMPTY(dva) ((dva)->dva_word[0] == 0ULL && \
499 (dva)->dva_word[1] == 0ULL)
500 #define BP_IS_HOLE(bp) \
501 (!BP_IS_EMBEDDED(bp) && DVA_IS_EMPTY(BP_IDENTITY(bp)))
502
503 /* BP_IS_RAIDZ(bp) assumes no block compression */
504 #define BP_IS_RAIDZ(bp) (DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \
505 BP_GET_PSIZE(bp))
506
507 #define BP_ZERO(bp) \
508 { \
509 (bp)->blk_dva[0].dva_word[0] = 0; \
510 (bp)->blk_dva[0].dva_word[1] = 0; \
511 (bp)->blk_dva[1].dva_word[0] = 0; \
512 (bp)->blk_dva[1].dva_word[1] = 0; \
513 (bp)->blk_dva[2].dva_word[0] = 0; \
514 (bp)->blk_dva[2].dva_word[1] = 0; \
515 (bp)->blk_prop = 0; \
516 (bp)->blk_pad[0] = 0; \
517 (bp)->blk_pad[1] = 0; \
518 (bp)->blk_phys_birth = 0; \
519 (bp)->blk_birth = 0; \
520 (bp)->blk_fill = 0; \
521 ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0); \
522 }
523
524 #ifdef _BIG_ENDIAN
525 #define ZFS_HOST_BYTEORDER (0ULL)
526 #else
527 #define ZFS_HOST_BYTEORDER (1ULL)
528 #endif
529
530 #define BP_SHOULD_BYTESWAP(bp) (BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)
531
532 #define BP_SPRINTF_LEN 320
533
534 /*
535 * This macro allows code sharing between zfs, libzpool, and mdb.
536 * 'func' is either snprintf() or mdb_snprintf().
537 * 'ws' (whitespace) can be ' ' for single-line format, '\n' for multi-line.
538 */
539 #define SNPRINTF_BLKPTR(func, ws, buf, size, bp, type, checksum, compress) \
540 { \
541 static const char *copyname[] = \
542 { "zero", "single", "double", "triple" }; \
543 int len = 0; \
544 int copies = 0; \
545 \
546 if (bp == NULL) { \
547 len += func(buf + len, size - len, "<NULL>"); \
548 } else if (BP_IS_HOLE(bp)) { \
549 len += func(buf + len, size - len, \
550 "HOLE [L%llu %s] " \
551 "size=%llxL birth=%lluL", \
552 (u_longlong_t)BP_GET_LEVEL(bp), \
553 type, \
554 (u_longlong_t)BP_GET_LSIZE(bp), \
555 (u_longlong_t)bp->blk_birth); \
556 } else if (BP_IS_EMBEDDED(bp)) { \
557 len = func(buf + len, size - len, \
558 "EMBEDDED [L%llu %s] et=%u %s " \
559 "size=%llxL/%llxP birth=%lluL", \
560 (u_longlong_t)BP_GET_LEVEL(bp), \
561 type, \
562 (int)BPE_GET_ETYPE(bp), \
563 compress, \
564 (u_longlong_t)BPE_GET_LSIZE(bp), \
565 (u_longlong_t)BPE_GET_PSIZE(bp), \
566 (u_longlong_t)bp->blk_birth); \
567 } else { \
568 for (int d = 0; d < BP_GET_NDVAS(bp); d++) { \
569 const dva_t *dva = &bp->blk_dva[d]; \
570 if (DVA_IS_VALID(dva)) \
571 copies++; \
572 len += func(buf + len, size - len, \
573 "DVA[%d]=<%llu:%llx:%llx>%c", d, \
574 (u_longlong_t)DVA_GET_VDEV(dva), \
575 (u_longlong_t)DVA_GET_OFFSET(dva), \
576 (u_longlong_t)DVA_GET_ASIZE(dva), \
577 ws); \
578 } \
579 if (BP_IS_GANG(bp) && \
580 DVA_GET_ASIZE(&bp->blk_dva[2]) <= \
581 DVA_GET_ASIZE(&bp->blk_dva[1]) / 2) \
582 copies--; \
583 len += func(buf + len, size - len, \
584 "[L%llu %s] %s %s %s %s %s %s%c" \
585 "size=%llxL/%llxP birth=%lluL/%lluP fill=%llu%c" \
586 "cksum=%llx:%llx:%llx:%llx", \
587 (u_longlong_t)BP_GET_LEVEL(bp), \
588 type, \
589 checksum, \
590 compress, \
591 BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE", \
592 BP_IS_GANG(bp) ? "gang" : "contiguous", \
593 BP_GET_DEDUP(bp) ? "dedup" : "unique", \
594 copyname[copies], \
595 ws, \
596 (u_longlong_t)BP_GET_LSIZE(bp), \
597 (u_longlong_t)BP_GET_PSIZE(bp), \
598 (u_longlong_t)bp->blk_birth, \
599 (u_longlong_t)BP_PHYSICAL_BIRTH(bp), \
600 (u_longlong_t)BP_GET_FILL(bp), \
601 ws, \
602 (u_longlong_t)bp->blk_cksum.zc_word[0], \
603 (u_longlong_t)bp->blk_cksum.zc_word[1], \
604 (u_longlong_t)bp->blk_cksum.zc_word[2], \
605 (u_longlong_t)bp->blk_cksum.zc_word[3]); \
606 } \
607 ASSERT(len < size); \
608 }
609
610 #define BP_GET_BUFC_TYPE(bp) \
611 (BP_IS_METADATA(bp) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)
612
613 typedef enum spa_import_type {
614 SPA_IMPORT_EXISTING,
615 SPA_IMPORT_ASSEMBLE
616 } spa_import_type_t;
617
618 /* state manipulation functions */
619 extern int spa_open(const char *pool, spa_t **, void *tag);
620 extern int spa_open_rewind(const char *pool, spa_t **, void *tag,
621 nvlist_t *policy, nvlist_t **config);
622 extern int spa_get_stats(const char *pool, nvlist_t **config, char *altroot,
623 size_t buflen);
624 extern int spa_create(const char *pool, nvlist_t *config, nvlist_t *props,
625 nvlist_t *zplprops);
626 extern int spa_import_rootpool(char *devpath, char *devid);
627 extern int spa_import(const char *pool, nvlist_t *config, nvlist_t *props,
628 uint64_t flags);
629 extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
630 extern int spa_destroy(char *pool);
631 extern int spa_checkpoint(const char *pool);
632 extern int spa_checkpoint_discard(const char *pool);
633 extern int spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
634 boolean_t hardforce);
635 extern int spa_reset(char *pool);
636 extern void spa_async_request(spa_t *spa, int flag);
637 extern void spa_async_unrequest(spa_t *spa, int flag);
638 extern void spa_async_suspend(spa_t *spa);
639 extern void spa_async_resume(spa_t *spa);
640 extern spa_t *spa_inject_addref(char *pool);
641 extern void spa_inject_delref(spa_t *spa);
642 extern void spa_scan_stat_init(spa_t *spa);
643 extern int spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps);
644
645 #define SPA_ASYNC_CONFIG_UPDATE 0x01
646 #define SPA_ASYNC_REMOVE 0x02
647 #define SPA_ASYNC_PROBE 0x04
648 #define SPA_ASYNC_RESILVER_DONE 0x08
649 #define SPA_ASYNC_RESILVER 0x10
650 #define SPA_ASYNC_AUTOEXPAND 0x20
651 #define SPA_ASYNC_REMOVE_DONE 0x40
652 #define SPA_ASYNC_REMOVE_STOP 0x80
653 #define SPA_ASYNC_INITIALIZE_RESTART 0x100
654
655 /*
656 * Controls the behavior of spa_vdev_remove().
657 */
658 #define SPA_REMOVE_UNSPARE 0x01
659 #define SPA_REMOVE_DONE 0x02
660
661 /* device manipulation */
662 extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot);
663 extern int spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot,
664 int replacing);
665 extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid,
666 int replace_done);
667 extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
668 extern boolean_t spa_vdev_remove_active(spa_t *spa);
669 extern int spa_vdev_initialize(spa_t *spa, uint64_t guid, uint64_t cmd_type);
670 extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath);
671 extern int spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru);
672 extern int spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config,
673 nvlist_t *props, boolean_t exp);
674
675 /* spare state (which is global across all pools) */
676 extern void spa_spare_add(vdev_t *vd);
677 extern void spa_spare_remove(vdev_t *vd);
678 extern boolean_t spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt);
679 extern void spa_spare_activate(vdev_t *vd);
680
681 /* L2ARC state (which is global across all pools) */
682 extern void spa_l2cache_add(vdev_t *vd);
683 extern void spa_l2cache_remove(vdev_t *vd);
684 extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
685 extern void spa_l2cache_activate(vdev_t *vd);
686 extern void spa_l2cache_drop(spa_t *spa);
687
688 /* scanning */
689 extern int spa_scan(spa_t *spa, pool_scan_func_t func);
690 extern int spa_scan_stop(spa_t *spa);
691 extern int spa_scrub_pause_resume(spa_t *spa, pool_scrub_cmd_t flag);
692
693 /* spa syncing */
694 extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
695 extern void spa_sync_allpools(void);
696
697 /* spa namespace global mutex */
698 extern kmutex_t spa_namespace_lock;
699
700 /*
701 * SPA configuration functions in spa_config.c
702 */
703
704 #define SPA_CONFIG_UPDATE_POOL 0
705 #define SPA_CONFIG_UPDATE_VDEVS 1
706
707 extern void spa_write_cachefile(spa_t *, boolean_t, boolean_t);
708 extern void spa_config_load(void);
709 extern nvlist_t *spa_all_configs(uint64_t *);
710 extern void spa_config_set(spa_t *spa, nvlist_t *config);
711 extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
712 int getstats);
713 extern void spa_config_update(spa_t *spa, int what);
714
715 /*
716 * Miscellaneous SPA routines in spa_misc.c
717 */
718
719 /* Namespace manipulation */
720 extern spa_t *spa_lookup(const char *name);
721 extern spa_t *spa_add(const char *name, nvlist_t *config, const char *altroot);
722 extern void spa_remove(spa_t *spa);
723 extern spa_t *spa_next(spa_t *prev);
724
725 /* Refcount functions */
726 extern void spa_open_ref(spa_t *spa, void *tag);
727 extern void spa_close(spa_t *spa, void *tag);
728 extern void spa_async_close(spa_t *spa, void *tag);
729 extern boolean_t spa_refcount_zero(spa_t *spa);
730
731 #define SCL_NONE 0x00
732 #define SCL_CONFIG 0x01
733 #define SCL_STATE 0x02
734 #define SCL_L2ARC 0x04 /* hack until L2ARC 2.0 */
735 #define SCL_ALLOC 0x08
736 #define SCL_ZIO 0x10
737 #define SCL_FREE 0x20
738 #define SCL_VDEV 0x40
739 #define SCL_LOCKS 7
740 #define SCL_ALL ((1 << SCL_LOCKS) - 1)
741 #define SCL_STATE_ALL (SCL_STATE | SCL_L2ARC | SCL_ZIO)
742
743 /* Pool configuration locks */
744 extern int spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw);
745 extern void spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw);
746 extern void spa_config_exit(spa_t *spa, int locks, void *tag);
747 extern int spa_config_held(spa_t *spa, int locks, krw_t rw);
748
749 /* Pool vdev add/remove lock */
750 extern uint64_t spa_vdev_enter(spa_t *spa);
751 extern uint64_t spa_vdev_config_enter(spa_t *spa);
752 extern void spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg,
753 int error, char *tag);
754 extern int spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error);
755
756 /* Pool vdev state change lock */
757 extern void spa_vdev_state_enter(spa_t *spa, int oplock);
758 extern int spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error);
759
760 /* Log state */
761 typedef enum spa_log_state {
762 SPA_LOG_UNKNOWN = 0, /* unknown log state */
763 SPA_LOG_MISSING, /* missing log(s) */
764 SPA_LOG_CLEAR, /* clear the log(s) */
765 SPA_LOG_GOOD, /* log(s) are good */
766 } spa_log_state_t;
767
768 extern spa_log_state_t spa_get_log_state(spa_t *spa);
769 extern void spa_set_log_state(spa_t *spa, spa_log_state_t state);
770 extern int spa_reset_logs(spa_t *spa);
771
772 /* Log claim callback */
773 extern void spa_claim_notify(zio_t *zio);
774
775 /* Accessor functions */
776 extern boolean_t spa_shutting_down(spa_t *spa);
777 extern struct dsl_pool *spa_get_dsl(spa_t *spa);
778 extern boolean_t spa_is_initializing(spa_t *spa);
779 extern boolean_t spa_indirect_vdevs_loaded(spa_t *spa);
780 extern blkptr_t *spa_get_rootblkptr(spa_t *spa);
781 extern void spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp);
782 extern void spa_altroot(spa_t *, char *, size_t);
783 extern int spa_sync_pass(spa_t *spa);
784 extern char *spa_name(spa_t *spa);
785 extern uint64_t spa_guid(spa_t *spa);
786 extern uint64_t spa_load_guid(spa_t *spa);
787 extern uint64_t spa_last_synced_txg(spa_t *spa);
788 extern uint64_t spa_first_txg(spa_t *spa);
789 extern uint64_t spa_syncing_txg(spa_t *spa);
790 extern uint64_t spa_final_dirty_txg(spa_t *spa);
791 extern uint64_t spa_version(spa_t *spa);
792 extern pool_state_t spa_state(spa_t *spa);
793 extern spa_load_state_t spa_load_state(spa_t *spa);
794 extern uint64_t spa_freeze_txg(spa_t *spa);
795 extern uint64_t spa_get_worst_case_asize(spa_t *spa, uint64_t lsize);
796 extern uint64_t spa_get_dspace(spa_t *spa);
797 extern uint64_t spa_get_checkpoint_space(spa_t *spa);
798 extern uint64_t spa_get_slop_space(spa_t *spa);
799 extern void spa_update_dspace(spa_t *spa);
800 extern uint64_t spa_version(spa_t *spa);
801 extern boolean_t spa_deflate(spa_t *spa);
802 extern metaslab_class_t *spa_normal_class(spa_t *spa);
803 extern metaslab_class_t *spa_log_class(spa_t *spa);
804 extern void spa_evicting_os_register(spa_t *, objset_t *os);
805 extern void spa_evicting_os_deregister(spa_t *, objset_t *os);
806 extern void spa_evicting_os_wait(spa_t *spa);
807 extern int spa_max_replication(spa_t *spa);
808 extern int spa_prev_software_version(spa_t *spa);
809 extern int spa_busy(void);
810 extern uint8_t spa_get_failmode(spa_t *spa);
811 extern boolean_t spa_suspended(spa_t *spa);
812 extern uint64_t spa_bootfs(spa_t *spa);
813 extern uint64_t spa_delegation(spa_t *spa);
814 extern objset_t *spa_meta_objset(spa_t *spa);
815 extern uint64_t spa_deadman_synctime(spa_t *spa);
816 extern uint64_t spa_dirty_data(spa_t *spa);
817
818 /* Miscellaneous support routines */
819 extern void spa_load_failed(spa_t *spa, const char *fmt, ...);
820 extern void spa_load_note(spa_t *spa, const char *fmt, ...);
821 extern void spa_activate_mos_feature(spa_t *spa, const char *feature,
822 dmu_tx_t *tx);
823 extern void spa_deactivate_mos_feature(spa_t *spa, const char *feature);
824 extern int spa_rename(const char *oldname, const char *newname);
825 extern spa_t *spa_by_guid(uint64_t pool_guid, uint64_t device_guid);
826 extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
827 extern char *spa_strdup(const char *);
828 extern void spa_strfree(char *);
829 extern uint64_t spa_get_random(uint64_t range);
830 extern uint64_t spa_generate_guid(spa_t *spa);
831 extern void snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp);
832 extern void spa_freeze(spa_t *spa);
833 extern int spa_change_guid(spa_t *spa);
834 extern void spa_upgrade(spa_t *spa, uint64_t version);
835 extern void spa_evict_all(void);
836 extern vdev_t *spa_lookup_by_guid(spa_t *spa, uint64_t guid,
837 boolean_t l2cache);
838 extern boolean_t spa_has_spare(spa_t *, uint64_t guid);
839 extern uint64_t dva_get_dsize_sync(spa_t *spa, const dva_t *dva);
840 extern uint64_t bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp);
841 extern uint64_t bp_get_dsize(spa_t *spa, const blkptr_t *bp);
842 extern boolean_t spa_has_slogs(spa_t *spa);
843 extern boolean_t spa_is_root(spa_t *spa);
844 extern boolean_t spa_writeable(spa_t *spa);
845 extern boolean_t spa_has_pending_synctask(spa_t *spa);
846 extern int spa_maxblocksize(spa_t *spa);
847 extern boolean_t spa_has_checkpoint(spa_t *spa);
848 extern boolean_t spa_importing_readonly_checkpoint(spa_t *spa);
849 extern boolean_t spa_suspend_async_destroy(spa_t *spa);
850 extern uint64_t spa_min_claim_txg(spa_t *spa);
851 extern void zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp);
852 extern boolean_t zfs_dva_valid(spa_t *spa, const dva_t *dva,
853 const blkptr_t *bp);
854 typedef void (*spa_remap_cb_t)(uint64_t vdev, uint64_t offset, uint64_t size,
855 void *arg);
856 extern boolean_t spa_remap_blkptr(spa_t *spa, blkptr_t *bp,
857 spa_remap_cb_t callback, void *arg);
858 extern uint64_t spa_get_last_removal_txg(spa_t *spa);
859 extern boolean_t spa_trust_config(spa_t *spa);
860 extern uint64_t spa_missing_tvds_allowed(spa_t *spa);
861 extern void spa_set_missing_tvds(spa_t *spa, uint64_t missing);
862 extern boolean_t spa_top_vdevs_spacemap_addressable(spa_t *spa);
863
864 extern int spa_mode(spa_t *spa);
865 extern uint64_t zfs_strtonum(const char *str, char **nptr);
866
867 extern char *spa_his_ievent_table[];
868
869 extern void spa_history_create_obj(spa_t *spa, dmu_tx_t *tx);
870 extern int spa_history_get(spa_t *spa, uint64_t *offset, uint64_t *len_read,
871 char *his_buf);
872 extern int spa_history_log(spa_t *spa, const char *his_buf);
873 extern int spa_history_log_nvl(spa_t *spa, nvlist_t *nvl);
874 extern void spa_history_log_version(spa_t *spa, const char *operation);
875 extern void spa_history_log_internal(spa_t *spa, const char *operation,
876 dmu_tx_t *tx, const char *fmt, ...);
877 extern void spa_history_log_internal_ds(struct dsl_dataset *ds, const char *op,
878 dmu_tx_t *tx, const char *fmt, ...);
879 extern void spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
880 dmu_tx_t *tx, const char *fmt, ...);
881
882 /* error handling */
883 struct zbookmark_phys;
884 extern void spa_log_error(spa_t *spa, zio_t *zio);
885 extern void zfs_ereport_post(const char *class, spa_t *spa, vdev_t *vd,
886 zio_t *zio, uint64_t stateoroffset, uint64_t length);
887 extern void zfs_post_remove(spa_t *spa, vdev_t *vd);
888 extern void zfs_post_state_change(spa_t *spa, vdev_t *vd);
889 extern void zfs_post_autoreplace(spa_t *spa, vdev_t *vd);
890 extern uint64_t spa_get_errlog_size(spa_t *spa);
891 extern int spa_get_errlog(spa_t *spa, void *uaddr, size_t *count);
892 extern void spa_errlog_rotate(spa_t *spa);
893 extern void spa_errlog_drain(spa_t *spa);
894 extern void spa_errlog_sync(spa_t *spa, uint64_t txg);
895 extern void spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub);
896
897 /* vdev cache */
898 extern void vdev_cache_stat_init(void);
899 extern void vdev_cache_stat_fini(void);
900
901 /* Initialization and termination */
902 extern void spa_init(int flags);
903 extern void spa_fini(void);
904 extern void spa_boot_init(void);
905
906 /* properties */
907 extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
908 extern int spa_prop_get(spa_t *spa, nvlist_t **nvp);
909 extern void spa_prop_clear_bootfs(spa_t *spa, uint64_t obj, dmu_tx_t *tx);
910 extern void spa_configfile_set(spa_t *, nvlist_t *, boolean_t);
911
912 /* asynchronous event notification */
913 extern void spa_event_notify(spa_t *spa, vdev_t *vdev, nvlist_t *hist_nvl,
914 const char *name);
915 extern sysevent_t *spa_event_create(spa_t *spa, vdev_t *vd, nvlist_t *hist_nvl,
916 const char *name);
917 extern void spa_event_post(sysevent_t *ev);
918 extern void spa_event_discard(sysevent_t *ev);
919
920 #ifdef ZFS_DEBUG
921 #define dprintf_bp(bp, fmt, ...) do { \
922 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
923 char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP); \
924 snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp)); \
925 dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf); \
926 kmem_free(__blkbuf, BP_SPRINTF_LEN); \
927 } \
928 _NOTE(CONSTCOND) } while (0)
929 #else
930 #define dprintf_bp(bp, fmt, ...)
931 #endif
932
933 extern int spa_mode_global; /* mode, e.g. FREAD | FWRITE */
934
935 #ifdef __cplusplus
936 }
937 #endif
938
939 #endif /* _SYS_SPA_H */
Unleashed OS