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