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 */ 325 326 /* 327 * A block is a hole when it has either 1) never been written to, or 328 * 2) is zero-filled. In both cases, ZFS can return all zeroes for all reads 329 * without physically allocating disk space. Holes are represented in the 330 * blkptr_t structure by zeroed blk_dva. Correct checking for holes is 331 * done through the BP_IS_HOLE macro. For holes, the logical size, level, 332 * DMU object type, and birth times are all also stored for holes that 333 * were written to at some point (i.e. were punched after having been filled). 334 */ 335 typedef struct blkptr { 336 dva_t blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */ 337 uint64_t blk_prop; /* size, compression, type, etc */ 338 uint64_t blk_pad[2]; /* Extra space for the future */ 339 uint64_t blk_phys_birth; /* txg when block was allocated */ 340 uint64_t blk_birth; /* transaction group at birth */ 341 uint64_t blk_fill; /* fill count */ 342 zio_cksum_t blk_cksum; /* 256-bit checksum */ 343 } blkptr_t; 344 345 /* 346 * Macros to get and set fields in a bp or DVA. 347 */ 348 #define DVA_GET_ASIZE(dva) \ 349 BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0) 350 #define DVA_SET_ASIZE(dva, x) \ 351 BF64_SET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, \ 352 SPA_MINBLOCKSHIFT, 0, x) 353 354 #define DVA_GET_GRID(dva) BF64_GET((dva)->dva_word[0], 24, 8) 355 #define DVA_SET_GRID(dva, x) BF64_SET((dva)->dva_word[0], 24, 8, x) 356 357 #define DVA_GET_VDEV(dva) BF64_GET((dva)->dva_word[0], 32, 32) 358 #define DVA_SET_VDEV(dva, x) BF64_SET((dva)->dva_word[0], 32, 32, x) 359 360 #define DVA_GET_OFFSET(dva) \ 361 BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0) 362 #define DVA_SET_OFFSET(dva, x) \ 363 BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x) 364 365 #define DVA_GET_GANG(dva) BF64_GET((dva)->dva_word[1], 63, 1) 366 #define DVA_SET_GANG(dva, x) BF64_SET((dva)->dva_word[1], 63, 1, x) 367 368 #define BP_GET_LSIZE(bp) \ 369 (BP_IS_EMBEDDED(bp) ? \ 370 (BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA ? BPE_GET_LSIZE(bp) : 0): \ 371 BF64_GET_SB((bp)->blk_prop, 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1)) 372 #define BP_SET_LSIZE(bp, x) do { \ 373 ASSERT(!BP_IS_EMBEDDED(bp)); \ 374 BF64_SET_SB((bp)->blk_prop, \ 375 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \ 376 _NOTE(CONSTCOND) } while (0) 377 378 #define BP_GET_PSIZE(bp) \ 379 (BP_IS_EMBEDDED(bp) ? 0 : \ 380 BF64_GET_SB((bp)->blk_prop, 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1)) 381 #define BP_SET_PSIZE(bp, x) do { \ 382 ASSERT(!BP_IS_EMBEDDED(bp)); \ 383 BF64_SET_SB((bp)->blk_prop, \ 384 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \ 385 _NOTE(CONSTCOND) } while (0) 386 387 #define BP_GET_COMPRESS(bp) \ 388 BF64_GET((bp)->blk_prop, 32, SPA_COMPRESSBITS) 389 #define BP_SET_COMPRESS(bp, x) \ 390 BF64_SET((bp)->blk_prop, 32, SPA_COMPRESSBITS, x) 391 392 #define BP_IS_EMBEDDED(bp) BF64_GET((bp)->blk_prop, 39, 1) 393 #define BP_SET_EMBEDDED(bp, x) BF64_SET((bp)->blk_prop, 39, 1, x) 394 395 #define BP_GET_CHECKSUM(bp) \ 396 (BP_IS_EMBEDDED(bp) ? ZIO_CHECKSUM_OFF : \ 397 BF64_GET((bp)->blk_prop, 40, 8)) 398 #define BP_SET_CHECKSUM(bp, x) do { \ 399 ASSERT(!BP_IS_EMBEDDED(bp)); \ 400 BF64_SET((bp)->blk_prop, 40, 8, x); \ 401 _NOTE(CONSTCOND) } while (0) 402 403 #define BP_GET_TYPE(bp) BF64_GET((bp)->blk_prop, 48, 8) 404 #define BP_SET_TYPE(bp, x) BF64_SET((bp)->blk_prop, 48, 8, x) 405 406 #define BP_GET_LEVEL(bp) BF64_GET((bp)->blk_prop, 56, 5) 407 #define BP_SET_LEVEL(bp, x) BF64_SET((bp)->blk_prop, 56, 5, x) 408 409 #define BP_GET_DEDUP(bp) BF64_GET((bp)->blk_prop, 62, 1) 410 #define BP_SET_DEDUP(bp, x) BF64_SET((bp)->blk_prop, 62, 1, x) 411 412 #define BP_GET_BYTEORDER(bp) BF64_GET((bp)->blk_prop, 63, 1) 413 #define BP_SET_BYTEORDER(bp, x) BF64_SET((bp)->blk_prop, 63, 1, x) 414 415 #define BP_PHYSICAL_BIRTH(bp) \ 416 (BP_IS_EMBEDDED(bp) ? 0 : \ 417 (bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth) 418 419 #define BP_SET_BIRTH(bp, logical, physical) \ 420 { \ 421 ASSERT(!BP_IS_EMBEDDED(bp)); \ 422 (bp)->blk_birth = (logical); \ 423 (bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \ 424 } 425 426 #define BP_GET_FILL(bp) (BP_IS_EMBEDDED(bp) ? 1 : (bp)->blk_fill) 427 428 #define BP_IS_METADATA(bp) \ 429 (BP_GET_LEVEL(bp) > 0 || DMU_OT_IS_METADATA(BP_GET_TYPE(bp))) 430 431 #define BP_GET_ASIZE(bp) \ 432 (BP_IS_EMBEDDED(bp) ? 0 : \ 433 DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \ 434 DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \ 435 DVA_GET_ASIZE(&(bp)->blk_dva[2])) 436 437 #define BP_GET_UCSIZE(bp) \ 438 (BP_IS_METADATA(bp) ? BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp)) 439 440 #define BP_GET_NDVAS(bp) \ 441 (BP_IS_EMBEDDED(bp) ? 0 : \ 442 !!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \ 443 !!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \ 444 !!DVA_GET_ASIZE(&(bp)->blk_dva[2])) 445 446 #define BP_COUNT_GANG(bp) \ 447 (BP_IS_EMBEDDED(bp) ? 0 : \ 448 (DVA_GET_GANG(&(bp)->blk_dva[0]) + \ 449 DVA_GET_GANG(&(bp)->blk_dva[1]) + \ 450 DVA_GET_GANG(&(bp)->blk_dva[2]))) 451 452 #define DVA_EQUAL(dva1, dva2) \ 453 ((dva1)->dva_word[1] == (dva2)->dva_word[1] && \ 454 (dva1)->dva_word[0] == (dva2)->dva_word[0]) 455 456 #define BP_EQUAL(bp1, bp2) \ 457 (BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) && \ 458 (bp1)->blk_birth == (bp2)->blk_birth && \ 459 DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) && \ 460 DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) && \ 461 DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2])) 462 463 #define ZIO_CHECKSUM_EQUAL(zc1, zc2) \ 464 (0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \ 465 ((zc1).zc_word[1] - (zc2).zc_word[1]) | \ 466 ((zc1).zc_word[2] - (zc2).zc_word[2]) | \ 467 ((zc1).zc_word[3] - (zc2).zc_word[3]))) 468 469 #define ZIO_CHECKSUM_IS_ZERO(zc) \ 470 (0 == ((zc)->zc_word[0] | (zc)->zc_word[1] | \ 471 (zc)->zc_word[2] | (zc)->zc_word[3])) 472 473 #define ZIO_CHECKSUM_BSWAP(zcp) \ 474 { \ 475 (zcp)->zc_word[0] = BSWAP_64((zcp)->zc_word[0]); \ 476 (zcp)->zc_word[1] = BSWAP_64((zcp)->zc_word[1]); \ 477 (zcp)->zc_word[2] = BSWAP_64((zcp)->zc_word[2]); \ 478 (zcp)->zc_word[3] = BSWAP_64((zcp)->zc_word[3]); \ 479 } 480 481 482 #define DVA_IS_VALID(dva) (DVA_GET_ASIZE(dva) != 0) 483 484 #define ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3) \ 485 { \ 486 (zcp)->zc_word[0] = w0; \ 487 (zcp)->zc_word[1] = w1; \ 488 (zcp)->zc_word[2] = w2; \ 489 (zcp)->zc_word[3] = w3; \ 490 } 491 492 #define BP_IDENTITY(bp) (ASSERT(!BP_IS_EMBEDDED(bp)), &(bp)->blk_dva[0]) 493 #define BP_IS_GANG(bp) \ 494 (BP_IS_EMBEDDED(bp) ? B_FALSE : DVA_GET_GANG(BP_IDENTITY(bp))) 495 #define DVA_IS_EMPTY(dva) ((dva)->dva_word[0] == 0ULL && \ 496 (dva)->dva_word[1] == 0ULL) 497 #define BP_IS_HOLE(bp) \ 498 (!BP_IS_EMBEDDED(bp) && DVA_IS_EMPTY(BP_IDENTITY(bp))) 499 500 /* BP_IS_RAIDZ(bp) assumes no block compression */ 501 #define BP_IS_RAIDZ(bp) (DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \ 502 BP_GET_PSIZE(bp)) 503 504 #define BP_ZERO(bp) \ 505 { \ 506 (bp)->blk_dva[0].dva_word[0] = 0; \ 507 (bp)->blk_dva[0].dva_word[1] = 0; \ 508 (bp)->blk_dva[1].dva_word[0] = 0; \ 509 (bp)->blk_dva[1].dva_word[1] = 0; \ 510 (bp)->blk_dva[2].dva_word[0] = 0; \ 511 (bp)->blk_dva[2].dva_word[1] = 0; \ 512 (bp)->blk_prop = 0; \ 513 (bp)->blk_pad[0] = 0; \ 514 (bp)->blk_pad[1] = 0; \ 515 (bp)->blk_phys_birth = 0; \ 516 (bp)->blk_birth = 0; \ 517 (bp)->blk_fill = 0; \ 518 ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0); \ 519 } 520 521 #ifdef _BIG_ENDIAN 522 #define ZFS_HOST_BYTEORDER (0ULL) 523 #else 524 #define ZFS_HOST_BYTEORDER (1ULL) 525 #endif 526 527 #define BP_SHOULD_BYTESWAP(bp) (BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER) 528 529 #define BP_SPRINTF_LEN 320 530 531 /* 532 * This macro allows code sharing between zfs, libzpool, and mdb. 533 * 'func' is either snprintf() or mdb_snprintf(). 534 * 'ws' (whitespace) can be ' ' for single-line format, '\n' for multi-line. 535 */ 536 #define SNPRINTF_BLKPTR(func, ws, buf, size, bp, type, checksum, compress) \ 537 { \ 538 static const char *copyname[] = \ 539 { "zero", "single", "double", "triple" }; \ 540 int len = 0; \ 541 int copies = 0; \ 542 \ 543 if (bp == NULL) { \ 544 len += func(buf + len, size - len, "<NULL>"); \ 545 } else if (BP_IS_HOLE(bp)) { \ 546 len += func(buf + len, size - len, \ 547 "HOLE [L%llu %s] " \ 548 "size=%llxL birth=%lluL", \ 549 (u_longlong_t)BP_GET_LEVEL(bp), \ 550 type, \ 551 (u_longlong_t)BP_GET_LSIZE(bp), \ 552 (u_longlong_t)bp->blk_birth); \ 553 } else if (BP_IS_EMBEDDED(bp)) { \ 554 len = func(buf + len, size - len, \ 555 "EMBEDDED [L%llu %s] et=%u %s " \ 556 "size=%llxL/%llxP birth=%lluL", \ 557 (u_longlong_t)BP_GET_LEVEL(bp), \ 558 type, \ 559 (int)BPE_GET_ETYPE(bp), \ 560 compress, \ 561 (u_longlong_t)BPE_GET_LSIZE(bp), \ 562 (u_longlong_t)BPE_GET_PSIZE(bp), \ 563 (u_longlong_t)bp->blk_birth); \ 564 } else { \ 565 for (int d = 0; d < BP_GET_NDVAS(bp); d++) { \ 566 const dva_t *dva = &bp->blk_dva[d]; \ 567 if (DVA_IS_VALID(dva)) \ 568 copies++; \ 569 len += func(buf + len, size - len, \ 570 "DVA[%d]=<%llu:%llx:%llx>%c", d, \ 571 (u_longlong_t)DVA_GET_VDEV(dva), \ 572 (u_longlong_t)DVA_GET_OFFSET(dva), \ 573 (u_longlong_t)DVA_GET_ASIZE(dva), \ 574 ws); \ 575 } \ 576 if (BP_IS_GANG(bp) && \ 577 DVA_GET_ASIZE(&bp->blk_dva[2]) <= \ 578 DVA_GET_ASIZE(&bp->blk_dva[1]) / 2) \ 579 copies--; \ 580 len += func(buf + len, size - len, \ 581 "[L%llu %s] %s %s %s %s %s %s%c" \ 582 "size=%llxL/%llxP birth=%lluL/%lluP fill=%llu%c" \ 583 "cksum=%llx:%llx:%llx:%llx", \ 584 (u_longlong_t)BP_GET_LEVEL(bp), \ 585 type, \ 586 checksum, \ 587 compress, \ 588 BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE", \ 589 BP_IS_GANG(bp) ? "gang" : "contiguous", \ 590 BP_GET_DEDUP(bp) ? "dedup" : "unique", \ 591 copyname[copies], \ 592 ws, \ 593 (u_longlong_t)BP_GET_LSIZE(bp), \ 594 (u_longlong_t)BP_GET_PSIZE(bp), \ 595 (u_longlong_t)bp->blk_birth, \ 596 (u_longlong_t)BP_PHYSICAL_BIRTH(bp), \ 597 (u_longlong_t)BP_GET_FILL(bp), \ 598 ws, \ 599 (u_longlong_t)bp->blk_cksum.zc_word[0], \ 600 (u_longlong_t)bp->blk_cksum.zc_word[1], \ 601 (u_longlong_t)bp->blk_cksum.zc_word[2], \ 602 (u_longlong_t)bp->blk_cksum.zc_word[3]); \ 603 } \ 604 ASSERT(len < size); \ 605 } 606 607 #define BP_GET_BUFC_TYPE(bp) \ 608 (BP_IS_METADATA(bp) ? ARC_BUFC_METADATA : ARC_BUFC_DATA) 609 610 typedef enum spa_import_type { 611 SPA_IMPORT_EXISTING, 612 SPA_IMPORT_ASSEMBLE 613 } spa_import_type_t; 614 615 /* state manipulation functions */ 616 extern int spa_open(const char *pool, spa_t **, void *tag); 617 extern int spa_open_rewind(const char *pool, spa_t **, void *tag, 618 nvlist_t *policy, nvlist_t **config); 619 extern int spa_get_stats(const char *pool, nvlist_t **config, char *altroot, 620 size_t buflen); 621 extern int spa_create(const char *pool, nvlist_t *config, nvlist_t *props, 622 nvlist_t *zplprops); 623 extern int spa_import_rootpool(char *devpath, char *devid); 624 extern int spa_import(const char *pool, nvlist_t *config, nvlist_t *props, 625 uint64_t flags); 626 extern nvlist_t *spa_tryimport(nvlist_t *tryconfig); 627 extern int spa_destroy(char *pool); 628 extern int spa_export(char *pool, nvlist_t **oldconfig, boolean_t force, 629 boolean_t hardforce); 630 extern int spa_reset(char *pool); 631 extern void spa_async_request(spa_t *spa, int flag); 632 extern void spa_async_unrequest(spa_t *spa, int flag); 633 extern void spa_async_suspend(spa_t *spa); 634 extern void spa_async_resume(spa_t *spa); 635 extern spa_t *spa_inject_addref(char *pool); 636 extern void spa_inject_delref(spa_t *spa); 637 extern void spa_scan_stat_init(spa_t *spa); 638 extern int spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps); 639 640 #define SPA_ASYNC_CONFIG_UPDATE 0x01 641 #define SPA_ASYNC_REMOVE 0x02 642 #define SPA_ASYNC_PROBE 0x04 643 #define SPA_ASYNC_RESILVER_DONE 0x08 644 #define SPA_ASYNC_RESILVER 0x10 645 #define SPA_ASYNC_AUTOEXPAND 0x20 646 #define SPA_ASYNC_REMOVE_DONE 0x40 647 #define SPA_ASYNC_REMOVE_STOP 0x80 648 649 /* 650 * Controls the behavior of spa_vdev_remove(). 651 */ 652 #define SPA_REMOVE_UNSPARE 0x01 653 #define SPA_REMOVE_DONE 0x02 654 655 /* device manipulation */ 656 extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot); 657 extern int spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, 658 int replacing); 659 extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, 660 int replace_done); 661 extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare); 662 extern boolean_t spa_vdev_remove_active(spa_t *spa); 663 extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath); 664 extern int spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru); 665 extern int spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config, 666 nvlist_t *props, boolean_t exp); 667 668 /* spare state (which is global across all pools) */ 669 extern void spa_spare_add(vdev_t *vd); 670 extern void spa_spare_remove(vdev_t *vd); 671 extern boolean_t spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt); 672 extern void spa_spare_activate(vdev_t *vd); 673 674 /* L2ARC state (which is global across all pools) */ 675 extern void spa_l2cache_add(vdev_t *vd); 676 extern void spa_l2cache_remove(vdev_t *vd); 677 extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool); 678 extern void spa_l2cache_activate(vdev_t *vd); 679 extern void spa_l2cache_drop(spa_t *spa); 680 681 /* scanning */ 682 extern int spa_scan(spa_t *spa, pool_scan_func_t func); 683 extern int spa_scan_stop(spa_t *spa); 684 extern int spa_scrub_pause_resume(spa_t *spa, pool_scrub_cmd_t flag); 685 686 /* spa syncing */ 687 extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */ 688 extern void spa_sync_allpools(void); 689 690 /* spa namespace global mutex */ 691 extern kmutex_t spa_namespace_lock; 692 693 /* 694 * SPA configuration functions in spa_config.c 695 */ 696 697 #define SPA_CONFIG_UPDATE_POOL 0 698 #define SPA_CONFIG_UPDATE_VDEVS 1 699 700 extern void spa_write_cachefile(spa_t *, boolean_t, boolean_t); 701 extern void spa_config_load(void); 702 extern nvlist_t *spa_all_configs(uint64_t *); 703 extern void spa_config_set(spa_t *spa, nvlist_t *config); 704 extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg, 705 int getstats); 706 extern void spa_config_update(spa_t *spa, int what); 707 708 /* 709 * Miscellaneous SPA routines in spa_misc.c 710 */ 711 712 /* Namespace manipulation */ 713 extern spa_t *spa_lookup(const char *name); 714 extern spa_t *spa_add(const char *name, nvlist_t *config, const char *altroot); 715 extern void spa_remove(spa_t *spa); 716 extern spa_t *spa_next(spa_t *prev); 717 718 /* Refcount functions */ 719 extern void spa_open_ref(spa_t *spa, void *tag); 720 extern void spa_close(spa_t *spa, void *tag); 721 extern void spa_async_close(spa_t *spa, void *tag); 722 extern boolean_t spa_refcount_zero(spa_t *spa); 723 724 #define SCL_NONE 0x00 725 #define SCL_CONFIG 0x01 726 #define SCL_STATE 0x02 727 #define SCL_L2ARC 0x04 /* hack until L2ARC 2.0 */ 728 #define SCL_ALLOC 0x08 729 #define SCL_ZIO 0x10 730 #define SCL_FREE 0x20 731 #define SCL_VDEV 0x40 732 #define SCL_LOCKS 7 733 #define SCL_ALL ((1 << SCL_LOCKS) - 1) 734 #define SCL_STATE_ALL (SCL_STATE | SCL_L2ARC | SCL_ZIO) 735 736 /* Pool configuration locks */ 737 extern int spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw); 738 extern void spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw); 739 extern void spa_config_exit(spa_t *spa, int locks, void *tag); 740 extern int spa_config_held(spa_t *spa, int locks, krw_t rw); 741 742 /* Pool vdev add/remove lock */ 743 extern uint64_t spa_vdev_enter(spa_t *spa); 744 extern uint64_t spa_vdev_config_enter(spa_t *spa); 745 extern void spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, 746 int error, char *tag); 747 extern int spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error); 748 749 /* Pool vdev state change lock */ 750 extern void spa_vdev_state_enter(spa_t *spa, int oplock); 751 extern int spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error); 752 753 /* Log state */ 754 typedef enum spa_log_state { 755 SPA_LOG_UNKNOWN = 0, /* unknown log state */ 756 SPA_LOG_MISSING, /* missing log(s) */ 757 SPA_LOG_CLEAR, /* clear the log(s) */ 758 SPA_LOG_GOOD, /* log(s) are good */ 759 } spa_log_state_t; 760 761 extern spa_log_state_t spa_get_log_state(spa_t *spa); 762 extern void spa_set_log_state(spa_t *spa, spa_log_state_t state); 763 extern int spa_reset_logs(spa_t *spa); 764 765 /* Log claim callback */ 766 extern void spa_claim_notify(zio_t *zio); 767 768 /* Accessor functions */ 769 extern boolean_t spa_shutting_down(spa_t *spa); 770 extern struct dsl_pool *spa_get_dsl(spa_t *spa); 771 extern boolean_t spa_is_initializing(spa_t *spa); 772 extern boolean_t spa_indirect_vdevs_loaded(spa_t *spa); 773 extern blkptr_t *spa_get_rootblkptr(spa_t *spa); 774 extern void spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp); 775 extern void spa_altroot(spa_t *, char *, size_t); 776 extern int spa_sync_pass(spa_t *spa); 777 extern char *spa_name(spa_t *spa); 778 extern uint64_t spa_guid(spa_t *spa); 779 extern uint64_t spa_load_guid(spa_t *spa); 780 extern uint64_t spa_last_synced_txg(spa_t *spa); 781 extern uint64_t spa_first_txg(spa_t *spa); 782 extern uint64_t spa_syncing_txg(spa_t *spa); 783 extern uint64_t spa_final_dirty_txg(spa_t *spa); 784 extern uint64_t spa_version(spa_t *spa); 785 extern pool_state_t spa_state(spa_t *spa); 786 extern spa_load_state_t spa_load_state(spa_t *spa); 787 extern uint64_t spa_freeze_txg(spa_t *spa); 788 extern uint64_t spa_get_worst_case_asize(spa_t *spa, uint64_t lsize); 789 extern uint64_t spa_get_dspace(spa_t *spa); 790 extern uint64_t spa_get_slop_space(spa_t *spa); 791 extern void spa_update_dspace(spa_t *spa); 792 extern uint64_t spa_version(spa_t *spa); 793 extern boolean_t spa_deflate(spa_t *spa); 794 extern metaslab_class_t *spa_normal_class(spa_t *spa); 795 extern metaslab_class_t *spa_log_class(spa_t *spa); 796 extern void spa_evicting_os_register(spa_t *, objset_t *os); 797 extern void spa_evicting_os_deregister(spa_t *, objset_t *os); 798 extern void spa_evicting_os_wait(spa_t *spa); 799 extern int spa_max_replication(spa_t *spa); 800 extern int spa_prev_software_version(spa_t *spa); 801 extern int spa_busy(void); 802 extern uint8_t spa_get_failmode(spa_t *spa); 803 extern boolean_t spa_suspended(spa_t *spa); 804 extern uint64_t spa_bootfs(spa_t *spa); 805 extern uint64_t spa_delegation(spa_t *spa); 806 extern objset_t *spa_meta_objset(spa_t *spa); 807 extern uint64_t spa_deadman_synctime(spa_t *spa); 808 809 /* Miscellaneous support routines */ 810 extern void spa_activate_mos_feature(spa_t *spa, const char *feature, 811 dmu_tx_t *tx); 812 extern void spa_deactivate_mos_feature(spa_t *spa, const char *feature); 813 extern int spa_rename(const char *oldname, const char *newname); 814 extern spa_t *spa_by_guid(uint64_t pool_guid, uint64_t device_guid); 815 extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid); 816 extern char *spa_strdup(const char *); 817 extern void spa_strfree(char *); 818 extern uint64_t spa_get_random(uint64_t range); 819 extern uint64_t spa_generate_guid(spa_t *spa); 820 extern void snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp); 821 extern void spa_freeze(spa_t *spa); 822 extern int spa_change_guid(spa_t *spa); 823 extern void spa_upgrade(spa_t *spa, uint64_t version); 824 extern void spa_evict_all(void); 825 extern vdev_t *spa_lookup_by_guid(spa_t *spa, uint64_t guid, 826 boolean_t l2cache); 827 extern boolean_t spa_has_spare(spa_t *, uint64_t guid); 828 extern uint64_t dva_get_dsize_sync(spa_t *spa, const dva_t *dva); 829 extern uint64_t bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp); 830 extern uint64_t bp_get_dsize(spa_t *spa, const blkptr_t *bp); 831 extern boolean_t spa_has_slogs(spa_t *spa); 832 extern boolean_t spa_is_root(spa_t *spa); 833 extern boolean_t spa_writeable(spa_t *spa); 834 extern boolean_t spa_has_pending_synctask(spa_t *spa); 835 extern int spa_maxblocksize(spa_t *spa); 836 extern void zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp); 837 typedef void (*spa_remap_cb_t)(uint64_t vdev, uint64_t offset, uint64_t size, 838 void *arg); 839 extern boolean_t spa_remap_blkptr(spa_t *spa, blkptr_t *bp, 840 spa_remap_cb_t callback, void *arg); 841 extern uint64_t spa_get_last_removal_txg(spa_t *spa); 842 843 extern int spa_mode(spa_t *spa); 844 extern uint64_t zfs_strtonum(const char *str, char **nptr); 845 846 extern char *spa_his_ievent_table[]; 847 848 extern void spa_history_create_obj(spa_t *spa, dmu_tx_t *tx); 849 extern int spa_history_get(spa_t *spa, uint64_t *offset, uint64_t *len_read, 850 char *his_buf); 851 extern int spa_history_log(spa_t *spa, const char *his_buf); 852 extern int spa_history_log_nvl(spa_t *spa, nvlist_t *nvl); 853 extern void spa_history_log_version(spa_t *spa, const char *operation); 854 extern void spa_history_log_internal(spa_t *spa, const char *operation, 855 dmu_tx_t *tx, const char *fmt, ...); 856 extern void spa_history_log_internal_ds(struct dsl_dataset *ds, const char *op, 857 dmu_tx_t *tx, const char *fmt, ...); 858 extern void spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation, 859 dmu_tx_t *tx, const char *fmt, ...); 860 861 /* error handling */ 862 struct zbookmark_phys; 863 extern void spa_log_error(spa_t *spa, zio_t *zio); 864 extern void zfs_ereport_post(const char *class, spa_t *spa, vdev_t *vd, 865 zio_t *zio, uint64_t stateoroffset, uint64_t length); 866 extern void zfs_post_remove(spa_t *spa, vdev_t *vd); 867 extern void zfs_post_state_change(spa_t *spa, vdev_t *vd); 868 extern void zfs_post_autoreplace(spa_t *spa, vdev_t *vd); 869 extern uint64_t spa_get_errlog_size(spa_t *spa); 870 extern int spa_get_errlog(spa_t *spa, void *uaddr, size_t *count); 871 extern void spa_errlog_rotate(spa_t *spa); 872 extern void spa_errlog_drain(spa_t *spa); 873 extern void spa_errlog_sync(spa_t *spa, uint64_t txg); 874 extern void spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub); 875 876 /* vdev cache */ 877 extern void vdev_cache_stat_init(void); 878 extern void vdev_cache_stat_fini(void); 879 880 /* Initialization and termination */ 881 extern void spa_init(int flags); 882 extern void spa_fini(void); 883 extern void spa_boot_init(void); 884 885 /* properties */ 886 extern int spa_prop_set(spa_t *spa, nvlist_t *nvp); 887 extern int spa_prop_get(spa_t *spa, nvlist_t **nvp); 888 extern void spa_prop_clear_bootfs(spa_t *spa, uint64_t obj, dmu_tx_t *tx); 889 extern void spa_configfile_set(spa_t *, nvlist_t *, boolean_t); 890 891 /* asynchronous event notification */ 892 extern void spa_event_notify(spa_t *spa, vdev_t *vdev, nvlist_t *hist_nvl, 893 const char *name); 894 extern sysevent_t *spa_event_create(spa_t *spa, vdev_t *vd, nvlist_t *hist_nvl, 895 const char *name); 896 extern void spa_event_post(sysevent_t *ev); 897 extern void spa_event_discard(sysevent_t *ev); 898 899 #ifdef ZFS_DEBUG 900 #define dprintf_bp(bp, fmt, ...) do { \ 901 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \ 902 char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP); \ 903 snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp)); \ 904 dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf); \ 905 kmem_free(__blkbuf, BP_SPRINTF_LEN); \ 906 } \ 907 _NOTE(CONSTCOND) } while (0) 908 #else 909 #define dprintf_bp(bp, fmt, ...) 910 #endif 911 912 extern boolean_t spa_debug_enabled(spa_t *spa); 913 #define spa_dbgmsg(spa, ...) \ 914 { \ 915 if (spa_debug_enabled(spa)) \ 916 zfs_dbgmsg(__VA_ARGS__); \ 917 } 918 919 extern int spa_mode_global; /* mode, e.g. FREAD | FWRITE */ 920 921 #ifdef __cplusplus 922 } 923 #endif 924 925 #endif /* _SYS_SPA_H */ 926