include/sys/spa.h

   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  * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
  26  */
  27
  28 #ifndef _SYS_SPA_H
  29 #define _SYS_SPA_H
  30
  31 #include <sys/avl.h>
  32 #include <sys/zfs_context.h>
  33 #include <sys/kstat.h>
  34 #include <sys/nvpair.h>
  35 #include <sys/sysmacros.h>
  36 #include <sys/types.h>
  37 #include <sys/fs/zfs.h>
  38
  39 #ifdef  __cplusplus
  40 extern "C" {
  41 #endif
  42
  43 /*
  44  * Forward references that lots of things need.
  45  */
  46 typedef struct spa spa_t;
  47 typedef struct vdev vdev_t;
  48 typedef struct metaslab metaslab_t;
  49 typedef struct metaslab_group metaslab_group_t;
  50 typedef struct metaslab_class metaslab_class_t;
  51 typedef struct zio zio_t;
  52 typedef struct zilog zilog_t;
  53 typedef struct spa_aux_vdev spa_aux_vdev_t;
  54 typedef struct ddt ddt_t;
  55 typedef struct ddt_entry ddt_entry_t;
  56 typedef struct zbookmark_phys zbookmark_phys_t;
  57
  58 struct dsl_pool;
  59 struct dsl_dataset;
  60
  61 /*
  62  * General-purpose 32-bit and 64-bit bitfield encodings.
  63  */
  64 #define BF32_DECODE(x, low, len)        P2PHASE((x) >> (low), 1U << (len))
  65 #define BF64_DECODE(x, low, len)        P2PHASE((x) >> (low), 1ULL << (len))
  66 #define BF32_ENCODE(x, low, len)        (P2PHASE((x), 1U << (len)) << (low))
  67 #define BF64_ENCODE(x, low, len)        (P2PHASE((x), 1ULL << (len)) << (low))
  68
  69 #define BF32_GET(x, low, len)           BF32_DECODE(x, low, len)
  70 #define BF64_GET(x, low, len)           BF64_DECODE(x, low, len)
  71
  72 #define BF32_SET(x, low, len, val) do { \
  73         ASSERT3U(val, <, 1U << (len)); \
  74         ASSERT3U(low + len, <=, 32); \
  75         (x) ^= BF32_ENCODE((x >> low) ^ (val), low, len); \
  76 _NOTE(CONSTCOND) } while (0)
  77
  78 #define BF64_SET(x, low, len, val) do { \
  79         ASSERT3U(val, <, 1ULL << (len)); \
  80         ASSERT3U(low + len, <=, 64); \
  81         ((x) ^= BF64_ENCODE((x >> low) ^ (val), low, len)); \
  82 _NOTE(CONSTCOND) } while (0)
  83
  84 #define BF32_GET_SB(x, low, len, shift, bias)   \
  85         ((BF32_GET(x, low, len) + (bias)) << (shift))
  86 #define BF64_GET_SB(x, low, len, shift, bias)   \
  87         ((BF64_GET(x, low, len) + (bias)) << (shift))
  88
  89 #define BF32_SET_SB(x, low, len, shift, bias, val) do { \
  90         ASSERT(IS_P2ALIGNED(val, 1U << shift)); \
  91         ASSERT3S((val) >> (shift), >=, bias); \
  92         BF32_SET(x, low, len, ((val) >> (shift)) - (bias)); \
  93 _NOTE(CONSTCOND) } while (0)
  94 #define BF64_SET_SB(x, low, len, shift, bias, val) do { \
  95         ASSERT(IS_P2ALIGNED(val, 1ULL << shift)); \
  96         ASSERT3S((val) >> (shift), >=, bias); \
  97         BF64_SET(x, low, len, ((val) >> (shift)) - (bias)); \
  98 _NOTE(CONSTCOND) } while (0)
  99
 100 /*
 101  * We currently support nine block sizes, from 512 bytes to 128K.
 102  * We could go higher, but the benefits are near-zero and the cost
 103  * of COWing a giant block to modify one byte would become excessive.
 104  */
 105 #define SPA_MINBLOCKSHIFT       9
 106 #define SPA_MAXBLOCKSHIFT       17
 107 #define SPA_MINBLOCKSIZE        (1ULL << SPA_MINBLOCKSHIFT)
 108 #define SPA_MAXBLOCKSIZE        (1ULL << SPA_MAXBLOCKSHIFT)
 109
 110 #define SPA_BLOCKSIZES          (SPA_MAXBLOCKSHIFT - SPA_MINBLOCKSHIFT + 1)
 111
 112 /*
 113  * Size of block to hold the configuration data (a packed nvlist)
 114  */
 115 #define SPA_CONFIG_BLOCKSIZE    (1ULL << 14)
 116
 117 /*
 118  * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
 119  * The ASIZE encoding should be at least 64 times larger (6 more bits)
 120  * to support up to 4-way RAID-Z mirror mode with worst-case gang block
 121  * overhead, three DVAs per bp, plus one more bit in case we do anything
 122  * else that expands the ASIZE.
 123  */
 124 #define SPA_LSIZEBITS           16      /* LSIZE up to 32M (2^16 * 512) */
 125 #define SPA_PSIZEBITS           16      /* PSIZE up to 32M (2^16 * 512) */
 126 #define SPA_ASIZEBITS           24      /* ASIZE up to 64 times larger  */
 127
 128 /*
 129  * All SPA data is represented by 128-bit data virtual addresses (DVAs).
 130  * The members of the dva_t should be considered opaque outside the SPA.
 131  */
 132 typedef struct dva {
 133         uint64_t        dva_word[2];
 134 } dva_t;
 135
 136 /*
 137  * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
 138  */
 139 typedef struct zio_cksum {
 140         uint64_t        zc_word[4];
 141 } zio_cksum_t;
 142
 143 /*
 144  * Each block is described by its DVAs, time of birth, checksum, etc.
 145  * The word-by-word, bit-by-bit layout of the blkptr is as follows:
 146  *
 147  *      64      56      48      40      32      24      16      8       0
 148  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 149  * 0    |               vdev1           | GRID  |         ASIZE         |
 150  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 151  * 1    |G|                      offset1                                |
 152  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 153  * 2    |               vdev2           | GRID  |         ASIZE         |
 154  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 155  * 3    |G|                      offset2                                |
 156  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 157  * 4    |               vdev3           | GRID  |         ASIZE         |
 158  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 159  * 5    |G|                      offset3                                |
 160  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 161  * 6    |BDX|lvl| type  | cksum |E| comp|    PSIZE      |     LSIZE     |
 162  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 163  * 7    |                       padding                                 |
 164  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 165  * 8    |                       padding                                 |
 166  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 167  * 9    |                       physical birth txg                      |
 168  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 169  * a    |                       logical birth txg                       |
 170  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 171  * b    |                       fill count                              |
 172  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 173  * c    |                       checksum[0]                             |
 174  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 175  * d    |                       checksum[1]                             |
 176  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 177  * e    |                       checksum[2]                             |
 178  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 179  * f    |                       checksum[3]                             |
 180  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 181  *
 182  * Legend:
 183  *
 184  * vdev         virtual device ID
 185  * offset       offset into virtual device
 186  * LSIZE        logical size
 187  * PSIZE        physical size (after compression)
 188  * ASIZE        allocated size (including RAID-Z parity and gang block headers)
 189  * GRID         RAID-Z layout information (reserved for future use)
 190  * cksum        checksum function
 191  * comp         compression function
 192  * G            gang block indicator
 193  * B            byteorder (endianness)
 194  * D            dedup
 195  * X            encryption (on version 30, which is not supported)
 196  * E            blkptr_t contains embedded data (see below)
 197  * lvl          level of indirection
 198  * type         DMU object type
 199  * phys birth   txg of block allocation; zero if same as logical birth txg
 200  * log. birth   transaction group in which the block was logically born
 201  * fill count   number of non-zero blocks under this bp
 202  * checksum[4]  256-bit checksum of the data this bp describes
 203  */
 204
 205 /*
 206  * "Embedded" blkptr_t's don't actually point to a block, instead they
 207  * have a data payload embedded in the blkptr_t itself.  See the comment
 208  * in blkptr.c for more details.
 209  *
 210  * The blkptr_t is laid out as follows:
 211  *
 212  *      64      56      48      40      32      24      16      8       0
 213  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 214  * 0    |      payload                                                  |
 215  * 1    |      payload                                                  |
 216  * 2    |      payload                                                  |
 217  * 3    |      payload                                                  |
 218  * 4    |      payload                                                  |
 219  * 5    |      payload                                                  |
 220  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 221  * 6    |BDX|lvl| type  | etype |E| comp| PSIZE|              LSIZE     |
 222  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 223  * 7    |      payload                                                  |
 224  * 8    |      payload                                                  |
 225  * 9    |      payload                                                  |
 226  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 227  * a    |                       logical birth txg                       |
 228  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 229  * b    |      payload                                                  |
 230  * c    |      payload                                                  |
 231  * d    |      payload                                                  |
 232  * e    |      payload                                                  |
 233  * f    |      payload                                                  |
 234  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 235  *
 236  * Legend:
 237  *
 238  * payload              contains the embedded data
 239  * B (byteorder)        byteorder (endianness)
 240  * D (dedup)            padding (set to zero)
 241  * X                    encryption (set to zero; see above)
 242  * E (embedded)         set to one
 243  * lvl                  indirection level
 244  * type                 DMU object type
 245  * etype                how to interpret embedded data (BP_EMBEDDED_TYPE_*)
 246  * comp                 compression function of payload
 247  * PSIZE                size of payload after compression, in bytes
 248  * LSIZE                logical size of payload, in bytes
 249  *                      note that 25 bits is enough to store the largest
 250  *                      "normal" BP's LSIZE (2^16 * 2^9) in bytes
 251  * log. birth           transaction group in which the block was logically born
 252  *
 253  * Note that LSIZE and PSIZE are stored in bytes, whereas for non-embedded
 254  * bp's they are stored in units of SPA_MINBLOCKSHIFT.
 255  * Generally, the generic BP_GET_*() macros can be used on embedded BP's.
 256  * The B, D, X, lvl, type, and comp fields are stored the same as with normal
 257  * BP's so the BP_SET_* macros can be used with them.  etype, PSIZE, LSIZE must
 258  * be set with the BPE_SET_* macros.  BP_SET_EMBEDDED() should be called before
 259  * other macros, as they assert that they are only used on BP's of the correct
 260  * "embedded-ness".
 261  */
 262
 263 #define BPE_GET_ETYPE(bp)       \
 264         (ASSERT(BP_IS_EMBEDDED(bp)), \
 265         BF64_GET((bp)->blk_prop, 40, 8))
 266 #define BPE_SET_ETYPE(bp, t)    do { \
 267         ASSERT(BP_IS_EMBEDDED(bp)); \
 268         BF64_SET((bp)->blk_prop, 40, 8, t); \
 269 _NOTE(CONSTCOND) } while (0)
 270
 271 #define BPE_GET_LSIZE(bp)       \
 272         (ASSERT(BP_IS_EMBEDDED(bp)), \
 273         BF64_GET_SB((bp)->blk_prop, 0, 25, 0, 1))
 274 #define BPE_SET_LSIZE(bp, x)    do { \
 275         ASSERT(BP_IS_EMBEDDED(bp)); \
 276         BF64_SET_SB((bp)->blk_prop, 0, 25, 0, 1, x); \
 277 _NOTE(CONSTCOND) } while (0)
 278
 279 #define BPE_GET_PSIZE(bp)       \
 280         (ASSERT(BP_IS_EMBEDDED(bp)), \
 281         BF64_GET_SB((bp)->blk_prop, 25, 7, 0, 1))
 282 #define BPE_SET_PSIZE(bp, x)    do { \
 283         ASSERT(BP_IS_EMBEDDED(bp)); \
 284         BF64_SET_SB((bp)->blk_prop, 25, 7, 0, 1, x); \
 285 _NOTE(CONSTCOND) } while (0)
 286
 287 typedef enum bp_embedded_type {
 288         BP_EMBEDDED_TYPE_DATA,
 289         BP_EMBEDDED_TYPE_RESERVED, /* Reserved for an unintegrated feature. */
 290         NUM_BP_EMBEDDED_TYPES = BP_EMBEDDED_TYPE_RESERVED
 291 } bp_embedded_type_t;
 292
 293 #define BPE_NUM_WORDS 14
 294 #define BPE_PAYLOAD_SIZE (BPE_NUM_WORDS * sizeof (uint64_t))
 295 #define BPE_IS_PAYLOADWORD(bp, wp) \
 296         ((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)
 297
 298 #define SPA_BLKPTRSHIFT 7               /* blkptr_t is 128 bytes        */
 299 #define SPA_DVAS_PER_BP 3               /* Number of DVAs in a bp       */
 300
 301 /*
 302  * A block is a hole when it has either 1) never been written to, or
 303  * 2) is zero-filled. In both cases, ZFS can return all zeroes for all reads
 304  * without physically allocating disk space. Holes are represented in the
 305  * blkptr_t structure by zeroed blk_dva. Correct checking for holes is
 306  * done through the BP_IS_HOLE macro. For holes, the logical size, level,
 307  * DMU object type, and birth times are all also stored for holes that
 308  * were written to at some point (i.e. were punched after having been filled).
 309  */
 310 typedef struct blkptr {
 311         dva_t           blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
 312         uint64_t        blk_prop;       /* size, compression, type, etc     */
 313         uint64_t        blk_pad[2];     /* Extra space for the future       */
 314         uint64_t        blk_phys_birth; /* txg when block was allocated     */
 315         uint64_t        blk_birth;      /* transaction group at birth       */
 316         uint64_t        blk_fill;       /* fill count                       */
 317         zio_cksum_t     blk_cksum;      /* 256-bit checksum                 */
 318 } blkptr_t;
 319
 320 /*
 321  * Macros to get and set fields in a bp or DVA.
 322  */
 323 #define DVA_GET_ASIZE(dva)      \
 324         BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0)
 325 #define DVA_SET_ASIZE(dva, x)   \
 326         BF64_SET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, \
 327         SPA_MINBLOCKSHIFT, 0, x)
 328
 329 #define DVA_GET_GRID(dva)       BF64_GET((dva)->dva_word[0], 24, 8)
 330 #define DVA_SET_GRID(dva, x)    BF64_SET((dva)->dva_word[0], 24, 8, x)
 331
 332 #define DVA_GET_VDEV(dva)       BF64_GET((dva)->dva_word[0], 32, 32)
 333 #define DVA_SET_VDEV(dva, x)    BF64_SET((dva)->dva_word[0], 32, 32, x)
 334
 335 #define DVA_GET_OFFSET(dva)     \
 336         BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
 337 #define DVA_SET_OFFSET(dva, x)  \
 338         BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)
 339
 340 #define DVA_GET_GANG(dva)       BF64_GET((dva)->dva_word[1], 63, 1)
 341 #define DVA_SET_GANG(dva, x)    BF64_SET((dva)->dva_word[1], 63, 1, x)
 342
 343 #define BP_GET_LSIZE(bp)        \
 344         (BP_IS_EMBEDDED(bp) ?   \
 345         (BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA ? BPE_GET_LSIZE(bp) : 0): \
 346         BF64_GET_SB((bp)->blk_prop, 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1))
 347 #define BP_SET_LSIZE(bp, x)     do { \
 348         ASSERT(!BP_IS_EMBEDDED(bp)); \
 349         BF64_SET_SB((bp)->blk_prop, \
 350             0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
 351 _NOTE(CONSTCOND) } while (0)
 352
 353 #define BP_GET_PSIZE(bp)        \
 354         (BP_IS_EMBEDDED(bp) ? 0 : \
 355         BF64_GET_SB((bp)->blk_prop, 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1))
 356 #define BP_SET_PSIZE(bp, x)     do { \
 357         ASSERT(!BP_IS_EMBEDDED(bp)); \
 358         BF64_SET_SB((bp)->blk_prop, \
 359             16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
 360 _NOTE(CONSTCOND) } while (0)
 361
 362 #define BP_GET_COMPRESS(bp)             BF64_GET((bp)->blk_prop, 32, 7)
 363 #define BP_SET_COMPRESS(bp, x)          BF64_SET((bp)->blk_prop, 32, 7, x)
 364
 365 #define BP_IS_EMBEDDED(bp)              BF64_GET((bp)->blk_prop, 39, 1)
 366 #define BP_SET_EMBEDDED(bp, x)          BF64_SET((bp)->blk_prop, 39, 1, x)
 367
 368 #define BP_GET_CHECKSUM(bp)             \
 369         (BP_IS_EMBEDDED(bp) ? ZIO_CHECKSUM_OFF : \
 370         BF64_GET((bp)->blk_prop, 40, 8))
 371 #define BP_SET_CHECKSUM(bp, x)          do { \
 372         ASSERT(!BP_IS_EMBEDDED(bp)); \
 373         BF64_SET((bp)->blk_prop, 40, 8, x); \
 374 _NOTE(CONSTCOND) } while (0)
 375
 376 #define BP_GET_TYPE(bp)                 BF64_GET((bp)->blk_prop, 48, 8)
 377 #define BP_SET_TYPE(bp, x)              BF64_SET((bp)->blk_prop, 48, 8, x)
 378
 379 #define BP_GET_LEVEL(bp)                BF64_GET((bp)->blk_prop, 56, 5)
 380 #define BP_SET_LEVEL(bp, x)             BF64_SET((bp)->blk_prop, 56, 5, x)
 381
 382 #define BP_GET_DEDUP(bp)                BF64_GET((bp)->blk_prop, 62, 1)
 383 #define BP_SET_DEDUP(bp, x)             BF64_SET((bp)->blk_prop, 62, 1, x)
 384
 385 #define BP_GET_BYTEORDER(bp)            BF64_GET((bp)->blk_prop, 63, 1)
 386 #define BP_SET_BYTEORDER(bp, x)         BF64_SET((bp)->blk_prop, 63, 1, x)
 387
 388 #define BP_PHYSICAL_BIRTH(bp)           \
 389         (BP_IS_EMBEDDED(bp) ? 0 : \
 390         (bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)
 391
 392 #define BP_SET_BIRTH(bp, logical, physical)     \
 393 {                                               \
 394         ASSERT(!BP_IS_EMBEDDED(bp));            \
 395         (bp)->blk_birth = (logical);            \
 396         (bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \
 397 }
 398
 399 #define BP_GET_FILL(bp) (BP_IS_EMBEDDED(bp) ? 1 : (bp)->blk_fill)
 400
 401 #define BP_GET_ASIZE(bp)        \
 402         (BP_IS_EMBEDDED(bp) ? 0 : \
 403         DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
 404         DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
 405         DVA_GET_ASIZE(&(bp)->blk_dva[2]))
 406
 407 #define BP_GET_UCSIZE(bp) \
 408         ((BP_GET_LEVEL(bp) > 0 || DMU_OT_IS_METADATA(BP_GET_TYPE(bp))) ? \
 409         BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp))
 410
 411 #define BP_GET_NDVAS(bp)        \
 412         (BP_IS_EMBEDDED(bp) ? 0 : \
 413         !!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
 414         !!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
 415         !!DVA_GET_ASIZE(&(bp)->blk_dva[2]))
 416
 417 #define BP_COUNT_GANG(bp)       \
 418         (BP_IS_EMBEDDED(bp) ? 0 : \
 419         (DVA_GET_GANG(&(bp)->blk_dva[0]) + \
 420         DVA_GET_GANG(&(bp)->blk_dva[1]) + \
 421         DVA_GET_GANG(&(bp)->blk_dva[2])))
 422
 423 #define DVA_EQUAL(dva1, dva2)   \
 424         ((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
 425         (dva1)->dva_word[0] == (dva2)->dva_word[0])
 426
 427 #define BP_EQUAL(bp1, bp2)      \
 428         (BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) &&    \
 429         (bp1)->blk_birth == (bp2)->blk_birth &&                 \
 430         DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) &&    \
 431         DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) &&    \
 432         DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2]))
 433
 434 #define ZIO_CHECKSUM_EQUAL(zc1, zc2) \
 435         (0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
 436         ((zc1).zc_word[1] - (zc2).zc_word[1]) | \
 437         ((zc1).zc_word[2] - (zc2).zc_word[2]) | \
 438         ((zc1).zc_word[3] - (zc2).zc_word[3])))
 439
 440 #define DVA_IS_VALID(dva)       (DVA_GET_ASIZE(dva) != 0)
 441
 442 #define ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3)   \
 443 {                                               \
 444         (zcp)->zc_word[0] = w0;                 \
 445         (zcp)->zc_word[1] = w1;                 \
 446         (zcp)->zc_word[2] = w2;                 \
 447         (zcp)->zc_word[3] = w3;                 \
 448 }
 449
 450 #define BP_IDENTITY(bp)         (ASSERT(!BP_IS_EMBEDDED(bp)), &(bp)->blk_dva[0])
 451 #define BP_IS_GANG(bp)          \
 452         (BP_IS_EMBEDDED(bp) ? B_FALSE : DVA_GET_GANG(BP_IDENTITY(bp)))
 453 #define DVA_IS_EMPTY(dva)       ((dva)->dva_word[0] == 0ULL &&  \
 454                                 (dva)->dva_word[1] == 0ULL)
 455 #define BP_IS_HOLE(bp) \
 456         (!BP_IS_EMBEDDED(bp) && DVA_IS_EMPTY(BP_IDENTITY(bp)))
 457
 458 /* BP_IS_RAIDZ(bp) assumes no block compression */
 459 #define BP_IS_RAIDZ(bp)         (DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \
 460                                 BP_GET_PSIZE(bp))
 461
 462 #define BP_ZERO(bp)                             \
 463 {                                               \
 464         (bp)->blk_dva[0].dva_word[0] = 0;       \
 465         (bp)->blk_dva[0].dva_word[1] = 0;       \
 466         (bp)->blk_dva[1].dva_word[0] = 0;       \
 467         (bp)->blk_dva[1].dva_word[1] = 0;       \
 468         (bp)->blk_dva[2].dva_word[0] = 0;       \
 469         (bp)->blk_dva[2].dva_word[1] = 0;       \
 470         (bp)->blk_prop = 0;                     \
 471         (bp)->blk_pad[0] = 0;                   \
 472         (bp)->blk_pad[1] = 0;                   \
 473         (bp)->blk_phys_birth = 0;               \
 474         (bp)->blk_birth = 0;                    \
 475         (bp)->blk_fill = 0;                     \
 476         ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0); \
 477 }
 478
 479 #ifdef _BIG_ENDIAN
 480 #define ZFS_HOST_BYTEORDER      (0ULL)
 481 #else
 482 #define ZFS_HOST_BYTEORDER      (1ULL)
 483 #endif
 484
 485 #define BP_SHOULD_BYTESWAP(bp)  (BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)
 486
 487 #define BP_SPRINTF_LEN  320
 488
 489 /*
 490  * This macro allows code sharing between zfs, libzpool, and mdb.
 491  * 'func' is either snprintf() or mdb_snprintf().
 492  * 'ws' (whitespace) can be ' ' for single-line format, '\n' for multi-line.
 493  */
 494 #define SNPRINTF_BLKPTR(func, ws, buf, size, bp, type, checksum, compress) \
 495 {                                                                       \
 496         static const char *copyname[] =                                 \
 497             { "zero", "single", "double", "triple" };                   \
 498         int len = 0;                                                    \
 499         int copies = 0;                                                 \
 500         int d;                                                          \
 501                                                                         \
 502         if (bp == NULL) {                                               \
 503                 len += func(buf + len, size - len, "<NULL>");           \
 504         } else if (BP_IS_HOLE(bp)) {                                    \
 505                 len += func(buf + len, size - len,                      \
 506                     "HOLE [L%llu %s] "                                  \
 507                     "size=%llxL birth=%lluL",                           \
 508                     (u_longlong_t)BP_GET_LEVEL(bp),                     \
 509                     type,                                               \
 510                     (u_longlong_t)BP_GET_LSIZE(bp),                     \
 511                     (u_longlong_t)bp->blk_birth);                       \
 512         } else if (BP_IS_EMBEDDED(bp)) {                                \
 513                 len = func(buf + len, size - len,                       \
 514                     "EMBEDDED [L%llu %s] et=%u %s "                     \
 515                     "size=%llxL/%llxP birth=%lluL",                     \
 516                     (u_longlong_t)BP_GET_LEVEL(bp),                     \
 517                     type,                                               \
 518                     (int)BPE_GET_ETYPE(bp),                             \
 519                     compress,                                           \
 520                     (u_longlong_t)BPE_GET_LSIZE(bp),                    \
 521                     (u_longlong_t)BPE_GET_PSIZE(bp),                    \
 522                     (u_longlong_t)bp->blk_birth);                       \
 523         } else {                                                        \
 524                 for (d = 0; d < BP_GET_NDVAS(bp); d++) {                \
 525                         const dva_t *dva = &bp->blk_dva[d];             \
 526                         if (DVA_IS_VALID(dva))                          \
 527                                 copies++;                               \
 528                         len += func(buf + len, size - len,              \
 529                             "DVA[%d]=<%llu:%llx:%llx>%c", d,            \
 530                             (u_longlong_t)DVA_GET_VDEV(dva),            \
 531                             (u_longlong_t)DVA_GET_OFFSET(dva),          \
 532                             (u_longlong_t)DVA_GET_ASIZE(dva),           \
 533                             ws);                                        \
 534                 }                                                       \
 535                 if (BP_IS_GANG(bp) &&                                   \
 536                     DVA_GET_ASIZE(&bp->blk_dva[2]) <=                   \
 537                     DVA_GET_ASIZE(&bp->blk_dva[1]) / 2)                 \
 538                         copies--;                                       \
 539                 len += func(buf + len, size - len,                      \
 540                     "[L%llu %s] %s %s %s %s %s %s%c"                    \
 541                     "size=%llxL/%llxP birth=%lluL/%lluP fill=%llu%c"    \
 542                     "cksum=%llx:%llx:%llx:%llx",                        \
 543                     (u_longlong_t)BP_GET_LEVEL(bp),                     \
 544                     type,                                               \
 545                     checksum,                                           \
 546                     compress,                                           \
 547                     BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE",            \
 548                     BP_IS_GANG(bp) ? "gang" : "contiguous",             \
 549                     BP_GET_DEDUP(bp) ? "dedup" : "unique",              \
 550                     copyname[copies],                                   \
 551                     ws,                                                 \
 552                     (u_longlong_t)BP_GET_LSIZE(bp),                     \
 553                     (u_longlong_t)BP_GET_PSIZE(bp),                     \
 554                     (u_longlong_t)bp->blk_birth,                        \
 555                     (u_longlong_t)BP_PHYSICAL_BIRTH(bp),                \
 556                     (u_longlong_t)BP_GET_FILL(bp),                      \
 557                     ws,                                                 \
 558                     (u_longlong_t)bp->blk_cksum.zc_word[0],             \
 559                     (u_longlong_t)bp->blk_cksum.zc_word[1],             \
 560                     (u_longlong_t)bp->blk_cksum.zc_word[2],             \
 561                     (u_longlong_t)bp->blk_cksum.zc_word[3]);            \
 562         }                                                               \
 563         ASSERT(len < size);                                             \
 564 }
 565
 566 #include <sys/dmu.h>
 567
 568 #define BP_GET_BUFC_TYPE(bp)                                            \
 569         (((BP_GET_LEVEL(bp) > 0) || (DMU_OT_IS_METADATA(BP_GET_TYPE(bp)))) ? \
 570         ARC_BUFC_METADATA : ARC_BUFC_DATA)
 571
 572 typedef enum spa_import_type {
 573         SPA_IMPORT_EXISTING,
 574         SPA_IMPORT_ASSEMBLE
 575 } spa_import_type_t;
 576
 577 /* state manipulation functions */
 578 extern int spa_open(const char *pool, spa_t **, void *tag);
 579 extern int spa_open_rewind(const char *pool, spa_t **, void *tag,
 580     nvlist_t *policy, nvlist_t **config);
 581 extern int spa_get_stats(const char *pool, nvlist_t **config, char *altroot,
 582     size_t buflen);
 583 extern int spa_create(const char *pool, nvlist_t *config, nvlist_t *props,
 584     nvlist_t *zplprops);
 585 extern int spa_import_rootpool(char *devpath, char *devid);
 586 extern int spa_import(char *pool, nvlist_t *config, nvlist_t *props,
 587     uint64_t flags);
 588 extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
 589 extern int spa_destroy(char *pool);
 590 extern int spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
 591     boolean_t hardforce);
 592 extern int spa_reset(char *pool);
 593 extern void spa_async_request(spa_t *spa, int flag);
 594 extern void spa_async_unrequest(spa_t *spa, int flag);
 595 extern void spa_async_suspend(spa_t *spa);
 596 extern void spa_async_resume(spa_t *spa);
 597 extern spa_t *spa_inject_addref(char *pool);
 598 extern void spa_inject_delref(spa_t *spa);
 599 extern void spa_scan_stat_init(spa_t *spa);
 600 extern int spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps);
 601
 602 #define SPA_ASYNC_CONFIG_UPDATE 0x01
 603 #define SPA_ASYNC_REMOVE        0x02
 604 #define SPA_ASYNC_PROBE         0x04
 605 #define SPA_ASYNC_RESILVER_DONE 0x08
 606 #define SPA_ASYNC_RESILVER      0x10
 607 #define SPA_ASYNC_AUTOEXPAND    0x20
 608 #define SPA_ASYNC_REMOVE_DONE   0x40
 609 #define SPA_ASYNC_REMOVE_STOP   0x80
 610
 611 /*
 612  * Controls the behavior of spa_vdev_remove().
 613  */
 614 #define SPA_REMOVE_UNSPARE      0x01
 615 #define SPA_REMOVE_DONE         0x02
 616
 617 /* device manipulation */
 618 extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot);
 619 extern int spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot,
 620     int replacing);
 621 extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid,
 622     int replace_done);
 623 extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
 624 extern boolean_t spa_vdev_remove_active(spa_t *spa);
 625 extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath);
 626 extern int spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru);
 627 extern int spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config,
 628     nvlist_t *props, boolean_t exp);
 629
 630 /* spare state (which is global across all pools) */
 631 extern void spa_spare_add(vdev_t *vd);
 632 extern void spa_spare_remove(vdev_t *vd);
 633 extern boolean_t spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt);
 634 extern void spa_spare_activate(vdev_t *vd);
 635
 636 /* L2ARC state (which is global across all pools) */
 637 extern void spa_l2cache_add(vdev_t *vd);
 638 extern void spa_l2cache_remove(vdev_t *vd);
 639 extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
 640 extern void spa_l2cache_activate(vdev_t *vd);
 641 extern void spa_l2cache_drop(spa_t *spa);
 642
 643 /* scanning */
 644 extern int spa_scan(spa_t *spa, pool_scan_func_t func);
 645 extern int spa_scan_stop(spa_t *spa);
 646
 647 /* spa syncing */
 648 extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
 649 extern void spa_sync_allpools(void);
 650
 651 extern int zfs_sync_pass_deferred_free;
 652
 653 /* spa namespace global mutex */
 654 extern kmutex_t spa_namespace_lock;
 655
 656 /*
 657  * SPA configuration functions in spa_config.c
 658  */
 659
 660 #define SPA_CONFIG_UPDATE_POOL  0
 661 #define SPA_CONFIG_UPDATE_VDEVS 1
 662
 663 extern void spa_config_sync(spa_t *, boolean_t, boolean_t);
 664 extern void spa_config_load(void);
 665 extern nvlist_t *spa_all_configs(uint64_t *);
 666 extern void spa_config_set(spa_t *spa, nvlist_t *config);
 667 extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
 668     int getstats);
 669 extern void spa_config_update(spa_t *spa, int what);
 670
 671 /*
 672  * Miscellaneous SPA routines in spa_misc.c
 673  */
 674
 675 /* Namespace manipulation */
 676 extern spa_t *spa_lookup(const char *name);
 677 extern spa_t *spa_add(const char *name, nvlist_t *config, const char *altroot);
 678 extern void spa_remove(spa_t *spa);
 679 extern spa_t *spa_next(spa_t *prev);
 680
 681 /* Refcount functions */
 682 extern void spa_open_ref(spa_t *spa, void *tag);
 683 extern void spa_close(spa_t *spa, void *tag);
 684 extern void spa_async_close(spa_t *spa, void *tag);
 685 extern boolean_t spa_refcount_zero(spa_t *spa);
 686
 687 #define SCL_NONE        0x00
 688 #define SCL_CONFIG      0x01
 689 #define SCL_STATE       0x02
 690 #define SCL_L2ARC       0x04            /* hack until L2ARC 2.0 */
 691 #define SCL_ALLOC       0x08
 692 #define SCL_ZIO         0x10
 693 #define SCL_FREE        0x20
 694 #define SCL_VDEV        0x40
 695 #define SCL_LOCKS       7
 696 #define SCL_ALL         ((1 << SCL_LOCKS) - 1)
 697 #define SCL_STATE_ALL   (SCL_STATE | SCL_L2ARC | SCL_ZIO)
 698
 699 /* Historical pool statistics */
 700 typedef struct spa_stats_history {
 701         kmutex_t                lock;
 702         uint64_t                count;
 703         uint64_t                size;
 704         kstat_t                 *kstat;
 705         void                    *private;
 706         list_t                  list;
 707 } spa_stats_history_t;
 708
 709 typedef struct spa_stats {
 710         spa_stats_history_t     read_history;
 711         spa_stats_history_t     txg_history;
 712         spa_stats_history_t     tx_assign_histogram;
 713         spa_stats_history_t     io_history;
 714 } spa_stats_t;
 715
 716 typedef enum txg_state {
 717         TXG_STATE_BIRTH         = 0,
 718         TXG_STATE_OPEN          = 1,
 719         TXG_STATE_QUIESCED      = 2,
 720         TXG_STATE_WAIT_FOR_SYNC = 3,
 721         TXG_STATE_SYNCED        = 4,
 722         TXG_STATE_COMMITTED     = 5,
 723 } txg_state_t;
 724
 725 extern void spa_stats_init(spa_t *spa);
 726 extern void spa_stats_destroy(spa_t *spa);
 727 extern void spa_read_history_add(spa_t *spa, const zbookmark_phys_t *zb,
 728     uint32_t aflags);
 729 extern void spa_txg_history_add(spa_t *spa, uint64_t txg, hrtime_t birth_time);
 730 extern int spa_txg_history_set(spa_t *spa,  uint64_t txg,
 731     txg_state_t completed_state, hrtime_t completed_time);
 732 extern int spa_txg_history_set_io(spa_t *spa,  uint64_t txg, uint64_t nread,
 733     uint64_t nwritten, uint64_t reads, uint64_t writes, uint64_t ndirty);
 734 extern void spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs);
 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_offline_log(spa_t *spa);
 764
 765 /* Log claim callback */
 766 extern void spa_claim_notify(zio_t *zio);
 767 extern void spa_deadman(void *);
 768
 769 /* Accessor functions */
 770 extern boolean_t spa_shutting_down(spa_t *spa);
 771 extern struct dsl_pool *spa_get_dsl(spa_t *spa);
 772 extern boolean_t spa_is_initializing(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_version(spa_t *spa);
 784 extern pool_state_t spa_state(spa_t *spa);
 785 extern spa_load_state_t spa_load_state(spa_t *spa);
 786 extern uint64_t spa_freeze_txg(spa_t *spa);
 787 extern uint64_t spa_get_asize(spa_t *spa, uint64_t lsize);
 788 extern uint64_t spa_get_dspace(spa_t *spa);
 789 extern void spa_update_dspace(spa_t *spa);
 790 extern uint64_t spa_version(spa_t *spa);
 791 extern boolean_t spa_deflate(spa_t *spa);
 792 extern metaslab_class_t *spa_normal_class(spa_t *spa);
 793 extern metaslab_class_t *spa_log_class(spa_t *spa);
 794 extern void spa_evicting_os_register(spa_t *, objset_t *os);
 795 extern void spa_evicting_os_deregister(spa_t *, objset_t *os);
 796 extern void spa_evicting_os_wait(spa_t *spa);
 797 extern int spa_max_replication(spa_t *spa);
 798 extern int spa_prev_software_version(spa_t *spa);
 799 extern uint8_t spa_get_failmode(spa_t *spa);
 800 extern boolean_t spa_suspended(spa_t *spa);
 801 extern uint64_t spa_bootfs(spa_t *spa);
 802 extern uint64_t spa_delegation(spa_t *spa);
 803 extern objset_t *spa_meta_objset(spa_t *spa);
 804 extern uint64_t spa_deadman_synctime(spa_t *spa);
 805
 806 /* Miscellaneous support routines */
 807 extern void spa_activate_mos_feature(spa_t *spa, const char *feature,
 808     dmu_tx_t *tx);
 809 extern void spa_deactivate_mos_feature(spa_t *spa, const char *feature);
 810 extern int spa_rename(const char *oldname, const char *newname);
 811 extern spa_t *spa_by_guid(uint64_t pool_guid, uint64_t device_guid);
 812 extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
 813 extern char *spa_strdup(const char *);
 814 extern void spa_strfree(char *);
 815 extern uint64_t spa_get_random(uint64_t range);
 816 extern uint64_t spa_generate_guid(spa_t *spa);
 817 extern void snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp);
 818 extern void spa_freeze(spa_t *spa);
 819 extern int spa_change_guid(spa_t *spa);
 820 extern void spa_upgrade(spa_t *spa, uint64_t version);
 821 extern void spa_evict_all(void);
 822 extern vdev_t *spa_lookup_by_guid(spa_t *spa, uint64_t guid,
 823     boolean_t l2cache);
 824 extern boolean_t spa_has_spare(spa_t *, uint64_t guid);
 825 extern uint64_t dva_get_dsize_sync(spa_t *spa, const dva_t *dva);
 826 extern uint64_t bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp);
 827 extern uint64_t bp_get_dsize(spa_t *spa, const blkptr_t *bp);
 828 extern boolean_t spa_has_slogs(spa_t *spa);
 829 extern boolean_t spa_is_root(spa_t *spa);
 830 extern boolean_t spa_writeable(spa_t *spa);
 831 extern boolean_t spa_has_pending_synctask(spa_t *spa);
 832
 833 extern int spa_mode(spa_t *spa);
 834 extern uint64_t strtonum(const char *str, char **nptr);
 835
 836 extern char *spa_his_ievent_table[];
 837
 838 extern void spa_history_create_obj(spa_t *spa, dmu_tx_t *tx);
 839 extern int spa_history_get(spa_t *spa, uint64_t *offset, uint64_t *len_read,
 840     char *his_buf);
 841 extern int spa_history_log(spa_t *spa, const char *his_buf);
 842 extern int spa_history_log_nvl(spa_t *spa, nvlist_t *nvl);
 843 extern void spa_history_log_version(spa_t *spa, const char *operation);
 844 extern void spa_history_log_internal(spa_t *spa, const char *operation,
 845     dmu_tx_t *tx, const char *fmt, ...);
 846 extern void spa_history_log_internal_ds(struct dsl_dataset *ds, const char *op,
 847     dmu_tx_t *tx, const char *fmt, ...);
 848 extern void spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
 849     dmu_tx_t *tx, const char *fmt, ...);
 850
 851 /* error handling */
 852 struct zbookmark_phys;
 853 extern void spa_log_error(spa_t *spa, zio_t *zio);
 854 extern void zfs_ereport_post(const char *class, spa_t *spa, vdev_t *vd,
 855     zio_t *zio, uint64_t stateoroffset, uint64_t length);
 856 extern void zfs_post_remove(spa_t *spa, vdev_t *vd);
 857 extern void zfs_post_state_change(spa_t *spa, vdev_t *vd);
 858 extern void zfs_post_autoreplace(spa_t *spa, vdev_t *vd);
 859 extern uint64_t spa_get_errlog_size(spa_t *spa);
 860 extern int spa_get_errlog(spa_t *spa, void *uaddr, size_t *count);
 861 extern void spa_errlog_rotate(spa_t *spa);
 862 extern void spa_errlog_drain(spa_t *spa);
 863 extern void spa_errlog_sync(spa_t *spa, uint64_t txg);
 864 extern void spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub);
 865
 866 /* vdev cache */
 867 extern void vdev_cache_stat_init(void);
 868 extern void vdev_cache_stat_fini(void);
 869
 870 /* Initialization and termination */
 871 extern void spa_init(int flags);
 872 extern void spa_fini(void);
 873 extern void spa_boot_init(void);
 874
 875 /* properties */
 876 extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
 877 extern int spa_prop_get(spa_t *spa, nvlist_t **nvp);
 878 extern void spa_prop_clear_bootfs(spa_t *spa, uint64_t obj, dmu_tx_t *tx);
 879 extern void spa_configfile_set(spa_t *, nvlist_t *, boolean_t);
 880
 881 /* asynchronous event notification */
 882 extern void spa_event_notify(spa_t *spa, vdev_t *vdev, const char *name);
 883
 884 #ifdef ZFS_DEBUG
 885 #define dprintf_bp(bp, fmt, ...) do {                           \
 886         if (zfs_flags & ZFS_DEBUG_DPRINTF) {                    \
 887         char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP);  \
 888         snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp));        \
 889         dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf);            \
 890         kmem_free(__blkbuf, BP_SPRINTF_LEN);                    \
 891         } \
 892 _NOTE(CONSTCOND) } while (0)
 893 #else
 894 #define dprintf_bp(bp, fmt, ...)
 895 #endif
 896
 897 extern boolean_t spa_debug_enabled(spa_t *spa);
 898 #define spa_dbgmsg(spa, ...)                    \
 899 {                                               \
 900         if (spa_debug_enabled(spa))             \
 901                 zfs_dbgmsg(__VA_ARGS__);        \
 902 }
 903
 904 extern int spa_mode_global;                     /* mode, e.g. FREAD | FWRITE */
 905
 906 #ifdef  __cplusplus
 907 }
 908 #endif
 909
 910 #endif  /* _SYS_SPA_H */