usr/src/uts/common/fs/zfs/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  * Copyright 2013 Saso Kiselkov. All rights reserved.
  27  */
  28
  29 #ifndef _SYS_SPA_H
  30 #define _SYS_SPA_H
  31
  32 #include <sys/avl.h>
  33 #include <sys/zfs_context.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 struct dsl_pool;
  57 struct dsl_dataset;
  58
  59 /*
  60  * General-purpose 32-bit and 64-bit bitfield encodings.
  61  */
  62 #define BF32_DECODE(x, low, len)        P2PHASE((x) >> (low), 1U << (len))
  63 #define BF64_DECODE(x, low, len)        P2PHASE((x) >> (low), 1ULL << (len))
  64 #define BF32_ENCODE(x, low, len)        (P2PHASE((x), 1U << (len)) << (low))
  65 #define BF64_ENCODE(x, low, len)        (P2PHASE((x), 1ULL << (len)) << (low))
  66
  67 #define BF32_GET(x, low, len)           BF32_DECODE(x, low, len)
  68 #define BF64_GET(x, low, len)           BF64_DECODE(x, low, len)
  69
  70 #define BF32_SET(x, low, len, val) do { \
  71         ASSERT3U(val, <, 1U << (len)); \
  72         ASSERT3U(low + len, <=, 32); \
  73         (x) ^= BF32_ENCODE((x >> low) ^ (val), low, len); \
  74 _NOTE(CONSTCOND) } while (0)
  75
  76 #define BF64_SET(x, low, len, val) do { \
  77         ASSERT3U(val, <, 1ULL << (len)); \
  78         ASSERT3U(low + len, <=, 64); \
  79         ((x) ^= BF64_ENCODE((x >> low) ^ (val), low, len)); \
  80 _NOTE(CONSTCOND) } while (0)
  81
  82 #define BF32_GET_SB(x, low, len, shift, bias)   \
  83         ((BF32_GET(x, low, len) + (bias)) << (shift))
  84 #define BF64_GET_SB(x, low, len, shift, bias)   \
  85         ((BF64_GET(x, low, len) + (bias)) << (shift))
  86
  87 #define BF32_SET_SB(x, low, len, shift, bias, val) do { \
  88         ASSERT(IS_P2ALIGNED(val, 1U << shift)); \
  89         ASSERT3S((val) >> (shift), >=, bias); \
  90         BF32_SET(x, low, len, ((val) >> (shift)) - (bias)); \
  91 _NOTE(CONSTCOND) } while (0)
  92 #define BF64_SET_SB(x, low, len, shift, bias, val) do { \
  93         ASSERT(IS_P2ALIGNED(val, 1ULL << shift)); \
  94         ASSERT3S((val) >> (shift), >=, bias); \
  95         BF64_SET(x, low, len, ((val) >> (shift)) - (bias)); \
  96 _NOTE(CONSTCOND) } while (0)
  97
  98 /*
  99  * We currently support block sizes from 512 bytes to 16MB.
 100  * The benefits of larger blocks, and thus larger IO, need to be weighed
 101  * against the cost of COWing a giant block to modify one byte, and the
 102  * large latency of reading or writing a large block.
 103  *
 104  * Note that although blocks up to 16MB are supported, the recordsize
 105  * property can not be set larger than zfs_max_recordsize (default 1MB).
 106  * See the comment near zfs_max_recordsize in dsl_dataset.c for details.
 107  *
 108  * Note that although the LSIZE field of the blkptr_t can store sizes up
 109  * to 32MB, the dnode's dn_datablkszsec can only store sizes up to
 110  * 32MB - 512 bytes.  Therefore, we limit SPA_MAXBLOCKSIZE to 16MB.
 111  */
 112 #define SPA_MINBLOCKSHIFT       9
 113 #define SPA_OLD_MAXBLOCKSHIFT   17
 114 #define SPA_MAXBLOCKSHIFT       24
 115 #define SPA_MINBLOCKSIZE        (1ULL << SPA_MINBLOCKSHIFT)
 116 #define SPA_OLD_MAXBLOCKSIZE    (1ULL << SPA_OLD_MAXBLOCKSHIFT)
 117 #define SPA_MAXBLOCKSIZE        (1ULL << SPA_MAXBLOCKSHIFT)
 118
 119 /*
 120  * Size of block to hold the configuration data (a packed nvlist)
 121  */
 122 #define SPA_CONFIG_BLOCKSIZE    (1ULL << 14)
 123
 124 /*
 125  * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
 126  * The ASIZE encoding should be at least 64 times larger (6 more bits)
 127  * to support up to 4-way RAID-Z mirror mode with worst-case gang block
 128  * overhead, three DVAs per bp, plus one more bit in case we do anything
 129  * else that expands the ASIZE.
 130  */
 131 #define SPA_LSIZEBITS           16      /* LSIZE up to 32M (2^16 * 512) */
 132 #define SPA_PSIZEBITS           16      /* PSIZE up to 32M (2^16 * 512) */
 133 #define SPA_ASIZEBITS           24      /* ASIZE up to 64 times larger  */
 134
 135 /*
 136  * All SPA data is represented by 128-bit data virtual addresses (DVAs).
 137  * The members of the dva_t should be considered opaque outside the SPA.
 138  */
 139 typedef struct dva {
 140         uint64_t        dva_word[2];
 141 } dva_t;
 142
 143 /*
 144  * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
 145  */
 146 typedef struct zio_cksum {
 147         uint64_t        zc_word[4];
 148 } zio_cksum_t;
 149
 150 /*
 151  * Some checksums/hashes need a 256-bit initialization salt. This salt is kept
 152  * secret and is suitable for use in MAC algorithms as the key.
 153  */
 154 typedef struct zio_cksum_salt {
 155         uint8_t         zcs_bytes[32];
 156 } zio_cksum_salt_t;
 157
 158 /*
 159  * Each block is described by its DVAs, time of birth, checksum, etc.
 160  * The word-by-word, bit-by-bit layout of the blkptr is as follows:
 161  *
 162  *      64      56      48      40      32      24      16      8       0
 163  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 164  * 0    |               vdev1           | GRID  |         ASIZE         |
 165  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 166  * 1    |G|                      offset1                                |
 167  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 168  * 2    |               vdev2           | GRID  |         ASIZE         |
 169  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 170  * 3    |G|                      offset2                                |
 171  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 172  * 4    |               vdev3           | GRID  |         ASIZE         |
 173  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 174  * 5    |G|                      offset3                                |
 175  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 176  * 6    |BDX|lvl| type  | cksum |E| comp|    PSIZE      |     LSIZE     |
 177  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 178  * 7    |                       padding                                 |
 179  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 180  * 8    |                       padding                                 |
 181  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 182  * 9    |                       physical birth txg                      |
 183  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 184  * a    |                       logical birth txg                       |
 185  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 186  * b    |                       fill count                              |
 187  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 188  * c    |                       checksum[0]                             |
 189  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 190  * d    |                       checksum[1]                             |
 191  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 192  * e    |                       checksum[2]                             |
 193  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 194  * f    |                       checksum[3]                             |
 195  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 196  *
 197  * Legend:
 198  *
 199  * vdev         virtual device ID
 200  * offset       offset into virtual device
 201  * LSIZE        logical size
 202  * PSIZE        physical size (after compression)
 203  * ASIZE        allocated size (including RAID-Z parity and gang block headers)
 204  * GRID         RAID-Z layout information (reserved for future use)
 205  * cksum        checksum function
 206  * comp         compression function
 207  * G            gang block indicator
 208  * B            byteorder (endianness)
 209  * D            dedup
 210  * X            encryption (on version 30, which is not supported)
 211  * E            blkptr_t contains embedded data (see below)
 212  * lvl          level of indirection
 213  * type         DMU object type
 214  * phys birth   txg of block allocation; zero if same as logical birth txg
 215  * log. birth   transaction group in which the block was logically born
 216  * fill count   number of non-zero blocks under this bp
 217  * checksum[4]  256-bit checksum of the data this bp describes
 218  */
 219
 220 /*
 221  * "Embedded" blkptr_t's don't actually point to a block, instead they
 222  * have a data payload embedded in the blkptr_t itself.  See the comment
 223  * in blkptr.c for more details.
 224  *
 225  * The blkptr_t is laid out as follows:
 226  *
 227  *      64      56      48      40      32      24      16      8       0
 228  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 229  * 0    |      payload                                                  |
 230  * 1    |      payload                                                  |
 231  * 2    |      payload                                                  |
 232  * 3    |      payload                                                  |
 233  * 4    |      payload                                                  |
 234  * 5    |      payload                                                  |
 235  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 236  * 6    |BDX|lvl| type  | etype |E| comp| PSIZE|              LSIZE     |
 237  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 238  * 7    |      payload                                                  |
 239  * 8    |      payload                                                  |
 240  * 9    |      payload                                                  |
 241  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 242  * a    |                       logical birth txg                       |
 243  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 244  * b    |      payload                                                  |
 245  * c    |      payload                                                  |
 246  * d    |      payload                                                  |
 247  * e    |      payload                                                  |
 248  * f    |      payload                                                  |
 249  *      +-------+-------+-------+-------+-------+-------+-------+-------+
 250  *
 251  * Legend:
 252  *
 253  * payload              contains the embedded data
 254  * B (byteorder)        byteorder (endianness)
 255  * D (dedup)            padding (set to zero)
 256  * X                    encryption (set to zero; see above)
 257  * E (embedded)         set to one
 258  * lvl                  indirection level
 259  * type                 DMU object type
 260  * etype                how to interpret embedded data (BP_EMBEDDED_TYPE_*)
 261  * comp                 compression function of payload
 262  * PSIZE                size of payload after compression, in bytes
 263  * LSIZE                logical size of payload, in bytes
 264  *                      note that 25 bits is enough to store the largest
 265  *                      "normal" BP's LSIZE (2^16 * 2^9) in bytes
 266  * log. birth           transaction group in which the block was logically born
 267  *
 268  * Note that LSIZE and PSIZE are stored in bytes, whereas for non-embedded
 269  * bp's they are stored in units of SPA_MINBLOCKSHIFT.
 270  * Generally, the generic BP_GET_*() macros can be used on embedded BP's.
 271  * The B, D, X, lvl, type, and comp fields are stored the same as with normal
 272  * BP's so the BP_SET_* macros can be used with them.  etype, PSIZE, LSIZE must
 273  * be set with the BPE_SET_* macros.  BP_SET_EMBEDDED() should be called before
 274  * other macros, as they assert that they are only used on BP's of the correct
 275  * "embedded-ness".
 276  */
 277
 278 #define BPE_GET_ETYPE(bp)       \
 279         (ASSERT(BP_IS_EMBEDDED(bp)), \
 280         BF64_GET((bp)->blk_prop, 40, 8))
 281 #define BPE_SET_ETYPE(bp, t)    do { \
 282         ASSERT(BP_IS_EMBEDDED(bp)); \
 283         BF64_SET((bp)->blk_prop, 40, 8, t); \
 284 _NOTE(CONSTCOND) } while (0)
 285
 286 #define BPE_GET_LSIZE(bp)       \
 287         (ASSERT(BP_IS_EMBEDDED(bp)), \
 288         BF64_GET_SB((bp)->blk_prop, 0, 25, 0, 1))
 289 #define BPE_SET_LSIZE(bp, x)    do { \
 290         ASSERT(BP_IS_EMBEDDED(bp)); \
 291         BF64_SET_SB((bp)->blk_prop, 0, 25, 0, 1, x); \
 292 _NOTE(CONSTCOND) } while (0)
 293
 294 #define BPE_GET_PSIZE(bp)       \
 295         (ASSERT(BP_IS_EMBEDDED(bp)), \
 296         BF64_GET_SB((bp)->blk_prop, 25, 7, 0, 1))
 297 #define BPE_SET_PSIZE(bp, x)    do { \
 298         ASSERT(BP_IS_EMBEDDED(bp)); \
 299         BF64_SET_SB((bp)->blk_prop, 25, 7, 0, 1, x); \
 300 _NOTE(CONSTCOND) } while (0)
 301
 302 typedef enum bp_embedded_type {
 303         BP_EMBEDDED_TYPE_DATA,
 304         BP_EMBEDDED_TYPE_RESERVED, /* Reserved for an unintegrated feature. */
 305         NUM_BP_EMBEDDED_TYPES = BP_EMBEDDED_TYPE_RESERVED
 306 } bp_embedded_type_t;
 307
 308 #define BPE_NUM_WORDS 14
 309 #define BPE_PAYLOAD_SIZE (BPE_NUM_WORDS * sizeof (uint64_t))
 310 #define BPE_IS_PAYLOADWORD(bp, wp) \
 311         ((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)
 312
 313 #define SPA_BLKPTRSHIFT 7               /* blkptr_t is 128 bytes        */
 314 #define SPA_DVAS_PER_BP 3               /* Number of DVAs in a bp       */
 315
 316 /*
 317  * A block is a hole when it has either 1) never been written to, or
 318  * 2) is zero-filled. In both cases, ZFS can return all zeroes for all reads
 319  * without physically allocating disk space. Holes are represented in the
 320  * blkptr_t structure by zeroed blk_dva. Correct checking for holes is
 321  * done through the BP_IS_HOLE macro. For holes, the logical size, level,
 322  * DMU object type, and birth times are all also stored for holes that
 323  * were written to at some point (i.e. were punched after having been filled).
 324  */
 325 typedef struct blkptr {
 326         dva_t           blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
 327         uint64_t        blk_prop;       /* size, compression, type, etc     */
 328         uint64_t        blk_pad[2];     /* Extra space for the future       */
 329         uint64_t        blk_phys_birth; /* txg when block was allocated     */
 330         uint64_t        blk_birth;      /* transaction group at birth       */
 331         uint64_t        blk_fill;       /* fill count                       */
 332         zio_cksum_t     blk_cksum;      /* 256-bit checksum                 */
 333 } blkptr_t;
 334
 335 /*
 336  * Macros to get and set fields in a bp or DVA.
 337  */
 338 #define DVA_GET_ASIZE(dva)      \
 339         BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0)
 340 #define DVA_SET_ASIZE(dva, x)   \
 341         BF64_SET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, \
 342         SPA_MINBLOCKSHIFT, 0, x)
 343
 344 #define DVA_GET_GRID(dva)       BF64_GET((dva)->dva_word[0], 24, 8)
 345 #define DVA_SET_GRID(dva, x)    BF64_SET((dva)->dva_word[0], 24, 8, x)
 346
 347 #define DVA_GET_VDEV(dva)       BF64_GET((dva)->dva_word[0], 32, 32)
 348 #define DVA_SET_VDEV(dva, x)    BF64_SET((dva)->dva_word[0], 32, 32, x)
 349
 350 #define DVA_GET_OFFSET(dva)     \
 351         BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
 352 #define DVA_SET_OFFSET(dva, x)  \
 353         BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)
 354
 355 #define DVA_GET_GANG(dva)       BF64_GET((dva)->dva_word[1], 63, 1)
 356 #define DVA_SET_GANG(dva, x)    BF64_SET((dva)->dva_word[1], 63, 1, x)
 357
 358 #define BP_GET_LSIZE(bp)        \
 359         (BP_IS_EMBEDDED(bp) ?   \
 360         (BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA ? BPE_GET_LSIZE(bp) : 0): \
 361         BF64_GET_SB((bp)->blk_prop, 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1))
 362 #define BP_SET_LSIZE(bp, x)     do { \
 363         ASSERT(!BP_IS_EMBEDDED(bp)); \
 364         BF64_SET_SB((bp)->blk_prop, \
 365             0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
 366 _NOTE(CONSTCOND) } while (0)
 367
 368 #define BP_GET_PSIZE(bp)        \
 369         (BP_IS_EMBEDDED(bp) ? 0 : \
 370         BF64_GET_SB((bp)->blk_prop, 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1))
 371 #define BP_SET_PSIZE(bp, x)     do { \
 372         ASSERT(!BP_IS_EMBEDDED(bp)); \
 373         BF64_SET_SB((bp)->blk_prop, \
 374             16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
 375 _NOTE(CONSTCOND) } while (0)
 376
 377 #define BP_GET_COMPRESS(bp)             BF64_GET((bp)->blk_prop, 32, 7)
 378 #define BP_SET_COMPRESS(bp, x)          BF64_SET((bp)->blk_prop, 32, 7, x)
 379
 380 #define BP_IS_EMBEDDED(bp)              BF64_GET((bp)->blk_prop, 39, 1)
 381 #define BP_SET_EMBEDDED(bp, x)          BF64_SET((bp)->blk_prop, 39, 1, x)
 382
 383 #define BP_GET_CHECKSUM(bp)             \
 384         (BP_IS_EMBEDDED(bp) ? ZIO_CHECKSUM_OFF : \
 385         BF64_GET((bp)->blk_prop, 40, 8))
 386 #define BP_SET_CHECKSUM(bp, x)          do { \
 387         ASSERT(!BP_IS_EMBEDDED(bp)); \
 388         BF64_SET((bp)->blk_prop, 40, 8, x); \
 389 _NOTE(CONSTCOND) } while (0)
 390
 391 #define BP_GET_TYPE(bp)                 BF64_GET((bp)->blk_prop, 48, 8)
 392 #define BP_SET_TYPE(bp, x)              BF64_SET((bp)->blk_prop, 48, 8, x)
 393
 394 #define BP_GET_LEVEL(bp)                BF64_GET((bp)->blk_prop, 56, 5)
 395 #define BP_SET_LEVEL(bp, x)             BF64_SET((bp)->blk_prop, 56, 5, x)
 396
 397 #define BP_GET_DEDUP(bp)                BF64_GET((bp)->blk_prop, 62, 1)
 398 #define BP_SET_DEDUP(bp, x)             BF64_SET((bp)->blk_prop, 62, 1, x)
 399
 400 #define BP_GET_BYTEORDER(bp)            BF64_GET((bp)->blk_prop, 63, 1)
 401 #define BP_SET_BYTEORDER(bp, x)         BF64_SET((bp)->blk_prop, 63, 1, x)
 402
 403 #define BP_PHYSICAL_BIRTH(bp)           \
 404         (BP_IS_EMBEDDED(bp) ? 0 : \
 405         (bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)
 406
 407 #define BP_SET_BIRTH(bp, logical, physical)     \
 408 {                                               \
 409         ASSERT(!BP_IS_EMBEDDED(bp));            \
 410         (bp)->blk_birth = (logical);            \
 411         (bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \
 412 }
 413
 414 #define BP_GET_FILL(bp) (BP_IS_EMBEDDED(bp) ? 1 : (bp)->blk_fill)
 415
 416 #define BP_GET_ASIZE(bp)        \
 417         (BP_IS_EMBEDDED(bp) ? 0 : \
 418         DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
 419         DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
 420         DVA_GET_ASIZE(&(bp)->blk_dva[2]))
 421
 422 #define BP_GET_UCSIZE(bp) \
 423         ((BP_GET_LEVEL(bp) > 0 || DMU_OT_IS_METADATA(BP_GET_TYPE(bp))) ? \
 424         BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp))
 425
 426 #define BP_GET_NDVAS(bp)        \
 427         (BP_IS_EMBEDDED(bp) ? 0 : \
 428         !!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
 429         !!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
 430         !!DVA_GET_ASIZE(&(bp)->blk_dva[2]))
 431
 432 #define BP_COUNT_GANG(bp)       \
 433         (BP_IS_EMBEDDED(bp) ? 0 : \
 434         (DVA_GET_GANG(&(bp)->blk_dva[0]) + \
 435         DVA_GET_GANG(&(bp)->blk_dva[1]) + \
 436         DVA_GET_GANG(&(bp)->blk_dva[2])))
 437
 438 #define DVA_EQUAL(dva1, dva2)   \
 439         ((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
 440         (dva1)->dva_word[0] == (dva2)->dva_word[0])
 441
 442 #define BP_EQUAL(bp1, bp2)      \
 443         (BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) &&    \
 444         (bp1)->blk_birth == (bp2)->blk_birth &&                 \
 445         DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) &&    \
 446         DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) &&    \
 447         DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2]))
 448
 449 #define ZIO_CHECKSUM_EQUAL(zc1, zc2) \
 450         (0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
 451         ((zc1).zc_word[1] - (zc2).zc_word[1]) | \
 452         ((zc1).zc_word[2] - (zc2).zc_word[2]) | \
 453         ((zc1).zc_word[3] - (zc2).zc_word[3])))
 454
 455 #define ZIO_CHECKSUM_IS_ZERO(zc) \
 456         (0 == ((zc)->zc_word[0] | (zc)->zc_word[1] | \
 457         (zc)->zc_word[2] | (zc)->zc_word[3]))
 458
 459 #define ZIO_CHECKSUM_BSWAP(zcp)                                 \
 460 {                                                               \
 461         (zcp)->zc_word[0] = BSWAP_64((zcp)->zc_word[0]);        \
 462         (zcp)->zc_word[1] = BSWAP_64((zcp)->zc_word[1]);        \
 463         (zcp)->zc_word[2] = BSWAP_64((zcp)->zc_word[2]);        \
 464         (zcp)->zc_word[3] = BSWAP_64((zcp)->zc_word[3]);        \
 465 }
 466
 467
 468 #define DVA_IS_VALID(dva)       (DVA_GET_ASIZE(dva) != 0)
 469
 470 #define ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3)   \
 471 {                                               \
 472         (zcp)->zc_word[0] = w0;                 \
 473         (zcp)->zc_word[1] = w1;                 \
 474         (zcp)->zc_word[2] = w2;                 \
 475         (zcp)->zc_word[3] = w3;                 \
 476 }
 477
 478 #define BP_IDENTITY(bp)         (ASSERT(!BP_IS_EMBEDDED(bp)), &(bp)->blk_dva[0])
 479 #define BP_IS_GANG(bp)          \
 480         (BP_IS_EMBEDDED(bp) ? B_FALSE : DVA_GET_GANG(BP_IDENTITY(bp)))
 481 #define DVA_IS_EMPTY(dva)       ((dva)->dva_word[0] == 0ULL &&  \
 482                                 (dva)->dva_word[1] == 0ULL)
 483 #define BP_IS_HOLE(bp) \
 484         (!BP_IS_EMBEDDED(bp) && DVA_IS_EMPTY(BP_IDENTITY(bp)))
 485
 486 /* BP_IS_RAIDZ(bp) assumes no block compression */
 487 #define BP_IS_RAIDZ(bp)         (DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \
 488                                 BP_GET_PSIZE(bp))
 489
 490 #define BP_ZERO(bp)                             \
 491 {                                               \
 492         (bp)->blk_dva[0].dva_word[0] = 0;       \
 493         (bp)->blk_dva[0].dva_word[1] = 0;       \
 494         (bp)->blk_dva[1].dva_word[0] = 0;       \
 495         (bp)->blk_dva[1].dva_word[1] = 0;       \
 496         (bp)->blk_dva[2].dva_word[0] = 0;       \
 497         (bp)->blk_dva[2].dva_word[1] = 0;       \
 498         (bp)->blk_prop = 0;                     \
 499         (bp)->blk_pad[0] = 0;                   \
 500         (bp)->blk_pad[1] = 0;                   \
 501         (bp)->blk_phys_birth = 0;               \
 502         (bp)->blk_birth = 0;                    \
 503         (bp)->blk_fill = 0;                     \
 504         ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0); \
 505 }
 506
 507 #ifdef _BIG_ENDIAN
 508 #define ZFS_HOST_BYTEORDER      (0ULL)
 509 #else
 510 #define ZFS_HOST_BYTEORDER      (1ULL)
 511 #endif
 512
 513 #define BP_SHOULD_BYTESWAP(bp)  (BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)
 514
 515 #define BP_SPRINTF_LEN  320
 516
 517 /*
 518  * This macro allows code sharing between zfs, libzpool, and mdb.
 519  * 'func' is either snprintf() or mdb_snprintf().
 520  * 'ws' (whitespace) can be ' ' for single-line format, '\n' for multi-line.
 521  */
 522 #define SNPRINTF_BLKPTR(func, ws, buf, size, bp, type, checksum, compress) \
 523 {                                                                       \
 524         static const char *copyname[] =                                 \
 525             { "zero", "single", "double", "triple" };                   \
 526         int len = 0;                                                    \
 527         int copies = 0;                                                 \
 528                                                                         \
 529         if (bp == NULL) {                                               \
 530                 len += func(buf + len, size - len, "<NULL>");           \
 531         } else if (BP_IS_HOLE(bp)) {                                    \
 532                 len += func(buf + len, size - len,                      \
 533                     "HOLE [L%llu %s] "                                  \
 534                     "size=%llxL birth=%lluL",                           \
 535                     (u_longlong_t)BP_GET_LEVEL(bp),                     \
 536                     type,                                               \
 537                     (u_longlong_t)BP_GET_LSIZE(bp),                     \
 538                     (u_longlong_t)bp->blk_birth);                       \
 539         } else if (BP_IS_EMBEDDED(bp)) {                                \
 540                 len = func(buf + len, size - len,                       \
 541                     "EMBEDDED [L%llu %s] et=%u %s "                     \
 542                     "size=%llxL/%llxP birth=%lluL",                     \
 543                     (u_longlong_t)BP_GET_LEVEL(bp),                     \
 544                     type,                                               \
 545                     (int)BPE_GET_ETYPE(bp),                             \
 546                     compress,                                           \
 547                     (u_longlong_t)BPE_GET_LSIZE(bp),                    \
 548                     (u_longlong_t)BPE_GET_PSIZE(bp),                    \
 549                     (u_longlong_t)bp->blk_birth);                       \
 550         } else {                                                        \
 551                 for (int d = 0; d < BP_GET_NDVAS(bp); d++) {            \
 552                         const dva_t *dva = &bp->blk_dva[d];             \
 553                         if (DVA_IS_VALID(dva))                          \
 554                                 copies++;                               \
 555                         len += func(buf + len, size - len,              \
 556                             "DVA[%d]=<%llu:%llx:%llx>%c", d,            \
 557                             (u_longlong_t)DVA_GET_VDEV(dva),            \
 558                             (u_longlong_t)DVA_GET_OFFSET(dva),          \
 559                             (u_longlong_t)DVA_GET_ASIZE(dva),           \
 560                             ws);                                        \
 561                 }                                                       \
 562                 if (BP_IS_GANG(bp) &&                                   \
 563                     DVA_GET_ASIZE(&bp->blk_dva[2]) <=                   \
 564                     DVA_GET_ASIZE(&bp->blk_dva[1]) / 2)                 \
 565                         copies--;                                       \
 566                 len += func(buf + len, size - len,                      \
 567                     "[L%llu %s] %s %s %s %s %s %s%c"                    \
 568                     "size=%llxL/%llxP birth=%lluL/%lluP fill=%llu%c"    \
 569                     "cksum=%llx:%llx:%llx:%llx",                        \
 570                     (u_longlong_t)BP_GET_LEVEL(bp),                     \
 571                     type,                                               \
 572                     checksum,                                           \
 573                     compress,                                           \
 574                     BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE",            \
 575                     BP_IS_GANG(bp) ? "gang" : "contiguous",             \
 576                     BP_GET_DEDUP(bp) ? "dedup" : "unique",              \
 577                     copyname[copies],                                   \
 578                     ws,                                                 \
 579                     (u_longlong_t)BP_GET_LSIZE(bp),                     \
 580                     (u_longlong_t)BP_GET_PSIZE(bp),                     \
 581                     (u_longlong_t)bp->blk_birth,                        \
 582                     (u_longlong_t)BP_PHYSICAL_BIRTH(bp),                \
 583                     (u_longlong_t)BP_GET_FILL(bp),                      \
 584                     ws,                                                 \
 585                     (u_longlong_t)bp->blk_cksum.zc_word[0],             \
 586                     (u_longlong_t)bp->blk_cksum.zc_word[1],             \
 587                     (u_longlong_t)bp->blk_cksum.zc_word[2],             \
 588                     (u_longlong_t)bp->blk_cksum.zc_word[3]);            \
 589         }                                                               \
 590         ASSERT(len < size);                                             \
 591 }
 592
 593 #include <sys/dmu.h>
 594
 595 #define BP_GET_BUFC_TYPE(bp)                                            \
 596         (((BP_GET_LEVEL(bp) > 0) || (DMU_OT_IS_METADATA(BP_GET_TYPE(bp)))) ? \
 597         ARC_BUFC_METADATA : ARC_BUFC_DATA)
 598
 599 typedef enum spa_import_type {
 600         SPA_IMPORT_EXISTING,
 601         SPA_IMPORT_ASSEMBLE
 602 } spa_import_type_t;
 603
 604 /* state manipulation functions */
 605 extern int spa_open(const char *pool, spa_t **, void *tag);
 606 extern int spa_open_rewind(const char *pool, spa_t **, void *tag,
 607     nvlist_t *policy, nvlist_t **config);
 608 extern int spa_get_stats(const char *pool, nvlist_t **config, char *altroot,
 609     size_t buflen);
 610 extern int spa_create(const char *pool, nvlist_t *config, nvlist_t *props,
 611     nvlist_t *zplprops);
 612 extern int spa_import_rootpool(char *devpath, char *devid);
 613 extern int spa_import(const char *pool, nvlist_t *config, nvlist_t *props,
 614     uint64_t flags);
 615 extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
 616 extern int spa_destroy(char *pool);
 617 extern int spa_export(char *pool, nvlist_t **oldconfig, boolean_t force,
 618     boolean_t hardforce);
 619 extern int spa_reset(char *pool);
 620 extern void spa_async_request(spa_t *spa, int flag);
 621 extern void spa_async_unrequest(spa_t *spa, int flag);
 622 extern void spa_async_suspend(spa_t *spa);
 623 extern void spa_async_resume(spa_t *spa);
 624 extern spa_t *spa_inject_addref(char *pool);
 625 extern void spa_inject_delref(spa_t *spa);
 626 extern void spa_scan_stat_init(spa_t *spa);
 627 extern int spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps);
 628
 629 #define SPA_ASYNC_CONFIG_UPDATE 0x01
 630 #define SPA_ASYNC_REMOVE        0x02
 631 #define SPA_ASYNC_PROBE         0x04
 632 #define SPA_ASYNC_RESILVER_DONE 0x08
 633 #define SPA_ASYNC_RESILVER      0x10
 634 #define SPA_ASYNC_AUTOEXPAND    0x20
 635 #define SPA_ASYNC_REMOVE_DONE   0x40
 636 #define SPA_ASYNC_REMOVE_STOP   0x80
 637
 638 /*
 639  * Controls the behavior of spa_vdev_remove().
 640  */
 641 #define SPA_REMOVE_UNSPARE      0x01
 642 #define SPA_REMOVE_DONE         0x02
 643
 644 /* device manipulation */
 645 extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot);
 646 extern int spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot,
 647     int replacing);
 648 extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid,
 649     int replace_done);
 650 extern int spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare);
 651 extern boolean_t spa_vdev_remove_active(spa_t *spa);
 652 extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath);
 653 extern int spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru);
 654 extern int spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config,
 655     nvlist_t *props, boolean_t exp);
 656
 657 /* spare state (which is global across all pools) */
 658 extern void spa_spare_add(vdev_t *vd);
 659 extern void spa_spare_remove(vdev_t *vd);
 660 extern boolean_t spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt);
 661 extern void spa_spare_activate(vdev_t *vd);
 662
 663 /* L2ARC state (which is global across all pools) */
 664 extern void spa_l2cache_add(vdev_t *vd);
 665 extern void spa_l2cache_remove(vdev_t *vd);
 666 extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
 667 extern void spa_l2cache_activate(vdev_t *vd);
 668 extern void spa_l2cache_drop(spa_t *spa);
 669
 670 /* scanning */
 671 extern int spa_scan(spa_t *spa, pool_scan_func_t func);
 672 extern int spa_scan_stop(spa_t *spa);
 673
 674 /* spa syncing */
 675 extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
 676 extern void spa_sync_allpools(void);
 677
 678 /* spa namespace global mutex */
 679 extern kmutex_t spa_namespace_lock;
 680
 681 /*
 682  * SPA configuration functions in spa_config.c
 683  */
 684
 685 #define SPA_CONFIG_UPDATE_POOL  0
 686 #define SPA_CONFIG_UPDATE_VDEVS 1
 687
 688 extern void spa_config_sync(spa_t *, boolean_t, boolean_t);
 689 extern void spa_config_load(void);
 690 extern nvlist_t *spa_all_configs(uint64_t *);
 691 extern void spa_config_set(spa_t *spa, nvlist_t *config);
 692 extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
 693     int getstats);
 694 extern void spa_config_update(spa_t *spa, int what);
 695
 696 /*
 697  * Miscellaneous SPA routines in spa_misc.c
 698  */
 699
 700 /* Namespace manipulation */
 701 extern spa_t *spa_lookup(const char *name);
 702 extern spa_t *spa_add(const char *name, nvlist_t *config, const char *altroot);
 703 extern void spa_remove(spa_t *spa);
 704 extern spa_t *spa_next(spa_t *prev);
 705
 706 /* Refcount functions */
 707 extern void spa_open_ref(spa_t *spa, void *tag);
 708 extern void spa_close(spa_t *spa, void *tag);
 709 extern void spa_async_close(spa_t *spa, void *tag);
 710 extern boolean_t spa_refcount_zero(spa_t *spa);
 711
 712 #define SCL_NONE        0x00
 713 #define SCL_CONFIG      0x01
 714 #define SCL_STATE       0x02
 715 #define SCL_L2ARC       0x04            /* hack until L2ARC 2.0 */
 716 #define SCL_ALLOC       0x08
 717 #define SCL_ZIO         0x10
 718 #define SCL_FREE        0x20
 719 #define SCL_VDEV        0x40
 720 #define SCL_LOCKS       7
 721 #define SCL_ALL         ((1 << SCL_LOCKS) - 1)
 722 #define SCL_STATE_ALL   (SCL_STATE | SCL_L2ARC | SCL_ZIO)
 723
 724 /* Pool configuration locks */
 725 extern int spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw);
 726 extern void spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw);
 727 extern void spa_config_exit(spa_t *spa, int locks, void *tag);
 728 extern int spa_config_held(spa_t *spa, int locks, krw_t rw);
 729
 730 /* Pool vdev add/remove lock */
 731 extern uint64_t spa_vdev_enter(spa_t *spa);
 732 extern uint64_t spa_vdev_config_enter(spa_t *spa);
 733 extern void spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg,
 734     int error, char *tag);
 735 extern int spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error);
 736
 737 /* Pool vdev state change lock */
 738 extern void spa_vdev_state_enter(spa_t *spa, int oplock);
 739 extern int spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error);
 740
 741 /* Log state */
 742 typedef enum spa_log_state {
 743         SPA_LOG_UNKNOWN = 0,    /* unknown log state */
 744         SPA_LOG_MISSING,        /* missing log(s) */
 745         SPA_LOG_CLEAR,          /* clear the log(s) */
 746         SPA_LOG_GOOD,           /* log(s) are good */
 747 } spa_log_state_t;
 748
 749 extern spa_log_state_t spa_get_log_state(spa_t *spa);
 750 extern void spa_set_log_state(spa_t *spa, spa_log_state_t state);
 751 extern int spa_offline_log(spa_t *spa);
 752
 753 /* Log claim callback */
 754 extern void spa_claim_notify(zio_t *zio);
 755
 756 /* Accessor functions */
 757 extern boolean_t spa_shutting_down(spa_t *spa);
 758 extern struct dsl_pool *spa_get_dsl(spa_t *spa);
 759 extern boolean_t spa_is_initializing(spa_t *spa);
 760 extern blkptr_t *spa_get_rootblkptr(spa_t *spa);
 761 extern void spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp);
 762 extern void spa_altroot(spa_t *, char *, size_t);
 763 extern int spa_sync_pass(spa_t *spa);
 764 extern char *spa_name(spa_t *spa);
 765 extern uint64_t spa_guid(spa_t *spa);
 766 extern uint64_t spa_load_guid(spa_t *spa);
 767 extern uint64_t spa_last_synced_txg(spa_t *spa);
 768 extern uint64_t spa_first_txg(spa_t *spa);
 769 extern uint64_t spa_syncing_txg(spa_t *spa);
 770 extern uint64_t spa_version(spa_t *spa);
 771 extern pool_state_t spa_state(spa_t *spa);
 772 extern spa_load_state_t spa_load_state(spa_t *spa);
 773 extern uint64_t spa_freeze_txg(spa_t *spa);
 774 extern uint64_t spa_get_asize(spa_t *spa, uint64_t lsize);
 775 extern uint64_t spa_get_dspace(spa_t *spa);
 776 extern uint64_t spa_get_slop_space(spa_t *spa);
 777 extern void spa_update_dspace(spa_t *spa);
 778 extern uint64_t spa_version(spa_t *spa);
 779 extern boolean_t spa_deflate(spa_t *spa);
 780 extern metaslab_class_t *spa_normal_class(spa_t *spa);
 781 extern metaslab_class_t *spa_log_class(spa_t *spa);
 782 extern void spa_evicting_os_register(spa_t *, objset_t *os);
 783 extern void spa_evicting_os_deregister(spa_t *, objset_t *os);
 784 extern void spa_evicting_os_wait(spa_t *spa);
 785 extern int spa_max_replication(spa_t *spa);
 786 extern int spa_prev_software_version(spa_t *spa);
 787 extern int spa_busy(void);
 788 extern uint8_t spa_get_failmode(spa_t *spa);
 789 extern boolean_t spa_suspended(spa_t *spa);
 790 extern uint64_t spa_bootfs(spa_t *spa);
 791 extern uint64_t spa_delegation(spa_t *spa);
 792 extern objset_t *spa_meta_objset(spa_t *spa);
 793 extern uint64_t spa_deadman_synctime(spa_t *spa);
 794
 795 /* Miscellaneous support routines */
 796 extern void spa_activate_mos_feature(spa_t *spa, const char *feature,
 797     dmu_tx_t *tx);
 798 extern void spa_deactivate_mos_feature(spa_t *spa, const char *feature);
 799 extern int spa_rename(const char *oldname, const char *newname);
 800 extern spa_t *spa_by_guid(uint64_t pool_guid, uint64_t device_guid);
 801 extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
 802 extern char *spa_strdup(const char *);
 803 extern void spa_strfree(char *);
 804 extern uint64_t spa_get_random(uint64_t range);
 805 extern uint64_t spa_generate_guid(spa_t *spa);
 806 extern void snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp);
 807 extern void spa_freeze(spa_t *spa);
 808 extern int spa_change_guid(spa_t *spa);
 809 extern void spa_upgrade(spa_t *spa, uint64_t version);
 810 extern void spa_evict_all(void);
 811 extern vdev_t *spa_lookup_by_guid(spa_t *spa, uint64_t guid,
 812     boolean_t l2cache);
 813 extern boolean_t spa_has_spare(spa_t *, uint64_t guid);
 814 extern uint64_t dva_get_dsize_sync(spa_t *spa, const dva_t *dva);
 815 extern uint64_t bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp);
 816 extern uint64_t bp_get_dsize(spa_t *spa, const blkptr_t *bp);
 817 extern boolean_t spa_has_slogs(spa_t *spa);
 818 extern boolean_t spa_is_root(spa_t *spa);
 819 extern boolean_t spa_writeable(spa_t *spa);
 820 extern boolean_t spa_has_pending_synctask(spa_t *spa);
 821 extern int spa_maxblocksize(spa_t *spa);
 822 extern void zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp);
 823
 824 extern int spa_mode(spa_t *spa);
 825 extern uint64_t strtonum(const char *str, char **nptr);
 826
 827 extern char *spa_his_ievent_table[];
 828
 829 extern void spa_history_create_obj(spa_t *spa, dmu_tx_t *tx);
 830 extern int spa_history_get(spa_t *spa, uint64_t *offset, uint64_t *len_read,
 831     char *his_buf);
 832 extern int spa_history_log(spa_t *spa, const char *his_buf);
 833 extern int spa_history_log_nvl(spa_t *spa, nvlist_t *nvl);
 834 extern void spa_history_log_version(spa_t *spa, const char *operation);
 835 extern void spa_history_log_internal(spa_t *spa, const char *operation,
 836     dmu_tx_t *tx, const char *fmt, ...);
 837 extern void spa_history_log_internal_ds(struct dsl_dataset *ds, const char *op,
 838     dmu_tx_t *tx, const char *fmt, ...);
 839 extern void spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
 840     dmu_tx_t *tx, const char *fmt, ...);
 841
 842 /* error handling */
 843 struct zbookmark_phys;
 844 extern void spa_log_error(spa_t *spa, zio_t *zio);
 845 extern void zfs_ereport_post(const char *class, spa_t *spa, vdev_t *vd,
 846     zio_t *zio, uint64_t stateoroffset, uint64_t length);
 847 extern void zfs_post_remove(spa_t *spa, vdev_t *vd);
 848 extern void zfs_post_state_change(spa_t *spa, vdev_t *vd);
 849 extern void zfs_post_autoreplace(spa_t *spa, vdev_t *vd);
 850 extern uint64_t spa_get_errlog_size(spa_t *spa);
 851 extern int spa_get_errlog(spa_t *spa, void *uaddr, size_t *count);
 852 extern void spa_errlog_rotate(spa_t *spa);
 853 extern void spa_errlog_drain(spa_t *spa);
 854 extern void spa_errlog_sync(spa_t *spa, uint64_t txg);
 855 extern void spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub);
 856
 857 /* vdev cache */
 858 extern void vdev_cache_stat_init(void);
 859 extern void vdev_cache_stat_fini(void);
 860
 861 /* Initialization and termination */
 862 extern void spa_init(int flags);
 863 extern void spa_fini(void);
 864 extern void spa_boot_init();
 865
 866 /* properties */
 867 extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
 868 extern int spa_prop_get(spa_t *spa, nvlist_t **nvp);
 869 extern void spa_prop_clear_bootfs(spa_t *spa, uint64_t obj, dmu_tx_t *tx);
 870 extern void spa_configfile_set(spa_t *, nvlist_t *, boolean_t);
 871
 872 /* asynchronous event notification */
 873 extern void spa_event_notify(spa_t *spa, vdev_t *vdev, const char *name);
 874
 875 #ifdef ZFS_DEBUG
 876 #define dprintf_bp(bp, fmt, ...) do {                           \
 877         if (zfs_flags & ZFS_DEBUG_DPRINTF) {                    \
 878         char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP);  \
 879         snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp));        \
 880         dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf);            \
 881         kmem_free(__blkbuf, BP_SPRINTF_LEN);                    \
 882         } \
 883 _NOTE(CONSTCOND) } while (0)
 884 #else
 885 #define dprintf_bp(bp, fmt, ...)
 886 #endif
 887
 888 extern boolean_t spa_debug_enabled(spa_t *spa);
 889 #define spa_dbgmsg(spa, ...)                    \
 890 {                                               \
 891         if (spa_debug_enabled(spa))             \
 892                 zfs_dbgmsg(__VA_ARGS__);        \
 893 }
 894
 895 extern int spa_mode_global;                     /* mode, e.g. FREAD | FWRITE */
 896
 897 #ifdef  __cplusplus
 898 }
 899 #endif
 900
 901 #endif  /* _SYS_SPA_H */