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