FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/spa.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
     * Copyright (c) 2011, 2021 by Delphix. All rights reserved.
     * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
     * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
     * Copyright 2013 Saso Kiselkov. All rights reserved.
     * Copyright (c) 2014 Integros [integros.com]
     * Copyright 2017 Joyent, Inc.
     * Copyright (c) 2017, Intel Corporation.
     * Copyright (c) 2019, Allan Jude
     * Copyright (c) 2019, Klara Inc.
     * Copyright (c) 2019, Datto Inc.
     */
    
    #ifndef _SYS_SPA_H
    #define _SYS_SPA_H
    
    #include <sys/avl.h>
    #include <sys/zfs_context.h>
    #include <sys/kstat.h>
    #include <sys/nvpair.h>
    #include <sys/sysmacros.h>
    #include <sys/types.h>
    #include <sys/fs/zfs.h>
    #include <sys/spa_checksum.h>
    #include <sys/dmu.h>
    #include <sys/space_map.h>
    #include <sys/bitops.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    /*
     * Forward references that lots of things need.
     */
    typedef struct spa spa_t;
    typedef struct vdev vdev_t;
    typedef struct metaslab metaslab_t;
    typedef struct metaslab_group metaslab_group_t;
    typedef struct metaslab_class metaslab_class_t;
    typedef struct zio zio_t;
    typedef struct zilog zilog_t;
    typedef struct spa_aux_vdev spa_aux_vdev_t;
    typedef struct ddt ddt_t;
    typedef struct ddt_entry ddt_entry_t;
    typedef struct zbookmark_phys zbookmark_phys_t;
    
    struct bpobj;
    struct bplist;
    struct dsl_pool;
    struct dsl_dataset;
    struct dsl_crypto_params;
    
    /*
     * Alignment Shift (ashift) is an immutable, internal top-level vdev property
     * which can only be set at vdev creation time. Physical writes are always done
     * according to it, which makes 2^ashift the smallest possible IO on a vdev.
     *
     * We currently allow values ranging from 512 bytes (2^9 = 512) to 64 KiB
     * (2^16 = 65,536).
     */
    #define ASHIFT_MIN              9
    #define ASHIFT_MAX              16
    
    /*
     * Size of block to hold the configuration data (a packed nvlist)
     */
    #define SPA_CONFIG_BLOCKSIZE    (1ULL << 14)
    
    /*
     * The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
     * The ASIZE encoding should be at least 64 times larger (6 more bits)
     * to support up to 4-way RAID-Z mirror mode with worst-case gang block
     * overhead, three DVAs per bp, plus one more bit in case we do anything
     * else that expands the ASIZE.
     */
    #define SPA_LSIZEBITS           16      /* LSIZE up to 32M (2^16 * 512) */
    #define SPA_PSIZEBITS           16      /* PSIZE up to 32M (2^16 * 512) */
   #define SPA_ASIZEBITS           24      /* ASIZE up to 64 times larger  */
   
   #define SPA_COMPRESSBITS        7
   #define SPA_VDEVBITS            24
   #define SPA_COMPRESSMASK        ((1U << SPA_COMPRESSBITS) - 1)
   
   /*
    * All SPA data is represented by 128-bit data virtual addresses (DVAs).
    * The members of the dva_t should be considered opaque outside the SPA.
    */
   typedef struct dva {
           uint64_t        dva_word[2];
   } dva_t;
   
   
   /*
    * Some checksums/hashes need a 256-bit initialization salt. This salt is kept
    * secret and is suitable for use in MAC algorithms as the key.
    */
   typedef struct zio_cksum_salt {
           uint8_t         zcs_bytes[32];
   } zio_cksum_salt_t;
   
   /*
    * Each block is described by its DVAs, time of birth, checksum, etc.
    * The word-by-word, bit-by-bit layout of the blkptr is as follows:
    *
    *      64      56      48      40      32      24      16      8       0
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 0    |  pad  |         vdev1         | GRID  |         ASIZE         |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 1    |G|                      offset1                                |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 2    |  pad  |         vdev2         | GRID  |         ASIZE         |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 3    |G|                      offset2                                |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 4    |  pad  |         vdev3         | GRID  |         ASIZE         |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 5    |G|                      offset3                                |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 6    |BDX|lvl| type  | cksum |E| comp|    PSIZE      |     LSIZE     |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 7    |                       padding                                 |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 8    |                       padding                                 |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 9    |                       physical birth txg                      |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * a    |                       logical birth txg                       |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * b    |                       fill count                              |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * c    |                       checksum[0]                             |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * d    |                       checksum[1]                             |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * e    |                       checksum[2]                             |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * f    |                       checksum[3]                             |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    *
    * Legend:
    *
    * vdev         virtual device ID
    * offset       offset into virtual device
    * LSIZE        logical size
    * PSIZE        physical size (after compression)
    * ASIZE        allocated size (including RAID-Z parity and gang block headers)
    * GRID         RAID-Z layout information (reserved for future use)
    * cksum        checksum function
    * comp         compression function
    * G            gang block indicator
    * B            byteorder (endianness)
    * D            dedup
    * X            encryption
    * E            blkptr_t contains embedded data (see below)
    * lvl          level of indirection
    * type         DMU object type
    * phys birth   txg when dva[0] was written; zero if same as logical birth txg
    *              note that typically all the dva's would be written in this
    *              txg, but they could be different if they were moved by
    *              device removal.
    * log. birth   transaction group in which the block was logically born
    * fill count   number of non-zero blocks under this bp
    * checksum[4]  256-bit checksum of the data this bp describes
    */
   
   /*
    * The blkptr_t's of encrypted blocks also need to store the encryption
    * parameters so that the block can be decrypted. This layout is as follows:
    *
    *      64      56      48      40      32      24      16      8       0
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 0    |               vdev1           | GRID  |         ASIZE         |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 1    |G|                      offset1                                |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 2    |               vdev2           | GRID  |         ASIZE         |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 3    |G|                      offset2                                |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 4    |                       salt                                    |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 5    |                       IV1                                     |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 6    |BDX|lvl| type  | cksum |E| comp|    PSIZE      |     LSIZE     |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 7    |                       padding                                 |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 8    |                       padding                                 |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 9    |                       physical birth txg                      |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * a    |                       logical birth txg                       |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * b    |               IV2             |           fill count          |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * c    |                       checksum[0]                             |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * d    |                       checksum[1]                             |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * e    |                       MAC[0]                                  |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * f    |                       MAC[1]                                  |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    *
    * Legend:
    *
    * salt         Salt for generating encryption keys
    * IV1          First 64 bits of encryption IV
    * X            Block requires encryption handling (set to 1)
    * E            blkptr_t contains embedded data (set to 0, see below)
    * fill count   number of non-zero blocks under this bp (truncated to 32 bits)
    * IV2          Last 32 bits of encryption IV
    * checksum[2]  128-bit checksum of the data this bp describes
    * MAC[2]       128-bit message authentication code for this data
    *
    * The X bit being set indicates that this block is one of 3 types. If this is
    * a level 0 block with an encrypted object type, the block is encrypted
    * (see BP_IS_ENCRYPTED()). If this is a level 0 block with an unencrypted
    * object type, this block is authenticated with an HMAC (see
    * BP_IS_AUTHENTICATED()). Otherwise (if level > 0), this bp will use the MAC
    * words to store a checksum-of-MACs from the level below (see
    * BP_HAS_INDIRECT_MAC_CKSUM()). For convenience in the code, BP_IS_PROTECTED()
    * refers to both encrypted and authenticated blocks and BP_USES_CRYPT()
    * refers to any of these 3 kinds of blocks.
    *
    * The additional encryption parameters are the salt, IV, and MAC which are
    * explained in greater detail in the block comment at the top of zio_crypt.c.
    * The MAC occupies half of the checksum space since it serves a very similar
    * purpose: to prevent data corruption on disk. The only functional difference
    * is that the checksum is used to detect on-disk corruption whether or not the
    * encryption key is loaded and the MAC provides additional protection against
    * malicious disk tampering. We use the 3rd DVA to store the salt and first
    * 64 bits of the IV. As a result encrypted blocks can only have 2 copies
    * maximum instead of the normal 3. The last 32 bits of the IV are stored in
    * the upper bits of what is usually the fill count. Note that only blocks at
    * level 0 or -2 are ever encrypted, which allows us to guarantee that these
    * 32 bits are not trampled over by other code (see zio_crypt.c for details).
    * The salt and IV are not used for authenticated bps or bps with an indirect
    * MAC checksum, so these blocks can utilize all 3 DVAs and the full 64 bits
    * for the fill count.
    */
   
   /*
    * "Embedded" blkptr_t's don't actually point to a block, instead they
    * have a data payload embedded in the blkptr_t itself.  See the comment
    * in blkptr.c for more details.
    *
    * The blkptr_t is laid out as follows:
    *
    *      64      56      48      40      32      24      16      8       0
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 0    |      payload                                                  |
    * 1    |      payload                                                  |
    * 2    |      payload                                                  |
    * 3    |      payload                                                  |
    * 4    |      payload                                                  |
    * 5    |      payload                                                  |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 6    |BDX|lvl| type  | etype |E| comp| PSIZE|              LSIZE     |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * 7    |      payload                                                  |
    * 8    |      payload                                                  |
    * 9    |      payload                                                  |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * a    |                       logical birth txg                       |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    * b    |      payload                                                  |
    * c    |      payload                                                  |
    * d    |      payload                                                  |
    * e    |      payload                                                  |
    * f    |      payload                                                  |
    *      +-------+-------+-------+-------+-------+-------+-------+-------+
    *
    * Legend:
    *
    * payload              contains the embedded data
    * B (byteorder)        byteorder (endianness)
    * D (dedup)            padding (set to zero)
    * X                    encryption (set to zero)
    * E (embedded)         set to one
    * lvl                  indirection level
    * type                 DMU object type
    * etype                how to interpret embedded data (BP_EMBEDDED_TYPE_*)
    * comp                 compression function of payload
    * PSIZE                size of payload after compression, in bytes
    * LSIZE                logical size of payload, in bytes
    *                      note that 25 bits is enough to store the largest
    *                      "normal" BP's LSIZE (2^16 * 2^9) in bytes
    * log. birth           transaction group in which the block was logically born
    *
    * Note that LSIZE and PSIZE are stored in bytes, whereas for non-embedded
    * bp's they are stored in units of SPA_MINBLOCKSHIFT.
    * Generally, the generic BP_GET_*() macros can be used on embedded BP's.
    * The B, D, X, lvl, type, and comp fields are stored the same as with normal
    * BP's so the BP_SET_* macros can be used with them.  etype, PSIZE, LSIZE must
    * be set with the BPE_SET_* macros.  BP_SET_EMBEDDED() should be called before
    * other macros, as they assert that they are only used on BP's of the correct
    * "embedded-ness". Encrypted blkptr_t's cannot be embedded because they use
    * the payload space for encryption parameters (see the comment above on
    * how encryption parameters are stored).
    */
   
   #define BPE_GET_ETYPE(bp)       \
           (ASSERT(BP_IS_EMBEDDED(bp)), \
           BF64_GET((bp)->blk_prop, 40, 8))
   #define BPE_SET_ETYPE(bp, t)    do { \
           ASSERT(BP_IS_EMBEDDED(bp)); \
           BF64_SET((bp)->blk_prop, 40, 8, t); \
   } while (0)
   
   #define BPE_GET_LSIZE(bp)       \
           (ASSERT(BP_IS_EMBEDDED(bp)), \
           BF64_GET_SB((bp)->blk_prop, 0, 25, 0, 1))
   #define BPE_SET_LSIZE(bp, x)    do { \
           ASSERT(BP_IS_EMBEDDED(bp)); \
           BF64_SET_SB((bp)->blk_prop, 0, 25, 0, 1, x); \
   } while (0)
   
   #define BPE_GET_PSIZE(bp)       \
           (ASSERT(BP_IS_EMBEDDED(bp)), \
           BF64_GET_SB((bp)->blk_prop, 25, 7, 0, 1))
   #define BPE_SET_PSIZE(bp, x)    do { \
           ASSERT(BP_IS_EMBEDDED(bp)); \
           BF64_SET_SB((bp)->blk_prop, 25, 7, 0, 1, x); \
   } while (0)
   
   typedef enum bp_embedded_type {
           BP_EMBEDDED_TYPE_DATA,
           BP_EMBEDDED_TYPE_RESERVED, /* Reserved for Delphix byteswap feature. */
           BP_EMBEDDED_TYPE_REDACTED,
           NUM_BP_EMBEDDED_TYPES
   } bp_embedded_type_t;
   
   #define BPE_NUM_WORDS 14
   #define BPE_PAYLOAD_SIZE (BPE_NUM_WORDS * sizeof (uint64_t))
   #define BPE_IS_PAYLOADWORD(bp, wp) \
           ((wp) != &(bp)->blk_prop && (wp) != &(bp)->blk_birth)
   
   #define SPA_BLKPTRSHIFT 7               /* blkptr_t is 128 bytes        */
   #define SPA_DVAS_PER_BP 3               /* Number of DVAs in a bp       */
   #define SPA_SYNC_MIN_VDEVS 3            /* min vdevs to update during sync */
   
   /*
    * A block is a hole when it has either 1) never been written to, or
    * 2) is zero-filled. In both cases, ZFS can return all zeroes for all reads
    * without physically allocating disk space. Holes are represented in the
    * blkptr_t structure by zeroed blk_dva. Correct checking for holes is
    * done through the BP_IS_HOLE macro. For holes, the logical size, level,
    * DMU object type, and birth times are all also stored for holes that
    * were written to at some point (i.e. were punched after having been filled).
    */
   typedef struct blkptr {
           dva_t           blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
           uint64_t        blk_prop;       /* size, compression, type, etc     */
           uint64_t        blk_pad[2];     /* Extra space for the future       */
           uint64_t        blk_phys_birth; /* txg when block was allocated     */
           uint64_t        blk_birth;      /* transaction group at birth       */
           uint64_t        blk_fill;       /* fill count                       */
           zio_cksum_t     blk_cksum;      /* 256-bit checksum                 */
   } blkptr_t;
   
   /*
    * Macros to get and set fields in a bp or DVA.
    */
   
   /*
    * Note, for gang blocks, DVA_GET_ASIZE() is the total space allocated for
    * this gang DVA including its children BP's.  The space allocated at this
    * DVA's vdev/offset is vdev_gang_header_asize(vdev).
    */
   #define DVA_GET_ASIZE(dva)      \
           BF64_GET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, SPA_MINBLOCKSHIFT, 0)
   #define DVA_SET_ASIZE(dva, x)   \
           BF64_SET_SB((dva)->dva_word[0], 0, SPA_ASIZEBITS, \
           SPA_MINBLOCKSHIFT, 0, x)
   
   #define DVA_GET_GRID(dva)       BF64_GET((dva)->dva_word[0], 24, 8)
   #define DVA_SET_GRID(dva, x)    BF64_SET((dva)->dva_word[0], 24, 8, x)
   
   #define DVA_GET_VDEV(dva)       BF64_GET((dva)->dva_word[0], 32, SPA_VDEVBITS)
   #define DVA_SET_VDEV(dva, x)    \
           BF64_SET((dva)->dva_word[0], 32, SPA_VDEVBITS, x)
   
   #define DVA_GET_OFFSET(dva)     \
           BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
   #define DVA_SET_OFFSET(dva, x)  \
           BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)
   
   #define DVA_GET_GANG(dva)       BF64_GET((dva)->dva_word[1], 63, 1)
   #define DVA_SET_GANG(dva, x)    BF64_SET((dva)->dva_word[1], 63, 1, x)
   
   #define BP_GET_LSIZE(bp)        \
           (BP_IS_EMBEDDED(bp) ?   \
           (BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_DATA ? BPE_GET_LSIZE(bp) : 0): \
           BF64_GET_SB((bp)->blk_prop, 0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1))
   #define BP_SET_LSIZE(bp, x)     do { \
           ASSERT(!BP_IS_EMBEDDED(bp)); \
           BF64_SET_SB((bp)->blk_prop, \
               0, SPA_LSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
   } while (0)
   
   #define BP_GET_PSIZE(bp)        \
           (BP_IS_EMBEDDED(bp) ? 0 : \
           BF64_GET_SB((bp)->blk_prop, 16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1))
   #define BP_SET_PSIZE(bp, x)     do { \
           ASSERT(!BP_IS_EMBEDDED(bp)); \
           BF64_SET_SB((bp)->blk_prop, \
               16, SPA_PSIZEBITS, SPA_MINBLOCKSHIFT, 1, x); \
   } while (0)
   
   #define BP_GET_COMPRESS(bp)             \
           BF64_GET((bp)->blk_prop, 32, SPA_COMPRESSBITS)
   #define BP_SET_COMPRESS(bp, x)          \
           BF64_SET((bp)->blk_prop, 32, SPA_COMPRESSBITS, x)
   
   #define BP_IS_EMBEDDED(bp)              BF64_GET((bp)->blk_prop, 39, 1)
   #define BP_SET_EMBEDDED(bp, x)          BF64_SET((bp)->blk_prop, 39, 1, x)
   
   #define BP_GET_CHECKSUM(bp)             \
           (BP_IS_EMBEDDED(bp) ? ZIO_CHECKSUM_OFF : \
           BF64_GET((bp)->blk_prop, 40, 8))
   #define BP_SET_CHECKSUM(bp, x)          do { \
           ASSERT(!BP_IS_EMBEDDED(bp)); \
           BF64_SET((bp)->blk_prop, 40, 8, x); \
   } while (0)
   
   #define BP_GET_TYPE(bp)                 BF64_GET((bp)->blk_prop, 48, 8)
   #define BP_SET_TYPE(bp, x)              BF64_SET((bp)->blk_prop, 48, 8, x)
   
   #define BP_GET_LEVEL(bp)                BF64_GET((bp)->blk_prop, 56, 5)
   #define BP_SET_LEVEL(bp, x)             BF64_SET((bp)->blk_prop, 56, 5, x)
   
   /* encrypted, authenticated, and MAC cksum bps use the same bit */
   #define BP_USES_CRYPT(bp)               BF64_GET((bp)->blk_prop, 61, 1)
   #define BP_SET_CRYPT(bp, x)             BF64_SET((bp)->blk_prop, 61, 1, x)
   
   #define BP_IS_ENCRYPTED(bp)                     \
           (BP_USES_CRYPT(bp) &&                   \
           BP_GET_LEVEL(bp) <= 0 &&                \
           DMU_OT_IS_ENCRYPTED(BP_GET_TYPE(bp)))
   
   #define BP_IS_AUTHENTICATED(bp)                 \
           (BP_USES_CRYPT(bp) &&                   \
           BP_GET_LEVEL(bp) <= 0 &&                \
           !DMU_OT_IS_ENCRYPTED(BP_GET_TYPE(bp)))
   
   #define BP_HAS_INDIRECT_MAC_CKSUM(bp)           \
           (BP_USES_CRYPT(bp) && BP_GET_LEVEL(bp) > 0)
   
   #define BP_IS_PROTECTED(bp)                     \
           (BP_IS_ENCRYPTED(bp) || BP_IS_AUTHENTICATED(bp))
   
   #define BP_GET_DEDUP(bp)                BF64_GET((bp)->blk_prop, 62, 1)
   #define BP_SET_DEDUP(bp, x)             BF64_SET((bp)->blk_prop, 62, 1, x)
   
   #define BP_GET_BYTEORDER(bp)            BF64_GET((bp)->blk_prop, 63, 1)
   #define BP_SET_BYTEORDER(bp, x)         BF64_SET((bp)->blk_prop, 63, 1, x)
   
   #define BP_GET_FREE(bp)                 BF64_GET((bp)->blk_fill, 0, 1)
   #define BP_SET_FREE(bp, x)              BF64_SET((bp)->blk_fill, 0, 1, x)
   
   #define BP_PHYSICAL_BIRTH(bp)           \
           (BP_IS_EMBEDDED(bp) ? 0 : \
           (bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)
   
   #define BP_SET_BIRTH(bp, logical, physical)     \
   {                                               \
           ASSERT(!BP_IS_EMBEDDED(bp));            \
           (bp)->blk_birth = (logical);            \
           (bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \
   }
   
   #define BP_GET_FILL(bp)                         \
           ((BP_IS_ENCRYPTED(bp)) ? BF64_GET((bp)->blk_fill, 0, 32) : \
           ((BP_IS_EMBEDDED(bp)) ? 1 : (bp)->blk_fill))
   
   #define BP_SET_FILL(bp, fill)                   \
   {                                               \
           if (BP_IS_ENCRYPTED(bp))                        \
                   BF64_SET((bp)->blk_fill, 0, 32, fill); \
           else                                    \
                   (bp)->blk_fill = fill;          \
   }
   
   #define BP_GET_IV2(bp)                          \
           (ASSERT(BP_IS_ENCRYPTED(bp)),           \
           BF64_GET((bp)->blk_fill, 32, 32))
   #define BP_SET_IV2(bp, iv2)                     \
   {                                               \
           ASSERT(BP_IS_ENCRYPTED(bp));            \
           BF64_SET((bp)->blk_fill, 32, 32, iv2);  \
   }
   
   #define BP_IS_METADATA(bp)      \
           (BP_GET_LEVEL(bp) > 0 || DMU_OT_IS_METADATA(BP_GET_TYPE(bp)))
   
   #define BP_GET_ASIZE(bp)        \
           (BP_IS_EMBEDDED(bp) ? 0 : \
           DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
           DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
           (DVA_GET_ASIZE(&(bp)->blk_dva[2]) * !BP_IS_ENCRYPTED(bp)))
   
   #define BP_GET_UCSIZE(bp)       \
           (BP_IS_METADATA(bp) ? BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp))
   
   #define BP_GET_NDVAS(bp)        \
           (BP_IS_EMBEDDED(bp) ? 0 : \
           !!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
           !!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
           (!!DVA_GET_ASIZE(&(bp)->blk_dva[2]) * !BP_IS_ENCRYPTED(bp)))
   
   #define BP_COUNT_GANG(bp)       \
           (BP_IS_EMBEDDED(bp) ? 0 : \
           (DVA_GET_GANG(&(bp)->blk_dva[0]) + \
           DVA_GET_GANG(&(bp)->blk_dva[1]) + \
           (DVA_GET_GANG(&(bp)->blk_dva[2]) * !BP_IS_ENCRYPTED(bp))))
   
   #define DVA_EQUAL(dva1, dva2)   \
           ((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
           (dva1)->dva_word[0] == (dva2)->dva_word[0])
   
   #define BP_EQUAL(bp1, bp2)      \
           (BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) &&    \
           (bp1)->blk_birth == (bp2)->blk_birth &&                 \
           DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) &&    \
           DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) &&    \
           DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2]))
   
   
   #define DVA_IS_VALID(dva)       (DVA_GET_ASIZE(dva) != 0)
   
   #define BP_IDENTITY(bp)         (ASSERT(!BP_IS_EMBEDDED(bp)), &(bp)->blk_dva[0])
   #define BP_IS_GANG(bp)          \
           (BP_IS_EMBEDDED(bp) ? B_FALSE : DVA_GET_GANG(BP_IDENTITY(bp)))
   #define DVA_IS_EMPTY(dva)       ((dva)->dva_word[0] == 0ULL &&  \
                                   (dva)->dva_word[1] == 0ULL)
   #define BP_IS_HOLE(bp) \
           (!BP_IS_EMBEDDED(bp) && DVA_IS_EMPTY(BP_IDENTITY(bp)))
   
   #define BP_SET_REDACTED(bp) \
   {                                                       \
           BP_SET_EMBEDDED(bp, B_TRUE);                    \
           BPE_SET_ETYPE(bp, BP_EMBEDDED_TYPE_REDACTED);   \
   }
   #define BP_IS_REDACTED(bp) \
           (BP_IS_EMBEDDED(bp) && BPE_GET_ETYPE(bp) == BP_EMBEDDED_TYPE_REDACTED)
   
   /* BP_IS_RAIDZ(bp) assumes no block compression */
   #define BP_IS_RAIDZ(bp)         (DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \
                                   BP_GET_PSIZE(bp))
   
   #define BP_ZERO(bp)                             \
   {                                               \
           (bp)->blk_dva[0].dva_word[0] = 0;       \
           (bp)->blk_dva[0].dva_word[1] = 0;       \
           (bp)->blk_dva[1].dva_word[0] = 0;       \
           (bp)->blk_dva[1].dva_word[1] = 0;       \
           (bp)->blk_dva[2].dva_word[0] = 0;       \
           (bp)->blk_dva[2].dva_word[1] = 0;       \
           (bp)->blk_prop = 0;                     \
           (bp)->blk_pad[0] = 0;                   \
           (bp)->blk_pad[1] = 0;                   \
           (bp)->blk_phys_birth = 0;               \
           (bp)->blk_birth = 0;                    \
           (bp)->blk_fill = 0;                     \
           ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0); \
   }
   
   #ifdef _ZFS_BIG_ENDIAN
   #define ZFS_HOST_BYTEORDER      (0ULL)
   #else
   #define ZFS_HOST_BYTEORDER      (1ULL)
   #endif
   
   #define BP_SHOULD_BYTESWAP(bp)  (BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)
   
   #define BP_SPRINTF_LEN  400
   
   /*
    * This macro allows code sharing between zfs, libzpool, and mdb.
    * 'func' is either kmem_scnprintf() or mdb_snprintf().
    * 'ws' (whitespace) can be ' ' for single-line format, '\n' for multi-line.
    */
   
   #define SNPRINTF_BLKPTR(func, ws, buf, size, bp, type, checksum, compress) \
   {                                                                       \
           static const char *const copyname[] =                           \
               { "zero", "single", "double", "triple" };                   \
           int len = 0;                                                    \
           int copies = 0;                                                 \
           const char *crypt_type;                                         \
           if (bp != NULL) {                                               \
                   if (BP_IS_ENCRYPTED(bp)) {                              \
                           crypt_type = "encrypted";                       \
                           /* LINTED E_SUSPICIOUS_COMPARISON */            \
                   } else if (BP_IS_AUTHENTICATED(bp)) {                   \
                           crypt_type = "authenticated";                   \
                   } else if (BP_HAS_INDIRECT_MAC_CKSUM(bp)) {             \
                           crypt_type = "indirect-MAC";                    \
                   } else {                                                \
                           crypt_type = "unencrypted";                     \
                   }                                                       \
           }                                                               \
           if (bp == NULL) {                                               \
                   len += func(buf + len, size - len, "<NULL>");           \
           } else if (BP_IS_HOLE(bp)) {                                    \
                   len += func(buf + len, size - len,                      \
                       "HOLE [L%llu %s] "                                  \
                       "size=%llxL birth=%lluL",                           \
                       (u_longlong_t)BP_GET_LEVEL(bp),                     \
                       type,                                               \
                       (u_longlong_t)BP_GET_LSIZE(bp),                     \
                       (u_longlong_t)bp->blk_birth);                       \
           } else if (BP_IS_EMBEDDED(bp)) {                                \
                   len = func(buf + len, size - len,                       \
                       "EMBEDDED [L%llu %s] et=%u %s "                     \
                       "size=%llxL/%llxP birth=%lluL",                     \
                       (u_longlong_t)BP_GET_LEVEL(bp),                     \
                       type,                                               \
                       (int)BPE_GET_ETYPE(bp),                             \
                       compress,                                           \
                       (u_longlong_t)BPE_GET_LSIZE(bp),                    \
                       (u_longlong_t)BPE_GET_PSIZE(bp),                    \
                       (u_longlong_t)bp->blk_birth);                       \
           } else if (BP_IS_REDACTED(bp)) {                                \
                   len += func(buf + len, size - len,                      \
                       "REDACTED [L%llu %s] size=%llxL birth=%lluL",       \
                       (u_longlong_t)BP_GET_LEVEL(bp),                     \
                       type,                                               \
                       (u_longlong_t)BP_GET_LSIZE(bp),                     \
                       (u_longlong_t)bp->blk_birth);                       \
           } else {                                                        \
                   for (int d = 0; d < BP_GET_NDVAS(bp); d++) {            \
                           const dva_t *dva = &bp->blk_dva[d];             \
                           if (DVA_IS_VALID(dva))                          \
                                   copies++;                               \
                           len += func(buf + len, size - len,              \
                               "DVA[%d]=<%llu:%llx:%llx>%c", d,            \
                               (u_longlong_t)DVA_GET_VDEV(dva),            \
                               (u_longlong_t)DVA_GET_OFFSET(dva),          \
                               (u_longlong_t)DVA_GET_ASIZE(dva),           \
                               ws);                                        \
                   }                                                       \
                   if (BP_IS_ENCRYPTED(bp)) {                              \
                           len += func(buf + len, size - len,              \
                               "salt=%llx iv=%llx:%llx%c",                 \
                               (u_longlong_t)bp->blk_dva[2].dva_word[0],   \
                               (u_longlong_t)bp->blk_dva[2].dva_word[1],   \
                               (u_longlong_t)BP_GET_IV2(bp),               \
                               ws);                                        \
                   }                                                       \
                   if (BP_IS_GANG(bp) &&                                   \
                       DVA_GET_ASIZE(&bp->blk_dva[2]) <=                   \
                       DVA_GET_ASIZE(&bp->blk_dva[1]) / 2)                 \
                           copies--;                                       \
                   len += func(buf + len, size - len,                      \
                       "[L%llu %s] %s %s %s %s %s %s %s%c"                 \
                       "size=%llxL/%llxP birth=%lluL/%lluP fill=%llu%c"    \
                       "cksum=%llx:%llx:%llx:%llx",                        \
                       (u_longlong_t)BP_GET_LEVEL(bp),                     \
                       type,                                               \
                       checksum,                                           \
                       compress,                                           \
                       crypt_type,                                         \
                       BP_GET_BYTEORDER(bp) == 0 ? "BE" : "LE",            \
                       BP_IS_GANG(bp) ? "gang" : "contiguous",             \
                       BP_GET_DEDUP(bp) ? "dedup" : "unique",              \
                       copyname[copies],                                   \
                       ws,                                                 \
                       (u_longlong_t)BP_GET_LSIZE(bp),                     \
                       (u_longlong_t)BP_GET_PSIZE(bp),                     \
                       (u_longlong_t)bp->blk_birth,                        \
                       (u_longlong_t)BP_PHYSICAL_BIRTH(bp),                \
                       (u_longlong_t)BP_GET_FILL(bp),                      \
                       ws,                                                 \
                       (u_longlong_t)bp->blk_cksum.zc_word[0],             \
                       (u_longlong_t)bp->blk_cksum.zc_word[1],             \
                       (u_longlong_t)bp->blk_cksum.zc_word[2],             \
                       (u_longlong_t)bp->blk_cksum.zc_word[3]);            \
           }                                                               \
           ASSERT(len < size);                                             \
   }
   
   #define BP_GET_BUFC_TYPE(bp)                                            \
           (BP_IS_METADATA(bp) ? ARC_BUFC_METADATA : ARC_BUFC_DATA)
   
   typedef enum spa_import_type {
           SPA_IMPORT_EXISTING,
           SPA_IMPORT_ASSEMBLE
   } spa_import_type_t;
   
   typedef enum spa_mode {
           SPA_MODE_UNINIT = 0,
           SPA_MODE_READ = 1,
           SPA_MODE_WRITE = 2,
   } spa_mode_t;
   
   /*
    * Send TRIM commands in-line during normal pool operation while deleting.
    *      OFF: no
    *      ON: yes
    * NB: IN_FREEBSD_BASE is defined within the FreeBSD sources.
    */
   typedef enum {
           SPA_AUTOTRIM_OFF = 0,   /* default */
           SPA_AUTOTRIM_ON,
   #ifdef IN_FREEBSD_BASE
           SPA_AUTOTRIM_DEFAULT = SPA_AUTOTRIM_ON,
   #else
           SPA_AUTOTRIM_DEFAULT = SPA_AUTOTRIM_OFF,
   #endif
   } spa_autotrim_t;
   
   /*
    * Reason TRIM command was issued, used internally for accounting purposes.
    */
   typedef enum trim_type {
           TRIM_TYPE_MANUAL = 0,
           TRIM_TYPE_AUTO = 1,
           TRIM_TYPE_SIMPLE = 2
   } trim_type_t;
   
   /* state manipulation functions */
   extern int spa_open(const char *pool, spa_t **, const void *tag);
   extern int spa_open_rewind(const char *pool, spa_t **, const void *tag,
       nvlist_t *policy, nvlist_t **config);
   extern int spa_get_stats(const char *pool, nvlist_t **config, char *altroot,
       size_t buflen);
   extern int spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props,
       nvlist_t *zplprops, struct dsl_crypto_params *dcp);
   extern int spa_import(char *pool, nvlist_t *config, nvlist_t *props,
       uint64_t flags);
   extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
   extern int spa_destroy(const char *pool);
   extern int spa_checkpoint(const char *pool);
   extern int spa_checkpoint_discard(const char *pool);
   extern int spa_export(const char *pool, nvlist_t **oldconfig, boolean_t force,
       boolean_t hardforce);
   extern int spa_reset(const char *pool);
   extern void spa_async_request(spa_t *spa, int flag);
   extern void spa_async_unrequest(spa_t *spa, int flag);
   extern void spa_async_suspend(spa_t *spa);
   extern void spa_async_resume(spa_t *spa);
   extern int spa_async_tasks(spa_t *spa);
   extern spa_t *spa_inject_addref(char *pool);
   extern void spa_inject_delref(spa_t *spa);
   extern void spa_scan_stat_init(spa_t *spa);
   extern int spa_scan_get_stats(spa_t *spa, pool_scan_stat_t *ps);
   extern int bpobj_enqueue_alloc_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx);
   extern int bpobj_enqueue_free_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx);
   
   #define SPA_ASYNC_CONFIG_UPDATE                 0x01
   #define SPA_ASYNC_REMOVE                        0x02
   #define SPA_ASYNC_PROBE                         0x04
   #define SPA_ASYNC_RESILVER_DONE                 0x08
   #define SPA_ASYNC_RESILVER                      0x10
   #define SPA_ASYNC_AUTOEXPAND                    0x20
   #define SPA_ASYNC_REMOVE_DONE                   0x40
   #define SPA_ASYNC_REMOVE_STOP                   0x80
   #define SPA_ASYNC_INITIALIZE_RESTART            0x100
   #define SPA_ASYNC_TRIM_RESTART                  0x200
   #define SPA_ASYNC_AUTOTRIM_RESTART              0x400
   #define SPA_ASYNC_L2CACHE_REBUILD               0x800
   #define SPA_ASYNC_L2CACHE_TRIM                  0x1000
   #define SPA_ASYNC_REBUILD_DONE                  0x2000
   
   /* device manipulation */
   extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot);
   extern int spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot,
       int replacing, int rebuild);
   extern int spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid,
       int replace_done);
   extern int spa_vdev_alloc(spa_t *spa, uint64_t guid);
   extern int spa_vdev_noalloc(spa_t *spa, uint64_t guid);
   extern boolean_t spa_vdev_remove_active(spa_t *spa);
   extern int spa_vdev_initialize(spa_t *spa, nvlist_t *nv, uint64_t cmd_type,
       nvlist_t *vdev_errlist);
   extern int spa_vdev_trim(spa_t *spa, nvlist_t *nv, uint64_t cmd_type,
       uint64_t rate, boolean_t partial, boolean_t secure, nvlist_t *vdev_errlist);
   extern int spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath);
   extern int spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru);
   extern int spa_vdev_split_mirror(spa_t *spa, const char *newname,
       nvlist_t *config, nvlist_t *props, boolean_t exp);
   
   /* spare state (which is global across all pools) */
   extern void spa_spare_add(vdev_t *vd);
   extern void spa_spare_remove(vdev_t *vd);
   extern boolean_t spa_spare_exists(uint64_t guid, uint64_t *pool, int *refcnt);
   extern void spa_spare_activate(vdev_t *vd);
   
   /* L2ARC state (which is global across all pools) */
   extern void spa_l2cache_add(vdev_t *vd);
   extern void spa_l2cache_remove(vdev_t *vd);
   extern boolean_t spa_l2cache_exists(uint64_t guid, uint64_t *pool);
   extern void spa_l2cache_activate(vdev_t *vd);
   extern void spa_l2cache_drop(spa_t *spa);
   
   /* scanning */
   extern int spa_scan(spa_t *spa, pool_scan_func_t func);
   extern int spa_scan_stop(spa_t *spa);
   extern int spa_scrub_pause_resume(spa_t *spa, pool_scrub_cmd_t flag);
   
   /* spa syncing */
   extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
   extern void spa_sync_allpools(void);
   
   extern uint_t zfs_sync_pass_deferred_free;
   
   /* spa namespace global mutex */
   extern kmutex_t spa_namespace_lock;
   
   /*
    * SPA configuration functions in spa_config.c
    */
   
   #define SPA_CONFIG_UPDATE_POOL  0
   #define SPA_CONFIG_UPDATE_VDEVS 1
   
   extern void spa_write_cachefile(spa_t *, boolean_t, boolean_t, boolean_t);
   extern void spa_config_load(void);
   extern nvlist_t *spa_all_configs(uint64_t *);
   extern void spa_config_set(spa_t *spa, nvlist_t *config);
   extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
       int getstats);
   extern void spa_config_update(spa_t *spa, int what);
   extern int spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv,
       vdev_t *parent, uint_t id, int atype);
   
   
   /*
    * Miscellaneous SPA routines in spa_misc.c
    */
   
   /* Namespace manipulation */
   extern spa_t *spa_lookup(const char *name);
   extern spa_t *spa_add(const char *name, nvlist_t *config, const char *altroot);
   extern void spa_remove(spa_t *spa);
   extern spa_t *spa_next(spa_t *prev);
   
   /* Refcount functions */
   extern void spa_open_ref(spa_t *spa, const void *tag);
   extern void spa_close(spa_t *spa, const void *tag);
   extern void spa_async_close(spa_t *spa, const void *tag);
   extern boolean_t spa_refcount_zero(spa_t *spa);
   
   #define SCL_NONE        0x00
   #define SCL_CONFIG      0x01
   #define SCL_STATE       0x02
   #define SCL_L2ARC       0x04            /* hack until L2ARC 2.0 */
   #define SCL_ALLOC       0x08
   #define SCL_ZIO         0x10
   #define SCL_FREE        0x20
   #define SCL_VDEV        0x40
   #define SCL_LOCKS       7
   #define SCL_ALL         ((1 << SCL_LOCKS) - 1)
   #define SCL_STATE_ALL   (SCL_STATE | SCL_L2ARC | SCL_ZIO)
   
   /* Historical pool statistics */
   typedef struct spa_history_kstat {
           kmutex_t                lock;
           uint64_t                count;
           uint64_t                size;
           kstat_t                 *kstat;
           void                    *priv;
           list_t                  list;
   } spa_history_kstat_t;
   
   typedef struct spa_history_list {
           uint64_t                size;
           procfs_list_t           procfs_list;
   } spa_history_list_t;
   
   typedef struct spa_stats {
           spa_history_list_t      read_history;
           spa_history_list_t      txg_history;
           spa_history_kstat_t     tx_assign_histogram;
           spa_history_list_t      mmp_history;
           spa_history_kstat_t     state;          /* pool state */
           spa_history_kstat_t     guid;           /* pool guid */
           spa_history_kstat_t     iostats;
   } spa_stats_t;
   
   typedef enum txg_state {
           TXG_STATE_BIRTH         = 0,
           TXG_STATE_OPEN          = 1,
           TXG_STATE_QUIESCED      = 2,
           TXG_STATE_WAIT_FOR_SYNC = 3,
           TXG_STATE_SYNCED        = 4,
           TXG_STATE_COMMITTED     = 5,
   } txg_state_t;
   
   typedef struct txg_stat {
           vdev_stat_t             vs1;
           vdev_stat_t             vs2;
           uint64_t                txg;
           uint64_t                ndirty;
   } txg_stat_t;
   
   /* Assorted pool IO kstats */
   typedef struct spa_iostats {
           kstat_named_t   trim_extents_written;
           kstat_named_t   trim_bytes_written;
           kstat_named_t   trim_extents_skipped;
           kstat_named_t   trim_bytes_skipped;
           kstat_named_t   trim_extents_failed;
           kstat_named_t   trim_bytes_failed;
           kstat_named_t   autotrim_extents_written;
           kstat_named_t   autotrim_bytes_written;
           kstat_named_t   autotrim_extents_skipped;
           kstat_named_t   autotrim_bytes_skipped;
           kstat_named_t   autotrim_extents_failed;
           kstat_named_t   autotrim_bytes_failed;
           kstat_named_t   simple_trim_extents_written;
           kstat_named_t   simple_trim_bytes_written;
           kstat_named_t   simple_trim_extents_skipped;
           kstat_named_t   simple_trim_bytes_skipped;
           kstat_named_t   simple_trim_extents_failed;
           kstat_named_t   simple_trim_bytes_failed;
   } spa_iostats_t;
   
   extern void spa_stats_init(spa_t *spa);
   extern void spa_stats_destroy(spa_t *spa);
   extern void spa_read_history_add(spa_t *spa, const zbookmark_phys_t *zb,
       uint32_t aflags);
   extern void spa_txg_history_add(spa_t *spa, uint64_t txg, hrtime_t birth_time);
   extern int spa_txg_history_set(spa_t *spa,  uint64_t txg,
       txg_state_t completed_state, hrtime_t completed_time);
   extern txg_stat_t *spa_txg_history_init_io(spa_t *, uint64_t,
       struct dsl_pool *);
   extern void spa_txg_history_fini_io(spa_t *, txg_stat_t *);
   extern void spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs);
   extern int spa_mmp_history_set_skip(spa_t *spa, uint64_t mmp_kstat_id);
   extern int spa_mmp_history_set(spa_t *spa, uint64_t mmp_kstat_id, int io_error,
       hrtime_t duration);
   extern void spa_mmp_history_add(spa_t *spa, uint64_t txg, uint64_t timestamp,
       uint64_t mmp_delay, vdev_t *vd, int label, uint64_t mmp_kstat_id,
       int error);
   extern void spa_iostats_trim_add(spa_t *spa, trim_type_t type,
       uint64_t extents_written, uint64_t bytes_written,
       uint64_t extents_skipped, uint64_t bytes_skipped,
       uint64_t extents_failed, uint64_t bytes_failed);
   extern void spa_import_progress_add(spa_t *spa);
   extern void spa_import_progress_remove(uint64_t spa_guid);
   extern int spa_import_progress_set_mmp_check(uint64_t pool_guid,
       uint64_t mmp_sec_remaining);
   extern int spa_import_progress_set_max_txg(uint64_t pool_guid,
       uint64_t max_txg);
   extern int spa_import_progress_set_state(uint64_t pool_guid,
       spa_load_state_t spa_load_state);
   
   /* Pool configuration locks */
   extern int spa_config_tryenter(spa_t *spa, int locks, const void *tag,
       krw_t rw);
   extern void spa_config_enter(spa_t *spa, int locks, const void *tag, krw_t rw);
   extern void spa_config_exit(spa_t *spa, int locks, const void *tag);
   extern int spa_config_held(spa_t *spa, int locks, krw_t rw);
   
   /* Pool vdev add/remove lock */
   extern uint64_t spa_vdev_enter(spa_t *spa);
   extern uint64_t spa_vdev_detach_enter(spa_t *spa, uint64_t guid);
   extern uint64_t spa_vdev_config_enter(spa_t *spa);
   extern void spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg,
       int error, const char *tag);
   extern int spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error);
   
   /* Pool vdev state change lock */
   extern void spa_vdev_state_enter(spa_t *spa, int oplock);
   extern int spa_vdev_state_exit(spa_t *spa, vdev_t *vd, int error);
   
   /* Log state */
   typedef enum spa_log_state {
           SPA_LOG_UNKNOWN = 0,    /* unknown log state */
           SPA_LOG_MISSING,        /* missing log(s) */
           SPA_LOG_CLEAR,          /* clear the log(s) */
           SPA_LOG_GOOD,           /* log(s) are good */
   } spa_log_state_t;
   
  extern spa_log_state_t spa_get_log_state(spa_t *spa);
  extern void spa_set_log_state(spa_t *spa, spa_log_state_t state);
  extern int spa_reset_logs(spa_t *spa);
  
  /* Log claim callback */
  extern void spa_claim_notify(zio_t *zio);
  extern void spa_deadman(void *);
  
  /* Accessor functions */
  extern boolean_t spa_shutting_down(spa_t *spa);
  extern struct dsl_pool *spa_get_dsl(spa_t *spa);
  extern boolean_t spa_is_initializing(spa_t *spa);
  extern boolean_t spa_indirect_vdevs_loaded(spa_t *spa);
  extern blkptr_t *spa_get_rootblkptr(spa_t *spa);
  extern void spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp);
  extern void spa_altroot(spa_t *, char *, size_t);
  extern uint32_t spa_sync_pass(spa_t *spa);
  extern char *spa_name(spa_t *spa);
  extern uint64_t spa_guid(spa_t *spa);
  extern uint64_t spa_load_guid(spa_t *spa);
  extern uint64_t spa_last_synced_txg(spa_t *spa);
  extern uint64_t spa_first_txg(spa_t *spa);
  extern uint64_t spa_syncing_txg(spa_t *spa);
  extern uint64_t spa_final_dirty_txg(spa_t *spa);
  extern uint64_t spa_version(spa_t *spa);
  extern pool_state_t spa_state(spa_t *spa);
  extern spa_load_state_t spa_load_state(spa_t *spa);
  extern uint64_t spa_freeze_txg(spa_t *spa);
  extern uint64_t spa_get_worst_case_asize(spa_t *spa, uint64_t lsize);
  extern uint64_t spa_get_dspace(spa_t *spa);
  extern uint64_t spa_get_checkpoint_space(spa_t *spa);
  extern uint64_t spa_get_slop_space(spa_t *spa);
  extern void spa_update_dspace(spa_t *spa);
  extern uint64_t spa_version(spa_t *spa);
  extern boolean_t spa_deflate(spa_t *spa);
  extern metaslab_class_t *spa_normal_class(spa_t *spa);
  extern metaslab_class_t *spa_log_class(spa_t *spa);
  extern metaslab_class_t *spa_embedded_log_class(spa_t *spa);
  extern metaslab_class_t *spa_special_class(spa_t *spa);
  extern metaslab_class_t *spa_dedup_class(spa_t *spa);
  extern metaslab_class_t *spa_preferred_class(spa_t *spa, uint64_t size,
      dmu_object_type_t objtype, uint_t level, uint_t special_smallblk);
  
  extern void spa_evicting_os_register(spa_t *, objset_t *os);
  extern void spa_evicting_os_deregister(spa_t *, objset_t *os);
  extern void spa_evicting_os_wait(spa_t *spa);
  extern int spa_max_replication(spa_t *spa);
  extern int spa_prev_software_version(spa_t *spa);
  extern uint64_t spa_get_failmode(spa_t *spa);
  extern uint64_t spa_get_deadman_failmode(spa_t *spa);
  extern void spa_set_deadman_failmode(spa_t *spa, const char *failmode);
  extern boolean_t spa_suspended(spa_t *spa);
  extern uint64_t spa_bootfs(spa_t *spa);
  extern uint64_t spa_delegation(spa_t *spa);
  extern objset_t *spa_meta_objset(spa_t *spa);
  extern space_map_t *spa_syncing_log_sm(spa_t *spa);
  extern uint64_t spa_deadman_synctime(spa_t *spa);
  extern uint64_t spa_deadman_ziotime(spa_t *spa);
  extern uint64_t spa_dirty_data(spa_t *spa);
  extern spa_autotrim_t spa_get_autotrim(spa_t *spa);
  
  /* Miscellaneous support routines */
  extern void spa_load_failed(spa_t *spa, const char *fmt, ...)
      __attribute__((format(printf, 2, 3)));
  extern void spa_load_note(spa_t *spa, const char *fmt, ...)
      __attribute__((format(printf, 2, 3)));
  extern void spa_activate_mos_feature(spa_t *spa, const char *feature,
      dmu_tx_t *tx);
  extern void spa_deactivate_mos_feature(spa_t *spa, const char *feature);
  extern spa_t *spa_by_guid(uint64_t pool_guid, uint64_t device_guid);
  extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
  extern char *spa_strdup(const char *);
  extern void spa_strfree(char *);
  extern uint64_t spa_generate_guid(spa_t *spa);
  extern void snprintf_blkptr(char *buf, size_t buflen, const blkptr_t *bp);
  extern void spa_freeze(spa_t *spa);
  extern int spa_change_guid(spa_t *spa);
  extern void spa_upgrade(spa_t *spa, uint64_t version);
  extern void spa_evict_all(void);
  extern vdev_t *spa_lookup_by_guid(spa_t *spa, uint64_t guid,
      boolean_t l2cache);
  extern boolean_t spa_has_l2cache(spa_t *, uint64_t guid);
  extern boolean_t spa_has_spare(spa_t *, uint64_t guid);
  extern uint64_t dva_get_dsize_sync(spa_t *spa, const dva_t *dva);
  extern uint64_t bp_get_dsize_sync(spa_t *spa, const blkptr_t *bp);
  extern uint64_t bp_get_dsize(spa_t *spa, const blkptr_t *bp);
  extern boolean_t spa_has_slogs(spa_t *spa);
  extern boolean_t spa_is_root(spa_t *spa);
  extern boolean_t spa_writeable(spa_t *spa);
  extern boolean_t spa_has_pending_synctask(spa_t *spa);
  extern int spa_maxblocksize(spa_t *spa);
  extern int spa_maxdnodesize(spa_t *spa);
  extern boolean_t spa_has_checkpoint(spa_t *spa);
  extern boolean_t spa_importing_readonly_checkpoint(spa_t *spa);
  extern boolean_t spa_suspend_async_destroy(spa_t *spa);
  extern uint64_t spa_min_claim_txg(spa_t *spa);
  extern boolean_t zfs_dva_valid(spa_t *spa, const dva_t *dva,
      const blkptr_t *bp);
  typedef void (*spa_remap_cb_t)(uint64_t vdev, uint64_t offset, uint64_t size,
      void *arg);
  extern boolean_t spa_remap_blkptr(spa_t *spa, blkptr_t *bp,
      spa_remap_cb_t callback, void *arg);
  extern uint64_t spa_get_last_removal_txg(spa_t *spa);
  extern boolean_t spa_trust_config(spa_t *spa);
  extern uint64_t spa_missing_tvds_allowed(spa_t *spa);
  extern void spa_set_missing_tvds(spa_t *spa, uint64_t missing);
  extern boolean_t spa_top_vdevs_spacemap_addressable(spa_t *spa);
  extern uint64_t spa_total_metaslabs(spa_t *spa);
  extern boolean_t spa_multihost(spa_t *spa);
  extern uint32_t spa_get_hostid(spa_t *spa);
  extern void spa_activate_allocation_classes(spa_t *, dmu_tx_t *);
  extern boolean_t spa_livelist_delete_check(spa_t *spa);
  
  extern spa_mode_t spa_mode(spa_t *spa);
  extern uint64_t zfs_strtonum(const char *str, char **nptr);
  
  extern char *spa_his_ievent_table[];
  
  extern void spa_history_create_obj(spa_t *spa, dmu_tx_t *tx);
  extern int spa_history_get(spa_t *spa, uint64_t *offset, uint64_t *len_read,
      char *his_buf);
  extern int spa_history_log(spa_t *spa, const char *his_buf);
  extern int spa_history_log_nvl(spa_t *spa, nvlist_t *nvl);
  extern void spa_history_log_version(spa_t *spa, const char *operation,
      dmu_tx_t *tx);
  extern void spa_history_log_internal(spa_t *spa, const char *operation,
      dmu_tx_t *tx, const char *fmt, ...) __printflike(4, 5);
  extern void spa_history_log_internal_ds(struct dsl_dataset *ds, const char *op,
      dmu_tx_t *tx, const char *fmt, ...)  __printflike(4, 5);
  extern void spa_history_log_internal_dd(dsl_dir_t *dd, const char *operation,
      dmu_tx_t *tx, const char *fmt, ...) __printflike(4, 5);
  
  extern const char *spa_state_to_name(spa_t *spa);
  
  /* error handling */
  struct zbookmark_phys;
  extern void spa_log_error(spa_t *spa, const zbookmark_phys_t *zb);
  extern void spa_remove_error(spa_t *spa, zbookmark_phys_t *zb);
  extern int zfs_ereport_post(const char *clazz, spa_t *spa, vdev_t *vd,
      const zbookmark_phys_t *zb, zio_t *zio, uint64_t state);
  extern boolean_t zfs_ereport_is_valid(const char *clazz, spa_t *spa, vdev_t *vd,
      zio_t *zio);
  extern void zfs_ereport_taskq_fini(void);
  extern void zfs_ereport_clear(spa_t *spa, vdev_t *vd);
  extern nvlist_t *zfs_event_create(spa_t *spa, vdev_t *vd, const char *type,
      const char *name, nvlist_t *aux);
  extern void zfs_post_remove(spa_t *spa, vdev_t *vd);
  extern void zfs_post_state_change(spa_t *spa, vdev_t *vd, uint64_t laststate);
  extern void zfs_post_autoreplace(spa_t *spa, vdev_t *vd);
  extern uint64_t spa_approx_errlog_size(spa_t *spa);
  extern int spa_get_errlog(spa_t *spa, void *uaddr, uint64_t *count);
  extern void spa_errlog_rotate(spa_t *spa);
  extern void spa_errlog_drain(spa_t *spa);
  extern void spa_errlog_sync(spa_t *spa, uint64_t txg);
  extern void spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub);
  extern void spa_delete_dataset_errlog(spa_t *spa, uint64_t ds, dmu_tx_t *tx);
  extern void spa_swap_errlog(spa_t *spa, uint64_t new_head_ds,
      uint64_t old_head_ds, dmu_tx_t *tx);
  extern void sync_error_list(spa_t *spa, avl_tree_t *t, uint64_t *obj,
      dmu_tx_t *tx);
  extern void spa_upgrade_errlog(spa_t *spa, dmu_tx_t *tx);
  
  /* vdev cache */
  extern void vdev_cache_stat_init(void);
  extern void vdev_cache_stat_fini(void);
  
  /* vdev mirror */
  extern void vdev_mirror_stat_init(void);
  extern void vdev_mirror_stat_fini(void);
  
  /* Initialization and termination */
  extern void spa_init(spa_mode_t mode);
  extern void spa_fini(void);
  extern void spa_boot_init(void);
  
  /* properties */
  extern int spa_prop_set(spa_t *spa, nvlist_t *nvp);
  extern int spa_prop_get(spa_t *spa, nvlist_t **nvp);
  extern void spa_prop_clear_bootfs(spa_t *spa, uint64_t obj, dmu_tx_t *tx);
  extern void spa_configfile_set(spa_t *, nvlist_t *, boolean_t);
  
  /* asynchronous event notification */
  extern void spa_event_notify(spa_t *spa, vdev_t *vdev, nvlist_t *hist_nvl,
      const char *name);
  extern void zfs_ereport_zvol_post(const char *subclass, const char *name,
      const char *device_name, const char *raw_name);
  
  /* waiting for pool activities to complete */
  extern int spa_wait(const char *pool, zpool_wait_activity_t activity,
      boolean_t *waited);
  extern int spa_wait_tag(const char *name, zpool_wait_activity_t activity,
      uint64_t tag, boolean_t *waited);
  extern void spa_notify_waiters(spa_t *spa);
  extern void spa_wake_waiters(spa_t *spa);
  
  extern void spa_import_os(spa_t *spa);
  extern void spa_export_os(spa_t *spa);
  extern void spa_activate_os(spa_t *spa);
  extern void spa_deactivate_os(spa_t *spa);
  
  /* module param call functions */
  int param_set_deadman_ziotime(ZFS_MODULE_PARAM_ARGS);
  int param_set_deadman_synctime(ZFS_MODULE_PARAM_ARGS);
  int param_set_slop_shift(ZFS_MODULE_PARAM_ARGS);
  int param_set_deadman_failmode(ZFS_MODULE_PARAM_ARGS);
  
  #ifdef ZFS_DEBUG
  #define dprintf_bp(bp, fmt, ...) do {                           \
          if (zfs_flags & ZFS_DEBUG_DPRINTF) {                    \
          char *__blkbuf = kmem_alloc(BP_SPRINTF_LEN, KM_SLEEP);  \
          snprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp));        \
          dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf);            \
          kmem_free(__blkbuf, BP_SPRINTF_LEN);                    \
          } \
  } while (0)
  #else
  #define dprintf_bp(bp, fmt, ...)
  #endif
  
  extern spa_mode_t spa_mode_global;
  extern int zfs_deadman_enabled;
  extern uint64_t zfs_deadman_synctime_ms;
  extern uint64_t zfs_deadman_ziotime_ms;
  extern uint64_t zfs_deadman_checktime_ms;
  
  extern kmem_cache_t *zio_buf_cache[];
  extern kmem_cache_t *zio_data_buf_cache[];
  
  #ifdef  __cplusplus
  }
  #endif
  
  #endif  /* _SYS_SPA_H */

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