FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/zio.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 2011 Nexenta Systems, Inc. All rights reserved.
     * Copyright (c) 2012, 2020 by Delphix. All rights reserved.
     * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
     * Copyright (c) 2013, Joyent, Inc. All rights reserved.
     * Copyright 2016 Toomas Soome <tsoome@me.com>
     * Copyright (c) 2019, Allan Jude
     * Copyright (c) 2019, Klara Inc.
     * Copyright (c) 2019-2020, Michael Niewöhner
     */
    
    #ifndef _ZIO_H
    #define _ZIO_H
    
    #include <sys/zio_priority.h>
    #include <sys/zfs_context.h>
    #include <sys/spa.h>
    #include <sys/txg.h>
    #include <sys/avl.h>
    #include <sys/fs/zfs.h>
    #include <sys/zio_impl.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    /*
     * Embedded checksum
     */
    #define ZEC_MAGIC       0x210da7ab10c7a11ULL
    
    typedef struct zio_eck {
            uint64_t        zec_magic;      /* for validation, endianness   */
            zio_cksum_t     zec_cksum;      /* 256-bit checksum             */
    } zio_eck_t;
    
    /*
     * Gang block headers are self-checksumming and contain an array
     * of block pointers.
     */
    #define SPA_GANGBLOCKSIZE       SPA_MINBLOCKSIZE
    #define SPA_GBH_NBLKPTRS        ((SPA_GANGBLOCKSIZE - \
            sizeof (zio_eck_t)) / sizeof (blkptr_t))
    #define SPA_GBH_FILLER          ((SPA_GANGBLOCKSIZE - \
            sizeof (zio_eck_t) - \
            (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
            sizeof (uint64_t))
    
    typedef struct zio_gbh {
            blkptr_t                zg_blkptr[SPA_GBH_NBLKPTRS];
            uint64_t                zg_filler[SPA_GBH_FILLER];
            zio_eck_t               zg_tail;
    } zio_gbh_phys_t;
    
    enum zio_checksum {
            ZIO_CHECKSUM_INHERIT = 0,
            ZIO_CHECKSUM_ON,
            ZIO_CHECKSUM_OFF,
            ZIO_CHECKSUM_LABEL,
            ZIO_CHECKSUM_GANG_HEADER,
            ZIO_CHECKSUM_ZILOG,
            ZIO_CHECKSUM_FLETCHER_2,
            ZIO_CHECKSUM_FLETCHER_4,
            ZIO_CHECKSUM_SHA256,
            ZIO_CHECKSUM_ZILOG2,
            ZIO_CHECKSUM_NOPARITY,
            ZIO_CHECKSUM_SHA512,
            ZIO_CHECKSUM_SKEIN,
            ZIO_CHECKSUM_EDONR,
            ZIO_CHECKSUM_BLAKE3,
            ZIO_CHECKSUM_FUNCTIONS
    };
    
    /*
     * The number of "legacy" compression functions which can be set on individual
     * objects.
     */
   #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2
   
   #define ZIO_CHECKSUM_ON_VALUE   ZIO_CHECKSUM_FLETCHER_4
   #define ZIO_CHECKSUM_DEFAULT    ZIO_CHECKSUM_ON
   
   #define ZIO_CHECKSUM_MASK       0xffULL
   #define ZIO_CHECKSUM_VERIFY     (1U << 8)
   
   #define ZIO_DEDUPCHECKSUM       ZIO_CHECKSUM_SHA256
   
   /* macros defining encryption lengths */
   #define ZIO_OBJSET_MAC_LEN              32
   #define ZIO_DATA_IV_LEN                 12
   #define ZIO_DATA_SALT_LEN               8
   #define ZIO_DATA_MAC_LEN                16
   
   /*
    * The number of "legacy" compression functions which can be set on individual
    * objects.
    */
   #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
   
   /*
    * The meaning of "compress = on" selected by the compression features enabled
    * on a given pool.
    */
   #define ZIO_COMPRESS_LEGACY_ON_VALUE    ZIO_COMPRESS_LZJB
   #define ZIO_COMPRESS_LZ4_ON_VALUE       ZIO_COMPRESS_LZ4
   
   #define ZIO_COMPRESS_DEFAULT            ZIO_COMPRESS_ON
   
   #define BOOTFS_COMPRESS_VALID(compress)                 \
           ((compress) == ZIO_COMPRESS_LZJB ||             \
           (compress) == ZIO_COMPRESS_LZ4 ||               \
           (compress) == ZIO_COMPRESS_GZIP_1 ||            \
           (compress) == ZIO_COMPRESS_GZIP_2 ||            \
           (compress) == ZIO_COMPRESS_GZIP_3 ||            \
           (compress) == ZIO_COMPRESS_GZIP_4 ||            \
           (compress) == ZIO_COMPRESS_GZIP_5 ||            \
           (compress) == ZIO_COMPRESS_GZIP_6 ||            \
           (compress) == ZIO_COMPRESS_GZIP_7 ||            \
           (compress) == ZIO_COMPRESS_GZIP_8 ||            \
           (compress) == ZIO_COMPRESS_GZIP_9 ||            \
           (compress) == ZIO_COMPRESS_ZLE ||               \
           (compress) == ZIO_COMPRESS_ZSTD ||              \
           (compress) == ZIO_COMPRESS_ON ||                \
           (compress) == ZIO_COMPRESS_OFF)
   
   
   #define ZIO_COMPRESS_ALGO(x)    (x & SPA_COMPRESSMASK)
   #define ZIO_COMPRESS_LEVEL(x)   ((x & ~SPA_COMPRESSMASK) >> SPA_COMPRESSBITS)
   #define ZIO_COMPRESS_RAW(type, level)   (type | ((level) << SPA_COMPRESSBITS))
   
   #define ZIO_COMPLEVEL_ZSTD(level)       \
           ZIO_COMPRESS_RAW(ZIO_COMPRESS_ZSTD, level)
   
   #define ZIO_FAILURE_MODE_WAIT           0
   #define ZIO_FAILURE_MODE_CONTINUE       1
   #define ZIO_FAILURE_MODE_PANIC          2
   
   typedef enum zio_suspend_reason {
           ZIO_SUSPEND_NONE = 0,
           ZIO_SUSPEND_IOERR,
           ZIO_SUSPEND_MMP,
   } zio_suspend_reason_t;
   
   /*
    * This was originally an enum type. However, those are 32-bit and there is no
    * way to make a 64-bit enum type. Since we ran out of bits for flags, we were
    * forced to upgrade it to a uint64_t.
    */
   typedef uint64_t zio_flag_t;
           /*
            * Flags inherited by gang, ddt, and vdev children,
            * and that must be equal for two zios to aggregate
            */
   #define ZIO_FLAG_DONT_AGGREGATE (1ULL << 0)
   #define ZIO_FLAG_IO_REPAIR      (1ULL << 1)
   #define ZIO_FLAG_SELF_HEAL      (1ULL << 2)
   #define ZIO_FLAG_RESILVER       (1ULL << 3)
   #define ZIO_FLAG_SCRUB          (1ULL << 4)
   #define ZIO_FLAG_SCAN_THREAD    (1ULL << 5)
   #define ZIO_FLAG_PHYSICAL       (1ULL << 6)
   
   #define ZIO_FLAG_AGG_INHERIT    (ZIO_FLAG_CANFAIL - 1)
   
           /*
            * Flags inherited by ddt, gang, and vdev children.
            */
   #define ZIO_FLAG_CANFAIL        (1ULL << 7)     /* must be first for INHERIT */
   #define ZIO_FLAG_SPECULATIVE    (1ULL << 8)
   #define ZIO_FLAG_CONFIG_WRITER  (1ULL << 9)
   #define ZIO_FLAG_DONT_RETRY     (1ULL << 10)
   #define ZIO_FLAG_DONT_CACHE     (1ULL << 11)
   #define ZIO_FLAG_NODATA         (1ULL << 12)
   #define ZIO_FLAG_INDUCE_DAMAGE  (1ULL << 13)
   #define ZIO_FLAG_IO_ALLOCATING  (1ULL << 14)
   
   #define ZIO_FLAG_DDT_INHERIT    (ZIO_FLAG_IO_RETRY - 1)
   #define ZIO_FLAG_GANG_INHERIT   (ZIO_FLAG_IO_RETRY - 1)
   
           /*
            * Flags inherited by vdev children.
            */
   #define ZIO_FLAG_IO_RETRY       (1ULL << 15)    /* must be first for INHERIT */
   #define ZIO_FLAG_PROBE          (1ULL << 16)
   #define ZIO_FLAG_TRYHARD        (1ULL << 17)
   #define ZIO_FLAG_OPTIONAL       (1ULL << 18)
   
   #define ZIO_FLAG_VDEV_INHERIT   (ZIO_FLAG_DONT_QUEUE - 1)
   
           /*
            * Flags not inherited by any children.
            */
   #define ZIO_FLAG_DONT_QUEUE     (1ULL << 19)    /* must be first for INHERIT */
   #define ZIO_FLAG_DONT_PROPAGATE (1ULL << 20)
   #define ZIO_FLAG_IO_BYPASS      (1ULL << 21)
   #define ZIO_FLAG_IO_REWRITE     (1ULL << 22)
   #define ZIO_FLAG_RAW_COMPRESS   (1ULL << 23)
   #define ZIO_FLAG_RAW_ENCRYPT    (1ULL << 24)
   #define ZIO_FLAG_GANG_CHILD     (1ULL << 25)
   #define ZIO_FLAG_DDT_CHILD      (1ULL << 26)
   #define ZIO_FLAG_GODFATHER      (1ULL << 27)
   #define ZIO_FLAG_NOPWRITE       (1ULL << 28)
   #define ZIO_FLAG_REEXECUTED     (1ULL << 29)
   #define ZIO_FLAG_DELEGATED      (1ULL << 30)
   #define ZIO_FLAG_FASTWRITE      (1ULL << 31)
   
   #define ZIO_FLAG_MUSTSUCCEED            0
   #define ZIO_FLAG_RAW    (ZIO_FLAG_RAW_COMPRESS | ZIO_FLAG_RAW_ENCRYPT)
   
   #define ZIO_DDT_CHILD_FLAGS(zio)                                \
           (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) |             \
           ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
   
   #define ZIO_GANG_CHILD_FLAGS(zio)                               \
           (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) |            \
           ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
   
   #define ZIO_VDEV_CHILD_FLAGS(zio)                               \
           (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) |            \
           ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_CANFAIL)
   
   #define ZIO_CHILD_BIT(x)                (1U << (x))
   #define ZIO_CHILD_BIT_IS_SET(val, x)    ((val) & (1U << (x)))
   
   enum zio_child {
           ZIO_CHILD_VDEV = 0,
           ZIO_CHILD_GANG,
           ZIO_CHILD_DDT,
           ZIO_CHILD_LOGICAL,
           ZIO_CHILD_TYPES
   };
   
   #define ZIO_CHILD_VDEV_BIT              ZIO_CHILD_BIT(ZIO_CHILD_VDEV)
   #define ZIO_CHILD_GANG_BIT              ZIO_CHILD_BIT(ZIO_CHILD_GANG)
   #define ZIO_CHILD_DDT_BIT               ZIO_CHILD_BIT(ZIO_CHILD_DDT)
   #define ZIO_CHILD_LOGICAL_BIT           ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL)
   #define ZIO_CHILD_ALL_BITS                                      \
           (ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT |              \
           ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT)
   
   enum zio_wait_type {
           ZIO_WAIT_READY = 0,
           ZIO_WAIT_DONE,
           ZIO_WAIT_TYPES
   };
   
   typedef void zio_done_func_t(zio_t *zio);
   
   extern int zio_exclude_metadata;
   extern int zio_dva_throttle_enabled;
   extern const char *const zio_type_name[ZIO_TYPES];
   
   /*
    * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
    * identifies any block in the pool.  By convention, the meta-objset (MOS)
    * is objset 0, and the meta-dnode is object 0.  This covers all blocks
    * except root blocks and ZIL blocks, which are defined as follows:
    *
    * Root blocks (objset_phys_t) are object 0, level -1:  <objset, 0, -1, 0>.
    * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
    * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
    * dnode visit bookmarks are <objset, object id of dnode, -3, 0>.
    *
    * Note: this structure is called a bookmark because its original purpose
    * was to remember where to resume a pool-wide traverse.
    *
    * Note: this structure is passed between userland and the kernel, and is
    * stored on disk (by virtue of being incorporated into other on-disk
    * structures, e.g. dsl_scan_phys_t).
    *
    * If the head_errlog feature is enabled a different on-disk format for error
    * logs is used. This introduces the use of an error bookmark, a four-tuple
    * <object, level, blkid, birth> that uniquely identifies any error block
    * in the pool. The birth transaction group is used to track whether the block
    * has been overwritten by newer data or added to a snapshot since its marking
    * as an error.
    */
   struct zbookmark_phys {
           uint64_t        zb_objset;
           uint64_t        zb_object;
           int64_t         zb_level;
           uint64_t        zb_blkid;
   };
   
   typedef struct zbookmark_err_phys {
           uint64_t        zb_object;
           int64_t         zb_level;
           uint64_t        zb_blkid;
           uint64_t        zb_birth;
   } zbookmark_err_phys_t;
   
   #define SET_BOOKMARK(zb, objset, object, level, blkid)  \
   {                                                       \
           (zb)->zb_objset = objset;                       \
           (zb)->zb_object = object;                       \
           (zb)->zb_level = level;                         \
           (zb)->zb_blkid = blkid;                         \
   }
   
   #define ZB_DESTROYED_OBJSET     (-1ULL)
   
   #define ZB_ROOT_OBJECT          (0ULL)
   #define ZB_ROOT_LEVEL           (-1LL)
   #define ZB_ROOT_BLKID           (0ULL)
   
   #define ZB_ZIL_OBJECT           (0ULL)
   #define ZB_ZIL_LEVEL            (-2LL)
   
   #define ZB_DNODE_LEVEL          (-3LL)
   #define ZB_DNODE_BLKID          (0ULL)
   
   #define ZB_IS_ZERO(zb)                                          \
           ((zb)->zb_objset == 0 && (zb)->zb_object == 0 &&        \
           (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
   #define ZB_IS_ROOT(zb)                          \
           ((zb)->zb_object == ZB_ROOT_OBJECT &&   \
           (zb)->zb_level == ZB_ROOT_LEVEL &&      \
           (zb)->zb_blkid == ZB_ROOT_BLKID)
   
   typedef struct zio_prop {
           enum zio_checksum       zp_checksum;
           enum zio_compress       zp_compress;
           uint8_t                 zp_complevel;
           dmu_object_type_t       zp_type;
           uint8_t                 zp_level;
           uint8_t                 zp_copies;
           boolean_t               zp_dedup;
           boolean_t               zp_dedup_verify;
           boolean_t               zp_nopwrite;
           boolean_t               zp_encrypt;
           boolean_t               zp_byteorder;
           uint8_t                 zp_salt[ZIO_DATA_SALT_LEN];
           uint8_t                 zp_iv[ZIO_DATA_IV_LEN];
           uint8_t                 zp_mac[ZIO_DATA_MAC_LEN];
           uint32_t                zp_zpl_smallblk;
   } zio_prop_t;
   
   typedef struct zio_cksum_report zio_cksum_report_t;
   
   typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
       const abd_t *good_data);
   typedef void zio_cksum_free_f(void *cbdata, size_t size);
   
   struct zio_bad_cksum;                           /* defined in zio_checksum.h */
   struct dnode_phys;
   struct abd;
   
   struct zio_cksum_report {
           struct zio_cksum_report *zcr_next;
           nvlist_t                *zcr_ereport;
           nvlist_t                *zcr_detector;
           void                    *zcr_cbdata;
           size_t                  zcr_cbinfo;     /* passed to zcr_free() */
           uint64_t                zcr_sector;
           uint64_t                zcr_align;
           uint64_t                zcr_length;
           zio_cksum_finish_f      *zcr_finish;
           zio_cksum_free_f        *zcr_free;
   
           /* internal use only */
           struct zio_bad_cksum    *zcr_ckinfo;    /* information from failure */
   };
   
   typedef struct zio_vsd_ops {
           zio_done_func_t         *vsd_free;
   } zio_vsd_ops_t;
   
   typedef struct zio_gang_node {
           zio_gbh_phys_t          *gn_gbh;
           struct zio_gang_node    *gn_child[SPA_GBH_NBLKPTRS];
   } zio_gang_node_t;
   
   typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
       zio_gang_node_t *gn, struct abd *data, uint64_t offset);
   
   typedef void zio_transform_func_t(zio_t *zio, struct abd *data, uint64_t size);
   
   typedef struct zio_transform {
           struct abd              *zt_orig_abd;
           uint64_t                zt_orig_size;
           uint64_t                zt_bufsize;
           zio_transform_func_t    *zt_transform;
           struct zio_transform    *zt_next;
   } zio_transform_t;
   
   typedef zio_t *zio_pipe_stage_t(zio_t *zio);
   
   /*
    * The io_reexecute flags are distinct from io_flags because the child must
    * be able to propagate them to the parent.  The normal io_flags are local
    * to the zio, not protected by any lock, and not modifiable by children;
    * the reexecute flags are protected by io_lock, modifiable by children,
    * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
    */
   #define ZIO_REEXECUTE_NOW       0x01
   #define ZIO_REEXECUTE_SUSPEND   0x02
   
   /*
    * The io_trim flags are used to specify the type of TRIM to perform.  They
    * only apply to ZIO_TYPE_TRIM zios are distinct from io_flags.
    */
   enum trim_flag {
           ZIO_TRIM_SECURE         = 1U << 0,
   };
   
   typedef struct zio_alloc_list {
           list_t  zal_list;
           uint64_t zal_size;
   } zio_alloc_list_t;
   
   typedef struct zio_link {
           zio_t           *zl_parent;
           zio_t           *zl_child;
           list_node_t     zl_parent_node;
           list_node_t     zl_child_node;
   } zio_link_t;
   
   struct zio {
           /* Core information about this I/O */
           zbookmark_phys_t        io_bookmark;
           zio_prop_t      io_prop;
           zio_type_t      io_type;
           enum zio_child  io_child_type;
           enum trim_flag  io_trim_flags;
           int             io_cmd;
           zio_priority_t  io_priority;
           uint8_t         io_reexecute;
           uint8_t         io_state[ZIO_WAIT_TYPES];
           uint64_t        io_txg;
           spa_t           *io_spa;
           blkptr_t        *io_bp;
           blkptr_t        *io_bp_override;
           blkptr_t        io_bp_copy;
           list_t          io_parent_list;
           list_t          io_child_list;
           zio_t           *io_logical;
           zio_transform_t *io_transform_stack;
   
           /* Callback info */
           zio_done_func_t *io_ready;
           zio_done_func_t *io_children_ready;
           zio_done_func_t *io_physdone;
           zio_done_func_t *io_done;
           void            *io_private;
           int64_t         io_prev_space_delta;    /* DMU private */
           blkptr_t        io_bp_orig;
           /* io_lsize != io_orig_size iff this is a raw write */
           uint64_t        io_lsize;
   
           /* Data represented by this I/O */
           struct abd      *io_abd;
           struct abd      *io_orig_abd;
           uint64_t        io_size;
           uint64_t        io_orig_size;
   
           /* Stuff for the vdev stack */
           vdev_t          *io_vd;
           void            *io_vsd;
           const zio_vsd_ops_t *io_vsd_ops;
           metaslab_class_t *io_metaslab_class;    /* dva throttle class */
   
           uint64_t        io_offset;
           hrtime_t        io_timestamp;   /* submitted at */
           hrtime_t        io_queued_timestamp;
           hrtime_t        io_target_timestamp;
           hrtime_t        io_delta;       /* vdev queue service delta */
           hrtime_t        io_delay;       /* Device access time (disk or */
                                           /* file). */
           avl_node_t      io_queue_node;
           avl_node_t      io_offset_node;
           avl_node_t      io_alloc_node;
           zio_alloc_list_t        io_alloc_list;
   
           /* Internal pipeline state */
           zio_flag_t      io_flags;
           enum zio_stage  io_stage;
           enum zio_stage  io_pipeline;
           zio_flag_t      io_orig_flags;
           enum zio_stage  io_orig_stage;
           enum zio_stage  io_orig_pipeline;
           enum zio_stage  io_pipeline_trace;
           int             io_error;
           int             io_child_error[ZIO_CHILD_TYPES];
           uint64_t        io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
           uint64_t        io_child_count;
           uint64_t        io_phys_children;
           uint64_t        io_parent_count;
           uint64_t        *io_stall;
           zio_t           *io_gang_leader;
           zio_gang_node_t *io_gang_tree;
           void            *io_executor;
           void            *io_waiter;
           void            *io_bio;
           kmutex_t        io_lock;
           kcondvar_t      io_cv;
           int             io_allocator;
   
           /* FMA state */
           zio_cksum_report_t *io_cksum_report;
           uint64_t        io_ena;
   
           /* Taskq dispatching state */
           taskq_ent_t     io_tqent;
   };
   
   enum blk_verify_flag {
           BLK_VERIFY_ONLY,
           BLK_VERIFY_LOG,
           BLK_VERIFY_HALT
   };
   
   extern int zio_bookmark_compare(const void *, const void *);
   
   extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
       zio_done_func_t *done, void *priv, zio_flag_t flags);
   
   extern zio_t *zio_root(spa_t *spa,
       zio_done_func_t *done, void *priv, zio_flag_t flags);
   
   extern void zio_destroy(zio_t *zio);
   
   extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
       struct abd *data, uint64_t lsize, zio_done_func_t *done, void *priv,
       zio_priority_t priority, zio_flag_t flags, const zbookmark_phys_t *zb);
   
   extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
       struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp,
       zio_done_func_t *ready, zio_done_func_t *children_ready,
       zio_done_func_t *physdone, zio_done_func_t *done,
       void *priv, zio_priority_t priority, zio_flag_t flags,
       const zbookmark_phys_t *zb);
   
   extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
       struct abd *data, uint64_t size, zio_done_func_t *done, void *priv,
       zio_priority_t priority, zio_flag_t flags, zbookmark_phys_t *zb);
   
   extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
       boolean_t nopwrite);
   
   extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
   
   extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
       const blkptr_t *bp,
       zio_done_func_t *done, void *priv, zio_flag_t flags);
   
   extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
       zio_done_func_t *done, void *priv, zio_flag_t flags);
   
   extern zio_t *zio_trim(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size,
       zio_done_func_t *done, void *priv, zio_priority_t priority,
       zio_flag_t flags, enum trim_flag trim_flags);
   
   extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
       uint64_t size, struct abd *data, int checksum,
       zio_done_func_t *done, void *priv, zio_priority_t priority,
       zio_flag_t flags, boolean_t labels);
   
   extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
       uint64_t size, struct abd *data, int checksum,
       zio_done_func_t *done, void *priv, zio_priority_t priority,
       zio_flag_t flags, boolean_t labels);
   
   extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
       const blkptr_t *bp, zio_flag_t flags);
   
   extern int zio_alloc_zil(spa_t *spa, objset_t *os, uint64_t txg,
       blkptr_t *new_bp, uint64_t size, boolean_t *slog);
   extern void zio_flush(zio_t *zio, vdev_t *vd);
   extern void zio_shrink(zio_t *zio, uint64_t size);
   
   extern int zio_wait(zio_t *zio);
   extern void zio_nowait(zio_t *zio);
   extern void zio_execute(void *zio);
   extern void zio_interrupt(void *zio);
   extern void zio_delay_init(zio_t *zio);
   extern void zio_delay_interrupt(zio_t *zio);
   extern void zio_deadman(zio_t *zio, const char *tag);
   
   extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **);
   extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **);
   extern zio_t *zio_unique_parent(zio_t *cio);
   extern void zio_add_child(zio_t *pio, zio_t *cio);
   
   extern void *zio_buf_alloc(size_t size);
   extern void zio_buf_free(void *buf, size_t size);
   extern void *zio_data_buf_alloc(size_t size);
   extern void zio_data_buf_free(void *buf, size_t size);
   
   extern void zio_push_transform(zio_t *zio, struct abd *abd, uint64_t size,
       uint64_t bufsize, zio_transform_func_t *transform);
   extern void zio_pop_transforms(zio_t *zio);
   
   extern void zio_resubmit_stage_async(void *);
   
   extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
       uint64_t offset, struct abd *data, uint64_t size, int type,
       zio_priority_t priority, zio_flag_t flags,
       zio_done_func_t *done, void *priv);
   
   extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
       struct abd *data, uint64_t size, zio_type_t type, zio_priority_t priority,
       zio_flag_t flags, zio_done_func_t *done, void *priv);
   
   extern void zio_vdev_io_bypass(zio_t *zio);
   extern void zio_vdev_io_reissue(zio_t *zio);
   extern void zio_vdev_io_redone(zio_t *zio);
   
   extern void zio_change_priority(zio_t *pio, zio_priority_t priority);
   
   extern void zio_checksum_verified(zio_t *zio);
   extern int zio_worst_error(int e1, int e2);
   
   extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
       enum zio_checksum parent);
   extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
       enum zio_checksum child, enum zio_checksum parent);
   extern enum zio_compress zio_compress_select(spa_t *spa,
       enum zio_compress child, enum zio_compress parent);
   extern uint8_t zio_complevel_select(spa_t *spa, enum zio_compress compress,
       uint8_t child, uint8_t parent);
   
   extern void zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t);
   extern int zio_resume(spa_t *spa);
   extern void zio_resume_wait(spa_t *spa);
   
   extern boolean_t zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp,
       boolean_t config_held, enum blk_verify_flag blk_verify);
   
   /*
    * Initial setup and teardown.
    */
   extern void zio_init(void);
   extern void zio_fini(void);
   
   /*
    * Fault injection
    */
   struct zinject_record;
   extern uint32_t zio_injection_enabled;
   extern int zio_inject_fault(char *name, int flags, int *id,
       struct zinject_record *record);
   extern int zio_inject_list_next(int *id, char *name, size_t buflen,
       struct zinject_record *record);
   extern int zio_clear_fault(int id);
   extern void zio_handle_panic_injection(spa_t *spa, const char *tag,
       uint64_t type);
   extern int zio_handle_decrypt_injection(spa_t *spa, const zbookmark_phys_t *zb,
       uint64_t type, int error);
   extern int zio_handle_fault_injection(zio_t *zio, int error);
   extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
   extern int zio_handle_device_injections(vdev_t *vd, zio_t *zio, int err1,
       int err2);
   extern int zio_handle_label_injection(zio_t *zio, int error);
   extern void zio_handle_ignored_writes(zio_t *zio);
   extern hrtime_t zio_handle_io_delay(zio_t *zio);
   
   /*
    * Checksum ereport functions
    */
   extern int zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd,
       const zbookmark_phys_t *zb, struct zio *zio, uint64_t offset,
       uint64_t length, struct zio_bad_cksum *info);
   extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
       const abd_t *good_data, const abd_t *bad_data, boolean_t drop_if_identical);
   
   extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
   
   /* If we have the good data in hand, this function can be used */
   extern int zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
       const zbookmark_phys_t *zb, struct zio *zio, uint64_t offset,
       uint64_t length, const abd_t *good_data, const abd_t *bad_data,
       struct zio_bad_cksum *info);
   
   void zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr);
   extern void zfs_ereport_snapshot_post(const char *subclass, spa_t *spa,
       const char *name);
   
   /* Called from spa_sync(), but primarily an injection handler */
   extern void spa_handle_ignored_writes(spa_t *spa);
   
   /* zbookmark_phys functions */
   boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp,
       const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
   boolean_t zbookmark_subtree_tbd(const struct dnode_phys *dnp,
       const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
   int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2,
       uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif  /* _ZIO_H */

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