The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/contrib/openzfs/include/sys/zio.h

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    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 https://opensource.org/licenses/CDDL-1.0.
   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 /*
   23  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
   24  * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
   25  * Copyright (c) 2012, 2020 by Delphix. All rights reserved.
   26  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
   27  * Copyright (c) 2013, Joyent, Inc. All rights reserved.
   28  * Copyright 2016 Toomas Soome <tsoome@me.com>
   29  * Copyright (c) 2019, Allan Jude
   30  * Copyright (c) 2019, Klara Inc.
   31  * Copyright (c) 2019-2020, Michael Niewöhner
   32  */
   33 
   34 #ifndef _ZIO_H
   35 #define _ZIO_H
   36 
   37 #include <sys/zio_priority.h>
   38 #include <sys/zfs_context.h>
   39 #include <sys/spa.h>
   40 #include <sys/txg.h>
   41 #include <sys/avl.h>
   42 #include <sys/fs/zfs.h>
   43 #include <sys/zio_impl.h>
   44 
   45 #ifdef  __cplusplus
   46 extern "C" {
   47 #endif
   48 
   49 /*
   50  * Embedded checksum
   51  */
   52 #define ZEC_MAGIC       0x210da7ab10c7a11ULL
   53 
   54 typedef struct zio_eck {
   55         uint64_t        zec_magic;      /* for validation, endianness   */
   56         zio_cksum_t     zec_cksum;      /* 256-bit checksum             */
   57 } zio_eck_t;
   58 
   59 /*
   60  * Gang block headers are self-checksumming and contain an array
   61  * of block pointers.
   62  */
   63 #define SPA_GANGBLOCKSIZE       SPA_MINBLOCKSIZE
   64 #define SPA_GBH_NBLKPTRS        ((SPA_GANGBLOCKSIZE - \
   65         sizeof (zio_eck_t)) / sizeof (blkptr_t))
   66 #define SPA_GBH_FILLER          ((SPA_GANGBLOCKSIZE - \
   67         sizeof (zio_eck_t) - \
   68         (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
   69         sizeof (uint64_t))
   70 
   71 typedef struct zio_gbh {
   72         blkptr_t                zg_blkptr[SPA_GBH_NBLKPTRS];
   73         uint64_t                zg_filler[SPA_GBH_FILLER];
   74         zio_eck_t               zg_tail;
   75 } zio_gbh_phys_t;
   76 
   77 enum zio_checksum {
   78         ZIO_CHECKSUM_INHERIT = 0,
   79         ZIO_CHECKSUM_ON,
   80         ZIO_CHECKSUM_OFF,
   81         ZIO_CHECKSUM_LABEL,
   82         ZIO_CHECKSUM_GANG_HEADER,
   83         ZIO_CHECKSUM_ZILOG,
   84         ZIO_CHECKSUM_FLETCHER_2,
   85         ZIO_CHECKSUM_FLETCHER_4,
   86         ZIO_CHECKSUM_SHA256,
   87         ZIO_CHECKSUM_ZILOG2,
   88         ZIO_CHECKSUM_NOPARITY,
   89         ZIO_CHECKSUM_SHA512,
   90         ZIO_CHECKSUM_SKEIN,
   91         ZIO_CHECKSUM_EDONR,
   92         ZIO_CHECKSUM_BLAKE3,
   93         ZIO_CHECKSUM_FUNCTIONS
   94 };
   95 
   96 /*
   97  * The number of "legacy" compression functions which can be set on individual
   98  * objects.
   99  */
  100 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2
  101 
  102 #define ZIO_CHECKSUM_ON_VALUE   ZIO_CHECKSUM_FLETCHER_4
  103 #define ZIO_CHECKSUM_DEFAULT    ZIO_CHECKSUM_ON
  104 
  105 #define ZIO_CHECKSUM_MASK       0xffULL
  106 #define ZIO_CHECKSUM_VERIFY     (1U << 8)
  107 
  108 #define ZIO_DEDUPCHECKSUM       ZIO_CHECKSUM_SHA256
  109 
  110 /* macros defining encryption lengths */
  111 #define ZIO_OBJSET_MAC_LEN              32
  112 #define ZIO_DATA_IV_LEN                 12
  113 #define ZIO_DATA_SALT_LEN               8
  114 #define ZIO_DATA_MAC_LEN                16
  115 
  116 /*
  117  * The number of "legacy" compression functions which can be set on individual
  118  * objects.
  119  */
  120 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
  121 
  122 /*
  123  * The meaning of "compress = on" selected by the compression features enabled
  124  * on a given pool.
  125  */
  126 #define ZIO_COMPRESS_LEGACY_ON_VALUE    ZIO_COMPRESS_LZJB
  127 #define ZIO_COMPRESS_LZ4_ON_VALUE       ZIO_COMPRESS_LZ4
  128 
  129 #define ZIO_COMPRESS_DEFAULT            ZIO_COMPRESS_ON
  130 
  131 #define BOOTFS_COMPRESS_VALID(compress)                 \
  132         ((compress) == ZIO_COMPRESS_LZJB ||             \
  133         (compress) == ZIO_COMPRESS_LZ4 ||               \
  134         (compress) == ZIO_COMPRESS_GZIP_1 ||            \
  135         (compress) == ZIO_COMPRESS_GZIP_2 ||            \
  136         (compress) == ZIO_COMPRESS_GZIP_3 ||            \
  137         (compress) == ZIO_COMPRESS_GZIP_4 ||            \
  138         (compress) == ZIO_COMPRESS_GZIP_5 ||            \
  139         (compress) == ZIO_COMPRESS_GZIP_6 ||            \
  140         (compress) == ZIO_COMPRESS_GZIP_7 ||            \
  141         (compress) == ZIO_COMPRESS_GZIP_8 ||            \
  142         (compress) == ZIO_COMPRESS_GZIP_9 ||            \
  143         (compress) == ZIO_COMPRESS_ZLE ||               \
  144         (compress) == ZIO_COMPRESS_ZSTD ||              \
  145         (compress) == ZIO_COMPRESS_ON ||                \
  146         (compress) == ZIO_COMPRESS_OFF)
  147 
  148 
  149 #define ZIO_COMPRESS_ALGO(x)    (x & SPA_COMPRESSMASK)
  150 #define ZIO_COMPRESS_LEVEL(x)   ((x & ~SPA_COMPRESSMASK) >> SPA_COMPRESSBITS)
  151 #define ZIO_COMPRESS_RAW(type, level)   (type | ((level) << SPA_COMPRESSBITS))
  152 
  153 #define ZIO_COMPLEVEL_ZSTD(level)       \
  154         ZIO_COMPRESS_RAW(ZIO_COMPRESS_ZSTD, level)
  155 
  156 #define ZIO_FAILURE_MODE_WAIT           0
  157 #define ZIO_FAILURE_MODE_CONTINUE       1
  158 #define ZIO_FAILURE_MODE_PANIC          2
  159 
  160 typedef enum zio_suspend_reason {
  161         ZIO_SUSPEND_NONE = 0,
  162         ZIO_SUSPEND_IOERR,
  163         ZIO_SUSPEND_MMP,
  164 } zio_suspend_reason_t;
  165 
  166 /*
  167  * This was originally an enum type. However, those are 32-bit and there is no
  168  * way to make a 64-bit enum type. Since we ran out of bits for flags, we were
  169  * forced to upgrade it to a uint64_t.
  170  */
  171 typedef uint64_t zio_flag_t;
  172         /*
  173          * Flags inherited by gang, ddt, and vdev children,
  174          * and that must be equal for two zios to aggregate
  175          */
  176 #define ZIO_FLAG_DONT_AGGREGATE (1ULL << 0)
  177 #define ZIO_FLAG_IO_REPAIR      (1ULL << 1)
  178 #define ZIO_FLAG_SELF_HEAL      (1ULL << 2)
  179 #define ZIO_FLAG_RESILVER       (1ULL << 3)
  180 #define ZIO_FLAG_SCRUB          (1ULL << 4)
  181 #define ZIO_FLAG_SCAN_THREAD    (1ULL << 5)
  182 #define ZIO_FLAG_PHYSICAL       (1ULL << 6)
  183 
  184 #define ZIO_FLAG_AGG_INHERIT    (ZIO_FLAG_CANFAIL - 1)
  185 
  186         /*
  187          * Flags inherited by ddt, gang, and vdev children.
  188          */
  189 #define ZIO_FLAG_CANFAIL        (1ULL << 7)     /* must be first for INHERIT */
  190 #define ZIO_FLAG_SPECULATIVE    (1ULL << 8)
  191 #define ZIO_FLAG_CONFIG_WRITER  (1ULL << 9)
  192 #define ZIO_FLAG_DONT_RETRY     (1ULL << 10)
  193 #define ZIO_FLAG_DONT_CACHE     (1ULL << 11)
  194 #define ZIO_FLAG_NODATA         (1ULL << 12)
  195 #define ZIO_FLAG_INDUCE_DAMAGE  (1ULL << 13)
  196 #define ZIO_FLAG_IO_ALLOCATING  (1ULL << 14)
  197 
  198 #define ZIO_FLAG_DDT_INHERIT    (ZIO_FLAG_IO_RETRY - 1)
  199 #define ZIO_FLAG_GANG_INHERIT   (ZIO_FLAG_IO_RETRY - 1)
  200 
  201         /*
  202          * Flags inherited by vdev children.
  203          */
  204 #define ZIO_FLAG_IO_RETRY       (1ULL << 15)    /* must be first for INHERIT */
  205 #define ZIO_FLAG_PROBE          (1ULL << 16)
  206 #define ZIO_FLAG_TRYHARD        (1ULL << 17)
  207 #define ZIO_FLAG_OPTIONAL       (1ULL << 18)
  208 
  209 #define ZIO_FLAG_VDEV_INHERIT   (ZIO_FLAG_DONT_QUEUE - 1)
  210 
  211         /*
  212          * Flags not inherited by any children.
  213          */
  214 #define ZIO_FLAG_DONT_QUEUE     (1ULL << 19)    /* must be first for INHERIT */
  215 #define ZIO_FLAG_DONT_PROPAGATE (1ULL << 20)
  216 #define ZIO_FLAG_IO_BYPASS      (1ULL << 21)
  217 #define ZIO_FLAG_IO_REWRITE     (1ULL << 22)
  218 #define ZIO_FLAG_RAW_COMPRESS   (1ULL << 23)
  219 #define ZIO_FLAG_RAW_ENCRYPT    (1ULL << 24)
  220 #define ZIO_FLAG_GANG_CHILD     (1ULL << 25)
  221 #define ZIO_FLAG_DDT_CHILD      (1ULL << 26)
  222 #define ZIO_FLAG_GODFATHER      (1ULL << 27)
  223 #define ZIO_FLAG_NOPWRITE       (1ULL << 28)
  224 #define ZIO_FLAG_REEXECUTED     (1ULL << 29)
  225 #define ZIO_FLAG_DELEGATED      (1ULL << 30)
  226 #define ZIO_FLAG_FASTWRITE      (1ULL << 31)
  227 
  228 #define ZIO_FLAG_MUSTSUCCEED            0
  229 #define ZIO_FLAG_RAW    (ZIO_FLAG_RAW_COMPRESS | ZIO_FLAG_RAW_ENCRYPT)
  230 
  231 #define ZIO_DDT_CHILD_FLAGS(zio)                                \
  232         (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) |             \
  233         ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
  234 
  235 #define ZIO_GANG_CHILD_FLAGS(zio)                               \
  236         (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) |            \
  237         ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
  238 
  239 #define ZIO_VDEV_CHILD_FLAGS(zio)                               \
  240         (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) |            \
  241         ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_CANFAIL)
  242 
  243 #define ZIO_CHILD_BIT(x)                (1U << (x))
  244 #define ZIO_CHILD_BIT_IS_SET(val, x)    ((val) & (1U << (x)))
  245 
  246 enum zio_child {
  247         ZIO_CHILD_VDEV = 0,
  248         ZIO_CHILD_GANG,
  249         ZIO_CHILD_DDT,
  250         ZIO_CHILD_LOGICAL,
  251         ZIO_CHILD_TYPES
  252 };
  253 
  254 #define ZIO_CHILD_VDEV_BIT              ZIO_CHILD_BIT(ZIO_CHILD_VDEV)
  255 #define ZIO_CHILD_GANG_BIT              ZIO_CHILD_BIT(ZIO_CHILD_GANG)
  256 #define ZIO_CHILD_DDT_BIT               ZIO_CHILD_BIT(ZIO_CHILD_DDT)
  257 #define ZIO_CHILD_LOGICAL_BIT           ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL)
  258 #define ZIO_CHILD_ALL_BITS                                      \
  259         (ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT |              \
  260         ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT)
  261 
  262 enum zio_wait_type {
  263         ZIO_WAIT_READY = 0,
  264         ZIO_WAIT_DONE,
  265         ZIO_WAIT_TYPES
  266 };
  267 
  268 typedef void zio_done_func_t(zio_t *zio);
  269 
  270 extern int zio_exclude_metadata;
  271 extern int zio_dva_throttle_enabled;
  272 extern const char *const zio_type_name[ZIO_TYPES];
  273 
  274 /*
  275  * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
  276  * identifies any block in the pool.  By convention, the meta-objset (MOS)
  277  * is objset 0, and the meta-dnode is object 0.  This covers all blocks
  278  * except root blocks and ZIL blocks, which are defined as follows:
  279  *
  280  * Root blocks (objset_phys_t) are object 0, level -1:  <objset, 0, -1, 0>.
  281  * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
  282  * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
  283  * dnode visit bookmarks are <objset, object id of dnode, -3, 0>.
  284  *
  285  * Note: this structure is called a bookmark because its original purpose
  286  * was to remember where to resume a pool-wide traverse.
  287  *
  288  * Note: this structure is passed between userland and the kernel, and is
  289  * stored on disk (by virtue of being incorporated into other on-disk
  290  * structures, e.g. dsl_scan_phys_t).
  291  *
  292  * If the head_errlog feature is enabled a different on-disk format for error
  293  * logs is used. This introduces the use of an error bookmark, a four-tuple
  294  * <object, level, blkid, birth> that uniquely identifies any error block
  295  * in the pool. The birth transaction group is used to track whether the block
  296  * has been overwritten by newer data or added to a snapshot since its marking
  297  * as an error.
  298  */
  299 struct zbookmark_phys {
  300         uint64_t        zb_objset;
  301         uint64_t        zb_object;
  302         int64_t         zb_level;
  303         uint64_t        zb_blkid;
  304 };
  305 
  306 typedef struct zbookmark_err_phys {
  307         uint64_t        zb_object;
  308         int64_t         zb_level;
  309         uint64_t        zb_blkid;
  310         uint64_t        zb_birth;
  311 } zbookmark_err_phys_t;
  312 
  313 #define SET_BOOKMARK(zb, objset, object, level, blkid)  \
  314 {                                                       \
  315         (zb)->zb_objset = objset;                       \
  316         (zb)->zb_object = object;                       \
  317         (zb)->zb_level = level;                         \
  318         (zb)->zb_blkid = blkid;                         \
  319 }
  320 
  321 #define ZB_DESTROYED_OBJSET     (-1ULL)
  322 
  323 #define ZB_ROOT_OBJECT          (0ULL)
  324 #define ZB_ROOT_LEVEL           (-1LL)
  325 #define ZB_ROOT_BLKID           (0ULL)
  326 
  327 #define ZB_ZIL_OBJECT           (0ULL)
  328 #define ZB_ZIL_LEVEL            (-2LL)
  329 
  330 #define ZB_DNODE_LEVEL          (-3LL)
  331 #define ZB_DNODE_BLKID          (0ULL)
  332 
  333 #define ZB_IS_ZERO(zb)                                          \
  334         ((zb)->zb_objset == 0 && (zb)->zb_object == 0 &&        \
  335         (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
  336 #define ZB_IS_ROOT(zb)                          \
  337         ((zb)->zb_object == ZB_ROOT_OBJECT &&   \
  338         (zb)->zb_level == ZB_ROOT_LEVEL &&      \
  339         (zb)->zb_blkid == ZB_ROOT_BLKID)
  340 
  341 typedef struct zio_prop {
  342         enum zio_checksum       zp_checksum;
  343         enum zio_compress       zp_compress;
  344         uint8_t                 zp_complevel;
  345         dmu_object_type_t       zp_type;
  346         uint8_t                 zp_level;
  347         uint8_t                 zp_copies;
  348         boolean_t               zp_dedup;
  349         boolean_t               zp_dedup_verify;
  350         boolean_t               zp_nopwrite;
  351         boolean_t               zp_encrypt;
  352         boolean_t               zp_byteorder;
  353         uint8_t                 zp_salt[ZIO_DATA_SALT_LEN];
  354         uint8_t                 zp_iv[ZIO_DATA_IV_LEN];
  355         uint8_t                 zp_mac[ZIO_DATA_MAC_LEN];
  356         uint32_t                zp_zpl_smallblk;
  357 } zio_prop_t;
  358 
  359 typedef struct zio_cksum_report zio_cksum_report_t;
  360 
  361 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
  362     const abd_t *good_data);
  363 typedef void zio_cksum_free_f(void *cbdata, size_t size);
  364 
  365 struct zio_bad_cksum;                           /* defined in zio_checksum.h */
  366 struct dnode_phys;
  367 struct abd;
  368 
  369 struct zio_cksum_report {
  370         struct zio_cksum_report *zcr_next;
  371         nvlist_t                *zcr_ereport;
  372         nvlist_t                *zcr_detector;
  373         void                    *zcr_cbdata;
  374         size_t                  zcr_cbinfo;     /* passed to zcr_free() */
  375         uint64_t                zcr_sector;
  376         uint64_t                zcr_align;
  377         uint64_t                zcr_length;
  378         zio_cksum_finish_f      *zcr_finish;
  379         zio_cksum_free_f        *zcr_free;
  380 
  381         /* internal use only */
  382         struct zio_bad_cksum    *zcr_ckinfo;    /* information from failure */
  383 };
  384 
  385 typedef struct zio_vsd_ops {
  386         zio_done_func_t         *vsd_free;
  387 } zio_vsd_ops_t;
  388 
  389 typedef struct zio_gang_node {
  390         zio_gbh_phys_t          *gn_gbh;
  391         struct zio_gang_node    *gn_child[SPA_GBH_NBLKPTRS];
  392 } zio_gang_node_t;
  393 
  394 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
  395     zio_gang_node_t *gn, struct abd *data, uint64_t offset);
  396 
  397 typedef void zio_transform_func_t(zio_t *zio, struct abd *data, uint64_t size);
  398 
  399 typedef struct zio_transform {
  400         struct abd              *zt_orig_abd;
  401         uint64_t                zt_orig_size;
  402         uint64_t                zt_bufsize;
  403         zio_transform_func_t    *zt_transform;
  404         struct zio_transform    *zt_next;
  405 } zio_transform_t;
  406 
  407 typedef zio_t *zio_pipe_stage_t(zio_t *zio);
  408 
  409 /*
  410  * The io_reexecute flags are distinct from io_flags because the child must
  411  * be able to propagate them to the parent.  The normal io_flags are local
  412  * to the zio, not protected by any lock, and not modifiable by children;
  413  * the reexecute flags are protected by io_lock, modifiable by children,
  414  * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
  415  */
  416 #define ZIO_REEXECUTE_NOW       0x01
  417 #define ZIO_REEXECUTE_SUSPEND   0x02
  418 
  419 /*
  420  * The io_trim flags are used to specify the type of TRIM to perform.  They
  421  * only apply to ZIO_TYPE_TRIM zios are distinct from io_flags.
  422  */
  423 enum trim_flag {
  424         ZIO_TRIM_SECURE         = 1U << 0,
  425 };
  426 
  427 typedef struct zio_alloc_list {
  428         list_t  zal_list;
  429         uint64_t zal_size;
  430 } zio_alloc_list_t;
  431 
  432 typedef struct zio_link {
  433         zio_t           *zl_parent;
  434         zio_t           *zl_child;
  435         list_node_t     zl_parent_node;
  436         list_node_t     zl_child_node;
  437 } zio_link_t;
  438 
  439 struct zio {
  440         /* Core information about this I/O */
  441         zbookmark_phys_t        io_bookmark;
  442         zio_prop_t      io_prop;
  443         zio_type_t      io_type;
  444         enum zio_child  io_child_type;
  445         enum trim_flag  io_trim_flags;
  446         int             io_cmd;
  447         zio_priority_t  io_priority;
  448         uint8_t         io_reexecute;
  449         uint8_t         io_state[ZIO_WAIT_TYPES];
  450         uint64_t        io_txg;
  451         spa_t           *io_spa;
  452         blkptr_t        *io_bp;
  453         blkptr_t        *io_bp_override;
  454         blkptr_t        io_bp_copy;
  455         list_t          io_parent_list;
  456         list_t          io_child_list;
  457         zio_t           *io_logical;
  458         zio_transform_t *io_transform_stack;
  459 
  460         /* Callback info */
  461         zio_done_func_t *io_ready;
  462         zio_done_func_t *io_children_ready;
  463         zio_done_func_t *io_physdone;
  464         zio_done_func_t *io_done;
  465         void            *io_private;
  466         int64_t         io_prev_space_delta;    /* DMU private */
  467         blkptr_t        io_bp_orig;
  468         /* io_lsize != io_orig_size iff this is a raw write */
  469         uint64_t        io_lsize;
  470 
  471         /* Data represented by this I/O */
  472         struct abd      *io_abd;
  473         struct abd      *io_orig_abd;
  474         uint64_t        io_size;
  475         uint64_t        io_orig_size;
  476 
  477         /* Stuff for the vdev stack */
  478         vdev_t          *io_vd;
  479         void            *io_vsd;
  480         const zio_vsd_ops_t *io_vsd_ops;
  481         metaslab_class_t *io_metaslab_class;    /* dva throttle class */
  482 
  483         uint64_t        io_offset;
  484         hrtime_t        io_timestamp;   /* submitted at */
  485         hrtime_t        io_queued_timestamp;
  486         hrtime_t        io_target_timestamp;
  487         hrtime_t        io_delta;       /* vdev queue service delta */
  488         hrtime_t        io_delay;       /* Device access time (disk or */
  489                                         /* file). */
  490         avl_node_t      io_queue_node;
  491         avl_node_t      io_offset_node;
  492         avl_node_t      io_alloc_node;
  493         zio_alloc_list_t        io_alloc_list;
  494 
  495         /* Internal pipeline state */
  496         zio_flag_t      io_flags;
  497         enum zio_stage  io_stage;
  498         enum zio_stage  io_pipeline;
  499         zio_flag_t      io_orig_flags;
  500         enum zio_stage  io_orig_stage;
  501         enum zio_stage  io_orig_pipeline;
  502         enum zio_stage  io_pipeline_trace;
  503         int             io_error;
  504         int             io_child_error[ZIO_CHILD_TYPES];
  505         uint64_t        io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
  506         uint64_t        io_child_count;
  507         uint64_t        io_phys_children;
  508         uint64_t        io_parent_count;
  509         uint64_t        *io_stall;
  510         zio_t           *io_gang_leader;
  511         zio_gang_node_t *io_gang_tree;
  512         void            *io_executor;
  513         void            *io_waiter;
  514         void            *io_bio;
  515         kmutex_t        io_lock;
  516         kcondvar_t      io_cv;
  517         int             io_allocator;
  518 
  519         /* FMA state */
  520         zio_cksum_report_t *io_cksum_report;
  521         uint64_t        io_ena;
  522 
  523         /* Taskq dispatching state */
  524         taskq_ent_t     io_tqent;
  525 };
  526 
  527 enum blk_verify_flag {
  528         BLK_VERIFY_ONLY,
  529         BLK_VERIFY_LOG,
  530         BLK_VERIFY_HALT
  531 };
  532 
  533 extern int zio_bookmark_compare(const void *, const void *);
  534 
  535 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
  536     zio_done_func_t *done, void *priv, zio_flag_t flags);
  537 
  538 extern zio_t *zio_root(spa_t *spa,
  539     zio_done_func_t *done, void *priv, zio_flag_t flags);
  540 
  541 extern void zio_destroy(zio_t *zio);
  542 
  543 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
  544     struct abd *data, uint64_t lsize, zio_done_func_t *done, void *priv,
  545     zio_priority_t priority, zio_flag_t flags, const zbookmark_phys_t *zb);
  546 
  547 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
  548     struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp,
  549     zio_done_func_t *ready, zio_done_func_t *children_ready,
  550     zio_done_func_t *physdone, zio_done_func_t *done,
  551     void *priv, zio_priority_t priority, zio_flag_t flags,
  552     const zbookmark_phys_t *zb);
  553 
  554 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
  555     struct abd *data, uint64_t size, zio_done_func_t *done, void *priv,
  556     zio_priority_t priority, zio_flag_t flags, zbookmark_phys_t *zb);
  557 
  558 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
  559     boolean_t nopwrite);
  560 
  561 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
  562 
  563 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
  564     const blkptr_t *bp,
  565     zio_done_func_t *done, void *priv, zio_flag_t flags);
  566 
  567 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
  568     zio_done_func_t *done, void *priv, zio_flag_t flags);
  569 
  570 extern zio_t *zio_trim(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size,
  571     zio_done_func_t *done, void *priv, zio_priority_t priority,
  572     zio_flag_t flags, enum trim_flag trim_flags);
  573 
  574 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
  575     uint64_t size, struct abd *data, int checksum,
  576     zio_done_func_t *done, void *priv, zio_priority_t priority,
  577     zio_flag_t flags, boolean_t labels);
  578 
  579 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
  580     uint64_t size, struct abd *data, int checksum,
  581     zio_done_func_t *done, void *priv, zio_priority_t priority,
  582     zio_flag_t flags, boolean_t labels);
  583 
  584 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
  585     const blkptr_t *bp, zio_flag_t flags);
  586 
  587 extern int zio_alloc_zil(spa_t *spa, objset_t *os, uint64_t txg,
  588     blkptr_t *new_bp, uint64_t size, boolean_t *slog);
  589 extern void zio_flush(zio_t *zio, vdev_t *vd);
  590 extern void zio_shrink(zio_t *zio, uint64_t size);
  591 
  592 extern int zio_wait(zio_t *zio);
  593 extern void zio_nowait(zio_t *zio);
  594 extern void zio_execute(void *zio);
  595 extern void zio_interrupt(void *zio);
  596 extern void zio_delay_init(zio_t *zio);
  597 extern void zio_delay_interrupt(zio_t *zio);
  598 extern void zio_deadman(zio_t *zio, const char *tag);
  599 
  600 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **);
  601 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **);
  602 extern zio_t *zio_unique_parent(zio_t *cio);
  603 extern void zio_add_child(zio_t *pio, zio_t *cio);
  604 
  605 extern void *zio_buf_alloc(size_t size);
  606 extern void zio_buf_free(void *buf, size_t size);
  607 extern void *zio_data_buf_alloc(size_t size);
  608 extern void zio_data_buf_free(void *buf, size_t size);
  609 
  610 extern void zio_push_transform(zio_t *zio, struct abd *abd, uint64_t size,
  611     uint64_t bufsize, zio_transform_func_t *transform);
  612 extern void zio_pop_transforms(zio_t *zio);
  613 
  614 extern void zio_resubmit_stage_async(void *);
  615 
  616 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
  617     uint64_t offset, struct abd *data, uint64_t size, int type,
  618     zio_priority_t priority, zio_flag_t flags,
  619     zio_done_func_t *done, void *priv);
  620 
  621 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
  622     struct abd *data, uint64_t size, zio_type_t type, zio_priority_t priority,
  623     zio_flag_t flags, zio_done_func_t *done, void *priv);
  624 
  625 extern void zio_vdev_io_bypass(zio_t *zio);
  626 extern void zio_vdev_io_reissue(zio_t *zio);
  627 extern void zio_vdev_io_redone(zio_t *zio);
  628 
  629 extern void zio_change_priority(zio_t *pio, zio_priority_t priority);
  630 
  631 extern void zio_checksum_verified(zio_t *zio);
  632 extern int zio_worst_error(int e1, int e2);
  633 
  634 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
  635     enum zio_checksum parent);
  636 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
  637     enum zio_checksum child, enum zio_checksum parent);
  638 extern enum zio_compress zio_compress_select(spa_t *spa,
  639     enum zio_compress child, enum zio_compress parent);
  640 extern uint8_t zio_complevel_select(spa_t *spa, enum zio_compress compress,
  641     uint8_t child, uint8_t parent);
  642 
  643 extern void zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t);
  644 extern int zio_resume(spa_t *spa);
  645 extern void zio_resume_wait(spa_t *spa);
  646 
  647 extern boolean_t zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp,
  648     boolean_t config_held, enum blk_verify_flag blk_verify);
  649 
  650 /*
  651  * Initial setup and teardown.
  652  */
  653 extern void zio_init(void);
  654 extern void zio_fini(void);
  655 
  656 /*
  657  * Fault injection
  658  */
  659 struct zinject_record;
  660 extern uint32_t zio_injection_enabled;
  661 extern int zio_inject_fault(char *name, int flags, int *id,
  662     struct zinject_record *record);
  663 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
  664     struct zinject_record *record);
  665 extern int zio_clear_fault(int id);
  666 extern void zio_handle_panic_injection(spa_t *spa, const char *tag,
  667     uint64_t type);
  668 extern int zio_handle_decrypt_injection(spa_t *spa, const zbookmark_phys_t *zb,
  669     uint64_t type, int error);
  670 extern int zio_handle_fault_injection(zio_t *zio, int error);
  671 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
  672 extern int zio_handle_device_injections(vdev_t *vd, zio_t *zio, int err1,
  673     int err2);
  674 extern int zio_handle_label_injection(zio_t *zio, int error);
  675 extern void zio_handle_ignored_writes(zio_t *zio);
  676 extern hrtime_t zio_handle_io_delay(zio_t *zio);
  677 
  678 /*
  679  * Checksum ereport functions
  680  */
  681 extern int zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd,
  682     const zbookmark_phys_t *zb, struct zio *zio, uint64_t offset,
  683     uint64_t length, struct zio_bad_cksum *info);
  684 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
  685     const abd_t *good_data, const abd_t *bad_data, boolean_t drop_if_identical);
  686 
  687 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
  688 
  689 /* If we have the good data in hand, this function can be used */
  690 extern int zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
  691     const zbookmark_phys_t *zb, struct zio *zio, uint64_t offset,
  692     uint64_t length, const abd_t *good_data, const abd_t *bad_data,
  693     struct zio_bad_cksum *info);
  694 
  695 void zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr);
  696 extern void zfs_ereport_snapshot_post(const char *subclass, spa_t *spa,
  697     const char *name);
  698 
  699 /* Called from spa_sync(), but primarily an injection handler */
  700 extern void spa_handle_ignored_writes(spa_t *spa);
  701 
  702 /* zbookmark_phys functions */
  703 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp,
  704     const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
  705 boolean_t zbookmark_subtree_tbd(const struct dnode_phys *dnp,
  706     const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
  707 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2,
  708     uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);
  709 
  710 #ifdef  __cplusplus
  711 }
  712 #endif
  713 
  714 #endif  /* _ZIO_H */

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