include/sys/zio.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  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, 2017 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  */
  30
  31 #ifndef _ZIO_H
  32 #define _ZIO_H
  33
  34 #include <sys/zio_priority.h>
  35 #include <sys/zfs_context.h>
  36 #include <sys/spa.h>
  37 #include <sys/txg.h>
  38 #include <sys/avl.h>
  39 #include <sys/fs/zfs.h>
  40 #include <sys/zio_impl.h>
  41
  42 #ifdef  __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 /*
  47  * Embedded checksum
  48  */
  49 #define ZEC_MAGIC       0x210da7ab10c7a11ULL
  50
  51 typedef struct zio_eck {
  52         uint64_t        zec_magic;      /* for validation, endianness   */
  53         zio_cksum_t     zec_cksum;      /* 256-bit checksum             */
  54 } zio_eck_t;
  55
  56 /*
  57  * Gang block headers are self-checksumming and contain an array
  58  * of block pointers.
  59  */
  60 #define SPA_GANGBLOCKSIZE       SPA_MINBLOCKSIZE
  61 #define SPA_GBH_NBLKPTRS        ((SPA_GANGBLOCKSIZE - \
  62         sizeof (zio_eck_t)) / sizeof (blkptr_t))
  63 #define SPA_GBH_FILLER          ((SPA_GANGBLOCKSIZE - \
  64         sizeof (zio_eck_t) - \
  65         (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
  66         sizeof (uint64_t))
  67
  68 typedef struct zio_gbh {
  69         blkptr_t                zg_blkptr[SPA_GBH_NBLKPTRS];
  70         uint64_t                zg_filler[SPA_GBH_FILLER];
  71         zio_eck_t               zg_tail;
  72 } zio_gbh_phys_t;
  73
  74 enum zio_checksum {
  75         ZIO_CHECKSUM_INHERIT = 0,
  76         ZIO_CHECKSUM_ON,
  77         ZIO_CHECKSUM_OFF,
  78         ZIO_CHECKSUM_LABEL,
  79         ZIO_CHECKSUM_GANG_HEADER,
  80         ZIO_CHECKSUM_ZILOG,
  81         ZIO_CHECKSUM_FLETCHER_2,
  82         ZIO_CHECKSUM_FLETCHER_4,
  83         ZIO_CHECKSUM_SHA256,
  84         ZIO_CHECKSUM_ZILOG2,
  85         ZIO_CHECKSUM_NOPARITY,
  86         ZIO_CHECKSUM_SHA512,
  87         ZIO_CHECKSUM_SKEIN,
  88         ZIO_CHECKSUM_EDONR,
  89         ZIO_CHECKSUM_FUNCTIONS
  90 };
  91
  92 /*
  93  * The number of "legacy" compression functions which can be set on individual
  94  * objects.
  95  */
  96 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2
  97
  98 #define ZIO_CHECKSUM_ON_VALUE   ZIO_CHECKSUM_FLETCHER_4
  99 #define ZIO_CHECKSUM_DEFAULT    ZIO_CHECKSUM_ON
 100
 101 #define ZIO_CHECKSUM_MASK       0xffULL
 102 #define ZIO_CHECKSUM_VERIFY     (1 << 8)
 103
 104 #define ZIO_DEDUPCHECKSUM       ZIO_CHECKSUM_SHA256
 105 #define ZIO_DEDUPDITTO_MIN      100
 106
 107 /*
 108  * The number of "legacy" compression functions which can be set on individual
 109  * objects.
 110  */
 111 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
 112
 113 /*
 114  * The meaning of "compress = on" selected by the compression features enabled
 115  * on a given pool.
 116  */
 117 #define ZIO_COMPRESS_LEGACY_ON_VALUE    ZIO_COMPRESS_LZJB
 118 #define ZIO_COMPRESS_LZ4_ON_VALUE       ZIO_COMPRESS_LZ4
 119
 120 #define ZIO_COMPRESS_DEFAULT            ZIO_COMPRESS_OFF
 121
 122 #define BOOTFS_COMPRESS_VALID(compress)                 \
 123         ((compress) == ZIO_COMPRESS_LZJB ||             \
 124         (compress) == ZIO_COMPRESS_LZ4 ||               \
 125         (compress) == ZIO_COMPRESS_GZIP_1 ||            \
 126         (compress) == ZIO_COMPRESS_GZIP_2 ||            \
 127         (compress) == ZIO_COMPRESS_GZIP_3 ||            \
 128         (compress) == ZIO_COMPRESS_GZIP_4 ||            \
 129         (compress) == ZIO_COMPRESS_GZIP_5 ||            \
 130         (compress) == ZIO_COMPRESS_GZIP_6 ||            \
 131         (compress) == ZIO_COMPRESS_GZIP_7 ||            \
 132         (compress) == ZIO_COMPRESS_GZIP_8 ||            \
 133         (compress) == ZIO_COMPRESS_GZIP_9 ||            \
 134         (compress) == ZIO_COMPRESS_ZLE ||               \
 135         (compress) == ZIO_COMPRESS_ON ||                \
 136         (compress) == ZIO_COMPRESS_OFF)
 137
 138 /*
 139  * Default Linux timeout for a sd device.
 140  */
 141 #define ZIO_DELAY_MAX                   (30 * MILLISEC)
 142
 143 #define ZIO_FAILURE_MODE_WAIT           0
 144 #define ZIO_FAILURE_MODE_CONTINUE       1
 145 #define ZIO_FAILURE_MODE_PANIC          2
 146
 147 enum zio_flag {
 148         /*
 149          * Flags inherited by gang, ddt, and vdev children,
 150          * and that must be equal for two zios to aggregate
 151          */
 152         ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
 153         ZIO_FLAG_IO_REPAIR      = 1 << 1,
 154         ZIO_FLAG_SELF_HEAL      = 1 << 2,
 155         ZIO_FLAG_RESILVER       = 1 << 3,
 156         ZIO_FLAG_SCRUB          = 1 << 4,
 157         ZIO_FLAG_SCAN_THREAD    = 1 << 5,
 158         ZIO_FLAG_PHYSICAL       = 1 << 6,
 159
 160 #define ZIO_FLAG_AGG_INHERIT    (ZIO_FLAG_CANFAIL - 1)
 161
 162         /*
 163          * Flags inherited by ddt, gang, and vdev children.
 164          */
 165         ZIO_FLAG_CANFAIL        = 1 << 7,       /* must be first for INHERIT */
 166         ZIO_FLAG_SPECULATIVE    = 1 << 8,
 167         ZIO_FLAG_CONFIG_WRITER  = 1 << 9,
 168         ZIO_FLAG_DONT_RETRY     = 1 << 10,
 169         ZIO_FLAG_DONT_CACHE     = 1 << 11,
 170         ZIO_FLAG_NODATA         = 1 << 12,
 171         ZIO_FLAG_INDUCE_DAMAGE  = 1 << 13,
 172         ZIO_FLAG_IO_ALLOCATING  = 1 << 14,
 173
 174 #define ZIO_FLAG_DDT_INHERIT    (ZIO_FLAG_IO_RETRY - 1)
 175 #define ZIO_FLAG_GANG_INHERIT   (ZIO_FLAG_IO_RETRY - 1)
 176
 177         /*
 178          * Flags inherited by vdev children.
 179          */
 180         ZIO_FLAG_IO_RETRY       = 1 << 15,      /* must be first for INHERIT */
 181         ZIO_FLAG_PROBE          = 1 << 16,
 182         ZIO_FLAG_TRYHARD        = 1 << 17,
 183         ZIO_FLAG_OPTIONAL       = 1 << 18,
 184
 185 #define ZIO_FLAG_VDEV_INHERIT   (ZIO_FLAG_DONT_QUEUE - 1)
 186
 187         /*
 188          * Flags not inherited by any children.
 189          */
 190         ZIO_FLAG_DONT_QUEUE     = 1 << 19,      /* must be first for INHERIT */
 191         ZIO_FLAG_DONT_PROPAGATE = 1 << 20,
 192         ZIO_FLAG_IO_BYPASS      = 1 << 21,
 193         ZIO_FLAG_IO_REWRITE     = 1 << 22,
 194         ZIO_FLAG_RAW            = 1 << 23,
 195         ZIO_FLAG_GANG_CHILD     = 1 << 24,
 196         ZIO_FLAG_DDT_CHILD      = 1 << 25,
 197         ZIO_FLAG_GODFATHER      = 1 << 26,
 198         ZIO_FLAG_NOPWRITE       = 1 << 27,
 199         ZIO_FLAG_REEXECUTED     = 1 << 28,
 200         ZIO_FLAG_DELEGATED      = 1 << 29,
 201         ZIO_FLAG_FASTWRITE      = 1 << 30
 202 };
 203
 204 #define ZIO_FLAG_MUSTSUCCEED            0
 205
 206 #define ZIO_DDT_CHILD_FLAGS(zio)                                \
 207         (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) |             \
 208         ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
 209
 210 #define ZIO_GANG_CHILD_FLAGS(zio)                               \
 211         (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) |            \
 212         ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
 213
 214 #define ZIO_VDEV_CHILD_FLAGS(zio)                               \
 215         (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) |            \
 216         ZIO_FLAG_CANFAIL)
 217
 218 enum zio_child {
 219         ZIO_CHILD_VDEV = 0,
 220         ZIO_CHILD_GANG,
 221         ZIO_CHILD_DDT,
 222         ZIO_CHILD_LOGICAL,
 223         ZIO_CHILD_TYPES
 224 };
 225
 226 enum zio_wait_type {
 227         ZIO_WAIT_READY = 0,
 228         ZIO_WAIT_DONE,
 229         ZIO_WAIT_TYPES
 230 };
 231
 232 /*
 233  * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
 234  * graveyard) to indicate checksum errors and fragmentation.
 235  */
 236 #define ECKSUM  EBADE
 237 #define EFRAGS  EBADR
 238
 239 typedef void zio_done_func_t(zio_t *zio);
 240
 241 extern int zio_dva_throttle_enabled;
 242 extern const char *zio_type_name[ZIO_TYPES];
 243
 244 /*
 245  * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
 246  * identifies any block in the pool.  By convention, the meta-objset (MOS)
 247  * is objset 0, and the meta-dnode is object 0.  This covers all blocks
 248  * except root blocks and ZIL blocks, which are defined as follows:
 249  *
 250  * Root blocks (objset_phys_t) are object 0, level -1:  <objset, 0, -1, 0>.
 251  * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
 252  * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
 253  * dnode visit bookmarks are <objset, object id of dnode, -3, 0>.
 254  *
 255  * Note: this structure is called a bookmark because its original purpose
 256  * was to remember where to resume a pool-wide traverse.
 257  *
 258  * Note: this structure is passed between userland and the kernel, and is
 259  * stored on disk (by virtue of being incorporated into other on-disk
 260  * structures, e.g. dsl_scan_phys_t).
 261  */
 262 struct zbookmark_phys {
 263         uint64_t        zb_objset;
 264         uint64_t        zb_object;
 265         int64_t         zb_level;
 266         uint64_t        zb_blkid;
 267 };
 268
 269 #define SET_BOOKMARK(zb, objset, object, level, blkid)  \
 270 {                                                       \
 271         (zb)->zb_objset = objset;                       \
 272         (zb)->zb_object = object;                       \
 273         (zb)->zb_level = level;                         \
 274         (zb)->zb_blkid = blkid;                         \
 275 }
 276
 277 #define ZB_DESTROYED_OBJSET     (-1ULL)
 278
 279 #define ZB_ROOT_OBJECT          (0ULL)
 280 #define ZB_ROOT_LEVEL           (-1LL)
 281 #define ZB_ROOT_BLKID           (0ULL)
 282
 283 #define ZB_ZIL_OBJECT           (0ULL)
 284 #define ZB_ZIL_LEVEL            (-2LL)
 285
 286 #define ZB_DNODE_LEVEL          (-3LL)
 287 #define ZB_DNODE_BLKID          (0ULL)
 288
 289 #define ZB_IS_ZERO(zb)                                          \
 290         ((zb)->zb_objset == 0 && (zb)->zb_object == 0 &&        \
 291         (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
 292 #define ZB_IS_ROOT(zb)                          \
 293         ((zb)->zb_object == ZB_ROOT_OBJECT &&   \
 294         (zb)->zb_level == ZB_ROOT_LEVEL &&      \
 295         (zb)->zb_blkid == ZB_ROOT_BLKID)
 296
 297 typedef struct zio_prop {
 298         enum zio_checksum       zp_checksum;
 299         enum zio_compress       zp_compress;
 300         dmu_object_type_t       zp_type;
 301         uint8_t                 zp_level;
 302         uint8_t                 zp_copies;
 303         boolean_t               zp_dedup;
 304         boolean_t               zp_dedup_verify;
 305         boolean_t               zp_nopwrite;
 306 } zio_prop_t;
 307
 308 typedef struct zio_cksum_report zio_cksum_report_t;
 309
 310 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
 311     const abd_t *good_data);
 312 typedef void zio_cksum_free_f(void *cbdata, size_t size);
 313
 314 struct zio_bad_cksum;                           /* defined in zio_checksum.h */
 315 struct dnode_phys;
 316 struct abd;
 317
 318 struct zio_cksum_report {
 319         struct zio_cksum_report *zcr_next;
 320         nvlist_t                *zcr_ereport;
 321         nvlist_t                *zcr_detector;
 322         void                    *zcr_cbdata;
 323         size_t                  zcr_cbinfo;     /* passed to zcr_free() */
 324         uint64_t                zcr_align;
 325         uint64_t                zcr_length;
 326         zio_cksum_finish_f      *zcr_finish;
 327         zio_cksum_free_f        *zcr_free;
 328
 329         /* internal use only */
 330         struct zio_bad_cksum    *zcr_ckinfo;    /* information from failure */
 331 };
 332
 333 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
 334     void *arg);
 335
 336 zio_vsd_cksum_report_f  zio_vsd_default_cksum_report;
 337
 338 typedef struct zio_vsd_ops {
 339         zio_done_func_t         *vsd_free;
 340         zio_vsd_cksum_report_f  *vsd_cksum_report;
 341 } zio_vsd_ops_t;
 342
 343 typedef struct zio_gang_node {
 344         zio_gbh_phys_t          *gn_gbh;
 345         struct zio_gang_node    *gn_child[SPA_GBH_NBLKPTRS];
 346 } zio_gang_node_t;
 347
 348 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
 349     zio_gang_node_t *gn, struct abd *data, uint64_t offset);
 350
 351 typedef void zio_transform_func_t(zio_t *zio, struct abd *data, uint64_t size);
 352
 353 typedef struct zio_transform {
 354         struct abd              *zt_orig_abd;
 355         uint64_t                zt_orig_size;
 356         uint64_t                zt_bufsize;
 357         zio_transform_func_t    *zt_transform;
 358         struct zio_transform    *zt_next;
 359 } zio_transform_t;
 360
 361 typedef int zio_pipe_stage_t(zio_t *zio);
 362
 363 /*
 364  * The io_reexecute flags are distinct from io_flags because the child must
 365  * be able to propagate them to the parent.  The normal io_flags are local
 366  * to the zio, not protected by any lock, and not modifiable by children;
 367  * the reexecute flags are protected by io_lock, modifiable by children,
 368  * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
 369  */
 370 #define ZIO_REEXECUTE_NOW       0x01
 371 #define ZIO_REEXECUTE_SUSPEND   0x02
 372
 373 typedef struct zio_alloc_list {
 374         list_t  zal_list;
 375         uint64_t zal_size;
 376 } zio_alloc_list_t;
 377
 378 typedef struct zio_link {
 379         zio_t           *zl_parent;
 380         zio_t           *zl_child;
 381         list_node_t     zl_parent_node;
 382         list_node_t     zl_child_node;
 383 } zio_link_t;
 384
 385 struct zio {
 386         /* Core information about this I/O */
 387         zbookmark_phys_t        io_bookmark;
 388         zio_prop_t      io_prop;
 389         zio_type_t      io_type;
 390         enum zio_child  io_child_type;
 391         int             io_cmd;
 392         zio_priority_t  io_priority;
 393         uint8_t         io_reexecute;
 394         uint8_t         io_state[ZIO_WAIT_TYPES];
 395         uint64_t        io_txg;
 396         spa_t           *io_spa;
 397         blkptr_t        *io_bp;
 398         blkptr_t        *io_bp_override;
 399         blkptr_t        io_bp_copy;
 400         list_t          io_parent_list;
 401         list_t          io_child_list;
 402         zio_t           *io_logical;
 403         zio_transform_t *io_transform_stack;
 404
 405         /* Callback info */
 406         zio_done_func_t *io_ready;
 407         zio_done_func_t *io_children_ready;
 408         zio_done_func_t *io_physdone;
 409         zio_done_func_t *io_done;
 410         void            *io_private;
 411         int64_t         io_prev_space_delta;    /* DMU private */
 412         blkptr_t        io_bp_orig;
 413         /* io_lsize != io_orig_size iff this is a raw write */
 414         uint64_t        io_lsize;
 415
 416         /* Data represented by this I/O */
 417         struct abd      *io_abd;
 418         struct abd      *io_orig_abd;
 419         uint64_t        io_size;
 420         uint64_t        io_orig_size;
 421
 422         /* Stuff for the vdev stack */
 423         vdev_t          *io_vd;
 424         void            *io_vsd;
 425         const zio_vsd_ops_t *io_vsd_ops;
 426
 427         uint64_t        io_offset;
 428         hrtime_t        io_timestamp;   /* submitted at */
 429         hrtime_t        io_queued_timestamp;
 430         hrtime_t        io_target_timestamp;
 431         hrtime_t        io_delta;       /* vdev queue service delta */
 432         hrtime_t        io_delay;       /* Device access time (disk or */
 433                                         /* file). */
 434         avl_node_t      io_queue_node;
 435         avl_node_t      io_offset_node;
 436         avl_node_t      io_alloc_node;
 437         zio_alloc_list_t        io_alloc_list;
 438
 439         /* Internal pipeline state */
 440         enum zio_flag   io_flags;
 441         enum zio_stage  io_stage;
 442         enum zio_stage  io_pipeline;
 443         enum zio_flag   io_orig_flags;
 444         enum zio_stage  io_orig_stage;
 445         enum zio_stage  io_orig_pipeline;
 446         enum zio_stage  io_pipeline_trace;
 447         int             io_error;
 448         int             io_child_error[ZIO_CHILD_TYPES];
 449         uint64_t        io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
 450         uint64_t        io_child_count;
 451         uint64_t        io_phys_children;
 452         uint64_t        io_parent_count;
 453         uint64_t        *io_stall;
 454         zio_t           *io_gang_leader;
 455         zio_gang_node_t *io_gang_tree;
 456         void            *io_executor;
 457         void            *io_waiter;
 458         kmutex_t        io_lock;
 459         kcondvar_t      io_cv;
 460
 461         /* FMA state */
 462         zio_cksum_report_t *io_cksum_report;
 463         uint64_t        io_ena;
 464
 465         /* Taskq dispatching state */
 466         taskq_ent_t     io_tqent;
 467 };
 468
 469 extern int zio_bookmark_compare(const void *, const void *);
 470
 471 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
 472     zio_done_func_t *done, void *private, enum zio_flag flags);
 473
 474 extern zio_t *zio_root(spa_t *spa,
 475     zio_done_func_t *done, void *private, enum zio_flag flags);
 476
 477 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
 478     struct abd *data, uint64_t lsize, zio_done_func_t *done, void *private,
 479     zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
 480
 481 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
 482     struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp,
 483     zio_done_func_t *ready, zio_done_func_t *children_ready,
 484     zio_done_func_t *physdone, zio_done_func_t *done,
 485     void *private, zio_priority_t priority, enum zio_flag flags,
 486     const zbookmark_phys_t *zb);
 487
 488 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
 489     struct abd *data, uint64_t size, zio_done_func_t *done, void *private,
 490     zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb);
 491
 492 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
 493     boolean_t nopwrite);
 494
 495 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
 496
 497 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
 498     const blkptr_t *bp,
 499     zio_done_func_t *done, void *private, enum zio_flag flags);
 500
 501 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
 502     zio_done_func_t *done, void *private, enum zio_flag flags);
 503
 504 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
 505     uint64_t size, struct abd *data, int checksum,
 506     zio_done_func_t *done, void *private, zio_priority_t priority,
 507     enum zio_flag flags, boolean_t labels);
 508
 509 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
 510     uint64_t size, struct abd *data, int checksum,
 511     zio_done_func_t *done, void *private, zio_priority_t priority,
 512     enum zio_flag flags, boolean_t labels);
 513
 514 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
 515     const blkptr_t *bp, enum zio_flag flags);
 516
 517 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
 518     uint64_t size, boolean_t *slog);
 519 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
 520 extern void zio_flush(zio_t *zio, vdev_t *vd);
 521 extern void zio_shrink(zio_t *zio, uint64_t size);
 522
 523 extern int zio_wait(zio_t *zio);
 524 extern void zio_nowait(zio_t *zio);
 525 extern void zio_execute(zio_t *zio);
 526 extern void zio_interrupt(zio_t *zio);
 527 extern void zio_delay_init(zio_t *zio);
 528 extern void zio_delay_interrupt(zio_t *zio);
 529
 530 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **);
 531 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **);
 532 extern zio_t *zio_unique_parent(zio_t *cio);
 533 extern void zio_add_child(zio_t *pio, zio_t *cio);
 534
 535 extern void *zio_buf_alloc(size_t size);
 536 extern void zio_buf_free(void *buf, size_t size);
 537 extern void *zio_data_buf_alloc(size_t size);
 538 extern void zio_data_buf_free(void *buf, size_t size);
 539
 540 extern void zio_push_transform(zio_t *zio, struct abd *abd, uint64_t size,
 541     uint64_t bufsize, zio_transform_func_t *transform);
 542 extern void zio_pop_transforms(zio_t *zio);
 543
 544 extern void zio_resubmit_stage_async(void *);
 545
 546 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
 547     uint64_t offset, struct abd *data, uint64_t size, int type,
 548     zio_priority_t priority, enum zio_flag flags,
 549     zio_done_func_t *done, void *private);
 550
 551 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
 552     struct abd *data, uint64_t size, int type, zio_priority_t priority,
 553     enum zio_flag flags, zio_done_func_t *done, void *private);
 554
 555 extern void zio_vdev_io_bypass(zio_t *zio);
 556 extern void zio_vdev_io_reissue(zio_t *zio);
 557 extern void zio_vdev_io_redone(zio_t *zio);
 558
 559 extern void zio_checksum_verified(zio_t *zio);
 560 extern int zio_worst_error(int e1, int e2);
 561
 562 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
 563     enum zio_checksum parent);
 564 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
 565     enum zio_checksum child, enum zio_checksum parent);
 566 extern enum zio_compress zio_compress_select(spa_t *spa,
 567     enum zio_compress child, enum zio_compress parent);
 568
 569 extern void zio_suspend(spa_t *spa, zio_t *zio);
 570 extern int zio_resume(spa_t *spa);
 571 extern void zio_resume_wait(spa_t *spa);
 572
 573 /*
 574  * Initial setup and teardown.
 575  */
 576 extern void zio_init(void);
 577 extern void zio_fini(void);
 578
 579 /*
 580  * Fault injection
 581  */
 582 struct zinject_record;
 583 extern uint32_t zio_injection_enabled;
 584 extern int zio_inject_fault(char *name, int flags, int *id,
 585     struct zinject_record *record);
 586 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
 587     struct zinject_record *record);
 588 extern int zio_clear_fault(int id);
 589 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
 590 extern int zio_handle_fault_injection(zio_t *zio, int error);
 591 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
 592 extern int zio_handle_label_injection(zio_t *zio, int error);
 593 extern void zio_handle_ignored_writes(zio_t *zio);
 594 extern hrtime_t zio_handle_io_delay(zio_t *zio);
 595
 596 /*
 597  * Checksum ereport functions
 598  */
 599 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
 600     uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
 601 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
 602     const abd_t *good_data, const abd_t *bad_data, boolean_t drop_if_identical);
 603
 604 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
 605
 606 /* If we have the good data in hand, this function can be used */
 607 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
 608     struct zio *zio, uint64_t offset, uint64_t length,
 609     const abd_t *good_data, const abd_t *bad_data, struct zio_bad_cksum *info);
 610
 611 /* Called from spa_sync(), but primarily an injection handler */
 612 extern void spa_handle_ignored_writes(spa_t *spa);
 613
 614 /* zbookmark_phys functions */
 615 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp,
 616     const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
 617 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2,
 618     uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);
 619
 620 #ifdef  __cplusplus
 621 }
 622 #endif
 623
 624 #endif  /* _ZIO_H */