usr/src/uts/common/fs/zfs/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_ON ||                \
 135         (compress) == ZIO_COMPRESS_OFF)
 136
 137 #define ZIO_FAILURE_MODE_WAIT           0
 138 #define ZIO_FAILURE_MODE_CONTINUE       1
 139 #define ZIO_FAILURE_MODE_PANIC          2
 140
 141 enum zio_flag {
 142         /*
 143          * Flags inherited by gang, ddt, and vdev children,
 144          * and that must be equal for two zios to aggregate
 145          */
 146         ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
 147         ZIO_FLAG_IO_REPAIR      = 1 << 1,
 148         ZIO_FLAG_SELF_HEAL      = 1 << 2,
 149         ZIO_FLAG_RESILVER       = 1 << 3,
 150         ZIO_FLAG_SCRUB          = 1 << 4,
 151         ZIO_FLAG_SCAN_THREAD    = 1 << 5,
 152         ZIO_FLAG_PHYSICAL       = 1 << 6,
 153
 154 #define ZIO_FLAG_AGG_INHERIT    (ZIO_FLAG_CANFAIL - 1)
 155
 156         /*
 157          * Flags inherited by ddt, gang, and vdev children.
 158          */
 159         ZIO_FLAG_CANFAIL        = 1 << 7,       /* must be first for INHERIT */
 160         ZIO_FLAG_SPECULATIVE    = 1 << 8,
 161         ZIO_FLAG_CONFIG_WRITER  = 1 << 9,
 162         ZIO_FLAG_DONT_RETRY     = 1 << 10,
 163         ZIO_FLAG_DONT_CACHE     = 1 << 11,
 164         ZIO_FLAG_NODATA         = 1 << 12,
 165         ZIO_FLAG_INDUCE_DAMAGE  = 1 << 13,
 166         ZIO_FLAG_IO_ALLOCATING  = 1 << 14,
 167
 168 #define ZIO_FLAG_DDT_INHERIT    (ZIO_FLAG_IO_RETRY - 1)
 169 #define ZIO_FLAG_GANG_INHERIT   (ZIO_FLAG_IO_RETRY - 1)
 170
 171         /*
 172          * Flags inherited by vdev children.
 173          */
 174         ZIO_FLAG_IO_RETRY       = 1 << 15,      /* must be first for INHERIT */
 175         ZIO_FLAG_PROBE          = 1 << 16,
 176         ZIO_FLAG_TRYHARD        = 1 << 17,
 177         ZIO_FLAG_OPTIONAL       = 1 << 18,
 178
 179 #define ZIO_FLAG_VDEV_INHERIT   (ZIO_FLAG_DONT_QUEUE - 1)
 180
 181         /*
 182          * Flags not inherited by any children.
 183          */
 184         ZIO_FLAG_DONT_QUEUE     = 1 << 19,      /* must be first for INHERIT */
 185         ZIO_FLAG_DONT_PROPAGATE = 1 << 20,
 186         ZIO_FLAG_IO_BYPASS      = 1 << 21,
 187         ZIO_FLAG_IO_REWRITE     = 1 << 22,
 188         ZIO_FLAG_RAW            = 1 << 23,
 189         ZIO_FLAG_GANG_CHILD     = 1 << 24,
 190         ZIO_FLAG_DDT_CHILD      = 1 << 25,
 191         ZIO_FLAG_GODFATHER      = 1 << 26,
 192         ZIO_FLAG_NOPWRITE       = 1 << 27,
 193         ZIO_FLAG_REEXECUTED     = 1 << 28,
 194         ZIO_FLAG_DELEGATED      = 1 << 29,
 195 };
 196
 197 #define ZIO_FLAG_MUSTSUCCEED            0
 198
 199 #define ZIO_DDT_CHILD_FLAGS(zio)                                \
 200         (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) |             \
 201         ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
 202
 203 #define ZIO_GANG_CHILD_FLAGS(zio)                               \
 204         (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) |            \
 205         ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
 206
 207 #define ZIO_VDEV_CHILD_FLAGS(zio)                               \
 208         (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) |            \
 209         ZIO_FLAG_CANFAIL)
 210
 211 enum zio_child {
 212         ZIO_CHILD_VDEV = 0,
 213         ZIO_CHILD_GANG,
 214         ZIO_CHILD_DDT,
 215         ZIO_CHILD_LOGICAL,
 216         ZIO_CHILD_TYPES
 217 };
 218
 219 enum zio_wait_type {
 220         ZIO_WAIT_READY = 0,
 221         ZIO_WAIT_DONE,
 222         ZIO_WAIT_TYPES
 223 };
 224
 225 /*
 226  * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
 227  * graveyard) to indicate checksum errors and fragmentation.
 228  */
 229 #define ECKSUM  EBADE
 230 #define EFRAGS  EBADR
 231
 232 typedef void zio_done_func_t(zio_t *zio);
 233
 234 extern boolean_t zio_dva_throttle_enabled;
 235 extern const char *zio_type_name[ZIO_TYPES];
 236
 237 /*
 238  * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
 239  * identifies any block in the pool.  By convention, the meta-objset (MOS)
 240  * is objset 0, and the meta-dnode is object 0.  This covers all blocks
 241  * except root blocks and ZIL blocks, which are defined as follows:
 242  *
 243  * Root blocks (objset_phys_t) are object 0, level -1:  <objset, 0, -1, 0>.
 244  * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
 245  * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
 246  * dnode visit bookmarks are <objset, object id of dnode, -3, 0>.
 247  *
 248  * Note: this structure is called a bookmark because its original purpose
 249  * was to remember where to resume a pool-wide traverse.
 250  *
 251  * Note: this structure is passed between userland and the kernel, and is
 252  * stored on disk (by virtue of being incorporated into other on-disk
 253  * structures, e.g. dsl_scan_phys_t).
 254  */
 255 typedef struct zbookmark_phys {
 256         uint64_t        zb_objset;
 257         uint64_t        zb_object;
 258         int64_t         zb_level;
 259         uint64_t        zb_blkid;
 260 } zbookmark_phys_t;
 261
 262 #define SET_BOOKMARK(zb, objset, object, level, blkid)  \
 263 {                                                       \
 264         (zb)->zb_objset = objset;                       \
 265         (zb)->zb_object = object;                       \
 266         (zb)->zb_level = level;                         \
 267         (zb)->zb_blkid = blkid;                         \
 268 }
 269
 270 #define ZB_DESTROYED_OBJSET     (-1ULL)
 271
 272 #define ZB_ROOT_OBJECT          (0ULL)
 273 #define ZB_ROOT_LEVEL           (-1LL)
 274 #define ZB_ROOT_BLKID           (0ULL)
 275
 276 #define ZB_ZIL_OBJECT           (0ULL)
 277 #define ZB_ZIL_LEVEL            (-2LL)
 278
 279 #define ZB_DNODE_LEVEL          (-3LL)
 280 #define ZB_DNODE_BLKID          (0ULL)
 281
 282 #define ZB_IS_ZERO(zb)                                          \
 283         ((zb)->zb_objset == 0 && (zb)->zb_object == 0 &&        \
 284         (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
 285 #define ZB_IS_ROOT(zb)                          \
 286         ((zb)->zb_object == ZB_ROOT_OBJECT &&   \
 287         (zb)->zb_level == ZB_ROOT_LEVEL &&      \
 288         (zb)->zb_blkid == ZB_ROOT_BLKID)
 289
 290 typedef struct zio_prop {
 291         enum zio_checksum       zp_checksum;
 292         enum zio_compress       zp_compress;
 293         dmu_object_type_t       zp_type;
 294         uint8_t                 zp_level;
 295         uint8_t                 zp_copies;
 296         boolean_t               zp_dedup;
 297         boolean_t               zp_dedup_verify;
 298         boolean_t               zp_nopwrite;
 299 } zio_prop_t;
 300
 301 typedef struct zio_cksum_report zio_cksum_report_t;
 302
 303 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
 304     const void *good_data);
 305 typedef void zio_cksum_free_f(void *cbdata, size_t size);
 306
 307 struct zio_bad_cksum;                           /* defined in zio_checksum.h */
 308 struct dnode_phys;
 309 struct abd;
 310
 311 struct zio_cksum_report {
 312         struct zio_cksum_report *zcr_next;
 313         nvlist_t                *zcr_ereport;
 314         nvlist_t                *zcr_detector;
 315         void                    *zcr_cbdata;
 316         size_t                  zcr_cbinfo;     /* passed to zcr_free() */
 317         uint64_t                zcr_align;
 318         uint64_t                zcr_length;
 319         zio_cksum_finish_f      *zcr_finish;
 320         zio_cksum_free_f        *zcr_free;
 321
 322         /* internal use only */
 323         struct zio_bad_cksum    *zcr_ckinfo;    /* information from failure */
 324 };
 325
 326 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
 327     void *arg);
 328
 329 zio_vsd_cksum_report_f  zio_vsd_default_cksum_report;
 330
 331 typedef struct zio_vsd_ops {
 332         zio_done_func_t         *vsd_free;
 333         zio_vsd_cksum_report_f  *vsd_cksum_report;
 334 } zio_vsd_ops_t;
 335
 336 typedef struct zio_gang_node {
 337         zio_gbh_phys_t          *gn_gbh;
 338         struct zio_gang_node    *gn_child[SPA_GBH_NBLKPTRS];
 339 } zio_gang_node_t;
 340
 341 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
 342     zio_gang_node_t *gn, struct abd *data, uint64_t offset);
 343
 344 typedef void zio_transform_func_t(zio_t *zio, struct abd *data, uint64_t size);
 345
 346 typedef struct zio_transform {
 347         struct abd              *zt_orig_abd;
 348         uint64_t                zt_orig_size;
 349         uint64_t                zt_bufsize;
 350         zio_transform_func_t    *zt_transform;
 351         struct zio_transform    *zt_next;
 352 } zio_transform_t;
 353
 354 typedef int zio_pipe_stage_t(zio_t *zio);
 355
 356 /*
 357  * The io_reexecute flags are distinct from io_flags because the child must
 358  * be able to propagate them to the parent.  The normal io_flags are local
 359  * to the zio, not protected by any lock, and not modifiable by children;
 360  * the reexecute flags are protected by io_lock, modifiable by children,
 361  * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
 362  */
 363 #define ZIO_REEXECUTE_NOW       0x01
 364 #define ZIO_REEXECUTE_SUSPEND   0x02
 365
 366 typedef struct zio_alloc_list {
 367         list_t  zal_list;
 368         uint64_t zal_size;
 369 } zio_alloc_list_t;
 370
 371 typedef struct zio_link {
 372         zio_t           *zl_parent;
 373         zio_t           *zl_child;
 374         list_node_t     zl_parent_node;
 375         list_node_t     zl_child_node;
 376 } zio_link_t;
 377
 378 struct zio {
 379         /* Core information about this I/O */
 380         zbookmark_phys_t        io_bookmark;
 381         zio_prop_t      io_prop;
 382         zio_type_t      io_type;
 383         enum zio_child  io_child_type;
 384         int             io_cmd;
 385         zio_priority_t  io_priority;
 386         uint8_t         io_reexecute;
 387         uint8_t         io_state[ZIO_WAIT_TYPES];
 388         uint64_t        io_txg;
 389         spa_t           *io_spa;
 390         blkptr_t        *io_bp;
 391         blkptr_t        *io_bp_override;
 392         blkptr_t        io_bp_copy;
 393         list_t          io_parent_list;
 394         list_t          io_child_list;
 395         zio_t           *io_logical;
 396         zio_transform_t *io_transform_stack;
 397
 398         /* Callback info */
 399         zio_done_func_t *io_ready;
 400         zio_done_func_t *io_children_ready;
 401         zio_done_func_t *io_physdone;
 402         zio_done_func_t *io_done;
 403         void            *io_private;
 404         int64_t         io_prev_space_delta;    /* DMU private */
 405         blkptr_t        io_bp_orig;
 406
 407         /* Data represented by this I/O */
 408         struct abd      *io_abd;
 409         struct abd      *io_orig_abd;
 410         uint64_t        io_size;
 411         uint64_t        io_orig_size;
 412         /* io_lsize != io_orig_size iff this is a raw write */
 413         uint64_t        io_lsize;
 414
 415         /* Stuff for the vdev stack */
 416         vdev_t          *io_vd;
 417         void            *io_vsd;
 418         const zio_vsd_ops_t *io_vsd_ops;
 419
 420         uint64_t        io_offset;
 421         hrtime_t        io_timestamp;
 422         hrtime_t        io_queued_timestamp;
 423         hrtime_t        io_target_timestamp;
 424         avl_node_t      io_queue_node;
 425         avl_node_t      io_offset_node;
 426         avl_node_t      io_alloc_node;
 427         zio_alloc_list_t        io_alloc_list;
 428
 429         /* Internal pipeline state */
 430         enum zio_flag   io_flags;
 431         enum zio_stage  io_stage;
 432         enum zio_stage  io_pipeline;
 433         enum zio_flag   io_orig_flags;
 434         enum zio_stage  io_orig_stage;
 435         enum zio_stage  io_orig_pipeline;
 436         enum zio_stage  io_pipeline_trace;
 437         int             io_error;
 438         int             io_child_error[ZIO_CHILD_TYPES];
 439         uint64_t        io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
 440         uint64_t        io_child_count;
 441         uint64_t        io_phys_children;
 442         uint64_t        io_parent_count;
 443         uint64_t        *io_stall;
 444         zio_t           *io_gang_leader;
 445         zio_gang_node_t *io_gang_tree;
 446         void            *io_executor;
 447         void            *io_waiter;
 448         kmutex_t        io_lock;
 449         kcondvar_t      io_cv;
 450
 451         /* FMA state */
 452         zio_cksum_report_t *io_cksum_report;
 453         uint64_t        io_ena;
 454
 455         /* Taskq dispatching state */
 456         taskq_ent_t     io_tqent;
 457 };
 458
 459 extern int zio_bookmark_compare(const void *, const void *);
 460
 461 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
 462     zio_done_func_t *done, void *private, enum zio_flag flags);
 463
 464 extern zio_t *zio_root(spa_t *spa,
 465     zio_done_func_t *done, void *private, enum zio_flag flags);
 466
 467 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
 468     struct abd *data, uint64_t lsize, zio_done_func_t *done, void *private,
 469     zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
 470
 471 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
 472     struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp,
 473     zio_done_func_t *ready, zio_done_func_t *children_ready,
 474     zio_done_func_t *physdone, zio_done_func_t *done,
 475     void *private, zio_priority_t priority, enum zio_flag flags,
 476     const zbookmark_phys_t *zb);
 477
 478 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
 479     struct abd *data, uint64_t size, zio_done_func_t *done, void *private,
 480     zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb);
 481
 482 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
 483     boolean_t nopwrite);
 484
 485 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
 486
 487 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
 488     const blkptr_t *bp,
 489     zio_done_func_t *done, void *private, enum zio_flag flags);
 490
 491 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
 492     zio_done_func_t *done, void *private, enum zio_flag flags);
 493
 494 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
 495     uint64_t size, struct abd *data, int checksum,
 496     zio_done_func_t *done, void *private, zio_priority_t priority,
 497     enum zio_flag flags, boolean_t labels);
 498
 499 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
 500     uint64_t size, struct abd *data, int checksum,
 501     zio_done_func_t *done, void *private, zio_priority_t priority,
 502     enum zio_flag flags, boolean_t labels);
 503
 504 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
 505     const blkptr_t *bp, enum zio_flag flags);
 506
 507 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
 508     blkptr_t *old_bp, uint64_t size, boolean_t *slog);
 509 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
 510 extern void zio_flush(zio_t *zio, vdev_t *vd);
 511 extern void zio_shrink(zio_t *zio, uint64_t size);
 512
 513 extern int zio_wait(zio_t *zio);
 514 extern void zio_nowait(zio_t *zio);
 515 extern void zio_execute(zio_t *zio);
 516 extern void zio_interrupt(zio_t *zio);
 517 extern void zio_delay_init(zio_t *zio);
 518 extern void zio_delay_interrupt(zio_t *zio);
 519
 520 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **);
 521 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **);
 522 extern zio_t *zio_unique_parent(zio_t *cio);
 523 extern void zio_add_child(zio_t *pio, zio_t *cio);
 524
 525 extern void *zio_buf_alloc(size_t size);
 526 extern void zio_buf_free(void *buf, size_t size);
 527 extern void *zio_data_buf_alloc(size_t size);
 528 extern void zio_data_buf_free(void *buf, size_t size);
 529
 530 extern void zio_push_transform(zio_t *zio, struct abd *abd, uint64_t size,
 531     uint64_t bufsize, zio_transform_func_t *transform);
 532 extern void zio_pop_transforms(zio_t *zio);
 533
 534 extern void zio_resubmit_stage_async(void *);
 535
 536 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
 537     uint64_t offset, struct abd *data, uint64_t size, int type,
 538     zio_priority_t priority, enum zio_flag flags,
 539     zio_done_func_t *done, void *private);
 540
 541 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
 542     struct abd *data, uint64_t size, int type, zio_priority_t priority,
 543     enum zio_flag flags, zio_done_func_t *done, void *private);
 544
 545 extern void zio_vdev_io_bypass(zio_t *zio);
 546 extern void zio_vdev_io_reissue(zio_t *zio);
 547 extern void zio_vdev_io_redone(zio_t *zio);
 548
 549 extern void zio_checksum_verified(zio_t *zio);
 550 extern int zio_worst_error(int e1, int e2);
 551
 552 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
 553     enum zio_checksum parent);
 554 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
 555     enum zio_checksum child, enum zio_checksum parent);
 556 extern enum zio_compress zio_compress_select(spa_t *spa,
 557     enum zio_compress child, enum zio_compress parent);
 558
 559 extern void zio_suspend(spa_t *spa, zio_t *zio);
 560 extern int zio_resume(spa_t *spa);
 561 extern void zio_resume_wait(spa_t *spa);
 562
 563 /*
 564  * Initial setup and teardown.
 565  */
 566 extern void zio_init(void);
 567 extern void zio_fini(void);
 568
 569 /*
 570  * Fault injection
 571  */
 572 struct zinject_record;
 573 extern uint32_t zio_injection_enabled;
 574 extern int zio_inject_fault(char *name, int flags, int *id,
 575     struct zinject_record *record);
 576 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
 577     struct zinject_record *record);
 578 extern int zio_clear_fault(int id);
 579 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
 580 extern int zio_handle_fault_injection(zio_t *zio, int error);
 581 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
 582 extern int zio_handle_label_injection(zio_t *zio, int error);
 583 extern void zio_handle_ignored_writes(zio_t *zio);
 584 extern hrtime_t zio_handle_io_delay(zio_t *zio);
 585
 586 /*
 587  * Checksum ereport functions
 588  */
 589 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
 590     uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
 591 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
 592     const void *good_data, const void *bad_data, boolean_t drop_if_identical);
 593
 594 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
 595 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
 596
 597 /* If we have the good data in hand, this function can be used */
 598 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
 599     struct zio *zio, uint64_t offset, uint64_t length,
 600     const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
 601
 602 /* Called from spa_sync(), but primarily an injection handler */
 603 extern void spa_handle_ignored_writes(spa_t *spa);
 604
 605 /* zbookmark_phys functions */
 606 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp,
 607     const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
 608 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2,
 609     uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);
 610
 611 #ifdef  __cplusplus
 612 }
 613 #endif
 614
 615 #endif  /* _ZIO_H */