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  */
  25
  26 #ifndef _ZIO_H
  27 #define _ZIO_H
  28
  29 #include <sys/zfs_context.h>
  30 #include <sys/spa.h>
  31 #include <sys/txg.h>
  32 #include <sys/avl.h>
  33 #include <sys/fs/zfs.h>
  34 #include <sys/zio_impl.h>
  35
  36 #ifdef  __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 /*
  41  * Embedded checksum
  42  */
  43 #define ZEC_MAGIC       0x210da7ab10c7a11ULL
  44
  45 typedef struct zio_eck {
  46         uint64_t        zec_magic;      /* for validation, endianness   */
  47         zio_cksum_t     zec_cksum;      /* 256-bit checksum             */
  48 } zio_eck_t;
  49
  50 /*
  51  * Gang block headers are self-checksumming and contain an array
  52  * of block pointers.
  53  */
  54 #define SPA_GANGBLOCKSIZE       SPA_MINBLOCKSIZE
  55 #define SPA_GBH_NBLKPTRS        ((SPA_GANGBLOCKSIZE - \
  56         sizeof (zio_eck_t)) / sizeof (blkptr_t))
  57 #define SPA_GBH_FILLER          ((SPA_GANGBLOCKSIZE - \
  58         sizeof (zio_eck_t) - \
  59         (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
  60         sizeof (uint64_t))
  61
  62 typedef struct zio_gbh {
  63         blkptr_t                zg_blkptr[SPA_GBH_NBLKPTRS];
  64         uint64_t                zg_filler[SPA_GBH_FILLER];
  65         zio_eck_t               zg_tail;
  66 } zio_gbh_phys_t;
  67
  68 enum zio_checksum {
  69         ZIO_CHECKSUM_INHERIT = 0,
  70         ZIO_CHECKSUM_ON,
  71         ZIO_CHECKSUM_OFF,
  72         ZIO_CHECKSUM_LABEL,
  73         ZIO_CHECKSUM_GANG_HEADER,
  74         ZIO_CHECKSUM_ZILOG,
  75         ZIO_CHECKSUM_FLETCHER_2,
  76         ZIO_CHECKSUM_FLETCHER_4,
  77         ZIO_CHECKSUM_SHA256,
  78         ZIO_CHECKSUM_ZILOG2,
  79         ZIO_CHECKSUM_FUNCTIONS
  80 };
  81
  82 #define ZIO_CHECKSUM_ON_VALUE   ZIO_CHECKSUM_FLETCHER_4
  83 #define ZIO_CHECKSUM_DEFAULT    ZIO_CHECKSUM_ON
  84
  85 #define ZIO_CHECKSUM_MASK       0xffULL
  86 #define ZIO_CHECKSUM_VERIFY     (1 << 8)
  87
  88 #define ZIO_DEDUPCHECKSUM       ZIO_CHECKSUM_SHA256
  89 #define ZIO_DEDUPDITTO_MIN      100
  90
  91 enum zio_compress {
  92         ZIO_COMPRESS_INHERIT = 0,
  93         ZIO_COMPRESS_ON,
  94         ZIO_COMPRESS_OFF,
  95         ZIO_COMPRESS_LZJB,
  96         ZIO_COMPRESS_EMPTY,
  97         ZIO_COMPRESS_GZIP_1,
  98         ZIO_COMPRESS_GZIP_2,
  99         ZIO_COMPRESS_GZIP_3,
 100         ZIO_COMPRESS_GZIP_4,
 101         ZIO_COMPRESS_GZIP_5,
 102         ZIO_COMPRESS_GZIP_6,
 103         ZIO_COMPRESS_GZIP_7,
 104         ZIO_COMPRESS_GZIP_8,
 105         ZIO_COMPRESS_GZIP_9,
 106         ZIO_COMPRESS_ZLE,
 107         ZIO_COMPRESS_FUNCTIONS
 108 };
 109
 110 #define ZIO_COMPRESS_ON_VALUE   ZIO_COMPRESS_LZJB
 111 #define ZIO_COMPRESS_DEFAULT    ZIO_COMPRESS_OFF
 112
 113 #define BOOTFS_COMPRESS_VALID(compress)                 \
 114         ((compress) == ZIO_COMPRESS_LZJB ||             \
 115         ((compress) == ZIO_COMPRESS_ON &&               \
 116         ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) ||  \
 117         (compress) == ZIO_COMPRESS_OFF)
 118
 119 #define ZIO_FAILURE_MODE_WAIT           0
 120 #define ZIO_FAILURE_MODE_CONTINUE       1
 121 #define ZIO_FAILURE_MODE_PANIC          2
 122
 123 #define ZIO_PRIORITY_NOW                (zio_priority_table[0])
 124 #define ZIO_PRIORITY_SYNC_READ          (zio_priority_table[1])
 125 #define ZIO_PRIORITY_SYNC_WRITE         (zio_priority_table[2])
 126 #define ZIO_PRIORITY_LOG_WRITE          (zio_priority_table[3])
 127 #define ZIO_PRIORITY_CACHE_FILL         (zio_priority_table[4])
 128 #define ZIO_PRIORITY_AGG                (zio_priority_table[5])
 129 #define ZIO_PRIORITY_FREE               (zio_priority_table[6])
 130 #define ZIO_PRIORITY_ASYNC_WRITE        (zio_priority_table[7])
 131 #define ZIO_PRIORITY_ASYNC_READ         (zio_priority_table[8])
 132 #define ZIO_PRIORITY_RESILVER           (zio_priority_table[9])
 133 #define ZIO_PRIORITY_SCRUB              (zio_priority_table[10])
 134 #define ZIO_PRIORITY_DDT_PREFETCH       (zio_priority_table[11])
 135 #define ZIO_PRIORITY_TABLE_SIZE         12
 136
 137 #define ZIO_PIPELINE_CONTINUE           0x100
 138 #define ZIO_PIPELINE_STOP               0x101
 139
 140 enum zio_flag {
 141         /*
 142          * Flags inherited by gang, ddt, and vdev children,
 143          * and that must be equal for two zios to aggregate
 144          */
 145         ZIO_FLAG_DONT_AGGREGATE = 1 << 0,
 146         ZIO_FLAG_IO_REPAIR      = 1 << 1,
 147         ZIO_FLAG_SELF_HEAL      = 1 << 2,
 148         ZIO_FLAG_RESILVER       = 1 << 3,
 149         ZIO_FLAG_SCRUB          = 1 << 4,
 150         ZIO_FLAG_SCAN_THREAD    = 1 << 5,
 151
 152 #define ZIO_FLAG_AGG_INHERIT    (ZIO_FLAG_CANFAIL - 1)
 153
 154         /*
 155          * Flags inherited by ddt, gang, and vdev children.
 156          */
 157         ZIO_FLAG_CANFAIL        = 1 << 6,       /* must be first for INHERIT */
 158         ZIO_FLAG_SPECULATIVE    = 1 << 7,
 159         ZIO_FLAG_CONFIG_WRITER  = 1 << 8,
 160         ZIO_FLAG_DONT_RETRY     = 1 << 9,
 161         ZIO_FLAG_DONT_CACHE     = 1 << 10,
 162         ZIO_FLAG_NODATA         = 1 << 11,
 163         ZIO_FLAG_INDUCE_DAMAGE  = 1 << 12,
 164
 165 #define ZIO_FLAG_DDT_INHERIT    (ZIO_FLAG_IO_RETRY - 1)
 166 #define ZIO_FLAG_GANG_INHERIT   (ZIO_FLAG_IO_RETRY - 1)
 167
 168         /*
 169          * Flags inherited by vdev children.
 170          */
 171         ZIO_FLAG_IO_RETRY       = 1 << 13,      /* must be first for INHERIT */
 172         ZIO_FLAG_PROBE          = 1 << 14,
 173         ZIO_FLAG_TRYHARD        = 1 << 15,
 174         ZIO_FLAG_OPTIONAL       = 1 << 16,
 175
 176 #define ZIO_FLAG_VDEV_INHERIT   (ZIO_FLAG_DONT_QUEUE - 1)
 177
 178         /*
 179          * Flags not inherited by any children.
 180          */
 181         ZIO_FLAG_DONT_QUEUE     = 1 << 17,      /* must be first for INHERIT */
 182         ZIO_FLAG_DONT_PROPAGATE = 1 << 18,
 183         ZIO_FLAG_IO_BYPASS      = 1 << 19,
 184         ZIO_FLAG_IO_REWRITE     = 1 << 20,
 185         ZIO_FLAG_RAW            = 1 << 21,
 186         ZIO_FLAG_GANG_CHILD     = 1 << 22,
 187         ZIO_FLAG_DDT_CHILD      = 1 << 23,
 188         ZIO_FLAG_GODFATHER      = 1 << 24
 189 };
 190
 191 #define ZIO_FLAG_MUSTSUCCEED            0
 192
 193 #define ZIO_DDT_CHILD_FLAGS(zio)                                \
 194         (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) |             \
 195         ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
 196
 197 #define ZIO_GANG_CHILD_FLAGS(zio)                               \
 198         (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) |            \
 199         ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
 200
 201 #define ZIO_VDEV_CHILD_FLAGS(zio)                               \
 202         (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) |            \
 203         ZIO_FLAG_CANFAIL)
 204
 205 enum zio_child {
 206         ZIO_CHILD_VDEV = 0,
 207         ZIO_CHILD_GANG,
 208         ZIO_CHILD_DDT,
 209         ZIO_CHILD_LOGICAL,
 210         ZIO_CHILD_TYPES
 211 };
 212
 213 enum zio_wait_type {
 214         ZIO_WAIT_READY = 0,
 215         ZIO_WAIT_DONE,
 216         ZIO_WAIT_TYPES
 217 };
 218
 219 /*
 220  * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
 221  * graveyard) to indicate checksum errors and fragmentation.
 222  */
 223 #define ECKSUM  EBADE
 224 #define EFRAGS  EBADR
 225
 226 typedef void zio_done_func_t(zio_t *zio);
 227
 228 extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE];
 229 extern char *zio_type_name[ZIO_TYPES];
 230
 231 /*
 232  * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
 233  * identifies any block in the pool.  By convention, the meta-objset (MOS)
 234  * is objset 0, and the meta-dnode is object 0.  This covers all blocks
 235  * except root blocks and ZIL blocks, which are defined as follows:
 236  *
 237  * Root blocks (objset_phys_t) are object 0, level -1:  <objset, 0, -1, 0>.
 238  * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
 239  * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
 240  *
 241  * Note: this structure is called a bookmark because its original purpose
 242  * was to remember where to resume a pool-wide traverse.
 243  *
 244  * Note: this structure is passed between userland and the kernel.
 245  * Therefore it must not change size or alignment between 32/64 bit
 246  * compilation options.
 247  */
 248 typedef struct zbookmark {
 249         uint64_t        zb_objset;
 250         uint64_t        zb_object;
 251         int64_t         zb_level;
 252         uint64_t        zb_blkid;
 253 } zbookmark_t;
 254
 255 #define SET_BOOKMARK(zb, objset, object, level, blkid)  \
 256 {                                                       \
 257         (zb)->zb_objset = objset;                       \
 258         (zb)->zb_object = object;                       \
 259         (zb)->zb_level = level;                         \
 260         (zb)->zb_blkid = blkid;                         \
 261 }
 262
 263 #define ZB_DESTROYED_OBJSET     (-1ULL)
 264
 265 #define ZB_ROOT_OBJECT          (0ULL)
 266 #define ZB_ROOT_LEVEL           (-1LL)
 267 #define ZB_ROOT_BLKID           (0ULL)
 268
 269 #define ZB_ZIL_OBJECT           (0ULL)
 270 #define ZB_ZIL_LEVEL            (-2LL)
 271
 272 typedef struct zio_prop {
 273         enum zio_checksum       zp_checksum;
 274         enum zio_compress       zp_compress;
 275         dmu_object_type_t       zp_type;
 276         uint8_t                 zp_level;
 277         uint8_t                 zp_copies;
 278         uint8_t                 zp_dedup;
 279         uint8_t                 zp_dedup_verify;
 280 } zio_prop_t;
 281
 282 typedef struct zio_cksum_report zio_cksum_report_t;
 283
 284 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
 285     const void *good_data);
 286 typedef void zio_cksum_free_f(void *cbdata, size_t size);
 287
 288 struct zio_bad_cksum;                           /* defined in zio_checksum.h */
 289
 290 struct zio_cksum_report {
 291         struct zio_cksum_report *zcr_next;
 292         nvlist_t                *zcr_ereport;
 293         nvlist_t                *zcr_detector;
 294         void                    *zcr_cbdata;
 295         size_t                  zcr_cbinfo;     /* passed to zcr_free() */
 296         uint64_t                zcr_align;
 297         uint64_t                zcr_length;
 298         zio_cksum_finish_f      *zcr_finish;
 299         zio_cksum_free_f        *zcr_free;
 300
 301         /* internal use only */
 302         struct zio_bad_cksum    *zcr_ckinfo;    /* information from failure */
 303 };
 304
 305 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
 306     void *arg);
 307
 308 zio_vsd_cksum_report_f  zio_vsd_default_cksum_report;
 309
 310 typedef struct zio_vsd_ops {
 311         zio_done_func_t         *vsd_free;
 312         zio_vsd_cksum_report_f  *vsd_cksum_report;
 313 } zio_vsd_ops_t;
 314
 315 typedef struct zio_gang_node {
 316         zio_gbh_phys_t          *gn_gbh;
 317         struct zio_gang_node    *gn_child[SPA_GBH_NBLKPTRS];
 318 } zio_gang_node_t;
 319
 320 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
 321     zio_gang_node_t *gn, void *data);
 322
 323 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
 324
 325 typedef struct zio_transform {
 326         void                    *zt_orig_data;
 327         uint64_t                zt_orig_size;
 328         uint64_t                zt_bufsize;
 329         zio_transform_func_t    *zt_transform;
 330         struct zio_transform    *zt_next;
 331 } zio_transform_t;
 332
 333 typedef int zio_pipe_stage_t(zio_t *zio);
 334
 335 /*
 336  * The io_reexecute flags are distinct from io_flags because the child must
 337  * be able to propagate them to the parent.  The normal io_flags are local
 338  * to the zio, not protected by any lock, and not modifiable by children;
 339  * the reexecute flags are protected by io_lock, modifiable by children,
 340  * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
 341  */
 342 #define ZIO_REEXECUTE_NOW       0x01
 343 #define ZIO_REEXECUTE_SUSPEND   0x02
 344
 345 typedef struct zio_link {
 346         zio_t           *zl_parent;
 347         zio_t           *zl_child;
 348         list_node_t     zl_parent_node;
 349         list_node_t     zl_child_node;
 350 } zio_link_t;
 351
 352 struct zio {
 353         /* Core information about this I/O */
 354         zbookmark_t     io_bookmark;
 355         zio_prop_t      io_prop;
 356         zio_type_t      io_type;
 357         enum zio_child  io_child_type;
 358         int             io_cmd;
 359         uint8_t         io_priority;
 360         uint8_t         io_reexecute;
 361         uint8_t         io_state[ZIO_WAIT_TYPES];
 362         uint64_t        io_txg;
 363         spa_t           *io_spa;
 364         blkptr_t        *io_bp;
 365         blkptr_t        *io_bp_override;
 366         blkptr_t        io_bp_copy;
 367         list_t          io_parent_list;
 368         list_t          io_child_list;
 369         zio_link_t      *io_walk_link;
 370         zio_t           *io_logical;
 371         zio_transform_t *io_transform_stack;
 372
 373         /* Callback info */
 374         zio_done_func_t *io_ready;
 375         zio_done_func_t *io_done;
 376         void            *io_private;
 377         int64_t         io_prev_space_delta;    /* DMU private */
 378         blkptr_t        io_bp_orig;
 379
 380         /* Data represented by this I/O */
 381         void            *io_data;
 382         void            *io_orig_data;
 383         uint64_t        io_size;
 384         uint64_t        io_orig_size;
 385
 386         /* Stuff for the vdev stack */
 387         vdev_t          *io_vd;
 388         void            *io_vsd;
 389         const zio_vsd_ops_t *io_vsd_ops;
 390
 391         uint64_t        io_offset;
 392         uint64_t        io_deadline;
 393         avl_node_t      io_offset_node;
 394         avl_node_t      io_deadline_node;
 395         avl_tree_t      *io_vdev_tree;
 396
 397         /* Internal pipeline state */
 398         enum zio_flag   io_flags;
 399         enum zio_stage  io_stage;
 400         enum zio_stage  io_pipeline;
 401         enum zio_flag   io_orig_flags;
 402         enum zio_stage  io_orig_stage;
 403         enum zio_stage  io_orig_pipeline;
 404         int             io_error;
 405         int             io_child_error[ZIO_CHILD_TYPES];
 406         uint64_t        io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
 407         uint64_t        io_child_count;
 408         uint64_t        io_parent_count;
 409         uint64_t        *io_stall;
 410         zio_t           *io_gang_leader;
 411         zio_gang_node_t *io_gang_tree;
 412         void            *io_executor;
 413         void            *io_waiter;
 414         kmutex_t        io_lock;
 415         kcondvar_t      io_cv;
 416
 417         /* FMA state */
 418         zio_cksum_report_t *io_cksum_report;
 419         uint64_t        io_ena;
 420 };
 421
 422 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
 423     zio_done_func_t *done, void *private, enum zio_flag flags);
 424
 425 extern zio_t *zio_root(spa_t *spa,
 426     zio_done_func_t *done, void *private, enum zio_flag flags);
 427
 428 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
 429     uint64_t size, zio_done_func_t *done, void *private,
 430     int priority, enum zio_flag flags, const zbookmark_t *zb);
 431
 432 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
 433     void *data, uint64_t size, const zio_prop_t *zp,
 434     zio_done_func_t *ready, zio_done_func_t *done, void *private,
 435     int priority, enum zio_flag flags, const zbookmark_t *zb);
 436
 437 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
 438     void *data, uint64_t size, zio_done_func_t *done, void *private,
 439     int priority, enum zio_flag flags, zbookmark_t *zb);
 440
 441 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies);
 442
 443 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
 444
 445 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
 446     const blkptr_t *bp,
 447     zio_done_func_t *done, void *private, enum zio_flag flags);
 448
 449 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
 450     zio_done_func_t *done, void *private, int priority, enum zio_flag flags);
 451
 452 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
 453     uint64_t size, void *data, int checksum,
 454     zio_done_func_t *done, void *private, int priority, enum zio_flag flags,
 455     boolean_t labels);
 456
 457 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
 458     uint64_t size, void *data, int checksum,
 459     zio_done_func_t *done, void *private, int priority, enum zio_flag flags,
 460     boolean_t labels);
 461
 462 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
 463     const blkptr_t *bp, enum zio_flag flags);
 464
 465 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
 466     blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
 467 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
 468 extern void zio_flush(zio_t *zio, vdev_t *vd);
 469 extern void zio_shrink(zio_t *zio, uint64_t size);
 470
 471 extern int zio_wait(zio_t *zio);
 472 extern void zio_nowait(zio_t *zio);
 473 extern void zio_execute(zio_t *zio);
 474 extern void zio_interrupt(zio_t *zio);
 475
 476 extern zio_t *zio_walk_parents(zio_t *cio);
 477 extern zio_t *zio_walk_children(zio_t *pio);
 478 extern zio_t *zio_unique_parent(zio_t *cio);
 479 extern void zio_add_child(zio_t *pio, zio_t *cio);
 480
 481 extern void *zio_buf_alloc(size_t size);
 482 extern void zio_buf_free(void *buf, size_t size);
 483 extern void *zio_data_buf_alloc(size_t size);
 484 extern void zio_data_buf_free(void *buf, size_t size);
 485
 486 extern void zio_resubmit_stage_async(void *);
 487
 488 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
 489     uint64_t offset, void *data, uint64_t size, int type, int priority,
 490     enum zio_flag flags, zio_done_func_t *done, void *private);
 491
 492 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
 493     void *data, uint64_t size, int type, int priority,
 494     enum zio_flag flags, zio_done_func_t *done, void *private);
 495
 496 extern void zio_vdev_io_bypass(zio_t *zio);
 497 extern void zio_vdev_io_reissue(zio_t *zio);
 498 extern void zio_vdev_io_redone(zio_t *zio);
 499
 500 extern void zio_checksum_verified(zio_t *zio);
 501 extern int zio_worst_error(int e1, int e2);
 502
 503 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
 504     enum zio_checksum parent);
 505 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
 506     enum zio_checksum child, enum zio_checksum parent);
 507 extern enum zio_compress zio_compress_select(enum zio_compress child,
 508     enum zio_compress parent);
 509
 510 extern void zio_suspend(spa_t *spa, zio_t *zio);
 511 extern int zio_resume(spa_t *spa);
 512 extern void zio_resume_wait(spa_t *spa);
 513
 514 /*
 515  * Initial setup and teardown.
 516  */
 517 extern void zio_init(void);
 518 extern void zio_fini(void);
 519
 520 /*
 521  * Fault injection
 522  */
 523 struct zinject_record;
 524 extern uint32_t zio_injection_enabled;
 525 extern int zio_inject_fault(char *name, int flags, int *id,
 526     struct zinject_record *record);
 527 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
 528     struct zinject_record *record);
 529 extern int zio_clear_fault(int id);
 530 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
 531 extern int zio_handle_fault_injection(zio_t *zio, int error);
 532 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
 533 extern int zio_handle_label_injection(zio_t *zio, int error);
 534 extern void zio_handle_ignored_writes(zio_t *zio);
 535
 536 /*
 537  * Checksum ereport functions
 538  */
 539 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
 540     uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
 541 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
 542     const void *good_data, const void *bad_data, boolean_t drop_if_identical);
 543
 544 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
 545 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
 546
 547 /* If we have the good data in hand, this function can be used */
 548 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
 549     struct zio *zio, uint64_t offset, uint64_t length,
 550     const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
 551
 552 /* Called from spa_sync(), but primarily an injection handler */
 553 extern void spa_handle_ignored_writes(spa_t *spa);
 554
 555 #ifdef  __cplusplus
 556 }
 557 #endif
 558
 559 #endif  /* _ZIO_H */