zio.h revision 269416
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, 2014 by Delphix. All rights reserved. 26 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 27 */ 28 29#ifndef _ZIO_H 30#define _ZIO_H 31 32#include <sys/zfs_context.h> 33#include <sys/spa.h> 34#include <sys/txg.h> 35#include <sys/avl.h> 36#include <sys/kstat.h> 37#include <sys/fs/zfs.h> 38#include <sys/zio_impl.h> 39 40#ifdef __cplusplus 41extern "C" { 42#endif 43 44/* 45 * Embedded checksum 46 */ 47#define ZEC_MAGIC 0x210da7ab10c7a11ULL 48 49typedef struct zio_eck { 50 uint64_t zec_magic; /* for validation, endianness */ 51 zio_cksum_t zec_cksum; /* 256-bit checksum */ 52} zio_eck_t; 53 54/* 55 * Gang block headers are self-checksumming and contain an array 56 * of block pointers. 57 */ 58#define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE 59#define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ 60 sizeof (zio_eck_t)) / sizeof (blkptr_t)) 61#define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ 62 sizeof (zio_eck_t) - \ 63 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\ 64 sizeof (uint64_t)) 65 66typedef struct zio_gbh { 67 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; 68 uint64_t zg_filler[SPA_GBH_FILLER]; 69 zio_eck_t zg_tail; 70} zio_gbh_phys_t; 71 72enum zio_checksum { 73 ZIO_CHECKSUM_INHERIT = 0, 74 ZIO_CHECKSUM_ON, 75 ZIO_CHECKSUM_OFF, 76 ZIO_CHECKSUM_LABEL, 77 ZIO_CHECKSUM_GANG_HEADER, 78 ZIO_CHECKSUM_ZILOG, 79 ZIO_CHECKSUM_FLETCHER_2, 80 ZIO_CHECKSUM_FLETCHER_4, 81 ZIO_CHECKSUM_SHA256, 82 ZIO_CHECKSUM_ZILOG2, 83 ZIO_CHECKSUM_NOPARITY, 84 ZIO_CHECKSUM_FUNCTIONS 85}; 86 87/* 88 * The number of "legacy" compression functions which can be set on individual 89 * objects. 90 */ 91#define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2 92 93#define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 94#define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 95 96#define ZIO_CHECKSUM_MASK 0xffULL 97#define ZIO_CHECKSUM_VERIFY (1 << 8) 98 99#define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 100#define ZIO_DEDUPDITTO_MIN 100 101 102enum zio_compress { 103 ZIO_COMPRESS_INHERIT = 0, 104 ZIO_COMPRESS_ON, 105 ZIO_COMPRESS_OFF, 106 ZIO_COMPRESS_LZJB, 107 ZIO_COMPRESS_EMPTY, 108 ZIO_COMPRESS_GZIP_1, 109 ZIO_COMPRESS_GZIP_2, 110 ZIO_COMPRESS_GZIP_3, 111 ZIO_COMPRESS_GZIP_4, 112 ZIO_COMPRESS_GZIP_5, 113 ZIO_COMPRESS_GZIP_6, 114 ZIO_COMPRESS_GZIP_7, 115 ZIO_COMPRESS_GZIP_8, 116 ZIO_COMPRESS_GZIP_9, 117 ZIO_COMPRESS_ZLE, 118 ZIO_COMPRESS_LZ4, 119 ZIO_COMPRESS_FUNCTIONS 120}; 121 122/* 123 * The number of "legacy" compression functions which can be set on individual 124 * objects. 125 */ 126#define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4 127 128/* N.B. when altering this value, also change BOOTFS_COMPRESS_VALID below */ 129#define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB 130#define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 131 132#define BOOTFS_COMPRESS_VALID(compress) \ 133 ((compress) == ZIO_COMPRESS_LZJB || \ 134 (compress) == ZIO_COMPRESS_LZ4 || \ 135 ((compress) == ZIO_COMPRESS_ON && \ 136 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \ 137 (compress) == ZIO_COMPRESS_OFF) 138 139#define ZIO_FAILURE_MODE_WAIT 0 140#define ZIO_FAILURE_MODE_CONTINUE 1 141#define ZIO_FAILURE_MODE_PANIC 2 142 143typedef enum zio_priority { 144 ZIO_PRIORITY_SYNC_READ, 145 ZIO_PRIORITY_SYNC_WRITE, /* ZIL */ 146 ZIO_PRIORITY_ASYNC_READ, /* prefetch */ 147 ZIO_PRIORITY_ASYNC_WRITE, /* spa_sync() */ 148 ZIO_PRIORITY_SCRUB, /* asynchronous scrub/resilver reads */ 149 ZIO_PRIORITY_NUM_QUEUEABLE, 150 151 ZIO_PRIORITY_NOW /* non-queued i/os (e.g. free) */ 152} zio_priority_t; 153 154#define ZIO_PIPELINE_CONTINUE 0x100 155#define ZIO_PIPELINE_STOP 0x101 156 157enum zio_flag { 158 /* 159 * Flags inherited by gang, ddt, and vdev children, 160 * and that must be equal for two zios to aggregate 161 */ 162 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 163 ZIO_FLAG_IO_REPAIR = 1 << 1, 164 ZIO_FLAG_SELF_HEAL = 1 << 2, 165 ZIO_FLAG_RESILVER = 1 << 3, 166 ZIO_FLAG_SCRUB = 1 << 4, 167 ZIO_FLAG_SCAN_THREAD = 1 << 5, 168 ZIO_FLAG_PHYSICAL = 1 << 6, 169 170#define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 171 172 /* 173 * Flags inherited by ddt, gang, and vdev children. 174 */ 175 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 176 ZIO_FLAG_SPECULATIVE = 1 << 8, 177 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 178 ZIO_FLAG_DONT_RETRY = 1 << 10, 179 ZIO_FLAG_DONT_CACHE = 1 << 11, 180 ZIO_FLAG_NODATA = 1 << 12, 181 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 182 183#define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 184#define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 185 186 /* 187 * Flags inherited by vdev children. 188 */ 189 ZIO_FLAG_IO_RETRY = 1 << 14, /* must be first for INHERIT */ 190 ZIO_FLAG_PROBE = 1 << 15, 191 ZIO_FLAG_TRYHARD = 1 << 16, 192 ZIO_FLAG_OPTIONAL = 1 << 17, 193 194#define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 195 196 /* 197 * Flags not inherited by any children. 198 */ 199 ZIO_FLAG_DONT_QUEUE = 1 << 18, /* must be first for INHERIT */ 200 ZIO_FLAG_DONT_PROPAGATE = 1 << 19, 201 ZIO_FLAG_IO_BYPASS = 1 << 20, 202 ZIO_FLAG_IO_REWRITE = 1 << 21, 203 ZIO_FLAG_RAW = 1 << 22, 204 ZIO_FLAG_GANG_CHILD = 1 << 23, 205 ZIO_FLAG_DDT_CHILD = 1 << 24, 206 ZIO_FLAG_GODFATHER = 1 << 25, 207 ZIO_FLAG_NOPWRITE = 1 << 26, 208 ZIO_FLAG_REEXECUTED = 1 << 27, 209 ZIO_FLAG_DELEGATED = 1 << 28, 210}; 211 212#define ZIO_FLAG_MUSTSUCCEED 0 213 214#define ZIO_DDT_CHILD_FLAGS(zio) \ 215 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 216 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 217 218#define ZIO_GANG_CHILD_FLAGS(zio) \ 219 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 220 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 221 222#define ZIO_VDEV_CHILD_FLAGS(zio) \ 223 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 224 ZIO_FLAG_CANFAIL) 225 226enum zio_child { 227 ZIO_CHILD_VDEV = 0, 228 ZIO_CHILD_GANG, 229 ZIO_CHILD_DDT, 230 ZIO_CHILD_LOGICAL, 231 ZIO_CHILD_TYPES 232}; 233 234enum zio_wait_type { 235 ZIO_WAIT_READY = 0, 236 ZIO_WAIT_DONE, 237 ZIO_WAIT_TYPES 238}; 239 240/* 241 * We'll take the number 122 and 123 to indicate checksum errors and 242 * fragmentation. Those doesn't collide with any errno values as they 243 * are greater than ELAST. 244 */ 245#define ECKSUM 122 246#define EFRAGS 123 247 248typedef void zio_done_func_t(zio_t *zio); 249 250extern const char *zio_type_name[ZIO_TYPES]; 251 252/* 253 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 254 * identifies any block in the pool. By convention, the meta-objset (MOS) 255 * is objset 0, and the meta-dnode is object 0. This covers all blocks 256 * except root blocks and ZIL blocks, which are defined as follows: 257 * 258 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 259 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 260 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 261 * 262 * Note: this structure is called a bookmark because its original purpose 263 * was to remember where to resume a pool-wide traverse. 264 * 265 * Note: this structure is passed between userland and the kernel, and is 266 * stored on disk (by virtue of being incorporated into other on-disk 267 * structures, e.g. dsl_scan_phys_t). 268 */ 269typedef struct zbookmark_phys { 270 uint64_t zb_objset; 271 uint64_t zb_object; 272 int64_t zb_level; 273 uint64_t zb_blkid; 274} zbookmark_phys_t; 275 276#define SET_BOOKMARK(zb, objset, object, level, blkid) \ 277{ \ 278 (zb)->zb_objset = objset; \ 279 (zb)->zb_object = object; \ 280 (zb)->zb_level = level; \ 281 (zb)->zb_blkid = blkid; \ 282} 283 284#define ZB_DESTROYED_OBJSET (-1ULL) 285 286#define ZB_ROOT_OBJECT (0ULL) 287#define ZB_ROOT_LEVEL (-1LL) 288#define ZB_ROOT_BLKID (0ULL) 289 290#define ZB_ZIL_OBJECT (0ULL) 291#define ZB_ZIL_LEVEL (-2LL) 292 293#define ZB_IS_ZERO(zb) \ 294 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 295 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 296#define ZB_IS_ROOT(zb) \ 297 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 298 (zb)->zb_level == ZB_ROOT_LEVEL && \ 299 (zb)->zb_blkid == ZB_ROOT_BLKID) 300 301typedef struct zio_prop { 302 enum zio_checksum zp_checksum; 303 enum zio_compress zp_compress; 304 dmu_object_type_t zp_type; 305 uint8_t zp_level; 306 uint8_t zp_copies; 307 boolean_t zp_dedup; 308 boolean_t zp_dedup_verify; 309 boolean_t zp_nopwrite; 310} zio_prop_t; 311 312typedef struct zio_cksum_report zio_cksum_report_t; 313 314typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 315 const void *good_data); 316typedef void zio_cksum_free_f(void *cbdata, size_t size); 317 318struct zio_bad_cksum; /* defined in zio_checksum.h */ 319struct dnode_phys; 320 321struct zio_cksum_report { 322 struct zio_cksum_report *zcr_next; 323 nvlist_t *zcr_ereport; 324 nvlist_t *zcr_detector; 325 void *zcr_cbdata; 326 size_t zcr_cbinfo; /* passed to zcr_free() */ 327 uint64_t zcr_align; 328 uint64_t zcr_length; 329 zio_cksum_finish_f *zcr_finish; 330 zio_cksum_free_f *zcr_free; 331 332 /* internal use only */ 333 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 334}; 335 336typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 337 void *arg); 338 339zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 340 341typedef struct zio_vsd_ops { 342 zio_done_func_t *vsd_free; 343 zio_vsd_cksum_report_f *vsd_cksum_report; 344} zio_vsd_ops_t; 345 346typedef struct zio_gang_node { 347 zio_gbh_phys_t *gn_gbh; 348 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 349} zio_gang_node_t; 350 351typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 352 zio_gang_node_t *gn, void *data); 353 354typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 355 356typedef struct zio_transform { 357 void *zt_orig_data; 358 uint64_t zt_orig_size; 359 uint64_t zt_bufsize; 360 zio_transform_func_t *zt_transform; 361 struct zio_transform *zt_next; 362} zio_transform_t; 363 364typedef int zio_pipe_stage_t(zio_t **ziop); 365 366/* 367 * The io_reexecute flags are distinct from io_flags because the child must 368 * be able to propagate them to the parent. The normal io_flags are local 369 * to the zio, not protected by any lock, and not modifiable by children; 370 * the reexecute flags are protected by io_lock, modifiable by children, 371 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 372 */ 373#define ZIO_REEXECUTE_NOW 0x01 374#define ZIO_REEXECUTE_SUSPEND 0x02 375 376typedef struct zio_link { 377 zio_t *zl_parent; 378 zio_t *zl_child; 379 list_node_t zl_parent_node; 380 list_node_t zl_child_node; 381} zio_link_t; 382 383/* 384 * Used for TRIM kstat. 385 */ 386typedef struct zio_trim_stats { 387 /* 388 * Number of bytes successfully TRIMmed. 389 */ 390 kstat_named_t bytes; 391 392 /* 393 * Number of successful TRIM requests. 394 */ 395 kstat_named_t success; 396 397 /* 398 * Number of TRIM requests that failed because TRIM is not 399 * supported. 400 */ 401 kstat_named_t unsupported; 402 403 /* 404 * Number of TRIM requests that failed for other reasons. 405 */ 406 kstat_named_t failed; 407} zio_trim_stats_t; 408 409extern zio_trim_stats_t zio_trim_stats; 410 411#define ZIO_TRIM_STAT_INCR(stat, val) \ 412 atomic_add_64(&zio_trim_stats.stat.value.ui64, (val)); 413#define ZIO_TRIM_STAT_BUMP(stat) \ 414 ZIO_TRIM_STAT_INCR(stat, 1); 415 416struct zio { 417 /* Core information about this I/O */ 418 zbookmark_phys_t io_bookmark; 419 zio_prop_t io_prop; 420 zio_type_t io_type; 421 enum zio_child io_child_type; 422 int io_cmd; 423 zio_priority_t io_priority; 424 uint8_t io_reexecute; 425 uint8_t io_state[ZIO_WAIT_TYPES]; 426 uint64_t io_txg; 427 spa_t *io_spa; 428 blkptr_t *io_bp; 429 blkptr_t *io_bp_override; 430 blkptr_t io_bp_copy; 431 list_t io_parent_list; 432 list_t io_child_list; 433 zio_link_t *io_walk_link; 434 zio_t *io_logical; 435 zio_transform_t *io_transform_stack; 436 437 /* Callback info */ 438 zio_done_func_t *io_ready; 439 zio_done_func_t *io_physdone; 440 zio_done_func_t *io_done; 441 void *io_private; 442 int64_t io_prev_space_delta; /* DMU private */ 443 blkptr_t io_bp_orig; 444 445 /* Data represented by this I/O */ 446 void *io_data; 447 void *io_orig_data; 448 uint64_t io_size; 449 uint64_t io_orig_size; 450 451 /* Stuff for the vdev stack */ 452 vdev_t *io_vd; 453 void *io_vsd; 454 const zio_vsd_ops_t *io_vsd_ops; 455 456 uint64_t io_offset; 457 hrtime_t io_timestamp; 458 avl_node_t io_queue_node; 459 460 /* Internal pipeline state */ 461 enum zio_flag io_flags; 462 enum zio_stage io_stage; 463 enum zio_stage io_pipeline; 464 enum zio_flag io_orig_flags; 465 enum zio_stage io_orig_stage; 466 enum zio_stage io_orig_pipeline; 467 int io_error; 468 int io_child_error[ZIO_CHILD_TYPES]; 469 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 470 uint64_t io_child_count; 471 uint64_t io_phys_children; 472 uint64_t io_parent_count; 473 uint64_t *io_stall; 474 zio_t *io_gang_leader; 475 zio_gang_node_t *io_gang_tree; 476 void *io_executor; 477 void *io_waiter; 478 kmutex_t io_lock; 479 kcondvar_t io_cv; 480 481 /* FMA state */ 482 zio_cksum_report_t *io_cksum_report; 483 uint64_t io_ena; 484 485 /* Taskq dispatching state */ 486 taskq_ent_t io_tqent; 487 488 avl_node_t io_trim_node; 489 list_node_t io_trim_link; 490}; 491 492extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 493 zio_done_func_t *done, void *priv, enum zio_flag flags); 494 495extern zio_t *zio_root(spa_t *spa, 496 zio_done_func_t *done, void *priv, enum zio_flag flags); 497 498extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 499 uint64_t size, zio_done_func_t *done, void *priv, 500 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 501 502extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 503 void *data, uint64_t size, const zio_prop_t *zp, 504 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, 505 void *priv, 506 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 507 508extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 509 void *data, uint64_t size, zio_done_func_t *done, void *priv, 510 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 511 512extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 513 boolean_t nopwrite); 514 515extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 516 517extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 518 const blkptr_t *bp, 519 zio_done_func_t *done, void *priv, enum zio_flag flags); 520 521extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 522 uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv, 523 enum zio_flag flags); 524 525extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 526 uint64_t size, void *data, int checksum, 527 zio_done_func_t *done, void *priv, zio_priority_t priority, 528 enum zio_flag flags, boolean_t labels); 529 530extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 531 uint64_t size, void *data, int checksum, 532 zio_done_func_t *done, void *priv, zio_priority_t priority, 533 enum zio_flag flags, boolean_t labels); 534 535extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 536 const blkptr_t *bp, uint64_t size, enum zio_flag flags); 537 538extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 539 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 540extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 541extern void zio_flush(zio_t *zio, vdev_t *vd); 542extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset, 543 uint64_t size); 544extern void zio_shrink(zio_t *zio, uint64_t size); 545 546extern int zio_wait(zio_t *zio); 547extern void zio_nowait(zio_t *zio); 548extern void zio_execute(zio_t *zio); 549extern void zio_interrupt(zio_t *zio); 550 551extern zio_t *zio_walk_parents(zio_t *cio); 552extern zio_t *zio_walk_children(zio_t *pio); 553extern zio_t *zio_unique_parent(zio_t *cio); 554extern void zio_add_child(zio_t *pio, zio_t *cio); 555 556extern void *zio_buf_alloc(size_t size); 557extern void zio_buf_free(void *buf, size_t size); 558extern void *zio_data_buf_alloc(size_t size); 559extern void zio_data_buf_free(void *buf, size_t size); 560 561extern void zio_resubmit_stage_async(void *); 562 563extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 564 uint64_t offset, void *data, uint64_t size, int type, 565 zio_priority_t priority, enum zio_flag flags, 566 zio_done_func_t *done, void *priv); 567 568extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 569 void *data, uint64_t size, int type, zio_priority_t priority, 570 enum zio_flag flags, zio_done_func_t *done, void *priv); 571 572extern void zio_vdev_io_bypass(zio_t *zio); 573extern void zio_vdev_io_reissue(zio_t *zio); 574extern void zio_vdev_io_redone(zio_t *zio); 575 576extern void zio_checksum_verified(zio_t *zio); 577extern int zio_worst_error(int e1, int e2); 578 579extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 580 enum zio_checksum parent); 581extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 582 enum zio_checksum child, enum zio_checksum parent); 583extern enum zio_compress zio_compress_select(enum zio_compress child, 584 enum zio_compress parent); 585 586extern void zio_suspend(spa_t *spa, zio_t *zio); 587extern int zio_resume(spa_t *spa); 588extern void zio_resume_wait(spa_t *spa); 589 590/* 591 * Initial setup and teardown. 592 */ 593extern void zio_init(void); 594extern void zio_fini(void); 595 596/* 597 * Fault injection 598 */ 599struct zinject_record; 600extern uint32_t zio_injection_enabled; 601extern int zio_inject_fault(char *name, int flags, int *id, 602 struct zinject_record *record); 603extern int zio_inject_list_next(int *id, char *name, size_t buflen, 604 struct zinject_record *record); 605extern int zio_clear_fault(int id); 606extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 607extern int zio_handle_fault_injection(zio_t *zio, int error); 608extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 609extern int zio_handle_label_injection(zio_t *zio, int error); 610extern void zio_handle_ignored_writes(zio_t *zio); 611extern uint64_t zio_handle_io_delay(zio_t *zio); 612 613/* 614 * Checksum ereport functions 615 */ 616extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 617 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 618extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 619 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 620 621extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 622extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 623 624/* If we have the good data in hand, this function can be used */ 625extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 626 struct zio *zio, uint64_t offset, uint64_t length, 627 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 628 629/* Called from spa_sync(), but primarily an injection handler */ 630extern void spa_handle_ignored_writes(spa_t *spa); 631 632/* zbookmark_phys functions */ 633boolean_t zbookmark_is_before(const struct dnode_phys *dnp, 634 const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 635 636#ifdef __cplusplus 637} 638#endif 639 640#endif /* _ZIO_H */ 641