zio.h revision 320496
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, 2016 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/zio_priority.h> 33#include <sys/zfs_context.h> 34#include <sys/spa.h> 35#include <sys/txg.h> 36#include <sys/avl.h> 37#include <sys/kstat.h> 38#include <sys/fs/zfs.h> 39#include <sys/zio_impl.h> 40 41#ifdef __cplusplus 42extern "C" { 43#endif 44 45/* 46 * Embedded checksum 47 */ 48#define ZEC_MAGIC 0x210da7ab10c7a11ULL 49 50typedef struct zio_eck { 51 uint64_t zec_magic; /* for validation, endianness */ 52 zio_cksum_t zec_cksum; /* 256-bit checksum */ 53} zio_eck_t; 54 55/* 56 * Gang block headers are self-checksumming and contain an array 57 * of block pointers. 58 */ 59#define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE 60#define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ 61 sizeof (zio_eck_t)) / sizeof (blkptr_t)) 62#define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ 63 sizeof (zio_eck_t) - \ 64 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\ 65 sizeof (uint64_t)) 66 67typedef struct zio_gbh { 68 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; 69 uint64_t zg_filler[SPA_GBH_FILLER]; 70 zio_eck_t zg_tail; 71} zio_gbh_phys_t; 72 73enum zio_checksum { 74 ZIO_CHECKSUM_INHERIT = 0, 75 ZIO_CHECKSUM_ON, 76 ZIO_CHECKSUM_OFF, 77 ZIO_CHECKSUM_LABEL, 78 ZIO_CHECKSUM_GANG_HEADER, 79 ZIO_CHECKSUM_ZILOG, 80 ZIO_CHECKSUM_FLETCHER_2, 81 ZIO_CHECKSUM_FLETCHER_4, 82 ZIO_CHECKSUM_SHA256, 83 ZIO_CHECKSUM_ZILOG2, 84 ZIO_CHECKSUM_NOPARITY, 85#ifdef illumos 86 ZIO_CHECKSUM_SHA512, 87 ZIO_CHECKSUM_SKEIN, 88 ZIO_CHECKSUM_EDONR, 89#endif 90 ZIO_CHECKSUM_FUNCTIONS 91}; 92 93/* 94 * The number of "legacy" compression functions which can be set on individual 95 * objects. 96 */ 97#define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2 98 99#define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 100#define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 101 102#define ZIO_CHECKSUM_MASK 0xffULL 103#define ZIO_CHECKSUM_VERIFY (1 << 8) 104 105#define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 106#define ZIO_DEDUPDITTO_MIN 100 107 108enum zio_compress { 109 ZIO_COMPRESS_INHERIT = 0, 110 ZIO_COMPRESS_ON, 111 ZIO_COMPRESS_OFF, 112 ZIO_COMPRESS_LZJB, 113 ZIO_COMPRESS_EMPTY, 114 ZIO_COMPRESS_GZIP_1, 115 ZIO_COMPRESS_GZIP_2, 116 ZIO_COMPRESS_GZIP_3, 117 ZIO_COMPRESS_GZIP_4, 118 ZIO_COMPRESS_GZIP_5, 119 ZIO_COMPRESS_GZIP_6, 120 ZIO_COMPRESS_GZIP_7, 121 ZIO_COMPRESS_GZIP_8, 122 ZIO_COMPRESS_GZIP_9, 123 ZIO_COMPRESS_ZLE, 124 ZIO_COMPRESS_LZ4, 125 ZIO_COMPRESS_FUNCTIONS 126}; 127 128/* 129 * The number of "legacy" compression functions which can be set on individual 130 * objects. 131 */ 132#define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4 133 134/* 135 * The meaning of "compress = on" selected by the compression features enabled 136 * on a given pool. 137 */ 138#define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB 139#define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4 140 141#define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 142 143#define BOOTFS_COMPRESS_VALID(compress) \ 144 ((compress) == ZIO_COMPRESS_LZJB || \ 145 (compress) == ZIO_COMPRESS_LZ4 || \ 146 (compress) == ZIO_COMPRESS_ON || \ 147 (compress) == ZIO_COMPRESS_OFF) 148 149#define ZIO_FAILURE_MODE_WAIT 0 150#define ZIO_FAILURE_MODE_CONTINUE 1 151#define ZIO_FAILURE_MODE_PANIC 2 152 153enum zio_flag { 154 /* 155 * Flags inherited by gang, ddt, and vdev children, 156 * and that must be equal for two zios to aggregate 157 */ 158 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 159 ZIO_FLAG_IO_REPAIR = 1 << 1, 160 ZIO_FLAG_SELF_HEAL = 1 << 2, 161 ZIO_FLAG_RESILVER = 1 << 3, 162 ZIO_FLAG_SCRUB = 1 << 4, 163 ZIO_FLAG_SCAN_THREAD = 1 << 5, 164 ZIO_FLAG_PHYSICAL = 1 << 6, 165 166#define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 167 168 /* 169 * Flags inherited by ddt, gang, and vdev children. 170 */ 171 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 172 ZIO_FLAG_SPECULATIVE = 1 << 8, 173 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 174 ZIO_FLAG_DONT_RETRY = 1 << 10, 175 ZIO_FLAG_DONT_CACHE = 1 << 11, 176 ZIO_FLAG_NODATA = 1 << 12, 177 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 178 ZIO_FLAG_IO_ALLOCATING = 1 << 14, 179 180#define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 181#define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 182 183 /* 184 * Flags inherited by vdev children. 185 */ 186 ZIO_FLAG_IO_RETRY = 1 << 15, /* must be first for INHERIT */ 187 ZIO_FLAG_PROBE = 1 << 16, 188 ZIO_FLAG_TRYHARD = 1 << 17, 189 ZIO_FLAG_OPTIONAL = 1 << 18, 190 191#define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 192 193 /* 194 * Flags not inherited by any children. 195 */ 196 ZIO_FLAG_DONT_QUEUE = 1 << 19, /* must be first for INHERIT */ 197 ZIO_FLAG_DONT_PROPAGATE = 1 << 20, 198 ZIO_FLAG_IO_BYPASS = 1 << 21, 199 ZIO_FLAG_IO_REWRITE = 1 << 22, 200 ZIO_FLAG_RAW = 1 << 23, 201 ZIO_FLAG_GANG_CHILD = 1 << 24, 202 ZIO_FLAG_DDT_CHILD = 1 << 25, 203 ZIO_FLAG_GODFATHER = 1 << 26, 204 ZIO_FLAG_NOPWRITE = 1 << 27, 205 ZIO_FLAG_REEXECUTED = 1 << 28, 206 ZIO_FLAG_DELEGATED = 1 << 29, 207}; 208 209#define ZIO_FLAG_MUSTSUCCEED 0 210 211#define ZIO_DDT_CHILD_FLAGS(zio) \ 212 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 213 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 214 215#define ZIO_GANG_CHILD_FLAGS(zio) \ 216 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 217 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 218 219#define ZIO_VDEV_CHILD_FLAGS(zio) \ 220 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 221 ZIO_FLAG_CANFAIL) 222 223enum zio_child { 224 ZIO_CHILD_VDEV = 0, 225 ZIO_CHILD_GANG, 226 ZIO_CHILD_DDT, 227 ZIO_CHILD_LOGICAL, 228 ZIO_CHILD_TYPES 229}; 230 231enum zio_wait_type { 232 ZIO_WAIT_READY = 0, 233 ZIO_WAIT_DONE, 234 ZIO_WAIT_TYPES 235}; 236 237/* 238 * We'll take the number 122 and 123 to indicate checksum errors and 239 * fragmentation. Those doesn't collide with any errno values as they 240 * are greater than ELAST. 241 */ 242#define ECKSUM 122 243#define EFRAGS 123 244 245typedef void zio_done_func_t(zio_t *zio); 246 247extern boolean_t zio_dva_throttle_enabled; 248extern const char *zio_type_name[ZIO_TYPES]; 249 250/* 251 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 252 * identifies any block in the pool. By convention, the meta-objset (MOS) 253 * is objset 0, and the meta-dnode is object 0. This covers all blocks 254 * except root blocks and ZIL blocks, which are defined as follows: 255 * 256 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 257 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 258 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 259 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>. 260 * 261 * Note: this structure is called a bookmark because its original purpose 262 * was to remember where to resume a pool-wide traverse. 263 * 264 * Note: this structure is passed between userland and the kernel, and is 265 * stored on disk (by virtue of being incorporated into other on-disk 266 * structures, e.g. dsl_scan_phys_t). 267 */ 268typedef struct zbookmark_phys { 269 uint64_t zb_objset; 270 uint64_t zb_object; 271 int64_t zb_level; 272 uint64_t zb_blkid; 273} zbookmark_phys_t; 274 275#define SET_BOOKMARK(zb, objset, object, level, blkid) \ 276{ \ 277 (zb)->zb_objset = objset; \ 278 (zb)->zb_object = object; \ 279 (zb)->zb_level = level; \ 280 (zb)->zb_blkid = blkid; \ 281} 282 283#define ZB_DESTROYED_OBJSET (-1ULL) 284 285#define ZB_ROOT_OBJECT (0ULL) 286#define ZB_ROOT_LEVEL (-1LL) 287#define ZB_ROOT_BLKID (0ULL) 288 289#define ZB_ZIL_OBJECT (0ULL) 290#define ZB_ZIL_LEVEL (-2LL) 291 292#define ZB_DNODE_LEVEL (-3LL) 293#define ZB_DNODE_BLKID (0ULL) 294 295#define ZB_IS_ZERO(zb) \ 296 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 297 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 298#define ZB_IS_ROOT(zb) \ 299 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 300 (zb)->zb_level == ZB_ROOT_LEVEL && \ 301 (zb)->zb_blkid == ZB_ROOT_BLKID) 302 303typedef struct zio_prop { 304 enum zio_checksum zp_checksum; 305 enum zio_compress zp_compress; 306 dmu_object_type_t zp_type; 307 uint8_t zp_level; 308 uint8_t zp_copies; 309 boolean_t zp_dedup; 310 boolean_t zp_dedup_verify; 311 boolean_t zp_nopwrite; 312} zio_prop_t; 313 314typedef struct zio_cksum_report zio_cksum_report_t; 315 316typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 317 const void *good_data); 318typedef void zio_cksum_free_f(void *cbdata, size_t size); 319 320struct zio_bad_cksum; /* defined in zio_checksum.h */ 321struct dnode_phys; 322 323struct zio_cksum_report { 324 struct zio_cksum_report *zcr_next; 325 nvlist_t *zcr_ereport; 326 nvlist_t *zcr_detector; 327 void *zcr_cbdata; 328 size_t zcr_cbinfo; /* passed to zcr_free() */ 329 uint64_t zcr_align; 330 uint64_t zcr_length; 331 zio_cksum_finish_f *zcr_finish; 332 zio_cksum_free_f *zcr_free; 333 334 /* internal use only */ 335 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 336}; 337 338typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 339 void *arg); 340 341zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 342 343typedef struct zio_vsd_ops { 344 zio_done_func_t *vsd_free; 345 zio_vsd_cksum_report_f *vsd_cksum_report; 346} zio_vsd_ops_t; 347 348typedef struct zio_gang_node { 349 zio_gbh_phys_t *gn_gbh; 350 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 351} zio_gang_node_t; 352 353typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 354 zio_gang_node_t *gn, void *data); 355 356typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 357 358typedef struct zio_transform { 359 void *zt_orig_data; 360 uint64_t zt_orig_size; 361 uint64_t zt_bufsize; 362 zio_transform_func_t *zt_transform; 363 struct zio_transform *zt_next; 364} zio_transform_t; 365 366typedef int zio_pipe_stage_t(zio_t *zio); 367 368/* 369 * The io_reexecute flags are distinct from io_flags because the child must 370 * be able to propagate them to the parent. The normal io_flags are local 371 * to the zio, not protected by any lock, and not modifiable by children; 372 * the reexecute flags are protected by io_lock, modifiable by children, 373 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 374 */ 375#define ZIO_REEXECUTE_NOW 0x01 376#define ZIO_REEXECUTE_SUSPEND 0x02 377 378typedef 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/* 386 * Used for TRIM kstat. 387 */ 388typedef struct zio_trim_stats { 389 /* 390 * Number of bytes successfully TRIMmed. 391 */ 392 kstat_named_t bytes; 393 394 /* 395 * Number of successful TRIM requests. 396 */ 397 kstat_named_t success; 398 399 /* 400 * Number of TRIM requests that failed because TRIM is not 401 * supported. 402 */ 403 kstat_named_t unsupported; 404 405 /* 406 * Number of TRIM requests that failed for other reasons. 407 */ 408 kstat_named_t failed; 409} zio_trim_stats_t; 410 411extern zio_trim_stats_t zio_trim_stats; 412 413#define ZIO_TRIM_STAT_INCR(stat, val) \ 414 atomic_add_64(&zio_trim_stats.stat.value.ui64, (val)); 415#define ZIO_TRIM_STAT_BUMP(stat) \ 416 ZIO_TRIM_STAT_INCR(stat, 1); 417 418struct zio { 419 /* Core information about this I/O */ 420 zbookmark_phys_t io_bookmark; 421 zio_prop_t io_prop; 422 zio_type_t io_type; 423 enum zio_child io_child_type; 424 int io_cmd; 425 zio_priority_t io_priority; 426 uint8_t io_reexecute; 427 uint8_t io_state[ZIO_WAIT_TYPES]; 428 uint64_t io_txg; 429 spa_t *io_spa; 430 blkptr_t *io_bp; 431 blkptr_t *io_bp_override; 432 blkptr_t io_bp_copy; 433 list_t io_parent_list; 434 list_t io_child_list; 435 zio_t *io_logical; 436 zio_transform_t *io_transform_stack; 437 438 /* Callback info */ 439 zio_done_func_t *io_ready; 440 zio_done_func_t *io_children_ready; 441 zio_done_func_t *io_physdone; 442 zio_done_func_t *io_done; 443 void *io_private; 444 int64_t io_prev_space_delta; /* DMU private */ 445 blkptr_t io_bp_orig; 446 447 /* Data represented by this I/O */ 448 void *io_data; 449 void *io_orig_data; 450 uint64_t io_size; 451 uint64_t io_orig_size; 452 453 /* Stuff for the vdev stack */ 454 vdev_t *io_vd; 455 void *io_vsd; 456 const zio_vsd_ops_t *io_vsd_ops; 457 458 uint64_t io_offset; 459 hrtime_t io_timestamp; 460 hrtime_t io_queued_timestamp; 461 hrtime_t io_target_timestamp; 462 avl_node_t io_queue_node; 463 avl_node_t io_offset_node; 464 avl_node_t io_alloc_node; 465 466 /* Internal pipeline state */ 467 enum zio_flag io_flags; 468 enum zio_stage io_stage; 469 enum zio_stage io_pipeline; 470 enum zio_flag io_orig_flags; 471 enum zio_stage io_orig_stage; 472 enum zio_stage io_orig_pipeline; 473 enum zio_stage io_pipeline_trace; 474 int io_error; 475 int io_child_error[ZIO_CHILD_TYPES]; 476 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 477 uint64_t io_child_count; 478 uint64_t io_phys_children; 479 uint64_t io_parent_count; 480 uint64_t *io_stall; 481 zio_t *io_gang_leader; 482 zio_gang_node_t *io_gang_tree; 483 void *io_executor; 484 void *io_waiter; 485 kmutex_t io_lock; 486 kcondvar_t io_cv; 487 488 /* FMA state */ 489 zio_cksum_report_t *io_cksum_report; 490 uint64_t io_ena; 491 492 /* Taskq dispatching state */ 493 taskq_ent_t io_tqent; 494 495 avl_node_t io_trim_node; 496 list_node_t io_trim_link; 497}; 498 499extern int zio_timestamp_compare(const void *, const void *); 500 501extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 502 zio_done_func_t *done, void *priv, enum zio_flag flags); 503 504extern zio_t *zio_root(spa_t *spa, 505 zio_done_func_t *done, void *priv, enum zio_flag flags); 506 507extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 508 uint64_t size, zio_done_func_t *done, void *priv, 509 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 510 511extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 512 void *data, uint64_t size, const zio_prop_t *zp, 513 zio_done_func_t *ready, zio_done_func_t *children_ready, 514 zio_done_func_t *physdone, zio_done_func_t *done, 515 void *priv, zio_priority_t priority, enum zio_flag flags, 516 const zbookmark_phys_t *zb); 517 518extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 519 void *data, uint64_t size, zio_done_func_t *done, void *priv, 520 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 521 522extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 523 boolean_t nopwrite); 524 525extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 526 527extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 528 const blkptr_t *bp, 529 zio_done_func_t *done, void *priv, enum zio_flag flags); 530 531extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 532 uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv, 533 zio_priority_t priority, enum zio_flag flags); 534 535extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 536 uint64_t size, void *data, int checksum, 537 zio_done_func_t *done, void *priv, zio_priority_t priority, 538 enum zio_flag flags, boolean_t labels); 539 540extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 541 uint64_t size, void *data, int checksum, 542 zio_done_func_t *done, void *priv, zio_priority_t priority, 543 enum zio_flag flags, boolean_t labels); 544 545extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 546 const blkptr_t *bp, uint64_t size, enum zio_flag flags); 547 548extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 549 blkptr_t *old_bp, uint64_t size, boolean_t *slog); 550extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 551extern void zio_flush(zio_t *zio, vdev_t *vd); 552extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset, 553 uint64_t size); 554extern void zio_shrink(zio_t *zio, uint64_t size); 555 556extern int zio_wait(zio_t *zio); 557extern void zio_nowait(zio_t *zio); 558extern void zio_execute(zio_t *zio); 559extern void zio_interrupt(zio_t *zio); 560extern void zio_delay_init(zio_t *zio); 561extern void zio_delay_interrupt(zio_t *zio); 562 563extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **); 564extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **); 565extern zio_t *zio_unique_parent(zio_t *cio); 566extern void zio_add_child(zio_t *pio, zio_t *cio); 567 568extern void *zio_buf_alloc(size_t size); 569extern void *zio_buf_alloc_nowait(size_t size); 570extern void zio_buf_free(void *buf, size_t size); 571extern void *zio_data_buf_alloc(size_t size); 572extern void zio_data_buf_free(void *buf, size_t size); 573 574extern void zio_push_transform(zio_t *zio, void *data, uint64_t size, 575 uint64_t bufsize, zio_transform_func_t *transform); 576extern void zio_pop_transforms(zio_t *zio); 577 578extern void zio_resubmit_stage_async(void *); 579 580extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 581 uint64_t offset, void *data, uint64_t size, int type, 582 zio_priority_t priority, enum zio_flag flags, 583 zio_done_func_t *done, void *priv); 584 585extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 586 void *data, uint64_t size, int type, zio_priority_t priority, 587 enum zio_flag flags, zio_done_func_t *done, void *priv); 588 589extern void zio_vdev_io_bypass(zio_t *zio); 590extern void zio_vdev_io_reissue(zio_t *zio); 591extern void zio_vdev_io_redone(zio_t *zio); 592 593extern void zio_checksum_verified(zio_t *zio); 594extern int zio_worst_error(int e1, int e2); 595 596extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 597 enum zio_checksum parent); 598extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 599 enum zio_checksum child, enum zio_checksum parent); 600extern enum zio_compress zio_compress_select(spa_t *spa, 601 enum zio_compress child, enum zio_compress parent); 602 603extern void zio_suspend(spa_t *spa, zio_t *zio); 604extern int zio_resume(spa_t *spa); 605extern void zio_resume_wait(spa_t *spa); 606 607/* 608 * Initial setup and teardown. 609 */ 610extern void zio_init(void); 611extern void zio_fini(void); 612 613/* 614 * Fault injection 615 */ 616struct zinject_record; 617extern uint32_t zio_injection_enabled; 618extern int zio_inject_fault(char *name, int flags, int *id, 619 struct zinject_record *record); 620extern int zio_inject_list_next(int *id, char *name, size_t buflen, 621 struct zinject_record *record); 622extern int zio_clear_fault(int id); 623extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 624extern int zio_handle_fault_injection(zio_t *zio, int error); 625extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 626extern int zio_handle_label_injection(zio_t *zio, int error); 627extern void zio_handle_ignored_writes(zio_t *zio); 628extern hrtime_t zio_handle_io_delay(zio_t *zio); 629 630/* 631 * Checksum ereport functions 632 */ 633extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 634 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 635extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 636 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 637 638extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 639extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 640 641/* If we have the good data in hand, this function can be used */ 642extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 643 struct zio *zio, uint64_t offset, uint64_t length, 644 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 645 646/* Called from spa_sync(), but primarily an injection handler */ 647extern void spa_handle_ignored_writes(spa_t *spa); 648 649/* zbookmark_phys functions */ 650boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp, 651 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block); 652int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, 653 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 654 655#ifdef __cplusplus 656} 657#endif 658 659#endif /* _ZIO_H */ 660