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