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 * Copyright (c) 2013, Joyent, Inc. All rights reserved. 28 */ 29 30 #ifndef _ZIO_H 31 #define _ZIO_H 32 33 #include <sys/zfs_context.h> 34 #include <sys/spa.h> 35 #include <sys/txg.h> 36 #include <sys/avl.h> 37 #include <sys/fs/zfs.h> 38 #include <sys/zio_impl.h> 39 40 #ifdef __cplusplus 41 extern "C" { 42 #endif 43 44 /* 45 * Embedded checksum 46 */ 47 #define ZEC_MAGIC 0x210da7ab10c7a11ULL 48 49 typedef 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 66 typedef 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 72 enum 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 100 101 102 enum 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 2 142 143 typedef 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 enum zio_flag { 155 /* 156 * Flags inherited by gang, ddt, and vdev children, 157 * and that must be equal for two zios to aggregate 158 */ 159 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 160 ZIO_FLAG_IO_REPAIR = 1 << 1, 161 ZIO_FLAG_SELF_HEAL = 1 << 2, 162 ZIO_FLAG_RESILVER = 1 << 3, 163 ZIO_FLAG_SCRUB = 1 << 4, 164 ZIO_FLAG_SCAN_THREAD = 1 << 5, 165 ZIO_FLAG_PHYSICAL = 1 << 6, 166 167 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 168 169 /* 170 * Flags inherited by ddt, gang, and vdev children. 171 */ 172 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 173 ZIO_FLAG_SPECULATIVE = 1 << 8, 174 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 175 ZIO_FLAG_DONT_RETRY = 1 << 10, 176 ZIO_FLAG_DONT_CACHE = 1 << 11, 177 ZIO_FLAG_NODATA = 1 << 12, 178 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 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 << 14, /* must be first for INHERIT */ 187 ZIO_FLAG_PROBE = 1 << 15, 188 ZIO_FLAG_TRYHARD = 1 << 16, 189 ZIO_FLAG_OPTIONAL = 1 << 17, 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 << 18, /* must be first for INHERIT */ 197 ZIO_FLAG_DONT_PROPAGATE = 1 << 19, 198 ZIO_FLAG_IO_BYPASS = 1 << 20, 199 ZIO_FLAG_IO_REWRITE = 1 << 21, 200 ZIO_FLAG_RAW = 1 << 22, 201 ZIO_FLAG_GANG_CHILD = 1 << 23, 202 ZIO_FLAG_DDT_CHILD = 1 << 24, 203 ZIO_FLAG_GODFATHER = 1 << 25, 204 ZIO_FLAG_NOPWRITE = 1 << 26, 205 ZIO_FLAG_REEXECUTED = 1 << 27, 206 ZIO_FLAG_DELEGATED = 1 << 28, 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) 222 223 enum zio_child { 224 ZIO_CHILD_VDEV = 0, 225 ZIO_CHILD_GANG, 226 ZIO_CHILD_DDT, 227 ZIO_CHILD_LOGICAL, 228 ZIO_CHILD_TYPES 229 }; 230 231 enum zio_wait_type { 232 ZIO_WAIT_READY = 0, 233 ZIO_WAIT_DONE, 234 ZIO_WAIT_TYPES 235 }; 236 237 /* 238 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 239 * graveyard) to indicate checksum errors and fragmentation. 240 */ 241 #define ECKSUM EBADE 242 #define EFRAGS EBADR 243 244 typedef void zio_done_func_t(zio_t *zio); 245 246 extern const char *zio_type_name[ZIO_TYPES]; 247 248 /* 249 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 250 * identifies any block in the pool. By convention, the meta-objset (MOS) 251 * is objset 0, and the meta-dnode is object 0. This covers all blocks 252 * except root blocks and ZIL blocks, which are defined as follows: 253 * 254 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 255 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 256 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 257 * 258 * Note: this structure is called a bookmark because its original purpose 259 * was to remember where to resume a pool-wide traverse. 260 * 261 * Note: this structure is passed between userland and the kernel, and is 262 * stored on disk (by virtue of being incorporated into other on-disk 263 * structures, e.g. dsl_scan_phys_t). 264 */ 265 typedef struct zbookmark_phys { 266 uint64_t zb_objset; 267 uint64_t zb_object; 268 int64_t zb_level; 269 uint64_t zb_blkid; 270 } zbookmark_phys_t; 271 272 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 273 { \ 274 (zb)->zb_objset = objset; \ 275 (zb)->zb_object = object; \ 276 (zb)->zb_level = level; \ 277 (zb)->zb_blkid = blkid; \ 278 } 279 280 #define ZB_DESTROYED_OBJSET (-1ULL) 281 282 #define ZB_ROOT_OBJECT (0ULL) 283 #define ZB_ROOT_LEVEL (-1LL) 284 #define ZB_ROOT_BLKID (0ULL) 285 286 #define ZB_ZIL_OBJECT (0ULL) 287 #define ZB_ZIL_LEVEL (-2LL) 288 289 #define ZB_IS_ZERO(zb) \ 290 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 291 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 292 #define ZB_IS_ROOT(zb) \ 293 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 294 (zb)->zb_level == ZB_ROOT_LEVEL && \ 295 (zb)->zb_blkid == ZB_ROOT_BLKID) 296 297 typedef struct zio_prop { 298 enum zio_checksum zp_checksum; 299 enum zio_compress zp_compress; 300 dmu_object_type_t zp_type; 301 uint8_t zp_level; 302 uint8_t zp_copies; 303 boolean_t zp_dedup; 304 boolean_t zp_dedup_verify; 305 boolean_t zp_nopwrite; 306 } zio_prop_t; 307 308 typedef struct zio_cksum_report zio_cksum_report_t; 309 310 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 311 const void *good_data); 312 typedef void zio_cksum_free_f(void *cbdata, size_t size); 313 314 struct zio_bad_cksum; /* defined in zio_checksum.h */ 315 struct dnode_phys; 316 317 struct zio_cksum_report { 318 struct zio_cksum_report *zcr_next; 319 nvlist_t *zcr_ereport; 320 nvlist_t *zcr_detector; 321 void *zcr_cbdata; 322 size_t zcr_cbinfo; /* passed to zcr_free() */ 323 uint64_t zcr_align; 324 uint64_t zcr_length; 325 zio_cksum_finish_f *zcr_finish; 326 zio_cksum_free_f *zcr_free; 327 328 /* internal use only */ 329 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 330 }; 331 332 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 333 void *arg); 334 335 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 336 337 typedef struct zio_vsd_ops { 338 zio_done_func_t *vsd_free; 339 zio_vsd_cksum_report_f *vsd_cksum_report; 340 } zio_vsd_ops_t; 341 342 typedef struct zio_gang_node { 343 zio_gbh_phys_t *gn_gbh; 344 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 345 } zio_gang_node_t; 346 347 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 348 zio_gang_node_t *gn, void *data); 349 350 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 351 352 typedef struct zio_transform { 353 void *zt_orig_data; 354 uint64_t zt_orig_size; 355 uint64_t zt_bufsize; 356 zio_transform_func_t *zt_transform; 357 struct zio_transform *zt_next; 358 } zio_transform_t; 359 360 typedef int zio_pipe_stage_t(zio_t *zio); 361 362 /* 363 * The io_reexecute flags are distinct from io_flags because the child must 364 * be able to propagate them to the parent. The normal io_flags are local 365 * to the zio, not protected by any lock, and not modifiable by children; 366 * the reexecute flags are protected by io_lock, modifiable by children, 367 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 368 */ 369 #define ZIO_REEXECUTE_NOW 0x01 370 #define ZIO_REEXECUTE_SUSPEND 0x02 371 372 typedef struct zio_link { 373 zio_t *zl_parent; 374 zio_t *zl_child; 375 list_node_t zl_parent_node; 376 list_node_t zl_child_node; 377 } zio_link_t; 378 379 struct zio { 380 /* Core information about this I/O */ 381 zbookmark_phys_t io_bookmark; 382 zio_prop_t io_prop; 383 zio_type_t io_type; 384 enum zio_child io_child_type; 385 int io_cmd; 386 zio_priority_t io_priority; 387 uint8_t io_reexecute; 388 uint8_t io_state[ZIO_WAIT_TYPES]; 389 uint64_t io_txg; 390 spa_t *io_spa; 391 blkptr_t *io_bp; 392 blkptr_t *io_bp_override; 393 blkptr_t io_bp_copy; 394 list_t io_parent_list; 395 list_t io_child_list; 396 zio_link_t *io_walk_link; 397 zio_t *io_logical; 398 zio_transform_t *io_transform_stack; 399 400 /* Callback info */ 401 zio_done_func_t *io_ready; 402 zio_done_func_t *io_physdone; 403 zio_done_func_t *io_done; 404 void *io_private; 405 int64_t io_prev_space_delta; /* DMU private */ 406 blkptr_t io_bp_orig; 407 408 /* Data represented by this I/O */ 409 void *io_data; 410 void *io_orig_data; 411 uint64_t io_size; 412 uint64_t io_orig_size; 413 414 /* Stuff for the vdev stack */ 415 vdev_t *io_vd; 416 void *io_vsd; 417 const zio_vsd_ops_t *io_vsd_ops; 418 419 uint64_t io_offset; 420 hrtime_t io_timestamp; 421 avl_node_t io_queue_node; 422 avl_node_t io_offset_node; 423 424 /* Internal pipeline state */ 425 enum zio_flag io_flags; 426 enum zio_stage io_stage; 427 enum zio_stage io_pipeline; 428 enum zio_flag io_orig_flags; 429 enum zio_stage io_orig_stage; 430 enum zio_stage io_orig_pipeline; 431 int io_error; 432 int io_child_error[ZIO_CHILD_TYPES]; 433 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 434 uint64_t io_child_count; 435 uint64_t io_phys_children; 436 uint64_t io_parent_count; 437 uint64_t *io_stall; 438 zio_t *io_gang_leader; 439 zio_gang_node_t *io_gang_tree; 440 void *io_executor; 441 void *io_waiter; 442 kmutex_t io_lock; 443 kcondvar_t io_cv; 444 445 /* FMA state */ 446 zio_cksum_report_t *io_cksum_report; 447 uint64_t io_ena; 448 449 /* Taskq dispatching state */ 450 taskq_ent_t io_tqent; 451 }; 452 453 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 454 zio_done_func_t *done, void *private, enum zio_flag flags); 455 456 extern zio_t *zio_root(spa_t *spa, 457 zio_done_func_t *done, void *private, enum zio_flag flags); 458 459 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 460 uint64_t size, zio_done_func_t *done, void *private, 461 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 462 463 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 464 void *data, uint64_t size, const zio_prop_t *zp, 465 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, 466 void *private, 467 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 468 469 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 470 void *data, uint64_t size, zio_done_func_t *done, void *private, 471 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 472 473 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 474 boolean_t nopwrite); 475 476 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 477 478 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 479 const blkptr_t *bp, 480 zio_done_func_t *done, void *private, enum zio_flag flags); 481 482 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 483 zio_done_func_t *done, void *private, enum zio_flag flags); 484 485 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 486 uint64_t size, void *data, int checksum, 487 zio_done_func_t *done, void *private, zio_priority_t priority, 488 enum zio_flag flags, boolean_t labels); 489 490 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 491 uint64_t size, void *data, int checksum, 492 zio_done_func_t *done, void *private, zio_priority_t priority, 493 enum zio_flag flags, boolean_t labels); 494 495 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 496 const blkptr_t *bp, enum zio_flag flags); 497 498 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 499 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 500 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 501 extern void zio_flush(zio_t *zio, vdev_t *vd); 502 extern void zio_shrink(zio_t *zio, uint64_t size); 503 504 extern int zio_wait(zio_t *zio); 505 extern void zio_nowait(zio_t *zio); 506 extern void zio_execute(zio_t *zio); 507 extern void zio_interrupt(zio_t *zio); 508 509 extern zio_t *zio_walk_parents(zio_t *cio); 510 extern zio_t *zio_walk_children(zio_t *pio); 511 extern zio_t *zio_unique_parent(zio_t *cio); 512 extern void zio_add_child(zio_t *pio, zio_t *cio); 513 514 extern void *zio_buf_alloc(size_t size); 515 extern void zio_buf_free(void *buf, size_t size); 516 extern void *zio_data_buf_alloc(size_t size); 517 extern void zio_data_buf_free(void *buf, size_t size); 518 519 extern void zio_resubmit_stage_async(void *); 520 521 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 522 uint64_t offset, void *data, uint64_t size, int type, 523 zio_priority_t priority, enum zio_flag flags, 524 zio_done_func_t *done, void *private); 525 526 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 527 void *data, uint64_t size, int type, zio_priority_t priority, 528 enum zio_flag flags, zio_done_func_t *done, void *private); 529 530 extern void zio_vdev_io_bypass(zio_t *zio); 531 extern void zio_vdev_io_reissue(zio_t *zio); 532 extern void zio_vdev_io_redone(zio_t *zio); 533 534 extern void zio_checksum_verified(zio_t *zio); 535 extern int zio_worst_error(int e1, int e2); 536 537 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 538 enum zio_checksum parent); 539 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 540 enum zio_checksum child, enum zio_checksum parent); 541 extern enum zio_compress zio_compress_select(enum zio_compress child, 542 enum zio_compress parent); 543 544 extern void zio_suspend(spa_t *spa, zio_t *zio); 545 extern int zio_resume(spa_t *spa); 546 extern void zio_resume_wait(spa_t *spa); 547 548 /* 549 * Initial setup and teardown. 550 */ 551 extern void zio_init(void); 552 extern void zio_fini(void); 553 554 /* 555 * Fault injection 556 */ 557 struct zinject_record; 558 extern uint32_t zio_injection_enabled; 559 extern int zio_inject_fault(char *name, int flags, int *id, 560 struct zinject_record *record); 561 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 562 struct zinject_record *record); 563 extern int zio_clear_fault(int id); 564 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 565 extern int zio_handle_fault_injection(zio_t *zio, int error); 566 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 567 extern int zio_handle_label_injection(zio_t *zio, int error); 568 extern void zio_handle_ignored_writes(zio_t *zio); 569 extern uint64_t zio_handle_io_delay(zio_t *zio); 570 571 /* 572 * Checksum ereport functions 573 */ 574 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 575 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 576 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 577 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 578 579 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 580 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 581 582 /* If we have the good data in hand, this function can be used */ 583 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 584 struct zio *zio, uint64_t offset, uint64_t length, 585 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 586 587 /* Called from spa_sync(), but primarily an injection handler */ 588 extern void spa_handle_ignored_writes(spa_t *spa); 589 590 /* zbookmark_phys functions */ 591 boolean_t zbookmark_is_before(const struct dnode_phys *dnp, 592 const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 593 594 #ifdef __cplusplus 595 } 596 #endif 597 598 #endif /* _ZIO_H */ 599