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) 2013 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 #define ZIO_PIPELINE_CONTINUE 0x100 155 #define ZIO_PIPELINE_STOP 0x101 156 157 enum 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, 168 169 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 170 171 /* 172 * Flags inherited by ddt, gang, and vdev children. 173 */ 174 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */ 175 ZIO_FLAG_SPECULATIVE = 1 << 7, 176 ZIO_FLAG_CONFIG_WRITER = 1 << 8, 177 ZIO_FLAG_DONT_RETRY = 1 << 9, 178 ZIO_FLAG_DONT_CACHE = 1 << 10, 179 ZIO_FLAG_NODATA = 1 << 11, 180 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12, 181 182 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 183 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 184 185 /* 186 * Flags inherited by vdev children. 187 */ 188 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */ 189 ZIO_FLAG_PROBE = 1 << 14, 190 ZIO_FLAG_TRYHARD = 1 << 15, 191 ZIO_FLAG_OPTIONAL = 1 << 16, 192 193 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 194 195 /* 196 * Flags not inherited by any children. 197 */ 198 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */ 199 ZIO_FLAG_DONT_PROPAGATE = 1 << 18, 200 ZIO_FLAG_IO_BYPASS = 1 << 19, 201 ZIO_FLAG_IO_REWRITE = 1 << 20, 202 ZIO_FLAG_RAW = 1 << 21, 203 ZIO_FLAG_GANG_CHILD = 1 << 22, 204 ZIO_FLAG_DDT_CHILD = 1 << 23, 205 ZIO_FLAG_GODFATHER = 1 << 24, 206 ZIO_FLAG_NOPWRITE = 1 << 25, 207 ZIO_FLAG_REEXECUTED = 1 << 26, 208 ZIO_FLAG_DELEGATED = 1 << 27, 209 }; 210 211 #define ZIO_FLAG_MUSTSUCCEED 0 212 213 #define ZIO_DDT_CHILD_FLAGS(zio) \ 214 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 215 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 216 217 #define ZIO_GANG_CHILD_FLAGS(zio) \ 218 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 219 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 220 221 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 222 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 223 ZIO_FLAG_CANFAIL) 224 225 enum zio_child { 226 ZIO_CHILD_VDEV = 0, 227 ZIO_CHILD_GANG, 228 ZIO_CHILD_DDT, 229 ZIO_CHILD_LOGICAL, 230 ZIO_CHILD_TYPES 231 }; 232 233 enum zio_wait_type { 234 ZIO_WAIT_READY = 0, 235 ZIO_WAIT_DONE, 236 ZIO_WAIT_TYPES 237 }; 238 239 /* 240 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 241 * graveyard) to indicate checksum errors and fragmentation. 242 */ 243 #define ECKSUM EBADE 244 #define EFRAGS EBADR 245 246 typedef void zio_done_func_t(zio_t *zio); 247 248 extern 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 * 260 * Note: this structure is called a bookmark because its original purpose 261 * was to remember where to resume a pool-wide traverse. 262 * 263 * Note: this structure is passed between userland and the kernel. 264 * Therefore it must not change size or alignment between 32/64 bit 265 * compilation options. 266 */ 267 typedef struct zbookmark { 268 uint64_t zb_objset; 269 uint64_t zb_object; 270 int64_t zb_level; 271 uint64_t zb_blkid; 272 } zbookmark_t; 273 274 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 275 { \ 276 (zb)->zb_objset = objset; \ 277 (zb)->zb_object = object; \ 278 (zb)->zb_level = level; \ 279 (zb)->zb_blkid = blkid; \ 280 } 281 282 #define ZB_DESTROYED_OBJSET (-1ULL) 283 284 #define ZB_ROOT_OBJECT (0ULL) 285 #define ZB_ROOT_LEVEL (-1LL) 286 #define ZB_ROOT_BLKID (0ULL) 287 288 #define ZB_ZIL_OBJECT (0ULL) 289 #define ZB_ZIL_LEVEL (-2LL) 290 291 #define ZB_IS_ZERO(zb) \ 292 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 293 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 294 #define ZB_IS_ROOT(zb) \ 295 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 296 (zb)->zb_level == ZB_ROOT_LEVEL && \ 297 (zb)->zb_blkid == ZB_ROOT_BLKID) 298 299 typedef struct zio_prop { 300 enum zio_checksum zp_checksum; 301 enum zio_compress zp_compress; 302 dmu_object_type_t zp_type; 303 uint8_t zp_level; 304 uint8_t zp_copies; 305 boolean_t zp_dedup; 306 boolean_t zp_dedup_verify; 307 boolean_t zp_nopwrite; 308 } zio_prop_t; 309 310 typedef struct zio_cksum_report zio_cksum_report_t; 311 312 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 313 const void *good_data); 314 typedef void zio_cksum_free_f(void *cbdata, size_t size); 315 316 struct zio_bad_cksum; /* defined in zio_checksum.h */ 317 struct dnode_phys; 318 319 struct zio_cksum_report { 320 struct zio_cksum_report *zcr_next; 321 nvlist_t *zcr_ereport; 322 nvlist_t *zcr_detector; 323 void *zcr_cbdata; 324 size_t zcr_cbinfo; /* passed to zcr_free() */ 325 uint64_t zcr_align; 326 uint64_t zcr_length; 327 zio_cksum_finish_f *zcr_finish; 328 zio_cksum_free_f *zcr_free; 329 330 /* internal use only */ 331 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 332 }; 333 334 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 335 void *arg); 336 337 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 338 339 typedef struct zio_vsd_ops { 340 zio_done_func_t *vsd_free; 341 zio_vsd_cksum_report_f *vsd_cksum_report; 342 } zio_vsd_ops_t; 343 344 typedef struct zio_gang_node { 345 zio_gbh_phys_t *gn_gbh; 346 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 347 } zio_gang_node_t; 348 349 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 350 zio_gang_node_t *gn, void *data); 351 352 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 353 354 typedef struct zio_transform { 355 void *zt_orig_data; 356 uint64_t zt_orig_size; 357 uint64_t zt_bufsize; 358 zio_transform_func_t *zt_transform; 359 struct zio_transform *zt_next; 360 } zio_transform_t; 361 362 typedef int zio_pipe_stage_t(zio_t *zio); 363 364 /* 365 * The io_reexecute flags are distinct from io_flags because the child must 366 * be able to propagate them to the parent. The normal io_flags are local 367 * to the zio, not protected by any lock, and not modifiable by children; 368 * the reexecute flags are protected by io_lock, modifiable by children, 369 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 370 */ 371 #define ZIO_REEXECUTE_NOW 0x01 372 #define ZIO_REEXECUTE_SUSPEND 0x02 373 374 typedef struct zio_link { 375 zio_t *zl_parent; 376 zio_t *zl_child; 377 list_node_t zl_parent_node; 378 list_node_t zl_child_node; 379 } zio_link_t; 380 381 struct zio { 382 /* Core information about this I/O */ 383 zbookmark_t io_bookmark; 384 zio_prop_t io_prop; 385 zio_type_t io_type; 386 enum zio_child io_child_type; 387 int io_cmd; 388 zio_priority_t io_priority; 389 uint8_t io_reexecute; 390 uint8_t io_state[ZIO_WAIT_TYPES]; 391 uint64_t io_txg; 392 spa_t *io_spa; 393 blkptr_t *io_bp; 394 blkptr_t *io_bp_override; 395 blkptr_t io_bp_copy; 396 list_t io_parent_list; 397 list_t io_child_list; 398 zio_link_t *io_walk_link; 399 zio_t *io_logical; 400 zio_transform_t *io_transform_stack; 401 402 /* Callback info */ 403 zio_done_func_t *io_ready; 404 zio_done_func_t *io_physdone; 405 zio_done_func_t *io_done; 406 void *io_private; 407 int64_t io_prev_space_delta; /* DMU private */ 408 blkptr_t io_bp_orig; 409 410 /* Data represented by this I/O */ 411 void *io_data; 412 void *io_orig_data; 413 uint64_t io_size; 414 uint64_t io_orig_size; 415 416 /* Stuff for the vdev stack */ 417 vdev_t *io_vd; 418 void *io_vsd; 419 const zio_vsd_ops_t *io_vsd_ops; 420 421 uint64_t io_offset; 422 hrtime_t io_timestamp; 423 avl_node_t io_queue_node; 424 425 /* Internal pipeline state */ 426 enum zio_flag io_flags; 427 enum zio_stage io_stage; 428 enum zio_stage io_pipeline; 429 enum zio_flag io_orig_flags; 430 enum zio_stage io_orig_stage; 431 enum zio_stage io_orig_pipeline; 432 int io_error; 433 int io_child_error[ZIO_CHILD_TYPES]; 434 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 435 uint64_t io_child_count; 436 uint64_t io_phys_children; 437 uint64_t io_parent_count; 438 uint64_t *io_stall; 439 zio_t *io_gang_leader; 440 zio_gang_node_t *io_gang_tree; 441 void *io_executor; 442 void *io_waiter; 443 kmutex_t io_lock; 444 kcondvar_t io_cv; 445 446 /* FMA state */ 447 zio_cksum_report_t *io_cksum_report; 448 uint64_t io_ena; 449 450 /* Taskq dispatching state */ 451 taskq_ent_t io_tqent; 452 }; 453 454 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 455 zio_done_func_t *done, void *private, enum zio_flag flags); 456 457 extern zio_t *zio_root(spa_t *spa, 458 zio_done_func_t *done, void *private, enum zio_flag flags); 459 460 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 461 uint64_t size, zio_done_func_t *done, void *private, 462 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb); 463 464 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 465 void *data, uint64_t size, const zio_prop_t *zp, 466 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, 467 void *private, 468 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb); 469 470 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 471 void *data, uint64_t size, zio_done_func_t *done, void *private, 472 zio_priority_t priority, enum zio_flag flags, zbookmark_t *zb); 473 474 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 475 boolean_t nopwrite); 476 477 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 478 479 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 480 const blkptr_t *bp, 481 zio_done_func_t *done, void *private, enum zio_flag flags); 482 483 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 484 zio_done_func_t *done, void *private, enum zio_flag flags); 485 486 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 487 uint64_t size, void *data, int checksum, 488 zio_done_func_t *done, void *private, zio_priority_t priority, 489 enum zio_flag flags, boolean_t labels); 490 491 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 492 uint64_t size, void *data, int checksum, 493 zio_done_func_t *done, void *private, zio_priority_t priority, 494 enum zio_flag flags, boolean_t labels); 495 496 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 497 const blkptr_t *bp, enum zio_flag flags); 498 499 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 500 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 501 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 502 extern void zio_flush(zio_t *zio, vdev_t *vd); 503 extern void zio_shrink(zio_t *zio, uint64_t size); 504 505 extern int zio_wait(zio_t *zio); 506 extern void zio_nowait(zio_t *zio); 507 extern void zio_execute(zio_t *zio); 508 extern void zio_interrupt(zio_t *zio); 509 510 extern zio_t *zio_walk_parents(zio_t *cio); 511 extern zio_t *zio_walk_children(zio_t *pio); 512 extern zio_t *zio_unique_parent(zio_t *cio); 513 extern void zio_add_child(zio_t *pio, zio_t *cio); 514 515 extern void *zio_buf_alloc(size_t size); 516 extern void zio_buf_free(void *buf, size_t size); 517 extern void *zio_data_buf_alloc(size_t size); 518 extern void zio_data_buf_free(void *buf, size_t size); 519 520 extern void zio_resubmit_stage_async(void *); 521 522 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 523 uint64_t offset, void *data, uint64_t size, int type, 524 zio_priority_t priority, enum zio_flag flags, 525 zio_done_func_t *done, void *private); 526 527 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 528 void *data, uint64_t size, int type, zio_priority_t priority, 529 enum zio_flag flags, zio_done_func_t *done, void *private); 530 531 extern void zio_vdev_io_bypass(zio_t *zio); 532 extern void zio_vdev_io_reissue(zio_t *zio); 533 extern void zio_vdev_io_redone(zio_t *zio); 534 535 extern void zio_checksum_verified(zio_t *zio); 536 extern int zio_worst_error(int e1, int e2); 537 538 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 539 enum zio_checksum parent); 540 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 541 enum zio_checksum child, enum zio_checksum parent); 542 extern enum zio_compress zio_compress_select(enum zio_compress child, 543 enum zio_compress parent); 544 545 extern void zio_suspend(spa_t *spa, zio_t *zio); 546 extern int zio_resume(spa_t *spa); 547 extern void zio_resume_wait(spa_t *spa); 548 549 /* 550 * Initial setup and teardown. 551 */ 552 extern void zio_init(void); 553 extern void zio_fini(void); 554 555 /* 556 * Fault injection 557 */ 558 struct zinject_record; 559 extern uint32_t zio_injection_enabled; 560 extern int zio_inject_fault(char *name, int flags, int *id, 561 struct zinject_record *record); 562 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 563 struct zinject_record *record); 564 extern int zio_clear_fault(int id); 565 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 566 extern int zio_handle_fault_injection(zio_t *zio, int error); 567 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 568 extern int zio_handle_label_injection(zio_t *zio, int error); 569 extern void zio_handle_ignored_writes(zio_t *zio); 570 extern uint64_t zio_handle_io_delay(zio_t *zio); 571 572 /* 573 * Checksum ereport functions 574 */ 575 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 576 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 577 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 578 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 579 580 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 581 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 582 583 /* If we have the good data in hand, this function can be used */ 584 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 585 struct zio *zio, uint64_t offset, uint64_t length, 586 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 587 588 /* Called from spa_sync(), but primarily an injection handler */ 589 extern void spa_handle_ignored_writes(spa_t *spa); 590 591 /* zbookmark functions */ 592 boolean_t zbookmark_is_before(const struct dnode_phys *dnp, 593 const zbookmark_t *zb1, const zbookmark_t *zb2); 594 595 #ifdef __cplusplus 596 } 597 #endif 598 599 #endif /* _ZIO_H */ 600