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 /* 129 * The meaning of "compress = on" selected by the compression features enabled 130 * on a given pool. 131 */ 132 #define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB 133 #define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4 134 135 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 136 137 #define BOOTFS_COMPRESS_VALID(compress) \ 138 ((compress) == ZIO_COMPRESS_LZJB || \ 139 (compress) == ZIO_COMPRESS_LZ4 || \ 140 (compress) == ZIO_COMPRESS_ON || \ 141 (compress) == ZIO_COMPRESS_OFF) 142 143 #define ZIO_FAILURE_MODE_WAIT 0 144 #define ZIO_FAILURE_MODE_CONTINUE 1 145 #define ZIO_FAILURE_MODE_PANIC 2 146 147 typedef enum zio_priority { 148 ZIO_PRIORITY_SYNC_READ, 149 ZIO_PRIORITY_SYNC_WRITE, /* ZIL */ 150 ZIO_PRIORITY_ASYNC_READ, /* prefetch */ 151 ZIO_PRIORITY_ASYNC_WRITE, /* spa_sync() */ 152 ZIO_PRIORITY_SCRUB, /* asynchronous scrub/resilver reads */ 153 ZIO_PRIORITY_NUM_QUEUEABLE, 154 155 ZIO_PRIORITY_NOW /* non-queued i/os (e.g. free) */ 156 } zio_priority_t; 157 158 enum zio_flag { 159 /* 160 * Flags inherited by gang, ddt, and vdev children, 161 * and that must be equal for two zios to aggregate 162 */ 163 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 164 ZIO_FLAG_IO_REPAIR = 1 << 1, 165 ZIO_FLAG_SELF_HEAL = 1 << 2, 166 ZIO_FLAG_RESILVER = 1 << 3, 167 ZIO_FLAG_SCRUB = 1 << 4, 168 ZIO_FLAG_SCAN_THREAD = 1 << 5, 169 ZIO_FLAG_PHYSICAL = 1 << 6, 170 171 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 172 173 /* 174 * Flags inherited by ddt, gang, and vdev children. 175 */ 176 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 177 ZIO_FLAG_SPECULATIVE = 1 << 8, 178 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 179 ZIO_FLAG_DONT_RETRY = 1 << 10, 180 ZIO_FLAG_DONT_CACHE = 1 << 11, 181 ZIO_FLAG_NODATA = 1 << 12, 182 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 183 184 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 185 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 186 187 /* 188 * Flags inherited by vdev children. 189 */ 190 ZIO_FLAG_IO_RETRY = 1 << 14, /* must be first for INHERIT */ 191 ZIO_FLAG_PROBE = 1 << 15, 192 ZIO_FLAG_TRYHARD = 1 << 16, 193 ZIO_FLAG_OPTIONAL = 1 << 17, 194 195 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 196 197 /* 198 * Flags not inherited by any children. 199 */ 200 ZIO_FLAG_DONT_QUEUE = 1 << 18, /* must be first for INHERIT */ 201 ZIO_FLAG_DONT_PROPAGATE = 1 << 19, 202 ZIO_FLAG_IO_BYPASS = 1 << 20, 203 ZIO_FLAG_IO_REWRITE = 1 << 21, 204 ZIO_FLAG_RAW = 1 << 22, 205 ZIO_FLAG_GANG_CHILD = 1 << 23, 206 ZIO_FLAG_DDT_CHILD = 1 << 24, 207 ZIO_FLAG_GODFATHER = 1 << 25, 208 ZIO_FLAG_NOPWRITE = 1 << 26, 209 ZIO_FLAG_REEXECUTED = 1 << 27, 210 ZIO_FLAG_DELEGATED = 1 << 28, 211 }; 212 213 #define ZIO_FLAG_MUSTSUCCEED 0 214 215 #define ZIO_DDT_CHILD_FLAGS(zio) \ 216 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 217 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 218 219 #define ZIO_GANG_CHILD_FLAGS(zio) \ 220 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 221 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 222 223 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 224 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 225 ZIO_FLAG_CANFAIL) 226 227 enum zio_child { 228 ZIO_CHILD_VDEV = 0, 229 ZIO_CHILD_GANG, 230 ZIO_CHILD_DDT, 231 ZIO_CHILD_LOGICAL, 232 ZIO_CHILD_TYPES 233 }; 234 235 enum zio_wait_type { 236 ZIO_WAIT_READY = 0, 237 ZIO_WAIT_DONE, 238 ZIO_WAIT_TYPES 239 }; 240 241 /* 242 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 243 * graveyard) to indicate checksum errors and fragmentation. 244 */ 245 #define ECKSUM EBADE 246 #define EFRAGS EBADR 247 248 typedef void zio_done_func_t(zio_t *zio); 249 250 extern 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 */ 269 typedef 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) 300 301 typedef 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; 311 312 typedef struct zio_cksum_report zio_cksum_report_t; 313 314 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 315 const void *good_data); 316 typedef void zio_cksum_free_f(void *cbdata, size_t size); 317 318 struct zio_bad_cksum; /* defined in zio_checksum.h */ 319 struct dnode_phys; 320 321 struct 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 }; 335 336 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 337 void *arg); 338 339 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 340 341 typedef 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; 345 346 typedef 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; 350 351 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 352 zio_gang_node_t *gn, void *data); 353 354 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 355 356 typedef 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; 363 364 typedef int zio_pipe_stage_t(zio_t *zio); 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 375 376 typedef 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 struct zio { 384 /* Core information about this I/O */ 385 zbookmark_phys_t io_bookmark; 386 zio_prop_t io_prop; 387 zio_type_t io_type; 388 enum zio_child io_child_type; 389 int io_cmd; 390 zio_priority_t io_priority; 391 uint8_t io_reexecute; 392 uint8_t io_state[ZIO_WAIT_TYPES]; 393 uint64_t io_txg; 394 spa_t *io_spa; 395 blkptr_t *io_bp; 396 blkptr_t *io_bp_override; 397 blkptr_t io_bp_copy; 398 list_t io_parent_list; 399 list_t io_child_list; 400 zio_link_t *io_walk_link; 401 zio_t *io_logical; 402 zio_transform_t *io_transform_stack; 403 404 /* Callback info */ 405 zio_done_func_t *io_ready; 406 zio_done_func_t *io_physdone; 407 zio_done_func_t *io_done; 408 void *io_private; 409 int64_t io_prev_space_delta; /* DMU private */ 410 blkptr_t io_bp_orig; 411 412 /* Data represented by this I/O */ 413 void *io_data; 414 void *io_orig_data; 415 uint64_t io_size; 416 uint64_t io_orig_size; 417 418 /* Stuff for the vdev stack */ 419 vdev_t *io_vd; 420 void *io_vsd; 421 const zio_vsd_ops_t *io_vsd_ops; 422 423 uint64_t io_offset; 424 hrtime_t io_timestamp; 425 avl_node_t io_queue_node; 426 avl_node_t io_offset_node; 427 428 /* Internal pipeline state */ 429 enum zio_flag io_flags; 430 enum zio_stage io_stage; 431 enum zio_stage io_pipeline; 432 enum zio_flag io_orig_flags; 433 enum zio_stage io_orig_stage; 434 enum zio_stage io_orig_pipeline; 435 int io_error; 436 int io_child_error[ZIO_CHILD_TYPES]; 437 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 438 uint64_t io_child_count; 439 uint64_t io_phys_children; 440 uint64_t io_parent_count; 441 uint64_t *io_stall; 442 zio_t *io_gang_leader; 443 zio_gang_node_t *io_gang_tree; 444 void *io_executor; 445 void *io_waiter; 446 kmutex_t io_lock; 447 kcondvar_t io_cv; 448 449 /* FMA state */ 450 zio_cksum_report_t *io_cksum_report; 451 uint64_t io_ena; 452 453 /* Taskq dispatching state */ 454 taskq_ent_t io_tqent; 455 }; 456 457 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 458 zio_done_func_t *done, void *private, enum zio_flag flags); 459 460 extern zio_t *zio_root(spa_t *spa, 461 zio_done_func_t *done, void *private, enum zio_flag flags); 462 463 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 464 uint64_t size, zio_done_func_t *done, void *private, 465 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 466 467 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 468 void *data, uint64_t size, const zio_prop_t *zp, 469 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, 470 void *private, 471 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 472 473 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 474 void *data, uint64_t size, zio_done_func_t *done, void *private, 475 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 476 477 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 478 boolean_t nopwrite); 479 480 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 481 482 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 483 const blkptr_t *bp, 484 zio_done_func_t *done, void *private, enum zio_flag flags); 485 486 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 487 zio_done_func_t *done, void *private, enum zio_flag flags); 488 489 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 490 uint64_t size, void *data, int checksum, 491 zio_done_func_t *done, void *private, zio_priority_t priority, 492 enum zio_flag flags, boolean_t labels); 493 494 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 495 uint64_t size, void *data, int checksum, 496 zio_done_func_t *done, void *private, zio_priority_t priority, 497 enum zio_flag flags, boolean_t labels); 498 499 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 500 const blkptr_t *bp, enum zio_flag flags); 501 502 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 503 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 504 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 505 extern void zio_flush(zio_t *zio, vdev_t *vd); 506 extern void zio_shrink(zio_t *zio, uint64_t size); 507 508 extern int zio_wait(zio_t *zio); 509 extern void zio_nowait(zio_t *zio); 510 extern void zio_execute(zio_t *zio); 511 extern void zio_interrupt(zio_t *zio); 512 513 extern zio_t *zio_walk_parents(zio_t *cio); 514 extern zio_t *zio_walk_children(zio_t *pio); 515 extern zio_t *zio_unique_parent(zio_t *cio); 516 extern void zio_add_child(zio_t *pio, zio_t *cio); 517 518 extern void *zio_buf_alloc(size_t size); 519 extern void zio_buf_free(void *buf, size_t size); 520 extern void *zio_data_buf_alloc(size_t size); 521 extern void zio_data_buf_free(void *buf, size_t size); 522 523 extern void zio_resubmit_stage_async(void *); 524 525 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 526 uint64_t offset, void *data, uint64_t size, int type, 527 zio_priority_t priority, enum zio_flag flags, 528 zio_done_func_t *done, void *private); 529 530 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 531 void *data, uint64_t size, int type, zio_priority_t priority, 532 enum zio_flag flags, zio_done_func_t *done, void *private); 533 534 extern void zio_vdev_io_bypass(zio_t *zio); 535 extern void zio_vdev_io_reissue(zio_t *zio); 536 extern void zio_vdev_io_redone(zio_t *zio); 537 538 extern void zio_checksum_verified(zio_t *zio); 539 extern int zio_worst_error(int e1, int e2); 540 541 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 542 enum zio_checksum parent); 543 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 544 enum zio_checksum child, enum zio_checksum parent); 545 extern enum zio_compress zio_compress_select(spa_t *spa, 546 enum zio_compress child, enum zio_compress parent); 547 548 extern void zio_suspend(spa_t *spa, zio_t *zio); 549 extern int zio_resume(spa_t *spa); 550 extern void zio_resume_wait(spa_t *spa); 551 552 /* 553 * Initial setup and teardown. 554 */ 555 extern void zio_init(void); 556 extern void zio_fini(void); 557 558 /* 559 * Fault injection 560 */ 561 struct zinject_record; 562 extern uint32_t zio_injection_enabled; 563 extern int zio_inject_fault(char *name, int flags, int *id, 564 struct zinject_record *record); 565 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 566 struct zinject_record *record); 567 extern int zio_clear_fault(int id); 568 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 569 extern int zio_handle_fault_injection(zio_t *zio, int error); 570 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 571 extern int zio_handle_label_injection(zio_t *zio, int error); 572 extern void zio_handle_ignored_writes(zio_t *zio); 573 extern uint64_t zio_handle_io_delay(zio_t *zio); 574 575 /* 576 * Checksum ereport functions 577 */ 578 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 579 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 580 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 581 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 582 583 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 584 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 585 586 /* If we have the good data in hand, this function can be used */ 587 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 588 struct zio *zio, uint64_t offset, uint64_t length, 589 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 590 591 /* Called from spa_sync(), but primarily an injection handler */ 592 extern void spa_handle_ignored_writes(spa_t *spa); 593 594 /* zbookmark_phys functions */ 595 boolean_t zbookmark_is_before(const struct dnode_phys *dnp, 596 const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 597 598 #ifdef __cplusplus 599 } 600 #endif 601 602 #endif /* _ZIO_H */ 603