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 * 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 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 88 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 89 90 #define ZIO_CHECKSUM_MASK 0xffULL 91 #define ZIO_CHECKSUM_VERIFY (1 << 8) 92 93 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 94 #define ZIO_DEDUPDITTO_MIN 100 95 96 enum zio_compress { 97 ZIO_COMPRESS_INHERIT = 0, 98 ZIO_COMPRESS_ON, 99 ZIO_COMPRESS_OFF, 100 ZIO_COMPRESS_LZJB, 101 ZIO_COMPRESS_EMPTY, 102 ZIO_COMPRESS_GZIP_1, 103 ZIO_COMPRESS_GZIP_2, 104 ZIO_COMPRESS_GZIP_3, 105 ZIO_COMPRESS_GZIP_4, 106 ZIO_COMPRESS_GZIP_5, 107 ZIO_COMPRESS_GZIP_6, 108 ZIO_COMPRESS_GZIP_7, 109 ZIO_COMPRESS_GZIP_8, 110 ZIO_COMPRESS_GZIP_9, 111 ZIO_COMPRESS_ZLE, 112 ZIO_COMPRESS_LZ4, 113 ZIO_COMPRESS_FUNCTIONS 114 }; 115 116 /* N.B. when altering this value, also change BOOTFS_COMPRESS_VALID below */ 117 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB 118 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 119 120 #define BOOTFS_COMPRESS_VALID(compress) \ 121 ((compress) == ZIO_COMPRESS_LZJB || \ 122 (compress) == ZIO_COMPRESS_LZ4 || \ 123 ((compress) == ZIO_COMPRESS_ON && \ 124 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \ 125 (compress) == ZIO_COMPRESS_OFF) 126 127 #define ZIO_FAILURE_MODE_WAIT 0 128 #define ZIO_FAILURE_MODE_CONTINUE 1 129 #define ZIO_FAILURE_MODE_PANIC 2 130 131 #define ZIO_PRIORITY_NOW (zio_priority_table[0]) 132 #define ZIO_PRIORITY_SYNC_READ (zio_priority_table[1]) 133 #define ZIO_PRIORITY_SYNC_WRITE (zio_priority_table[2]) 134 #define ZIO_PRIORITY_LOG_WRITE (zio_priority_table[3]) 135 #define ZIO_PRIORITY_CACHE_FILL (zio_priority_table[4]) 136 #define ZIO_PRIORITY_AGG (zio_priority_table[5]) 137 #define ZIO_PRIORITY_FREE (zio_priority_table[6]) 138 #define ZIO_PRIORITY_ASYNC_WRITE (zio_priority_table[7]) 139 #define ZIO_PRIORITY_ASYNC_READ (zio_priority_table[8]) 140 #define ZIO_PRIORITY_RESILVER (zio_priority_table[9]) 141 #define ZIO_PRIORITY_SCRUB (zio_priority_table[10]) 142 #define ZIO_PRIORITY_DDT_PREFETCH (zio_priority_table[11]) 143 #define ZIO_PRIORITY_TABLE_SIZE 12 144 145 #define ZIO_PIPELINE_CONTINUE 0x100 146 #define ZIO_PIPELINE_STOP 0x101 147 148 enum zio_flag { 149 /* 150 * Flags inherited by gang, ddt, and vdev children, 151 * and that must be equal for two zios to aggregate 152 */ 153 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 154 ZIO_FLAG_IO_REPAIR = 1 << 1, 155 ZIO_FLAG_SELF_HEAL = 1 << 2, 156 ZIO_FLAG_RESILVER = 1 << 3, 157 ZIO_FLAG_SCRUB = 1 << 4, 158 ZIO_FLAG_SCAN_THREAD = 1 << 5, 159 160 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 161 162 /* 163 * Flags inherited by ddt, gang, and vdev children. 164 */ 165 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */ 166 ZIO_FLAG_SPECULATIVE = 1 << 7, 167 ZIO_FLAG_CONFIG_WRITER = 1 << 8, 168 ZIO_FLAG_DONT_RETRY = 1 << 9, 169 ZIO_FLAG_DONT_CACHE = 1 << 10, 170 ZIO_FLAG_NODATA = 1 << 11, 171 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12, 172 173 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 174 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 175 176 /* 177 * Flags inherited by vdev children. 178 */ 179 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */ 180 ZIO_FLAG_PROBE = 1 << 14, 181 ZIO_FLAG_TRYHARD = 1 << 15, 182 ZIO_FLAG_OPTIONAL = 1 << 16, 183 184 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 185 186 /* 187 * Flags not inherited by any children. 188 */ 189 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */ 190 ZIO_FLAG_DONT_PROPAGATE = 1 << 18, 191 ZIO_FLAG_IO_BYPASS = 1 << 19, 192 ZIO_FLAG_IO_REWRITE = 1 << 20, 193 ZIO_FLAG_RAW = 1 << 21, 194 ZIO_FLAG_GANG_CHILD = 1 << 22, 195 ZIO_FLAG_DDT_CHILD = 1 << 23, 196 ZIO_FLAG_GODFATHER = 1 << 24, 197 ZIO_FLAG_NOPWRITE = 1 << 25, 198 ZIO_FLAG_REEXECUTED = 1 << 26, 199 }; 200 201 #define ZIO_FLAG_MUSTSUCCEED 0 202 203 #define ZIO_DDT_CHILD_FLAGS(zio) \ 204 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 205 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 206 207 #define ZIO_GANG_CHILD_FLAGS(zio) \ 208 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 209 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 210 211 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 212 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 213 ZIO_FLAG_CANFAIL) 214 215 enum zio_child { 216 ZIO_CHILD_VDEV = 0, 217 ZIO_CHILD_GANG, 218 ZIO_CHILD_DDT, 219 ZIO_CHILD_LOGICAL, 220 ZIO_CHILD_TYPES 221 }; 222 223 enum zio_wait_type { 224 ZIO_WAIT_READY = 0, 225 ZIO_WAIT_DONE, 226 ZIO_WAIT_TYPES 227 }; 228 229 /* 230 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 231 * graveyard) to indicate checksum errors and fragmentation. 232 */ 233 #define ECKSUM EBADE 234 #define EFRAGS EBADR 235 236 typedef void zio_done_func_t(zio_t *zio); 237 238 extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE]; 239 extern char *zio_type_name[ZIO_TYPES]; 240 241 /* 242 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 243 * identifies any block in the pool. By convention, the meta-objset (MOS) 244 * is objset 0, and the meta-dnode is object 0. This covers all blocks 245 * except root blocks and ZIL blocks, which are defined as follows: 246 * 247 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 248 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 249 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 250 * 251 * Note: this structure is called a bookmark because its original purpose 252 * was to remember where to resume a pool-wide traverse. 253 * 254 * Note: this structure is passed between userland and the kernel. 255 * Therefore it must not change size or alignment between 32/64 bit 256 * compilation options. 257 */ 258 typedef struct zbookmark { 259 uint64_t zb_objset; 260 uint64_t zb_object; 261 int64_t zb_level; 262 uint64_t zb_blkid; 263 } zbookmark_t; 264 265 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 266 { \ 267 (zb)->zb_objset = objset; \ 268 (zb)->zb_object = object; \ 269 (zb)->zb_level = level; \ 270 (zb)->zb_blkid = blkid; \ 271 } 272 273 #define ZB_DESTROYED_OBJSET (-1ULL) 274 275 #define ZB_ROOT_OBJECT (0ULL) 276 #define ZB_ROOT_LEVEL (-1LL) 277 #define ZB_ROOT_BLKID (0ULL) 278 279 #define ZB_ZIL_OBJECT (0ULL) 280 #define ZB_ZIL_LEVEL (-2LL) 281 282 #define ZB_IS_ZERO(zb) \ 283 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 284 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 285 #define ZB_IS_ROOT(zb) \ 286 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 287 (zb)->zb_level == ZB_ROOT_LEVEL && \ 288 (zb)->zb_blkid == ZB_ROOT_BLKID) 289 290 typedef struct zio_prop { 291 enum zio_checksum zp_checksum; 292 enum zio_compress zp_compress; 293 dmu_object_type_t zp_type; 294 uint8_t zp_level; 295 uint8_t zp_copies; 296 boolean_t zp_dedup; 297 boolean_t zp_dedup_verify; 298 boolean_t zp_nopwrite; 299 } zio_prop_t; 300 301 typedef struct zio_cksum_report zio_cksum_report_t; 302 303 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 304 const void *good_data); 305 typedef void zio_cksum_free_f(void *cbdata, size_t size); 306 307 struct zio_bad_cksum; /* defined in zio_checksum.h */ 308 struct dnode_phys; 309 310 struct zio_cksum_report { 311 struct zio_cksum_report *zcr_next; 312 nvlist_t *zcr_ereport; 313 nvlist_t *zcr_detector; 314 void *zcr_cbdata; 315 size_t zcr_cbinfo; /* passed to zcr_free() */ 316 uint64_t zcr_align; 317 uint64_t zcr_length; 318 zio_cksum_finish_f *zcr_finish; 319 zio_cksum_free_f *zcr_free; 320 321 /* internal use only */ 322 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 323 }; 324 325 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 326 void *arg); 327 328 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 329 330 typedef struct zio_vsd_ops { 331 zio_done_func_t *vsd_free; 332 zio_vsd_cksum_report_f *vsd_cksum_report; 333 } zio_vsd_ops_t; 334 335 typedef struct zio_gang_node { 336 zio_gbh_phys_t *gn_gbh; 337 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 338 } zio_gang_node_t; 339 340 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 341 zio_gang_node_t *gn, void *data); 342 343 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 344 345 typedef struct zio_transform { 346 void *zt_orig_data; 347 uint64_t zt_orig_size; 348 uint64_t zt_bufsize; 349 zio_transform_func_t *zt_transform; 350 struct zio_transform *zt_next; 351 } zio_transform_t; 352 353 typedef int zio_pipe_stage_t(zio_t *zio); 354 355 /* 356 * The io_reexecute flags are distinct from io_flags because the child must 357 * be able to propagate them to the parent. The normal io_flags are local 358 * to the zio, not protected by any lock, and not modifiable by children; 359 * the reexecute flags are protected by io_lock, modifiable by children, 360 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 361 */ 362 #define ZIO_REEXECUTE_NOW 0x01 363 #define ZIO_REEXECUTE_SUSPEND 0x02 364 365 typedef struct zio_link { 366 zio_t *zl_parent; 367 zio_t *zl_child; 368 list_node_t zl_parent_node; 369 list_node_t zl_child_node; 370 } zio_link_t; 371 372 struct zio { 373 /* Core information about this I/O */ 374 zbookmark_t io_bookmark; 375 zio_prop_t io_prop; 376 zio_type_t io_type; 377 enum zio_child io_child_type; 378 int io_cmd; 379 uint8_t io_priority; 380 uint8_t io_reexecute; 381 uint8_t io_state[ZIO_WAIT_TYPES]; 382 uint64_t io_txg; 383 spa_t *io_spa; 384 blkptr_t *io_bp; 385 blkptr_t *io_bp_override; 386 blkptr_t io_bp_copy; 387 list_t io_parent_list; 388 list_t io_child_list; 389 zio_link_t *io_walk_link; 390 zio_t *io_logical; 391 zio_transform_t *io_transform_stack; 392 393 /* Callback info */ 394 zio_done_func_t *io_ready; 395 zio_done_func_t *io_done; 396 void *io_private; 397 int64_t io_prev_space_delta; /* DMU private */ 398 blkptr_t io_bp_orig; 399 400 /* Data represented by this I/O */ 401 void *io_data; 402 void *io_orig_data; 403 uint64_t io_size; 404 uint64_t io_orig_size; 405 406 /* Stuff for the vdev stack */ 407 vdev_t *io_vd; 408 void *io_vsd; 409 const zio_vsd_ops_t *io_vsd_ops; 410 411 uint64_t io_offset; 412 uint64_t io_deadline; 413 hrtime_t io_timestamp; 414 avl_node_t io_offset_node; 415 avl_node_t io_deadline_node; 416 avl_tree_t *io_vdev_tree; 417 418 /* Internal pipeline state */ 419 enum zio_flag io_flags; 420 enum zio_stage io_stage; 421 enum zio_stage io_pipeline; 422 enum zio_flag io_orig_flags; 423 enum zio_stage io_orig_stage; 424 enum zio_stage io_orig_pipeline; 425 int io_error; 426 int io_child_error[ZIO_CHILD_TYPES]; 427 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 428 uint64_t io_child_count; 429 uint64_t io_parent_count; 430 uint64_t *io_stall; 431 zio_t *io_gang_leader; 432 zio_gang_node_t *io_gang_tree; 433 void *io_executor; 434 void *io_waiter; 435 kmutex_t io_lock; 436 kcondvar_t io_cv; 437 438 /* FMA state */ 439 zio_cksum_report_t *io_cksum_report; 440 uint64_t io_ena; 441 442 /* Taskq dispatching state */ 443 taskq_ent_t io_tqent; 444 }; 445 446 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 447 zio_done_func_t *done, void *private, enum zio_flag flags); 448 449 extern zio_t *zio_root(spa_t *spa, 450 zio_done_func_t *done, void *private, enum zio_flag flags); 451 452 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 453 uint64_t size, zio_done_func_t *done, void *private, 454 int priority, enum zio_flag flags, const zbookmark_t *zb); 455 456 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 457 void *data, uint64_t size, const zio_prop_t *zp, 458 zio_done_func_t *ready, zio_done_func_t *done, void *private, 459 int priority, enum zio_flag flags, const zbookmark_t *zb); 460 461 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 462 void *data, uint64_t size, zio_done_func_t *done, void *private, 463 int priority, enum zio_flag flags, zbookmark_t *zb); 464 465 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 466 boolean_t nopwrite); 467 468 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 469 470 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 471 const blkptr_t *bp, 472 zio_done_func_t *done, void *private, enum zio_flag flags); 473 474 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 475 zio_done_func_t *done, void *private, int priority, enum zio_flag flags); 476 477 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 478 uint64_t size, void *data, int checksum, 479 zio_done_func_t *done, void *private, int priority, enum zio_flag flags, 480 boolean_t labels); 481 482 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 483 uint64_t size, void *data, int checksum, 484 zio_done_func_t *done, void *private, int priority, enum zio_flag flags, 485 boolean_t labels); 486 487 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 488 const blkptr_t *bp, enum zio_flag flags); 489 490 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 491 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 492 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 493 extern void zio_flush(zio_t *zio, vdev_t *vd); 494 extern void zio_shrink(zio_t *zio, uint64_t size); 495 496 extern int zio_wait(zio_t *zio); 497 extern void zio_nowait(zio_t *zio); 498 extern void zio_execute(zio_t *zio); 499 extern void zio_interrupt(zio_t *zio); 500 501 extern zio_t *zio_walk_parents(zio_t *cio); 502 extern zio_t *zio_walk_children(zio_t *pio); 503 extern zio_t *zio_unique_parent(zio_t *cio); 504 extern void zio_add_child(zio_t *pio, zio_t *cio); 505 506 extern void *zio_buf_alloc(size_t size); 507 extern void zio_buf_free(void *buf, size_t size); 508 extern void *zio_data_buf_alloc(size_t size); 509 extern void zio_data_buf_free(void *buf, size_t size); 510 511 extern void zio_resubmit_stage_async(void *); 512 513 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 514 uint64_t offset, void *data, uint64_t size, int type, int priority, 515 enum zio_flag flags, zio_done_func_t *done, void *private); 516 517 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 518 void *data, uint64_t size, int type, int priority, 519 enum zio_flag flags, zio_done_func_t *done, void *private); 520 521 extern void zio_vdev_io_bypass(zio_t *zio); 522 extern void zio_vdev_io_reissue(zio_t *zio); 523 extern void zio_vdev_io_redone(zio_t *zio); 524 525 extern void zio_checksum_verified(zio_t *zio); 526 extern int zio_worst_error(int e1, int e2); 527 528 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 529 enum zio_checksum parent); 530 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 531 enum zio_checksum child, enum zio_checksum parent); 532 extern enum zio_compress zio_compress_select(enum zio_compress child, 533 enum zio_compress parent); 534 535 extern void zio_suspend(spa_t *spa, zio_t *zio); 536 extern int zio_resume(spa_t *spa); 537 extern void zio_resume_wait(spa_t *spa); 538 539 /* 540 * Initial setup and teardown. 541 */ 542 extern void zio_init(void); 543 extern void zio_fini(void); 544 545 /* 546 * Fault injection 547 */ 548 struct zinject_record; 549 extern uint32_t zio_injection_enabled; 550 extern int zio_inject_fault(char *name, int flags, int *id, 551 struct zinject_record *record); 552 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 553 struct zinject_record *record); 554 extern int zio_clear_fault(int id); 555 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 556 extern int zio_handle_fault_injection(zio_t *zio, int error); 557 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 558 extern int zio_handle_label_injection(zio_t *zio, int error); 559 extern void zio_handle_ignored_writes(zio_t *zio); 560 extern uint64_t zio_handle_io_delay(zio_t *zio); 561 562 /* 563 * Checksum ereport functions 564 */ 565 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 566 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 567 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 568 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 569 570 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 571 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 572 573 /* If we have the good data in hand, this function can be used */ 574 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 575 struct zio *zio, uint64_t offset, uint64_t length, 576 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 577 578 /* Called from spa_sync(), but primarily an injection handler */ 579 extern void spa_handle_ignored_writes(spa_t *spa); 580 581 /* zbookmark functions */ 582 boolean_t zbookmark_is_before(const struct dnode_phys *dnp, 583 const zbookmark_t *zb1, const zbookmark_t *zb2); 584 585 #ifdef __cplusplus 586 } 587 #endif 588 589 #endif /* _ZIO_H */ 590