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 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _ZIO_H 28 #define _ZIO_H 29 30 #include <sys/zfs_context.h> 31 #include <sys/spa.h> 32 #include <sys/txg.h> 33 #include <sys/avl.h> 34 #include <sys/fs/zfs.h> 35 #include <sys/zio_impl.h> 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 /* 42 * Embedded checksum 43 */ 44 #define ZEC_MAGIC 0x210da7ab10c7a11ULL 45 46 typedef struct zio_eck { 47 uint64_t zec_magic; /* for validation, endianness */ 48 zio_cksum_t zec_cksum; /* 256-bit checksum */ 49 } zio_eck_t; 50 51 /* 52 * Gang block headers are self-checksumming and contain an array 53 * of block pointers. 54 */ 55 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE 56 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ 57 sizeof (zio_eck_t)) / sizeof (blkptr_t)) 58 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ 59 sizeof (zio_eck_t) - \ 60 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\ 61 sizeof (uint64_t)) 62 63 typedef struct zio_gbh { 64 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; 65 uint64_t zg_filler[SPA_GBH_FILLER]; 66 zio_eck_t zg_tail; 67 } zio_gbh_phys_t; 68 69 enum zio_checksum { 70 ZIO_CHECKSUM_INHERIT = 0, 71 ZIO_CHECKSUM_ON, 72 ZIO_CHECKSUM_OFF, 73 ZIO_CHECKSUM_LABEL, 74 ZIO_CHECKSUM_GANG_HEADER, 75 ZIO_CHECKSUM_ZILOG, 76 ZIO_CHECKSUM_FLETCHER_2, 77 ZIO_CHECKSUM_FLETCHER_4, 78 ZIO_CHECKSUM_SHA256, 79 ZIO_CHECKSUM_ZILOG2, 80 ZIO_CHECKSUM_FUNCTIONS 81 }; 82 83 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 84 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 85 86 #define ZIO_CHECKSUM_MASK 0xffULL 87 #define ZIO_CHECKSUM_VERIFY (1 << 8) 88 89 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 90 #define ZIO_DEDUPDITTO_MIN 100 91 92 enum zio_compress { 93 ZIO_COMPRESS_INHERIT = 0, 94 ZIO_COMPRESS_ON, 95 ZIO_COMPRESS_OFF, 96 ZIO_COMPRESS_LZJB, 97 ZIO_COMPRESS_EMPTY, 98 ZIO_COMPRESS_GZIP_1, 99 ZIO_COMPRESS_GZIP_2, 100 ZIO_COMPRESS_GZIP_3, 101 ZIO_COMPRESS_GZIP_4, 102 ZIO_COMPRESS_GZIP_5, 103 ZIO_COMPRESS_GZIP_6, 104 ZIO_COMPRESS_GZIP_7, 105 ZIO_COMPRESS_GZIP_8, 106 ZIO_COMPRESS_GZIP_9, 107 ZIO_COMPRESS_ZLE, 108 ZIO_COMPRESS_FUNCTIONS 109 }; 110 111 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB 112 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 113 114 #define BOOTFS_COMPRESS_VALID(compress) \ 115 ((compress) == ZIO_COMPRESS_LZJB || \ 116 ((compress) == ZIO_COMPRESS_ON && \ 117 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \ 118 (compress) == ZIO_COMPRESS_OFF) 119 120 #define ZIO_FAILURE_MODE_WAIT 0 121 #define ZIO_FAILURE_MODE_CONTINUE 1 122 #define ZIO_FAILURE_MODE_PANIC 2 123 124 #define ZIO_PRIORITY_NOW (zio_priority_table[0]) 125 #define ZIO_PRIORITY_SYNC_READ (zio_priority_table[1]) 126 #define ZIO_PRIORITY_SYNC_WRITE (zio_priority_table[2]) 127 #define ZIO_PRIORITY_LOG_WRITE (zio_priority_table[3]) 128 #define ZIO_PRIORITY_CACHE_FILL (zio_priority_table[4]) 129 #define ZIO_PRIORITY_AGG (zio_priority_table[5]) 130 #define ZIO_PRIORITY_FREE (zio_priority_table[6]) 131 #define ZIO_PRIORITY_ASYNC_WRITE (zio_priority_table[7]) 132 #define ZIO_PRIORITY_ASYNC_READ (zio_priority_table[8]) 133 #define ZIO_PRIORITY_RESILVER (zio_priority_table[9]) 134 #define ZIO_PRIORITY_SCRUB (zio_priority_table[10]) 135 #define ZIO_PRIORITY_TABLE_SIZE 11 136 137 #define ZIO_PIPELINE_CONTINUE 0x100 138 #define ZIO_PIPELINE_STOP 0x101 139 140 enum zio_flag { 141 /* 142 * Flags inherited by gang, ddt, and vdev children, 143 * and that must be equal for two zios to aggregate 144 */ 145 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 146 ZIO_FLAG_IO_REPAIR = 1 << 1, 147 ZIO_FLAG_SELF_HEAL = 1 << 2, 148 ZIO_FLAG_RESILVER = 1 << 3, 149 ZIO_FLAG_SCRUB = 1 << 4, 150 ZIO_FLAG_SCRUB_THREAD = 1 << 5, 151 152 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 153 154 /* 155 * Flags inherited by ddt, gang, and vdev children. 156 */ 157 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */ 158 ZIO_FLAG_SPECULATIVE = 1 << 7, 159 ZIO_FLAG_CONFIG_WRITER = 1 << 8, 160 ZIO_FLAG_DONT_RETRY = 1 << 9, 161 ZIO_FLAG_DONT_CACHE = 1 << 10, 162 ZIO_FLAG_NODATA = 1 << 11, 163 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12, 164 165 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 166 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 167 168 /* 169 * Flags inherited by vdev children. 170 */ 171 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */ 172 ZIO_FLAG_PROBE = 1 << 14, 173 ZIO_FLAG_TRYHARD = 1 << 15, 174 ZIO_FLAG_OPTIONAL = 1 << 16, 175 176 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 177 178 /* 179 * Flags not inherited by any children. 180 */ 181 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */ 182 ZIO_FLAG_DONT_PROPAGATE = 1 << 18, 183 ZIO_FLAG_IO_BYPASS = 1 << 19, 184 ZIO_FLAG_IO_REWRITE = 1 << 20, 185 ZIO_FLAG_RAW = 1 << 21, 186 ZIO_FLAG_GANG_CHILD = 1 << 22, 187 ZIO_FLAG_DDT_CHILD = 1 << 23, 188 ZIO_FLAG_GODFATHER = 1 << 24 189 }; 190 191 #define ZIO_FLAG_MUSTSUCCEED 0 192 193 #define ZIO_DDT_CHILD_FLAGS(zio) \ 194 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 195 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 196 197 #define ZIO_GANG_CHILD_FLAGS(zio) \ 198 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 199 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 200 201 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 202 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 203 ZIO_FLAG_CANFAIL) 204 205 enum zio_child { 206 ZIO_CHILD_VDEV = 0, 207 ZIO_CHILD_GANG, 208 ZIO_CHILD_DDT, 209 ZIO_CHILD_LOGICAL, 210 ZIO_CHILD_TYPES 211 }; 212 213 enum zio_wait_type { 214 ZIO_WAIT_READY = 0, 215 ZIO_WAIT_DONE, 216 ZIO_WAIT_TYPES 217 }; 218 219 /* 220 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 221 * graveyard) to indicate checksum errors and fragmentation. 222 */ 223 #define ECKSUM EBADE 224 #define EFRAGS EBADR 225 226 typedef void zio_done_func_t(zio_t *zio); 227 228 extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE]; 229 extern char *zio_type_name[ZIO_TYPES]; 230 231 /* 232 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 233 * identifies any block in the pool. By convention, the meta-objset (MOS) 234 * is objset 0, and the meta-dnode is object 0. This covers all blocks 235 * except root blocks and ZIL blocks, which are defined as follows: 236 * 237 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 238 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 239 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 240 * 241 * Note: this structure is called a bookmark because its original purpose 242 * was to remember where to resume a pool-wide traverse. 243 * 244 * Note: this structure is passed between userland and the kernel. 245 * Therefore it must not change size or alignment between 32/64 bit 246 * compilation options. 247 */ 248 typedef struct zbookmark { 249 uint64_t zb_objset; 250 uint64_t zb_object; 251 int64_t zb_level; 252 uint64_t zb_blkid; 253 } zbookmark_t; 254 255 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 256 { \ 257 (zb)->zb_objset = objset; \ 258 (zb)->zb_object = object; \ 259 (zb)->zb_level = level; \ 260 (zb)->zb_blkid = blkid; \ 261 } 262 263 #define ZB_DESTROYED_OBJSET (-1ULL) 264 265 #define ZB_ROOT_OBJECT (0ULL) 266 #define ZB_ROOT_LEVEL (-1LL) 267 #define ZB_ROOT_BLKID (0ULL) 268 269 #define ZB_ZIL_OBJECT (0ULL) 270 #define ZB_ZIL_LEVEL (-2LL) 271 272 typedef struct zio_prop { 273 enum zio_checksum zp_checksum; 274 enum zio_compress zp_compress; 275 dmu_object_type_t zp_type; 276 uint8_t zp_level; 277 uint8_t zp_copies; 278 uint8_t zp_dedup; 279 uint8_t zp_dedup_verify; 280 } zio_prop_t; 281 282 typedef struct zio_cksum_report zio_cksum_report_t; 283 284 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 285 const void *good_data); 286 typedef void zio_cksum_free_f(void *cbdata, size_t size); 287 288 struct zio_bad_cksum; /* defined in zio_checksum.h */ 289 290 struct zio_cksum_report { 291 struct zio_cksum_report *zcr_next; 292 nvlist_t *zcr_ereport; 293 nvlist_t *zcr_detector; 294 void *zcr_cbdata; 295 size_t zcr_cbinfo; /* passed to zcr_free() */ 296 uint64_t zcr_align; 297 uint64_t zcr_length; 298 zio_cksum_finish_f *zcr_finish; 299 zio_cksum_free_f *zcr_free; 300 301 /* internal use only */ 302 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 303 }; 304 305 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 306 void *arg); 307 308 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 309 310 typedef struct zio_vsd_ops { 311 zio_done_func_t *vsd_free; 312 zio_vsd_cksum_report_f *vsd_cksum_report; 313 } zio_vsd_ops_t; 314 315 typedef struct zio_gang_node { 316 zio_gbh_phys_t *gn_gbh; 317 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 318 } zio_gang_node_t; 319 320 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 321 zio_gang_node_t *gn, void *data); 322 323 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 324 325 typedef struct zio_transform { 326 void *zt_orig_data; 327 uint64_t zt_orig_size; 328 uint64_t zt_bufsize; 329 zio_transform_func_t *zt_transform; 330 struct zio_transform *zt_next; 331 } zio_transform_t; 332 333 typedef int zio_pipe_stage_t(zio_t *zio); 334 335 /* 336 * The io_reexecute flags are distinct from io_flags because the child must 337 * be able to propagate them to the parent. The normal io_flags are local 338 * to the zio, not protected by any lock, and not modifiable by children; 339 * the reexecute flags are protected by io_lock, modifiable by children, 340 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 341 */ 342 #define ZIO_REEXECUTE_NOW 0x01 343 #define ZIO_REEXECUTE_SUSPEND 0x02 344 345 typedef struct zio_link { 346 zio_t *zl_parent; 347 zio_t *zl_child; 348 list_node_t zl_parent_node; 349 list_node_t zl_child_node; 350 } zio_link_t; 351 352 struct zio { 353 /* Core information about this I/O */ 354 zbookmark_t io_bookmark; 355 zio_prop_t io_prop; 356 zio_type_t io_type; 357 enum zio_child io_child_type; 358 int io_cmd; 359 uint8_t io_priority; 360 uint8_t io_reexecute; 361 uint8_t io_state[ZIO_WAIT_TYPES]; 362 uint64_t io_txg; 363 spa_t *io_spa; 364 blkptr_t *io_bp; 365 blkptr_t *io_bp_override; 366 blkptr_t io_bp_copy; 367 list_t io_parent_list; 368 list_t io_child_list; 369 zio_link_t *io_walk_link; 370 zio_t *io_logical; 371 zio_transform_t *io_transform_stack; 372 373 /* Callback info */ 374 zio_done_func_t *io_ready; 375 zio_done_func_t *io_done; 376 void *io_private; 377 int64_t io_prev_space_delta; /* DMU private */ 378 blkptr_t io_bp_orig; 379 380 /* Data represented by this I/O */ 381 void *io_data; 382 void *io_orig_data; 383 uint64_t io_size; 384 uint64_t io_orig_size; 385 386 /* Stuff for the vdev stack */ 387 vdev_t *io_vd; 388 void *io_vsd; 389 const zio_vsd_ops_t *io_vsd_ops; 390 391 uint64_t io_offset; 392 uint64_t io_deadline; 393 avl_node_t io_offset_node; 394 avl_node_t io_deadline_node; 395 avl_tree_t *io_vdev_tree; 396 397 /* Internal pipeline state */ 398 enum zio_flag io_flags; 399 enum zio_stage io_stage; 400 enum zio_stage io_pipeline; 401 enum zio_flag io_orig_flags; 402 enum zio_stage io_orig_stage; 403 enum zio_stage io_orig_pipeline; 404 int io_error; 405 int io_child_error[ZIO_CHILD_TYPES]; 406 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 407 uint64_t io_child_count; 408 uint64_t io_parent_count; 409 uint64_t *io_stall; 410 zio_t *io_gang_leader; 411 zio_gang_node_t *io_gang_tree; 412 void *io_executor; 413 void *io_waiter; 414 kmutex_t io_lock; 415 kcondvar_t io_cv; 416 417 /* FMA state */ 418 zio_cksum_report_t *io_cksum_report; 419 uint64_t io_ena; 420 }; 421 422 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 423 zio_done_func_t *done, void *private, enum zio_flag flags); 424 425 extern zio_t *zio_root(spa_t *spa, 426 zio_done_func_t *done, void *private, enum zio_flag flags); 427 428 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 429 uint64_t size, zio_done_func_t *done, void *private, 430 int priority, enum zio_flag flags, const zbookmark_t *zb); 431 432 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 433 void *data, uint64_t size, const zio_prop_t *zp, 434 zio_done_func_t *ready, zio_done_func_t *done, void *private, 435 int priority, enum zio_flag flags, const zbookmark_t *zb); 436 437 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 438 void *data, uint64_t size, zio_done_func_t *done, void *private, 439 int priority, enum zio_flag flags, zbookmark_t *zb); 440 441 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies); 442 443 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 444 445 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 446 const blkptr_t *bp, 447 zio_done_func_t *done, void *private, enum zio_flag flags); 448 449 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 450 zio_done_func_t *done, void *private, int priority, enum zio_flag flags); 451 452 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 453 uint64_t size, void *data, int checksum, 454 zio_done_func_t *done, void *private, int priority, enum zio_flag flags, 455 boolean_t labels); 456 457 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 458 uint64_t size, void *data, int checksum, 459 zio_done_func_t *done, void *private, int priority, enum zio_flag flags, 460 boolean_t labels); 461 462 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 463 const blkptr_t *bp, enum zio_flag flags); 464 465 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 466 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 467 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 468 extern void zio_flush(zio_t *zio, vdev_t *vd); 469 extern void zio_shrink(zio_t *zio, uint64_t size); 470 471 extern int zio_wait(zio_t *zio); 472 extern void zio_nowait(zio_t *zio); 473 extern void zio_execute(zio_t *zio); 474 extern void zio_interrupt(zio_t *zio); 475 476 extern zio_t *zio_walk_parents(zio_t *cio); 477 extern zio_t *zio_walk_children(zio_t *pio); 478 extern zio_t *zio_unique_parent(zio_t *cio); 479 extern void zio_add_child(zio_t *pio, zio_t *cio); 480 481 extern void *zio_buf_alloc(size_t size); 482 extern void zio_buf_free(void *buf, size_t size); 483 extern void *zio_data_buf_alloc(size_t size); 484 extern void zio_data_buf_free(void *buf, size_t size); 485 486 extern void zio_resubmit_stage_async(void *); 487 488 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 489 uint64_t offset, void *data, uint64_t size, int type, int priority, 490 enum zio_flag flags, zio_done_func_t *done, void *private); 491 492 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 493 void *data, uint64_t size, int type, int priority, 494 enum zio_flag flags, zio_done_func_t *done, void *private); 495 496 extern void zio_vdev_io_bypass(zio_t *zio); 497 extern void zio_vdev_io_reissue(zio_t *zio); 498 extern void zio_vdev_io_redone(zio_t *zio); 499 500 extern void zio_checksum_verified(zio_t *zio); 501 extern int zio_worst_error(int e1, int e2); 502 503 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 504 enum zio_checksum parent); 505 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 506 enum zio_checksum child, enum zio_checksum parent); 507 extern enum zio_compress zio_compress_select(enum zio_compress child, 508 enum zio_compress parent); 509 510 extern void zio_suspend(spa_t *spa, zio_t *zio); 511 extern int zio_resume(spa_t *spa); 512 extern void zio_resume_wait(spa_t *spa); 513 514 /* 515 * Initial setup and teardown. 516 */ 517 extern void zio_init(void); 518 extern void zio_fini(void); 519 520 /* 521 * Fault injection 522 */ 523 struct zinject_record; 524 extern uint32_t zio_injection_enabled; 525 extern int zio_inject_fault(char *name, int flags, int *id, 526 struct zinject_record *record); 527 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 528 struct zinject_record *record); 529 extern int zio_clear_fault(int id); 530 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 531 extern int zio_handle_fault_injection(zio_t *zio, int error); 532 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 533 extern int zio_handle_label_injection(zio_t *zio, int error); 534 extern void zio_handle_ignored_writes(zio_t *zio); 535 536 /* 537 * Checksum ereport functions 538 */ 539 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 540 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 541 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 542 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 543 544 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 545 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 546 547 /* If we have the good data in hand, this function can be used */ 548 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 549 struct zio *zio, uint64_t offset, uint64_t length, 550 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 551 552 /* Called from spa_sync(), but primarily an injection handler */ 553 extern void spa_handle_ignored_writes(spa_t *spa); 554 555 #ifdef __cplusplus 556 } 557 #endif 558 559 #endif /* _ZIO_H */ 560