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 2009 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 #define ZBT_MAGIC 0x210da7ab10c7a11ULL /* zio data bloc tail */ 42 43 typedef struct zio_block_tail { 44 uint64_t zbt_magic; /* for validation, endianness */ 45 zio_cksum_t zbt_cksum; /* 256-bit checksum */ 46 } zio_block_tail_t; 47 48 /* 49 * Gang block headers are self-checksumming and contain an array 50 * of block pointers. 51 */ 52 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE 53 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ 54 sizeof (zio_block_tail_t)) / sizeof (blkptr_t)) 55 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ 56 sizeof (zio_block_tail_t) - \ 57 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\ 58 sizeof (uint64_t)) 59 60 typedef struct zio_gbh { 61 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; 62 uint64_t zg_filler[SPA_GBH_FILLER]; 63 zio_block_tail_t zg_tail; 64 } zio_gbh_phys_t; 65 66 enum zio_checksum { 67 ZIO_CHECKSUM_INHERIT = 0, 68 ZIO_CHECKSUM_ON, 69 ZIO_CHECKSUM_OFF, 70 ZIO_CHECKSUM_LABEL, 71 ZIO_CHECKSUM_GANG_HEADER, 72 ZIO_CHECKSUM_ZILOG, 73 ZIO_CHECKSUM_FLETCHER_2, 74 ZIO_CHECKSUM_FLETCHER_4, 75 ZIO_CHECKSUM_SHA256, 76 ZIO_CHECKSUM_FUNCTIONS 77 }; 78 79 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 80 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 81 82 #define ZIO_CHECKSUM_MASK 0xffULL 83 #define ZIO_CHECKSUM_VERIFY (1 << 8) 84 85 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 86 #define ZIO_DEDUPDITTO_MIN 100 87 88 enum zio_compress { 89 ZIO_COMPRESS_INHERIT = 0, 90 ZIO_COMPRESS_ON, 91 ZIO_COMPRESS_OFF, 92 ZIO_COMPRESS_LZJB, 93 ZIO_COMPRESS_EMPTY, 94 ZIO_COMPRESS_GZIP_1, 95 ZIO_COMPRESS_GZIP_2, 96 ZIO_COMPRESS_GZIP_3, 97 ZIO_COMPRESS_GZIP_4, 98 ZIO_COMPRESS_GZIP_5, 99 ZIO_COMPRESS_GZIP_6, 100 ZIO_COMPRESS_GZIP_7, 101 ZIO_COMPRESS_GZIP_8, 102 ZIO_COMPRESS_GZIP_9, 103 ZIO_COMPRESS_ZLE, 104 ZIO_COMPRESS_FUNCTIONS 105 }; 106 107 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB 108 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 109 110 #define BOOTFS_COMPRESS_VALID(compress) \ 111 ((compress) == ZIO_COMPRESS_LZJB || \ 112 ((compress) == ZIO_COMPRESS_ON && \ 113 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \ 114 (compress) == ZIO_COMPRESS_OFF) 115 116 #define ZIO_FAILURE_MODE_WAIT 0 117 #define ZIO_FAILURE_MODE_CONTINUE 1 118 #define ZIO_FAILURE_MODE_PANIC 2 119 120 #define ZIO_PRIORITY_NOW (zio_priority_table[0]) 121 #define ZIO_PRIORITY_SYNC_READ (zio_priority_table[1]) 122 #define ZIO_PRIORITY_SYNC_WRITE (zio_priority_table[2]) 123 #define ZIO_PRIORITY_LOG_WRITE (zio_priority_table[3]) 124 #define ZIO_PRIORITY_CACHE_FILL (zio_priority_table[4]) 125 #define ZIO_PRIORITY_AGG (zio_priority_table[5]) 126 #define ZIO_PRIORITY_FREE (zio_priority_table[6]) 127 #define ZIO_PRIORITY_ASYNC_WRITE (zio_priority_table[7]) 128 #define ZIO_PRIORITY_ASYNC_READ (zio_priority_table[8]) 129 #define ZIO_PRIORITY_RESILVER (zio_priority_table[9]) 130 #define ZIO_PRIORITY_SCRUB (zio_priority_table[10]) 131 #define ZIO_PRIORITY_TABLE_SIZE 11 132 133 #define ZIO_PIPELINE_CONTINUE 0x100 134 #define ZIO_PIPELINE_STOP 0x101 135 136 enum zio_flag { 137 /* 138 * Flags inherited by gang, ddt, and vdev children, 139 * and that must be equal for two zios to aggregate 140 */ 141 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 142 ZIO_FLAG_IO_REPAIR = 1 << 1, 143 ZIO_FLAG_SELF_HEAL = 1 << 2, 144 ZIO_FLAG_RESILVER = 1 << 3, 145 ZIO_FLAG_SCRUB = 1 << 4, 146 ZIO_FLAG_SCRUB_THREAD = 1 << 5, 147 148 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 149 150 /* 151 * Flags inherited by ddt, gang, and vdev children. 152 */ 153 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */ 154 ZIO_FLAG_SPECULATIVE = 1 << 7, 155 ZIO_FLAG_CONFIG_WRITER = 1 << 8, 156 ZIO_FLAG_DONT_RETRY = 1 << 9, 157 ZIO_FLAG_DONT_CACHE = 1 << 10, 158 ZIO_FLAG_NODATA = 1 << 11, 159 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12, 160 161 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 162 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 163 164 /* 165 * Flags inherited by vdev children. 166 */ 167 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */ 168 ZIO_FLAG_PROBE = 1 << 14, 169 ZIO_FLAG_TRYHARD = 1 << 15, 170 ZIO_FLAG_OPTIONAL = 1 << 16, 171 172 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 173 174 /* 175 * Flags not inherited by any children. 176 */ 177 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */ 178 ZIO_FLAG_DONT_PROPAGATE = 1 << 18, 179 ZIO_FLAG_IO_BYPASS = 1 << 19, 180 ZIO_FLAG_IO_REWRITE = 1 << 20, 181 ZIO_FLAG_RAW = 1 << 21, 182 ZIO_FLAG_GANG_CHILD = 1 << 22, 183 ZIO_FLAG_DDT_CHILD = 1 << 23, 184 ZIO_FLAG_GODFATHER = 1 << 24 185 }; 186 187 #define ZIO_FLAG_MUSTSUCCEED 0 188 189 #define ZIO_DDT_CHILD_FLAGS(zio) \ 190 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 191 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 192 193 #define ZIO_GANG_CHILD_FLAGS(zio) \ 194 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 195 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 196 197 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 198 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 199 ZIO_FLAG_CANFAIL) 200 201 enum zio_child { 202 ZIO_CHILD_VDEV = 0, 203 ZIO_CHILD_GANG, 204 ZIO_CHILD_DDT, 205 ZIO_CHILD_LOGICAL, 206 ZIO_CHILD_TYPES 207 }; 208 209 enum zio_wait_type { 210 ZIO_WAIT_READY = 0, 211 ZIO_WAIT_DONE, 212 ZIO_WAIT_TYPES 213 }; 214 215 /* 216 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 217 * graveyard) to indicate checksum errors and fragmentation. 218 */ 219 #define ECKSUM EBADE 220 #define EFRAGS EBADR 221 222 typedef void zio_done_func_t(zio_t *zio); 223 224 extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE]; 225 extern char *zio_type_name[ZIO_TYPES]; 226 227 /* 228 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 229 * identifies any block in the pool. By convention, the meta-objset (MOS) 230 * is objset 0, and the meta-dnode is object 0. This covers all blocks 231 * except root blocks and ZIL blocks, which are defined as follows: 232 * 233 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 234 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 235 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 236 * 237 * Note: this structure is called a bookmark because its original purpose 238 * was to remember where to resume a pool-wide traverse. 239 * 240 * Note: this structure is passed between userland and the kernel. 241 * Therefore it must not change size or alignment between 32/64 bit 242 * compilation options. 243 */ 244 typedef struct zbookmark { 245 uint64_t zb_objset; 246 uint64_t zb_object; 247 int64_t zb_level; 248 uint64_t zb_blkid; 249 } zbookmark_t; 250 251 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 252 { \ 253 (zb)->zb_objset = objset; \ 254 (zb)->zb_object = object; \ 255 (zb)->zb_level = level; \ 256 (zb)->zb_blkid = blkid; \ 257 } 258 259 #define ZB_DESTROYED_OBJSET (-1ULL) 260 261 #define ZB_ROOT_OBJECT (0ULL) 262 #define ZB_ROOT_LEVEL (-1LL) 263 #define ZB_ROOT_BLKID (0ULL) 264 265 #define ZB_ZIL_OBJECT (0ULL) 266 #define ZB_ZIL_LEVEL (-2LL) 267 268 typedef struct zio_prop { 269 enum zio_checksum zp_checksum; 270 enum zio_compress zp_compress; 271 dmu_object_type_t zp_type; 272 uint8_t zp_level; 273 uint8_t zp_copies; 274 uint8_t zp_dedup; 275 uint8_t zp_dedup_verify; 276 } zio_prop_t; 277 278 typedef struct zio_cksum_report zio_cksum_report_t; 279 280 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 281 const void *good_data); 282 typedef void zio_cksum_free_f(void *cbdata, size_t size); 283 284 struct zio_bad_cksum; /* defined in zio_checksum.h */ 285 286 struct zio_cksum_report { 287 struct zio_cksum_report *zcr_next; 288 nvlist_t *zcr_ereport; 289 nvlist_t *zcr_detector; 290 void *zcr_cbdata; 291 size_t zcr_cbinfo; /* passed to zcr_free() */ 292 uint64_t zcr_align; 293 uint64_t zcr_length; 294 zio_cksum_finish_f *zcr_finish; 295 zio_cksum_free_f *zcr_free; 296 297 /* internal use only */ 298 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 299 }; 300 301 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 302 void *arg); 303 304 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 305 306 typedef struct zio_vsd_ops { 307 zio_done_func_t *vsd_free; 308 zio_vsd_cksum_report_f *vsd_cksum_report; 309 } zio_vsd_ops_t; 310 311 typedef struct zio_gang_node { 312 zio_gbh_phys_t *gn_gbh; 313 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 314 } zio_gang_node_t; 315 316 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 317 zio_gang_node_t *gn, void *data); 318 319 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 320 321 typedef struct zio_transform { 322 void *zt_orig_data; 323 uint64_t zt_orig_size; 324 uint64_t zt_bufsize; 325 zio_transform_func_t *zt_transform; 326 struct zio_transform *zt_next; 327 } zio_transform_t; 328 329 typedef int zio_pipe_stage_t(zio_t *zio); 330 331 /* 332 * The io_reexecute flags are distinct from io_flags because the child must 333 * be able to propagate them to the parent. The normal io_flags are local 334 * to the zio, not protected by any lock, and not modifiable by children; 335 * the reexecute flags are protected by io_lock, modifiable by children, 336 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 337 */ 338 #define ZIO_REEXECUTE_NOW 0x01 339 #define ZIO_REEXECUTE_SUSPEND 0x02 340 341 typedef struct zio_link { 342 zio_t *zl_parent; 343 zio_t *zl_child; 344 list_node_t zl_parent_node; 345 list_node_t zl_child_node; 346 } zio_link_t; 347 348 struct zio { 349 /* Core information about this I/O */ 350 zbookmark_t io_bookmark; 351 zio_prop_t io_prop; 352 zio_type_t io_type; 353 enum zio_child io_child_type; 354 int io_cmd; 355 uint8_t io_priority; 356 uint8_t io_reexecute; 357 uint8_t io_state[ZIO_WAIT_TYPES]; 358 uint64_t io_txg; 359 spa_t *io_spa; 360 blkptr_t *io_bp; 361 blkptr_t *io_bp_override; 362 blkptr_t io_bp_copy; 363 list_t io_parent_list; 364 list_t io_child_list; 365 zio_link_t *io_walk_link; 366 zio_t *io_logical; 367 zio_transform_t *io_transform_stack; 368 369 /* Callback info */ 370 zio_done_func_t *io_ready; 371 zio_done_func_t *io_done; 372 void *io_private; 373 int64_t io_prev_space_delta; /* DMU private */ 374 blkptr_t io_bp_orig; 375 376 /* Data represented by this I/O */ 377 void *io_data; 378 void *io_orig_data; 379 uint64_t io_size; 380 uint64_t io_orig_size; 381 382 /* Stuff for the vdev stack */ 383 vdev_t *io_vd; 384 void *io_vsd; 385 const zio_vsd_ops_t *io_vsd_ops; 386 387 uint64_t io_offset; 388 uint64_t io_deadline; 389 avl_node_t io_offset_node; 390 avl_node_t io_deadline_node; 391 avl_tree_t *io_vdev_tree; 392 393 /* Internal pipeline state */ 394 enum zio_flag io_flags; 395 enum zio_stage io_stage; 396 enum zio_stage io_pipeline; 397 enum zio_flag io_orig_flags; 398 enum zio_stage io_orig_stage; 399 enum zio_stage io_orig_pipeline; 400 int io_error; 401 int io_child_error[ZIO_CHILD_TYPES]; 402 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 403 uint64_t io_child_count; 404 uint64_t io_parent_count; 405 uint64_t *io_stall; 406 zio_t *io_gang_leader; 407 zio_gang_node_t *io_gang_tree; 408 void *io_executor; 409 void *io_waiter; 410 kmutex_t io_lock; 411 kcondvar_t io_cv; 412 413 /* FMA state */ 414 zio_cksum_report_t *io_cksum_report; 415 uint64_t io_ena; 416 }; 417 418 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 419 zio_done_func_t *done, void *private, enum zio_flag flags); 420 421 extern zio_t *zio_root(spa_t *spa, 422 zio_done_func_t *done, void *private, enum zio_flag flags); 423 424 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 425 uint64_t size, zio_done_func_t *done, void *private, 426 int priority, enum zio_flag flags, const zbookmark_t *zb); 427 428 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 429 void *data, uint64_t size, const zio_prop_t *zp, 430 zio_done_func_t *ready, zio_done_func_t *done, void *private, 431 int priority, enum zio_flag flags, const zbookmark_t *zb); 432 433 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 434 void *data, uint64_t size, zio_done_func_t *done, void *private, 435 int priority, enum zio_flag flags, zbookmark_t *zb); 436 437 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies); 438 439 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 440 441 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 442 const blkptr_t *bp, 443 zio_done_func_t *done, void *private, enum zio_flag flags); 444 445 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 446 zio_done_func_t *done, void *private, int priority, enum zio_flag flags); 447 448 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 449 uint64_t size, void *data, int checksum, 450 zio_done_func_t *done, void *private, int priority, enum zio_flag flags, 451 boolean_t labels); 452 453 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 454 uint64_t size, void *data, int checksum, 455 zio_done_func_t *done, void *private, int priority, enum zio_flag flags, 456 boolean_t labels); 457 458 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 459 const blkptr_t *bp, enum zio_flag flags); 460 461 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 462 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 463 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 464 extern void zio_flush(zio_t *zio, vdev_t *vd); 465 466 extern int zio_wait(zio_t *zio); 467 extern void zio_nowait(zio_t *zio); 468 extern void zio_execute(zio_t *zio); 469 extern void zio_interrupt(zio_t *zio); 470 471 extern zio_t *zio_walk_parents(zio_t *cio); 472 extern zio_t *zio_walk_children(zio_t *pio); 473 extern zio_t *zio_unique_parent(zio_t *cio); 474 extern void zio_add_child(zio_t *pio, zio_t *cio); 475 476 extern void *zio_buf_alloc(size_t size); 477 extern void zio_buf_free(void *buf, size_t size); 478 extern void *zio_data_buf_alloc(size_t size); 479 extern void zio_data_buf_free(void *buf, size_t size); 480 481 extern void zio_resubmit_stage_async(void *); 482 483 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 484 uint64_t offset, void *data, uint64_t size, int type, int priority, 485 enum zio_flag flags, zio_done_func_t *done, void *private); 486 487 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 488 void *data, uint64_t size, int type, int priority, 489 enum zio_flag flags, zio_done_func_t *done, void *private); 490 491 extern void zio_vdev_io_bypass(zio_t *zio); 492 extern void zio_vdev_io_reissue(zio_t *zio); 493 extern void zio_vdev_io_redone(zio_t *zio); 494 495 extern void zio_checksum_verified(zio_t *zio); 496 extern int zio_worst_error(int e1, int e2); 497 498 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 499 enum zio_checksum parent); 500 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 501 enum zio_checksum child, enum zio_checksum parent); 502 extern enum zio_compress zio_compress_select(enum zio_compress child, 503 enum zio_compress parent); 504 505 extern void zio_suspend(spa_t *spa, zio_t *zio); 506 extern int zio_resume(spa_t *spa); 507 extern void zio_resume_wait(spa_t *spa); 508 509 /* 510 * Initial setup and teardown. 511 */ 512 extern void zio_init(void); 513 extern void zio_fini(void); 514 515 /* 516 * Fault injection 517 */ 518 struct zinject_record; 519 extern uint32_t zio_injection_enabled; 520 extern int zio_inject_fault(char *name, int flags, int *id, 521 struct zinject_record *record); 522 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 523 struct zinject_record *record); 524 extern int zio_clear_fault(int id); 525 extern void zio_handle_panic_injection(spa_t *spa, char *tag); 526 extern int zio_handle_fault_injection(zio_t *zio, int error); 527 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 528 extern int zio_handle_label_injection(zio_t *zio, int error); 529 extern void zio_handle_ignored_writes(zio_t *zio); 530 531 /* 532 * Checksum ereport functions 533 */ 534 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 535 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 536 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 537 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 538 539 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 540 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 541 542 /* If we have the good data in hand, this function can be used */ 543 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 544 struct zio *zio, uint64_t offset, uint64_t length, 545 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 546 547 /* Called from spa_sync(), but primarily an injection handler */ 548 extern void spa_handle_ignored_writes(spa_t *spa); 549 550 #ifdef __cplusplus 551 } 552 #endif 553 554 #endif /* _ZIO_H */ 555