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, 2016 by Delphix. All rights reserved. 26 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 27 */ 28 29 #ifndef _ZIO_H 30 #define _ZIO_H 31 32 #include <sys/zio_priority.h> 33 #include <sys/zfs_context.h> 34 #include <sys/spa.h> 35 #include <sys/txg.h> 36 #include <sys/avl.h> 37 #include <sys/kstat.h> 38 #include <sys/fs/zfs.h> 39 #include <sys/zio_impl.h> 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 /* 46 * Embedded checksum 47 */ 48 #define ZEC_MAGIC 0x210da7ab10c7a11ULL 49 50 typedef struct zio_eck { 51 uint64_t zec_magic; /* for validation, endianness */ 52 zio_cksum_t zec_cksum; /* 256-bit checksum */ 53 } zio_eck_t; 54 55 /* 56 * Gang block headers are self-checksumming and contain an array 57 * of block pointers. 58 */ 59 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE 60 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ 61 sizeof (zio_eck_t)) / sizeof (blkptr_t)) 62 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ 63 sizeof (zio_eck_t) - \ 64 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\ 65 sizeof (uint64_t)) 66 67 typedef struct zio_gbh { 68 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; 69 uint64_t zg_filler[SPA_GBH_FILLER]; 70 zio_eck_t zg_tail; 71 } zio_gbh_phys_t; 72 73 enum zio_checksum { 74 ZIO_CHECKSUM_INHERIT = 0, 75 ZIO_CHECKSUM_ON, 76 ZIO_CHECKSUM_OFF, 77 ZIO_CHECKSUM_LABEL, 78 ZIO_CHECKSUM_GANG_HEADER, 79 ZIO_CHECKSUM_ZILOG, 80 ZIO_CHECKSUM_FLETCHER_2, 81 ZIO_CHECKSUM_FLETCHER_4, 82 ZIO_CHECKSUM_SHA256, 83 ZIO_CHECKSUM_ZILOG2, 84 ZIO_CHECKSUM_NOPARITY, 85 #ifdef illumos 86 ZIO_CHECKSUM_SHA512, 87 ZIO_CHECKSUM_SKEIN, 88 ZIO_CHECKSUM_EDONR, 89 #endif 90 ZIO_CHECKSUM_FUNCTIONS 91 }; 92 93 /* 94 * The number of "legacy" compression functions which can be set on individual 95 * objects. 96 */ 97 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2 98 99 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 100 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 101 102 #define ZIO_CHECKSUM_MASK 0xffULL 103 #define ZIO_CHECKSUM_VERIFY (1 << 8) 104 105 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 106 #define ZIO_DEDUPDITTO_MIN 100 107 108 enum zio_compress { 109 ZIO_COMPRESS_INHERIT = 0, 110 ZIO_COMPRESS_ON, 111 ZIO_COMPRESS_OFF, 112 ZIO_COMPRESS_LZJB, 113 ZIO_COMPRESS_EMPTY, 114 ZIO_COMPRESS_GZIP_1, 115 ZIO_COMPRESS_GZIP_2, 116 ZIO_COMPRESS_GZIP_3, 117 ZIO_COMPRESS_GZIP_4, 118 ZIO_COMPRESS_GZIP_5, 119 ZIO_COMPRESS_GZIP_6, 120 ZIO_COMPRESS_GZIP_7, 121 ZIO_COMPRESS_GZIP_8, 122 ZIO_COMPRESS_GZIP_9, 123 ZIO_COMPRESS_ZLE, 124 ZIO_COMPRESS_LZ4, 125 ZIO_COMPRESS_FUNCTIONS 126 }; 127 128 /* 129 * The number of "legacy" compression functions which can be set on individual 130 * objects. 131 */ 132 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4 133 134 /* 135 * The meaning of "compress = on" selected by the compression features enabled 136 * on a given pool. 137 */ 138 #define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB 139 #define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4 140 141 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 142 143 #define BOOTFS_COMPRESS_VALID(compress) \ 144 ((compress) == ZIO_COMPRESS_LZJB || \ 145 (compress) == ZIO_COMPRESS_LZ4 || \ 146 (compress) == ZIO_COMPRESS_ON || \ 147 (compress) == ZIO_COMPRESS_OFF) 148 149 #define ZIO_FAILURE_MODE_WAIT 0 150 #define ZIO_FAILURE_MODE_CONTINUE 1 151 #define ZIO_FAILURE_MODE_PANIC 2 152 153 enum zio_flag { 154 /* 155 * Flags inherited by gang, ddt, and vdev children, 156 * and that must be equal for two zios to aggregate 157 */ 158 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 159 ZIO_FLAG_IO_REPAIR = 1 << 1, 160 ZIO_FLAG_SELF_HEAL = 1 << 2, 161 ZIO_FLAG_RESILVER = 1 << 3, 162 ZIO_FLAG_SCRUB = 1 << 4, 163 ZIO_FLAG_SCAN_THREAD = 1 << 5, 164 ZIO_FLAG_PHYSICAL = 1 << 6, 165 166 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 167 168 /* 169 * Flags inherited by ddt, gang, and vdev children. 170 */ 171 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 172 ZIO_FLAG_SPECULATIVE = 1 << 8, 173 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 174 ZIO_FLAG_DONT_RETRY = 1 << 10, 175 ZIO_FLAG_DONT_CACHE = 1 << 11, 176 ZIO_FLAG_NODATA = 1 << 12, 177 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 178 ZIO_FLAG_IO_ALLOCATING = 1 << 14, 179 180 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 181 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 182 183 /* 184 * Flags inherited by vdev children. 185 */ 186 ZIO_FLAG_IO_RETRY = 1 << 15, /* must be first for INHERIT */ 187 ZIO_FLAG_PROBE = 1 << 16, 188 ZIO_FLAG_TRYHARD = 1 << 17, 189 ZIO_FLAG_OPTIONAL = 1 << 18, 190 191 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 192 193 /* 194 * Flags not inherited by any children. 195 */ 196 ZIO_FLAG_DONT_QUEUE = 1 << 19, /* must be first for INHERIT */ 197 ZIO_FLAG_DONT_PROPAGATE = 1 << 20, 198 ZIO_FLAG_IO_BYPASS = 1 << 21, 199 ZIO_FLAG_IO_REWRITE = 1 << 22, 200 ZIO_FLAG_RAW = 1 << 23, 201 ZIO_FLAG_GANG_CHILD = 1 << 24, 202 ZIO_FLAG_DDT_CHILD = 1 << 25, 203 ZIO_FLAG_GODFATHER = 1 << 26, 204 ZIO_FLAG_NOPWRITE = 1 << 27, 205 ZIO_FLAG_REEXECUTED = 1 << 28, 206 ZIO_FLAG_DELEGATED = 1 << 29, 207 }; 208 209 #define ZIO_FLAG_MUSTSUCCEED 0 210 211 #define ZIO_DDT_CHILD_FLAGS(zio) \ 212 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 213 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 214 215 #define ZIO_GANG_CHILD_FLAGS(zio) \ 216 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 217 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 218 219 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 220 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 221 ZIO_FLAG_CANFAIL) 222 223 #define ZIO_CHILD_BIT(x) (1 << (x)) 224 #define ZIO_CHILD_BIT_IS_SET(val, x) ((val) & (1 << (x))) 225 226 enum zio_child { 227 ZIO_CHILD_VDEV = 0, 228 ZIO_CHILD_GANG, 229 ZIO_CHILD_DDT, 230 ZIO_CHILD_LOGICAL, 231 ZIO_CHILD_TYPES 232 }; 233 234 #define ZIO_CHILD_VDEV_BIT ZIO_CHILD_BIT(ZIO_CHILD_VDEV) 235 #define ZIO_CHILD_GANG_BIT ZIO_CHILD_BIT(ZIO_CHILD_GANG) 236 #define ZIO_CHILD_DDT_BIT ZIO_CHILD_BIT(ZIO_CHILD_DDT) 237 #define ZIO_CHILD_LOGICAL_BIT ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL) 238 #define ZIO_CHILD_ALL_BITS \ 239 (ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT | \ 240 ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT) 241 242 enum zio_wait_type { 243 ZIO_WAIT_READY = 0, 244 ZIO_WAIT_DONE, 245 ZIO_WAIT_TYPES 246 }; 247 248 /* 249 * We'll take the number 122 and 123 to indicate checksum errors and 250 * fragmentation. Those doesn't collide with any errno values as they 251 * are greater than ELAST. 252 */ 253 #define ECKSUM 122 254 #define EFRAGS 123 255 256 typedef void zio_done_func_t(zio_t *zio); 257 258 extern boolean_t zio_dva_throttle_enabled; 259 extern const char *zio_type_name[ZIO_TYPES]; 260 261 /* 262 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 263 * identifies any block in the pool. By convention, the meta-objset (MOS) 264 * is objset 0, and the meta-dnode is object 0. This covers all blocks 265 * except root blocks and ZIL blocks, which are defined as follows: 266 * 267 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 268 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 269 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 270 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>. 271 * 272 * Note: this structure is called a bookmark because its original purpose 273 * was to remember where to resume a pool-wide traverse. 274 * 275 * Note: this structure is passed between userland and the kernel, and is 276 * stored on disk (by virtue of being incorporated into other on-disk 277 * structures, e.g. dsl_scan_phys_t). 278 */ 279 typedef struct zbookmark_phys { 280 uint64_t zb_objset; 281 uint64_t zb_object; 282 int64_t zb_level; 283 uint64_t zb_blkid; 284 } zbookmark_phys_t; 285 286 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 287 { \ 288 (zb)->zb_objset = objset; \ 289 (zb)->zb_object = object; \ 290 (zb)->zb_level = level; \ 291 (zb)->zb_blkid = blkid; \ 292 } 293 294 #define ZB_DESTROYED_OBJSET (-1ULL) 295 296 #define ZB_ROOT_OBJECT (0ULL) 297 #define ZB_ROOT_LEVEL (-1LL) 298 #define ZB_ROOT_BLKID (0ULL) 299 300 #define ZB_ZIL_OBJECT (0ULL) 301 #define ZB_ZIL_LEVEL (-2LL) 302 303 #define ZB_DNODE_LEVEL (-3LL) 304 #define ZB_DNODE_BLKID (0ULL) 305 306 #define ZB_IS_ZERO(zb) \ 307 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 308 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 309 #define ZB_IS_ROOT(zb) \ 310 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 311 (zb)->zb_level == ZB_ROOT_LEVEL && \ 312 (zb)->zb_blkid == ZB_ROOT_BLKID) 313 314 typedef struct zio_prop { 315 enum zio_checksum zp_checksum; 316 enum zio_compress zp_compress; 317 dmu_object_type_t zp_type; 318 uint8_t zp_level; 319 uint8_t zp_copies; 320 boolean_t zp_dedup; 321 boolean_t zp_dedup_verify; 322 boolean_t zp_nopwrite; 323 } zio_prop_t; 324 325 typedef struct zio_cksum_report zio_cksum_report_t; 326 327 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 328 const void *good_data); 329 typedef void zio_cksum_free_f(void *cbdata, size_t size); 330 331 struct zio_bad_cksum; /* defined in zio_checksum.h */ 332 struct dnode_phys; 333 334 struct zio_cksum_report { 335 struct zio_cksum_report *zcr_next; 336 nvlist_t *zcr_ereport; 337 nvlist_t *zcr_detector; 338 void *zcr_cbdata; 339 size_t zcr_cbinfo; /* passed to zcr_free() */ 340 uint64_t zcr_align; 341 uint64_t zcr_length; 342 zio_cksum_finish_f *zcr_finish; 343 zio_cksum_free_f *zcr_free; 344 345 /* internal use only */ 346 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 347 }; 348 349 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 350 void *arg); 351 352 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 353 354 typedef struct zio_vsd_ops { 355 zio_done_func_t *vsd_free; 356 zio_vsd_cksum_report_f *vsd_cksum_report; 357 } zio_vsd_ops_t; 358 359 typedef struct zio_gang_node { 360 zio_gbh_phys_t *gn_gbh; 361 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 362 } zio_gang_node_t; 363 364 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 365 zio_gang_node_t *gn, void *data); 366 367 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 368 369 typedef struct zio_transform { 370 void *zt_orig_data; 371 uint64_t zt_orig_size; 372 uint64_t zt_bufsize; 373 zio_transform_func_t *zt_transform; 374 struct zio_transform *zt_next; 375 } zio_transform_t; 376 377 typedef int zio_pipe_stage_t(zio_t *zio); 378 379 /* 380 * The io_reexecute flags are distinct from io_flags because the child must 381 * be able to propagate them to the parent. The normal io_flags are local 382 * to the zio, not protected by any lock, and not modifiable by children; 383 * the reexecute flags are protected by io_lock, modifiable by children, 384 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 385 */ 386 #define ZIO_REEXECUTE_NOW 0x01 387 #define ZIO_REEXECUTE_SUSPEND 0x02 388 389 typedef struct zio_link { 390 zio_t *zl_parent; 391 zio_t *zl_child; 392 list_node_t zl_parent_node; 393 list_node_t zl_child_node; 394 } zio_link_t; 395 396 /* 397 * Used for TRIM kstat. 398 */ 399 typedef struct zio_trim_stats { 400 /* 401 * Number of bytes successfully TRIMmed. 402 */ 403 kstat_named_t bytes; 404 405 /* 406 * Number of successful TRIM requests. 407 */ 408 kstat_named_t success; 409 410 /* 411 * Number of TRIM requests that failed because TRIM is not 412 * supported. 413 */ 414 kstat_named_t unsupported; 415 416 /* 417 * Number of TRIM requests that failed for other reasons. 418 */ 419 kstat_named_t failed; 420 } zio_trim_stats_t; 421 422 extern zio_trim_stats_t zio_trim_stats; 423 424 #define ZIO_TRIM_STAT_INCR(stat, val) \ 425 atomic_add_64(&zio_trim_stats.stat.value.ui64, (val)); 426 #define ZIO_TRIM_STAT_BUMP(stat) \ 427 ZIO_TRIM_STAT_INCR(stat, 1); 428 429 struct zio { 430 /* Core information about this I/O */ 431 zbookmark_phys_t io_bookmark; 432 zio_prop_t io_prop; 433 zio_type_t io_type; 434 enum zio_child io_child_type; 435 int io_cmd; 436 zio_priority_t io_priority; 437 uint8_t io_reexecute; 438 uint8_t io_state[ZIO_WAIT_TYPES]; 439 uint64_t io_txg; 440 spa_t *io_spa; 441 blkptr_t *io_bp; 442 blkptr_t *io_bp_override; 443 blkptr_t io_bp_copy; 444 list_t io_parent_list; 445 list_t io_child_list; 446 zio_t *io_logical; 447 zio_transform_t *io_transform_stack; 448 449 /* Callback info */ 450 zio_done_func_t *io_ready; 451 zio_done_func_t *io_children_ready; 452 zio_done_func_t *io_physdone; 453 zio_done_func_t *io_done; 454 void *io_private; 455 int64_t io_prev_space_delta; /* DMU private */ 456 blkptr_t io_bp_orig; 457 458 /* Data represented by this I/O */ 459 void *io_data; 460 void *io_orig_data; 461 uint64_t io_size; 462 uint64_t io_orig_size; 463 464 /* Stuff for the vdev stack */ 465 vdev_t *io_vd; 466 void *io_vsd; 467 const zio_vsd_ops_t *io_vsd_ops; 468 469 uint64_t io_offset; 470 hrtime_t io_timestamp; 471 hrtime_t io_queued_timestamp; 472 hrtime_t io_target_timestamp; 473 avl_node_t io_queue_node; 474 avl_node_t io_offset_node; 475 avl_node_t io_alloc_node; 476 477 /* Internal pipeline state */ 478 enum zio_flag io_flags; 479 enum zio_stage io_stage; 480 enum zio_stage io_pipeline; 481 enum zio_flag io_orig_flags; 482 enum zio_stage io_orig_stage; 483 enum zio_stage io_orig_pipeline; 484 enum zio_stage io_pipeline_trace; 485 int io_error; 486 int io_child_error[ZIO_CHILD_TYPES]; 487 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 488 uint64_t io_child_count; 489 uint64_t io_phys_children; 490 uint64_t io_parent_count; 491 uint64_t *io_stall; 492 zio_t *io_gang_leader; 493 zio_gang_node_t *io_gang_tree; 494 void *io_executor; 495 void *io_waiter; 496 kmutex_t io_lock; 497 kcondvar_t io_cv; 498 499 /* FMA state */ 500 zio_cksum_report_t *io_cksum_report; 501 uint64_t io_ena; 502 503 /* Taskq dispatching state */ 504 taskq_ent_t io_tqent; 505 506 avl_node_t io_trim_node; 507 list_node_t io_trim_link; 508 }; 509 510 extern int zio_timestamp_compare(const void *, const void *); 511 512 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 513 zio_done_func_t *done, void *priv, enum zio_flag flags); 514 515 extern zio_t *zio_root(spa_t *spa, 516 zio_done_func_t *done, void *priv, enum zio_flag flags); 517 518 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 519 uint64_t size, zio_done_func_t *done, void *priv, 520 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 521 522 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 523 void *data, uint64_t size, const zio_prop_t *zp, 524 zio_done_func_t *ready, zio_done_func_t *children_ready, 525 zio_done_func_t *physdone, zio_done_func_t *done, 526 void *priv, zio_priority_t priority, enum zio_flag flags, 527 const zbookmark_phys_t *zb); 528 529 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 530 void *data, uint64_t size, zio_done_func_t *done, void *priv, 531 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 532 533 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 534 boolean_t nopwrite); 535 536 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 537 538 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 539 const blkptr_t *bp, 540 zio_done_func_t *done, void *priv, enum zio_flag flags); 541 542 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 543 uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv, 544 zio_priority_t priority, enum zio_flag flags); 545 546 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 547 uint64_t size, void *data, int checksum, 548 zio_done_func_t *done, void *priv, zio_priority_t priority, 549 enum zio_flag flags, boolean_t labels); 550 551 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 552 uint64_t size, void *data, int checksum, 553 zio_done_func_t *done, void *priv, zio_priority_t priority, 554 enum zio_flag flags, boolean_t labels); 555 556 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 557 const blkptr_t *bp, uint64_t size, enum zio_flag flags); 558 559 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 560 blkptr_t *old_bp, uint64_t size, boolean_t *slog); 561 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 562 extern void zio_flush(zio_t *zio, vdev_t *vd); 563 extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset, 564 uint64_t size); 565 extern void zio_shrink(zio_t *zio, uint64_t size); 566 567 extern int zio_wait(zio_t *zio); 568 extern void zio_nowait(zio_t *zio); 569 extern void zio_execute(zio_t *zio); 570 extern void zio_interrupt(zio_t *zio); 571 extern void zio_delay_init(zio_t *zio); 572 extern void zio_delay_interrupt(zio_t *zio); 573 574 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **); 575 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **); 576 extern zio_t *zio_unique_parent(zio_t *cio); 577 extern void zio_add_child(zio_t *pio, zio_t *cio); 578 579 extern void *zio_buf_alloc(size_t size); 580 extern void *zio_buf_alloc_nowait(size_t size); 581 extern void zio_buf_free(void *buf, size_t size); 582 extern void *zio_data_buf_alloc(size_t size); 583 extern void zio_data_buf_free(void *buf, size_t size); 584 585 extern void zio_push_transform(zio_t *zio, void *data, uint64_t size, 586 uint64_t bufsize, zio_transform_func_t *transform); 587 extern void zio_pop_transforms(zio_t *zio); 588 589 extern void zio_resubmit_stage_async(void *); 590 591 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 592 uint64_t offset, void *data, uint64_t size, int type, 593 zio_priority_t priority, enum zio_flag flags, 594 zio_done_func_t *done, void *priv); 595 596 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 597 void *data, uint64_t size, int type, zio_priority_t priority, 598 enum zio_flag flags, zio_done_func_t *done, void *priv); 599 600 extern void zio_vdev_io_bypass(zio_t *zio); 601 extern void zio_vdev_io_reissue(zio_t *zio); 602 extern void zio_vdev_io_redone(zio_t *zio); 603 604 extern void zio_checksum_verified(zio_t *zio); 605 extern int zio_worst_error(int e1, int e2); 606 607 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 608 enum zio_checksum parent); 609 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 610 enum zio_checksum child, enum zio_checksum parent); 611 extern enum zio_compress zio_compress_select(spa_t *spa, 612 enum zio_compress child, enum zio_compress parent); 613 614 extern void zio_suspend(spa_t *spa, zio_t *zio); 615 extern int zio_resume(spa_t *spa); 616 extern void zio_resume_wait(spa_t *spa); 617 618 /* 619 * Initial setup and teardown. 620 */ 621 extern void zio_init(void); 622 extern void zio_fini(void); 623 624 /* 625 * Fault injection 626 */ 627 struct zinject_record; 628 extern uint32_t zio_injection_enabled; 629 extern int zio_inject_fault(char *name, int flags, int *id, 630 struct zinject_record *record); 631 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 632 struct zinject_record *record); 633 extern int zio_clear_fault(int id); 634 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 635 extern int zio_handle_fault_injection(zio_t *zio, int error); 636 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 637 extern int zio_handle_label_injection(zio_t *zio, int error); 638 extern void zio_handle_ignored_writes(zio_t *zio); 639 extern hrtime_t zio_handle_io_delay(zio_t *zio); 640 641 /* 642 * Checksum ereport functions 643 */ 644 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 645 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 646 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 647 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 648 649 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 650 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 651 652 /* If we have the good data in hand, this function can be used */ 653 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 654 struct zio *zio, uint64_t offset, uint64_t length, 655 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 656 657 /* Called from spa_sync(), but primarily an injection handler */ 658 extern void spa_handle_ignored_writes(spa_t *spa); 659 660 /* zbookmark_phys functions */ 661 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp, 662 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block); 663 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, 664 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 665 666 #ifdef __cplusplus 667 } 668 #endif 669 670 #endif /* _ZIO_H */ 671