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, 2018 by Delphix. All rights reserved. 26 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 27 * Copyright 2016 Toomas Soome <tsoome@me.com> 28 */ 29 30 #ifndef _ZIO_H 31 #define _ZIO_H 32 33 #include <sys/zio_priority.h> 34 #include <sys/zfs_context.h> 35 #include <sys/spa.h> 36 #include <sys/txg.h> 37 #include <sys/avl.h> 38 #include <sys/kstat.h> 39 #include <sys/fs/zfs.h> 40 #include <sys/zio_impl.h> 41 42 #ifdef __cplusplus 43 extern "C" { 44 #endif 45 46 /* 47 * Embedded checksum 48 */ 49 #define ZEC_MAGIC 0x210da7ab10c7a11ULL 50 51 typedef struct zio_eck { 52 uint64_t zec_magic; /* for validation, endianness */ 53 zio_cksum_t zec_cksum; /* 256-bit checksum */ 54 } zio_eck_t; 55 56 /* 57 * Gang block headers are self-checksumming and contain an array 58 * of block pointers. 59 */ 60 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE 61 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ 62 sizeof (zio_eck_t)) / sizeof (blkptr_t)) 63 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ 64 sizeof (zio_eck_t) - \ 65 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\ 66 sizeof (uint64_t)) 67 68 typedef struct zio_gbh { 69 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; 70 uint64_t zg_filler[SPA_GBH_FILLER]; 71 zio_eck_t zg_tail; 72 } zio_gbh_phys_t; 73 74 enum zio_checksum { 75 ZIO_CHECKSUM_INHERIT = 0, 76 ZIO_CHECKSUM_ON, 77 ZIO_CHECKSUM_OFF, 78 ZIO_CHECKSUM_LABEL, 79 ZIO_CHECKSUM_GANG_HEADER, 80 ZIO_CHECKSUM_ZILOG, 81 ZIO_CHECKSUM_FLETCHER_2, 82 ZIO_CHECKSUM_FLETCHER_4, 83 ZIO_CHECKSUM_SHA256, 84 ZIO_CHECKSUM_ZILOG2, 85 ZIO_CHECKSUM_NOPARITY, 86 ZIO_CHECKSUM_SHA512, 87 ZIO_CHECKSUM_SKEIN, 88 #ifdef illumos 89 ZIO_CHECKSUM_EDONR, 90 #endif 91 ZIO_CHECKSUM_FUNCTIONS 92 }; 93 94 /* 95 * The number of "legacy" compression functions which can be set on individual 96 * objects. 97 */ 98 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2 99 100 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 101 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 102 103 #define ZIO_CHECKSUM_MASK 0xffULL 104 #define ZIO_CHECKSUM_VERIFY (1 << 8) 105 106 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 107 #define ZIO_DEDUPDITTO_MIN 100 108 109 /* 110 * The number of "legacy" compression functions which can be set on individual 111 * objects. 112 */ 113 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4 114 115 /* 116 * The meaning of "compress = on" selected by the compression features enabled 117 * on a given pool. 118 */ 119 #define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB 120 #define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4 121 122 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 123 124 #define BOOTFS_COMPRESS_VALID(compress) \ 125 ((compress) == ZIO_COMPRESS_LZJB || \ 126 (compress) == ZIO_COMPRESS_LZ4 || \ 127 (compress) == ZIO_COMPRESS_ON || \ 128 (compress) == ZIO_COMPRESS_OFF) 129 130 #define ZIO_FAILURE_MODE_WAIT 0 131 #define ZIO_FAILURE_MODE_CONTINUE 1 132 #define ZIO_FAILURE_MODE_PANIC 2 133 134 typedef enum zio_suspend_reason { 135 ZIO_SUSPEND_NONE = 0, 136 ZIO_SUSPEND_IOERR, 137 ZIO_SUSPEND_MMP, 138 } zio_suspend_reason_t; 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_SCAN_THREAD = 1 << 5, 151 ZIO_FLAG_PHYSICAL = 1 << 6, 152 153 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 154 155 /* 156 * Flags inherited by ddt, gang, and vdev children. 157 */ 158 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 159 ZIO_FLAG_SPECULATIVE = 1 << 8, 160 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 161 ZIO_FLAG_DONT_RETRY = 1 << 10, 162 ZIO_FLAG_DONT_CACHE = 1 << 11, 163 ZIO_FLAG_NODATA = 1 << 12, 164 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 165 ZIO_FLAG_IO_ALLOCATING = 1 << 14, 166 167 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 168 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 169 170 /* 171 * Flags inherited by vdev children. 172 */ 173 ZIO_FLAG_IO_RETRY = 1 << 15, /* must be first for INHERIT */ 174 ZIO_FLAG_PROBE = 1 << 16, 175 ZIO_FLAG_TRYHARD = 1 << 17, 176 ZIO_FLAG_OPTIONAL = 1 << 18, 177 178 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 179 180 /* 181 * Flags not inherited by any children. 182 */ 183 ZIO_FLAG_DONT_QUEUE = 1 << 19, /* must be first for INHERIT */ 184 ZIO_FLAG_DONT_PROPAGATE = 1 << 20, 185 ZIO_FLAG_IO_BYPASS = 1 << 21, 186 ZIO_FLAG_IO_REWRITE = 1 << 22, 187 ZIO_FLAG_RAW = 1 << 23, 188 ZIO_FLAG_GANG_CHILD = 1 << 24, 189 ZIO_FLAG_DDT_CHILD = 1 << 25, 190 ZIO_FLAG_GODFATHER = 1 << 26, 191 ZIO_FLAG_NOPWRITE = 1 << 27, 192 ZIO_FLAG_REEXECUTED = 1 << 28, 193 ZIO_FLAG_DELEGATED = 1 << 29, 194 }; 195 196 #define ZIO_FLAG_MUSTSUCCEED 0 197 198 #define ZIO_DDT_CHILD_FLAGS(zio) \ 199 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 200 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 201 202 #define ZIO_GANG_CHILD_FLAGS(zio) \ 203 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 204 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 205 206 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 207 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 208 ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_CANFAIL) 209 210 #define ZIO_CHILD_BIT(x) (1 << (x)) 211 #define ZIO_CHILD_BIT_IS_SET(val, x) ((val) & (1 << (x))) 212 213 enum zio_child { 214 ZIO_CHILD_VDEV = 0, 215 ZIO_CHILD_GANG, 216 ZIO_CHILD_DDT, 217 ZIO_CHILD_LOGICAL, 218 ZIO_CHILD_TYPES 219 }; 220 221 #define ZIO_CHILD_VDEV_BIT ZIO_CHILD_BIT(ZIO_CHILD_VDEV) 222 #define ZIO_CHILD_GANG_BIT ZIO_CHILD_BIT(ZIO_CHILD_GANG) 223 #define ZIO_CHILD_DDT_BIT ZIO_CHILD_BIT(ZIO_CHILD_DDT) 224 #define ZIO_CHILD_LOGICAL_BIT ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL) 225 #define ZIO_CHILD_ALL_BITS \ 226 (ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT | \ 227 ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT) 228 229 enum zio_wait_type { 230 ZIO_WAIT_READY = 0, 231 ZIO_WAIT_DONE, 232 ZIO_WAIT_TYPES 233 }; 234 235 /* 236 * These are bespoke errnos used in ZFS. We map them to their closest FreeBSD 237 * equivalents. This gives us more useful error messages from strerror(3). 238 */ 239 #define ECKSUM EINTEGRITY 240 #define EFRAGS ENOSPC 241 242 typedef void zio_done_func_t(zio_t *zio); 243 244 extern boolean_t zio_dva_throttle_enabled; 245 extern const char *zio_type_name[ZIO_TYPES]; 246 247 /* 248 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 249 * identifies any block in the pool. By convention, the meta-objset (MOS) 250 * is objset 0, and the meta-dnode is object 0. This covers all blocks 251 * except root blocks and ZIL blocks, which are defined as follows: 252 * 253 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 254 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 255 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 256 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>. 257 * 258 * Note: this structure is called a bookmark because its original purpose 259 * was to remember where to resume a pool-wide traverse. 260 * 261 * Note: this structure is passed between userland and the kernel, and is 262 * stored on disk (by virtue of being incorporated into other on-disk 263 * structures, e.g. dsl_scan_phys_t). 264 */ 265 typedef struct zbookmark_phys { 266 uint64_t zb_objset; 267 uint64_t zb_object; 268 int64_t zb_level; 269 uint64_t zb_blkid; 270 } zbookmark_phys_t; 271 272 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 273 { \ 274 (zb)->zb_objset = objset; \ 275 (zb)->zb_object = object; \ 276 (zb)->zb_level = level; \ 277 (zb)->zb_blkid = blkid; \ 278 } 279 280 #define ZB_DESTROYED_OBJSET (-1ULL) 281 282 #define ZB_ROOT_OBJECT (0ULL) 283 #define ZB_ROOT_LEVEL (-1LL) 284 #define ZB_ROOT_BLKID (0ULL) 285 286 #define ZB_ZIL_OBJECT (0ULL) 287 #define ZB_ZIL_LEVEL (-2LL) 288 289 #define ZB_DNODE_LEVEL (-3LL) 290 #define ZB_DNODE_BLKID (0ULL) 291 292 #define ZB_IS_ZERO(zb) \ 293 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 294 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 295 #define ZB_IS_ROOT(zb) \ 296 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 297 (zb)->zb_level == ZB_ROOT_LEVEL && \ 298 (zb)->zb_blkid == ZB_ROOT_BLKID) 299 300 typedef struct zio_prop { 301 enum zio_checksum zp_checksum; 302 enum zio_compress zp_compress; 303 dmu_object_type_t zp_type; 304 uint8_t zp_level; 305 uint8_t zp_copies; 306 boolean_t zp_dedup; 307 boolean_t zp_dedup_verify; 308 boolean_t zp_nopwrite; 309 uint32_t zp_zpl_smallblk; 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 struct abd; 321 322 struct zio_cksum_report { 323 struct zio_cksum_report *zcr_next; 324 nvlist_t *zcr_ereport; 325 nvlist_t *zcr_detector; 326 void *zcr_cbdata; 327 size_t zcr_cbinfo; /* passed to zcr_free() */ 328 uint64_t zcr_align; 329 uint64_t zcr_length; 330 zio_cksum_finish_f *zcr_finish; 331 zio_cksum_free_f *zcr_free; 332 333 /* internal use only */ 334 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 335 }; 336 337 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 338 void *arg); 339 340 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 341 342 typedef struct zio_vsd_ops { 343 zio_done_func_t *vsd_free; 344 zio_vsd_cksum_report_f *vsd_cksum_report; 345 } zio_vsd_ops_t; 346 347 typedef struct zio_gang_node { 348 zio_gbh_phys_t *gn_gbh; 349 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 350 } zio_gang_node_t; 351 352 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 353 zio_gang_node_t *gn, struct abd *data, uint64_t offset); 354 355 typedef void zio_transform_func_t(zio_t *zio, struct abd *data, uint64_t size); 356 357 typedef struct zio_transform { 358 struct abd *zt_orig_abd; 359 uint64_t zt_orig_size; 360 uint64_t zt_bufsize; 361 zio_transform_func_t *zt_transform; 362 struct zio_transform *zt_next; 363 } zio_transform_t; 364 365 typedef zio_t *zio_pipe_stage_t(zio_t *zio); 366 367 /* 368 * The io_reexecute flags are distinct from io_flags because the child must 369 * be able to propagate them to the parent. The normal io_flags are local 370 * to the zio, not protected by any lock, and not modifiable by children; 371 * the reexecute flags are protected by io_lock, modifiable by children, 372 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 373 */ 374 #define ZIO_REEXECUTE_NOW 0x01 375 #define ZIO_REEXECUTE_SUSPEND 0x02 376 377 typedef struct zio_alloc_list { 378 list_t zal_list; 379 uint64_t zal_size; 380 } zio_alloc_list_t; 381 382 typedef struct zio_link { 383 zio_t *zl_parent; 384 zio_t *zl_child; 385 list_node_t zl_parent_node; 386 list_node_t zl_child_node; 387 } zio_link_t; 388 389 /* 390 * Used for TRIM kstat. 391 */ 392 typedef struct zio_trim_stats { 393 /* 394 * Number of bytes successfully TRIMmed. 395 */ 396 kstat_named_t bytes; 397 398 /* 399 * Number of successful TRIM requests. 400 */ 401 kstat_named_t success; 402 403 /* 404 * Number of TRIM requests that failed because TRIM is not 405 * supported. 406 */ 407 kstat_named_t unsupported; 408 409 /* 410 * Number of TRIM requests that failed for other reasons. 411 */ 412 kstat_named_t failed; 413 } zio_trim_stats_t; 414 415 extern zio_trim_stats_t zio_trim_stats; 416 417 #define ZIO_TRIM_STAT_INCR(stat, val) \ 418 atomic_add_64(&zio_trim_stats.stat.value.ui64, (val)); 419 #define ZIO_TRIM_STAT_BUMP(stat) \ 420 ZIO_TRIM_STAT_INCR(stat, 1); 421 422 struct zio { 423 /* Core information about this I/O */ 424 zbookmark_phys_t io_bookmark; 425 zio_prop_t io_prop; 426 zio_type_t io_type; 427 enum zio_child io_child_type; 428 int io_cmd; 429 zio_priority_t io_priority; 430 uint8_t io_reexecute; 431 uint8_t io_state[ZIO_WAIT_TYPES]; 432 uint64_t io_txg; 433 spa_t *io_spa; 434 blkptr_t *io_bp; 435 blkptr_t *io_bp_override; 436 blkptr_t io_bp_copy; 437 list_t io_parent_list; 438 list_t io_child_list; 439 zio_t *io_logical; 440 zio_transform_t *io_transform_stack; 441 442 /* Callback info */ 443 zio_done_func_t *io_ready; 444 zio_done_func_t *io_children_ready; 445 zio_done_func_t *io_physdone; 446 zio_done_func_t *io_done; 447 void *io_private; 448 int64_t io_prev_space_delta; /* DMU private */ 449 blkptr_t io_bp_orig; 450 451 /* Data represented by this I/O */ 452 struct abd *io_abd; 453 struct abd *io_orig_abd; 454 uint64_t io_size; 455 uint64_t io_orig_size; 456 /* io_lsize != io_orig_size iff this is a raw write */ 457 uint64_t io_lsize; 458 459 /* Stuff for the vdev stack */ 460 vdev_t *io_vd; 461 void *io_vsd; 462 const zio_vsd_ops_t *io_vsd_ops; 463 metaslab_class_t *io_metaslab_class; /* dva throttle class */ 464 465 uint64_t io_offset; 466 hrtime_t io_timestamp; 467 hrtime_t io_queued_timestamp; 468 hrtime_t io_target_timestamp; 469 avl_node_t io_queue_node; 470 avl_node_t io_offset_node; 471 avl_node_t io_alloc_node; 472 zio_alloc_list_t io_alloc_list; 473 474 #ifdef __FreeBSD__ 475 struct bio *io_bio; 476 #endif 477 478 /* Internal pipeline state */ 479 enum zio_flag io_flags; 480 enum zio_stage io_stage; 481 enum zio_stage io_pipeline; 482 enum zio_flag io_orig_flags; 483 enum zio_stage io_orig_stage; 484 enum zio_stage io_orig_pipeline; 485 enum zio_stage io_pipeline_trace; 486 int io_error; 487 int io_child_error[ZIO_CHILD_TYPES]; 488 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 489 uint64_t io_child_count; 490 uint64_t io_phys_children; 491 uint64_t io_parent_count; 492 uint64_t *io_stall; 493 zio_t *io_gang_leader; 494 zio_gang_node_t *io_gang_tree; 495 void *io_executor; 496 void *io_waiter; 497 kmutex_t io_lock; 498 kcondvar_t io_cv; 499 int io_allocator; 500 501 /* FMA state */ 502 zio_cksum_report_t *io_cksum_report; 503 uint64_t io_ena; 504 505 /* Taskq dispatching state */ 506 taskq_ent_t io_tqent; 507 508 avl_node_t io_trim_node; 509 list_node_t io_trim_link; 510 }; 511 512 extern int zio_bookmark_compare(const void *, const void *); 513 514 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 515 zio_done_func_t *done, void *priv, enum zio_flag flags); 516 517 extern zio_t *zio_root(spa_t *spa, 518 zio_done_func_t *done, void *priv, enum zio_flag flags); 519 520 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 521 struct abd *data, uint64_t lsize, zio_done_func_t *done, void *priv, 522 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 523 524 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 525 struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp, 526 zio_done_func_t *ready, zio_done_func_t *children_ready, 527 zio_done_func_t *physdone, zio_done_func_t *done, 528 void *priv, zio_priority_t priority, enum zio_flag flags, 529 const zbookmark_phys_t *zb); 530 531 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 532 struct abd *data, uint64_t size, zio_done_func_t *done, void *priv, 533 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 534 535 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 536 boolean_t nopwrite); 537 538 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 539 540 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 541 const blkptr_t *bp, 542 zio_done_func_t *done, void *priv, enum zio_flag flags); 543 544 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 545 uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv, 546 zio_priority_t priority, enum zio_flag flags); 547 548 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 549 uint64_t size, struct abd *data, int checksum, 550 zio_done_func_t *done, void *priv, zio_priority_t priority, 551 enum zio_flag flags, boolean_t labels); 552 553 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 554 uint64_t size, struct abd *data, int checksum, 555 zio_done_func_t *done, void *priv, zio_priority_t priority, 556 enum zio_flag flags, boolean_t labels); 557 558 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 559 const blkptr_t *bp, uint64_t size, enum zio_flag flags); 560 561 extern int zio_alloc_zil(spa_t *spa, uint64_t objset, uint64_t txg, 562 blkptr_t *new_bp, blkptr_t *old_bp, uint64_t size, boolean_t *slog); 563 extern void zio_flush(zio_t *zio, vdev_t *vd); 564 extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset, 565 uint64_t size); 566 extern void zio_shrink(zio_t *zio, uint64_t size); 567 568 extern int zio_wait(zio_t *zio); 569 extern void zio_nowait(zio_t *zio); 570 extern void zio_execute(zio_t *zio); 571 extern void zio_interrupt(zio_t *zio); 572 extern void zio_delay_init(zio_t *zio); 573 extern void zio_delay_interrupt(zio_t *zio); 574 575 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **); 576 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **); 577 extern zio_t *zio_unique_parent(zio_t *cio); 578 extern void zio_add_child(zio_t *pio, zio_t *cio); 579 580 extern void *zio_buf_alloc(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, struct abd *abd, 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, struct abd *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 struct abd *data, uint64_t size, zio_type_t 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_change_priority(zio_t *pio, zio_priority_t priority); 605 606 extern void zio_checksum_verified(zio_t *zio); 607 extern int zio_worst_error(int e1, int e2); 608 609 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 610 enum zio_checksum parent); 611 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 612 enum zio_checksum child, enum zio_checksum parent); 613 extern enum zio_compress zio_compress_select(spa_t *spa, 614 enum zio_compress child, enum zio_compress parent); 615 616 extern void zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t); 617 extern int zio_resume(spa_t *spa); 618 extern void zio_resume_wait(spa_t *spa); 619 620 /* 621 * Initial setup and teardown. 622 */ 623 extern void zio_init(void); 624 extern void zio_fini(void); 625 626 /* 627 * Fault injection 628 */ 629 struct zinject_record; 630 extern uint32_t zio_injection_enabled; 631 extern int zio_inject_fault(char *name, int flags, int *id, 632 struct zinject_record *record); 633 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 634 struct zinject_record *record); 635 extern int zio_clear_fault(int id); 636 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 637 extern int zio_handle_fault_injection(zio_t *zio, int error); 638 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 639 extern int zio_handle_label_injection(zio_t *zio, int error); 640 extern void zio_handle_ignored_writes(zio_t *zio); 641 extern hrtime_t zio_handle_io_delay(zio_t *zio); 642 643 /* 644 * Checksum ereport functions 645 */ 646 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 647 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 648 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 649 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 650 651 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 652 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 653 654 /* If we have the good data in hand, this function can be used */ 655 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 656 struct zio *zio, uint64_t offset, uint64_t length, 657 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 658 659 /* Called from spa_sync(), but primarily an injection handler */ 660 extern void spa_handle_ignored_writes(spa_t *spa); 661 662 /* zbookmark_phys functions */ 663 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp, 664 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block); 665 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, 666 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 667 668 #ifdef __cplusplus 669 } 670 #endif 671 672 #endif /* _ZIO_H */ 673