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 * Copyright 2016 Toomas Soome <tsoome (at) 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 #ifndef __NetBSD__ 87 ZIO_CHECKSUM_SHA512, 88 ZIO_CHECKSUM_SKEIN, 89 #endif 90 #ifdef illumos 91 ZIO_CHECKSUM_EDONR, 92 #endif 93 ZIO_CHECKSUM_FUNCTIONS 94 }; 95 96 /* 97 * The number of "legacy" compression functions which can be set on individual 98 * objects. 99 */ 100 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2 101 102 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 103 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 104 105 #define ZIO_CHECKSUM_MASK 0xffULL 106 #define ZIO_CHECKSUM_VERIFY (1 << 8) 107 108 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 109 #define ZIO_DEDUPDITTO_MIN 100 110 111 enum zio_compress { 112 ZIO_COMPRESS_INHERIT = 0, 113 ZIO_COMPRESS_ON, 114 ZIO_COMPRESS_OFF, 115 ZIO_COMPRESS_LZJB, 116 ZIO_COMPRESS_EMPTY, 117 ZIO_COMPRESS_GZIP_1, 118 ZIO_COMPRESS_GZIP_2, 119 ZIO_COMPRESS_GZIP_3, 120 ZIO_COMPRESS_GZIP_4, 121 ZIO_COMPRESS_GZIP_5, 122 ZIO_COMPRESS_GZIP_6, 123 ZIO_COMPRESS_GZIP_7, 124 ZIO_COMPRESS_GZIP_8, 125 ZIO_COMPRESS_GZIP_9, 126 ZIO_COMPRESS_ZLE, 127 ZIO_COMPRESS_LZ4, 128 ZIO_COMPRESS_FUNCTIONS 129 }; 130 131 /* 132 * The number of "legacy" compression functions which can be set on individual 133 * objects. 134 */ 135 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4 136 137 /* 138 * The meaning of "compress = on" selected by the compression features enabled 139 * on a given pool. 140 */ 141 #define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB 142 #define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4 143 144 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 145 146 #define BOOTFS_COMPRESS_VALID(compress) \ 147 ((compress) == ZIO_COMPRESS_LZJB || \ 148 (compress) == ZIO_COMPRESS_LZ4 || \ 149 (compress) == ZIO_COMPRESS_ON || \ 150 (compress) == ZIO_COMPRESS_OFF) 151 152 #define ZIO_FAILURE_MODE_WAIT 0 153 #define ZIO_FAILURE_MODE_CONTINUE 1 154 #define ZIO_FAILURE_MODE_PANIC 2 155 156 enum zio_flag { 157 /* 158 * Flags inherited by gang, ddt, and vdev children, 159 * and that must be equal for two zios to aggregate 160 */ 161 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 162 ZIO_FLAG_IO_REPAIR = 1 << 1, 163 ZIO_FLAG_SELF_HEAL = 1 << 2, 164 ZIO_FLAG_RESILVER = 1 << 3, 165 ZIO_FLAG_SCRUB = 1 << 4, 166 ZIO_FLAG_SCAN_THREAD = 1 << 5, 167 ZIO_FLAG_PHYSICAL = 1 << 6, 168 169 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 170 171 /* 172 * Flags inherited by ddt, gang, and vdev children. 173 */ 174 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 175 ZIO_FLAG_SPECULATIVE = 1 << 8, 176 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 177 ZIO_FLAG_DONT_RETRY = 1 << 10, 178 ZIO_FLAG_DONT_CACHE = 1 << 11, 179 ZIO_FLAG_NODATA = 1 << 12, 180 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 181 ZIO_FLAG_IO_ALLOCATING = 1 << 14, 182 183 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 184 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 185 186 /* 187 * Flags inherited by vdev children. 188 */ 189 ZIO_FLAG_IO_RETRY = 1 << 15, /* must be first for INHERIT */ 190 ZIO_FLAG_PROBE = 1 << 16, 191 ZIO_FLAG_TRYHARD = 1 << 17, 192 ZIO_FLAG_OPTIONAL = 1 << 18, 193 194 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 195 196 /* 197 * Flags not inherited by any children. 198 */ 199 ZIO_FLAG_DONT_QUEUE = 1 << 19, /* must be first for INHERIT */ 200 ZIO_FLAG_DONT_PROPAGATE = 1 << 20, 201 ZIO_FLAG_IO_BYPASS = 1 << 21, 202 ZIO_FLAG_IO_REWRITE = 1 << 22, 203 ZIO_FLAG_RAW = 1 << 23, 204 ZIO_FLAG_GANG_CHILD = 1 << 24, 205 ZIO_FLAG_DDT_CHILD = 1 << 25, 206 ZIO_FLAG_GODFATHER = 1 << 26, 207 ZIO_FLAG_NOPWRITE = 1 << 27, 208 ZIO_FLAG_REEXECUTED = 1 << 28, 209 ZIO_FLAG_DELEGATED = 1 << 29, 210 }; 211 212 #define ZIO_FLAG_MUSTSUCCEED 0 213 214 #define ZIO_DDT_CHILD_FLAGS(zio) \ 215 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 216 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 217 218 #define ZIO_GANG_CHILD_FLAGS(zio) \ 219 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 220 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 221 222 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 223 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 224 ZIO_FLAG_CANFAIL) 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 enum zio_wait_type { 235 ZIO_WAIT_READY = 0, 236 ZIO_WAIT_DONE, 237 ZIO_WAIT_TYPES 238 }; 239 240 /* 241 * We'll take the number 122 and 123 to indicate checksum errors and 242 * fragmentation. Those doesn't collide with any errno values as they 243 * are greater than ELAST. 244 */ 245 #define ECKSUM 122 246 #define EFRAGS 123 247 248 typedef void zio_done_func_t(zio_t *zio); 249 250 extern boolean_t zio_dva_throttle_enabled; 251 extern const char *zio_type_name[ZIO_TYPES]; 252 253 /* 254 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 255 * identifies any block in the pool. By convention, the meta-objset (MOS) 256 * is objset 0, and the meta-dnode is object 0. This covers all blocks 257 * except root blocks and ZIL blocks, which are defined as follows: 258 * 259 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 260 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 261 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 262 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>. 263 * 264 * Note: this structure is called a bookmark because its original purpose 265 * was to remember where to resume a pool-wide traverse. 266 * 267 * Note: this structure is passed between userland and the kernel, and is 268 * stored on disk (by virtue of being incorporated into other on-disk 269 * structures, e.g. dsl_scan_phys_t). 270 */ 271 typedef struct zbookmark_phys { 272 uint64_t zb_objset; 273 uint64_t zb_object; 274 int64_t zb_level; 275 uint64_t zb_blkid; 276 } zbookmark_phys_t; 277 278 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 279 { \ 280 (zb)->zb_objset = objset; \ 281 (zb)->zb_object = object; \ 282 (zb)->zb_level = level; \ 283 (zb)->zb_blkid = blkid; \ 284 } 285 286 #define ZB_DESTROYED_OBJSET (-1ULL) 287 288 #define ZB_ROOT_OBJECT (0ULL) 289 #define ZB_ROOT_LEVEL (-1LL) 290 #define ZB_ROOT_BLKID (0ULL) 291 292 #define ZB_ZIL_OBJECT (0ULL) 293 #define ZB_ZIL_LEVEL (-2LL) 294 295 #define ZB_DNODE_LEVEL (-3LL) 296 #define ZB_DNODE_BLKID (0ULL) 297 298 #define ZB_IS_ZERO(zb) \ 299 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 300 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 301 #define ZB_IS_ROOT(zb) \ 302 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 303 (zb)->zb_level == ZB_ROOT_LEVEL && \ 304 (zb)->zb_blkid == ZB_ROOT_BLKID) 305 306 typedef struct zio_prop { 307 enum zio_checksum zp_checksum; 308 enum zio_compress zp_compress; 309 dmu_object_type_t zp_type; 310 uint8_t zp_level; 311 uint8_t zp_copies; 312 boolean_t zp_dedup; 313 boolean_t zp_dedup_verify; 314 boolean_t zp_nopwrite; 315 } zio_prop_t; 316 317 typedef struct zio_cksum_report zio_cksum_report_t; 318 319 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 320 const void *good_data); 321 typedef void zio_cksum_free_f(void *cbdata, size_t size); 322 323 struct zio_bad_cksum; /* defined in zio_checksum.h */ 324 struct dnode_phys; 325 326 struct zio_cksum_report { 327 struct zio_cksum_report *zcr_next; 328 nvlist_t *zcr_ereport; 329 nvlist_t *zcr_detector; 330 void *zcr_cbdata; 331 size_t zcr_cbinfo; /* passed to zcr_free() */ 332 uint64_t zcr_align; 333 uint64_t zcr_length; 334 zio_cksum_finish_f *zcr_finish; 335 zio_cksum_free_f *zcr_free; 336 337 /* internal use only */ 338 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 339 }; 340 341 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 342 void *arg); 343 344 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 345 346 typedef struct zio_vsd_ops { 347 zio_done_func_t *vsd_free; 348 zio_vsd_cksum_report_f *vsd_cksum_report; 349 } zio_vsd_ops_t; 350 351 typedef struct zio_gang_node { 352 zio_gbh_phys_t *gn_gbh; 353 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 354 } zio_gang_node_t; 355 356 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 357 zio_gang_node_t *gn, void *data); 358 359 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 360 361 typedef struct zio_transform { 362 void *zt_orig_data; 363 uint64_t zt_orig_size; 364 uint64_t zt_bufsize; 365 zio_transform_func_t *zt_transform; 366 struct zio_transform *zt_next; 367 } zio_transform_t; 368 369 typedef int zio_pipe_stage_t(zio_t *zio); 370 371 /* 372 * The io_reexecute flags are distinct from io_flags because the child must 373 * be able to propagate them to the parent. The normal io_flags are local 374 * to the zio, not protected by any lock, and not modifiable by children; 375 * the reexecute flags are protected by io_lock, modifiable by children, 376 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 377 */ 378 #define ZIO_REEXECUTE_NOW 0x01 379 #define ZIO_REEXECUTE_SUSPEND 0x02 380 381 typedef struct zio_alloc_list { 382 list_t zal_list; 383 uint64_t zal_size; 384 } zio_alloc_list_t; 385 386 typedef struct zio_link { 387 zio_t *zl_parent; 388 zio_t *zl_child; 389 list_node_t zl_parent_node; 390 list_node_t zl_child_node; 391 } zio_link_t; 392 393 /* 394 * Used for TRIM kstat. 395 */ 396 typedef struct zio_trim_stats { 397 /* 398 * Number of bytes successfully TRIMmed. 399 */ 400 kstat_named_t bytes; 401 402 /* 403 * Number of successful TRIM requests. 404 */ 405 kstat_named_t success; 406 407 /* 408 * Number of TRIM requests that failed because TRIM is not 409 * supported. 410 */ 411 kstat_named_t unsupported; 412 413 /* 414 * Number of TRIM requests that failed for other reasons. 415 */ 416 kstat_named_t failed; 417 } zio_trim_stats_t; 418 419 extern zio_trim_stats_t zio_trim_stats; 420 421 #define ZIO_TRIM_STAT_INCR(stat, val) \ 422 atomic_add_64(&zio_trim_stats.stat.value.ui64, (val)); 423 #define ZIO_TRIM_STAT_BUMP(stat) \ 424 ZIO_TRIM_STAT_INCR(stat, 1); 425 426 struct zio { 427 /* Core information about this I/O */ 428 zbookmark_phys_t io_bookmark; 429 zio_prop_t io_prop; 430 zio_type_t io_type; 431 enum zio_child io_child_type; 432 int io_cmd; 433 zio_priority_t io_priority; 434 uint8_t io_reexecute; 435 uint8_t io_state[ZIO_WAIT_TYPES]; 436 uint64_t io_txg; 437 spa_t *io_spa; 438 blkptr_t *io_bp; 439 blkptr_t *io_bp_override; 440 blkptr_t io_bp_copy; 441 list_t io_parent_list; 442 list_t io_child_list; 443 zio_t *io_logical; 444 zio_transform_t *io_transform_stack; 445 446 /* Callback info */ 447 zio_done_func_t *io_ready; 448 zio_done_func_t *io_children_ready; 449 zio_done_func_t *io_physdone; 450 zio_done_func_t *io_done; 451 void *io_private; 452 int64_t io_prev_space_delta; /* DMU private */ 453 blkptr_t io_bp_orig; 454 455 /* Data represented by this I/O */ 456 void *io_data; 457 void *io_orig_data; 458 uint64_t io_size; 459 uint64_t io_orig_size; 460 461 /* Stuff for the vdev stack */ 462 vdev_t *io_vd; 463 void *io_vsd; 464 const zio_vsd_ops_t *io_vsd_ops; 465 466 uint64_t io_offset; 467 hrtime_t io_timestamp; 468 hrtime_t io_queued_timestamp; 469 hrtime_t io_target_timestamp; 470 avl_node_t io_queue_node; 471 avl_node_t io_offset_node; 472 avl_node_t io_alloc_node; 473 zio_alloc_list_t io_alloc_list; 474 475 /* Internal pipeline state */ 476 enum zio_flag io_flags; 477 enum zio_stage io_stage; 478 enum zio_stage io_pipeline; 479 enum zio_flag io_orig_flags; 480 enum zio_stage io_orig_stage; 481 enum zio_stage io_orig_pipeline; 482 enum zio_stage io_pipeline_trace; 483 int io_error; 484 int io_child_error[ZIO_CHILD_TYPES]; 485 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 486 uint64_t io_child_count; 487 uint64_t io_phys_children; 488 uint64_t io_parent_count; 489 uint64_t *io_stall; 490 zio_t *io_gang_leader; 491 zio_gang_node_t *io_gang_tree; 492 void *io_executor; 493 void *io_waiter; 494 kmutex_t io_lock; 495 kcondvar_t io_cv; 496 497 /* FMA state */ 498 zio_cksum_report_t *io_cksum_report; 499 uint64_t io_ena; 500 501 /* Taskq dispatching state */ 502 taskq_ent_t io_tqent; 503 504 avl_node_t io_trim_node; 505 list_node_t io_trim_link; 506 }; 507 508 extern int zio_timestamp_compare(const void *, const void *); 509 510 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 511 zio_done_func_t *done, void *priv, enum zio_flag flags); 512 513 extern zio_t *zio_root(spa_t *spa, 514 zio_done_func_t *done, void *priv, enum zio_flag flags); 515 516 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 517 uint64_t size, zio_done_func_t *done, void *priv, 518 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 519 520 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 521 void *data, uint64_t size, const zio_prop_t *zp, 522 zio_done_func_t *ready, zio_done_func_t *children_ready, 523 zio_done_func_t *physdone, zio_done_func_t *done, 524 void *priv, zio_priority_t priority, enum zio_flag flags, 525 const zbookmark_phys_t *zb); 526 527 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 528 void *data, uint64_t size, zio_done_func_t *done, void *priv, 529 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 530 531 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 532 boolean_t nopwrite); 533 534 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 535 536 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 537 const blkptr_t *bp, 538 zio_done_func_t *done, void *priv, enum zio_flag flags); 539 540 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 541 uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv, 542 zio_priority_t priority, enum zio_flag flags); 543 544 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 545 uint64_t size, void *data, int checksum, 546 zio_done_func_t *done, void *priv, zio_priority_t priority, 547 enum zio_flag flags, boolean_t labels); 548 549 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 550 uint64_t size, void *data, int checksum, 551 zio_done_func_t *done, void *priv, zio_priority_t priority, 552 enum zio_flag flags, boolean_t labels); 553 554 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 555 const blkptr_t *bp, uint64_t size, enum zio_flag flags); 556 557 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 558 blkptr_t *old_bp, uint64_t size, boolean_t *slog); 559 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 560 extern void zio_flush(zio_t *zio, vdev_t *vd); 561 extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset, 562 uint64_t size); 563 extern void zio_shrink(zio_t *zio, uint64_t size); 564 565 extern int zio_wait(zio_t *zio); 566 extern void zio_nowait(zio_t *zio); 567 extern void zio_execute(zio_t *zio); 568 extern void zio_interrupt(zio_t *zio); 569 extern void zio_delay_init(zio_t *zio); 570 extern void zio_delay_interrupt(zio_t *zio); 571 572 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **); 573 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **); 574 extern zio_t *zio_unique_parent(zio_t *cio); 575 extern void zio_add_child(zio_t *pio, zio_t *cio); 576 577 extern void *zio_buf_alloc(size_t size); 578 extern void *zio_buf_alloc_nowait(size_t size); 579 extern void zio_buf_free(void *buf, size_t size); 580 extern void *zio_data_buf_alloc(size_t size); 581 extern void zio_data_buf_free(void *buf, size_t size); 582 583 extern void zio_push_transform(zio_t *zio, void *data, uint64_t size, 584 uint64_t bufsize, zio_transform_func_t *transform); 585 extern void zio_pop_transforms(zio_t *zio); 586 587 extern void zio_resubmit_stage_async(void *); 588 589 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 590 uint64_t offset, void *data, uint64_t size, int type, 591 zio_priority_t priority, enum zio_flag flags, 592 zio_done_func_t *done, void *priv); 593 594 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 595 void *data, uint64_t size, int type, zio_priority_t priority, 596 enum zio_flag flags, zio_done_func_t *done, void *priv); 597 598 extern void zio_vdev_io_bypass(zio_t *zio); 599 extern void zio_vdev_io_reissue(zio_t *zio); 600 extern void zio_vdev_io_redone(zio_t *zio); 601 602 extern void zio_checksum_verified(zio_t *zio); 603 extern int zio_worst_error(int e1, int e2); 604 605 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 606 enum zio_checksum parent); 607 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 608 enum zio_checksum child, enum zio_checksum parent); 609 extern enum zio_compress zio_compress_select(spa_t *spa, 610 enum zio_compress child, enum zio_compress parent); 611 612 extern void zio_suspend(spa_t *spa, zio_t *zio); 613 extern int zio_resume(spa_t *spa); 614 extern void zio_resume_wait(spa_t *spa); 615 616 /* 617 * Initial setup and teardown. 618 */ 619 extern void zio_init(void); 620 extern void zio_fini(void); 621 622 /* 623 * Fault injection 624 */ 625 struct zinject_record; 626 extern uint32_t zio_injection_enabled; 627 extern int zio_inject_fault(char *name, int flags, int *id, 628 struct zinject_record *record); 629 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 630 struct zinject_record *record); 631 extern int zio_clear_fault(int id); 632 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 633 extern int zio_handle_fault_injection(zio_t *zio, int error); 634 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 635 extern int zio_handle_label_injection(zio_t *zio, int error); 636 extern void zio_handle_ignored_writes(zio_t *zio); 637 extern hrtime_t zio_handle_io_delay(zio_t *zio); 638 639 /* 640 * Checksum ereport functions 641 */ 642 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 643 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 644 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 645 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 646 647 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 648 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 649 650 /* If we have the good data in hand, this function can be used */ 651 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 652 struct zio *zio, uint64_t offset, uint64_t length, 653 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 654 655 /* Called from spa_sync(), but primarily an injection handler */ 656 extern void spa_handle_ignored_writes(spa_t *spa); 657 658 /* zbookmark_phys functions */ 659 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp, 660 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block); 661 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, 662 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 663 664 #ifdef __cplusplus 665 } 666 #endif 667 668 #endif /* _ZIO_H */ 669
Indexes created Tue May 26 00:24:38 UTC 2026