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, 2014 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, 178 179 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 180 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 181 182 /* 183 * Flags inherited by vdev children. 184 */ 185 ZIO_FLAG_IO_RETRY = 1 << 14, /* must be first for INHERIT */ 186 ZIO_FLAG_PROBE = 1 << 15, 187 ZIO_FLAG_TRYHARD = 1 << 16, 188 ZIO_FLAG_OPTIONAL = 1 << 17, 189 190 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 191 192 /* 193 * Flags not inherited by any children. 194 */ 195 ZIO_FLAG_DONT_QUEUE = 1 << 18, /* must be first for INHERIT */ 196 ZIO_FLAG_DONT_PROPAGATE = 1 << 19, 197 ZIO_FLAG_IO_BYPASS = 1 << 20, 198 ZIO_FLAG_IO_REWRITE = 1 << 21, 199 ZIO_FLAG_RAW = 1 << 22, 200 ZIO_FLAG_GANG_CHILD = 1 << 23, 201 ZIO_FLAG_DDT_CHILD = 1 << 24, 202 ZIO_FLAG_GODFATHER = 1 << 25, 203 ZIO_FLAG_NOPWRITE = 1 << 26, 204 ZIO_FLAG_REEXECUTED = 1 << 27, 205 ZIO_FLAG_DELEGATED = 1 << 28, 206 }; 207 208 #define ZIO_FLAG_MUSTSUCCEED 0 209 210 #define ZIO_DDT_CHILD_FLAGS(zio) \ 211 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 212 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 213 214 #define ZIO_GANG_CHILD_FLAGS(zio) \ 215 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 216 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 217 218 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 219 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 220 ZIO_FLAG_CANFAIL) 221 222 enum zio_child { 223 ZIO_CHILD_VDEV = 0, 224 ZIO_CHILD_GANG, 225 ZIO_CHILD_DDT, 226 ZIO_CHILD_LOGICAL, 227 ZIO_CHILD_TYPES 228 }; 229 230 enum zio_wait_type { 231 ZIO_WAIT_READY = 0, 232 ZIO_WAIT_DONE, 233 ZIO_WAIT_TYPES 234 }; 235 236 /* 237 * We'll take the number 122 and 123 to indicate checksum errors and 238 * fragmentation. Those doesn't collide with any errno values as they 239 * are greater than ELAST. 240 */ 241 #define ECKSUM 122 242 #define EFRAGS 123 243 244 typedef void zio_done_func_t(zio_t *zio); 245 246 extern const char *zio_type_name[ZIO_TYPES]; 247 248 /* 249 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 250 * identifies any block in the pool. By convention, the meta-objset (MOS) 251 * is objset 0, and the meta-dnode is object 0. This covers all blocks 252 * except root blocks and ZIL blocks, which are defined as follows: 253 * 254 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 255 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 256 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 257 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>. 258 * 259 * Note: this structure is called a bookmark because its original purpose 260 * was to remember where to resume a pool-wide traverse. 261 * 262 * Note: this structure is passed between userland and the kernel, and is 263 * stored on disk (by virtue of being incorporated into other on-disk 264 * structures, e.g. dsl_scan_phys_t). 265 */ 266 typedef struct zbookmark_phys { 267 uint64_t zb_objset; 268 uint64_t zb_object; 269 int64_t zb_level; 270 uint64_t zb_blkid; 271 } zbookmark_phys_t; 272 273 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 274 { \ 275 (zb)->zb_objset = objset; \ 276 (zb)->zb_object = object; \ 277 (zb)->zb_level = level; \ 278 (zb)->zb_blkid = blkid; \ 279 } 280 281 #define ZB_DESTROYED_OBJSET (-1ULL) 282 283 #define ZB_ROOT_OBJECT (0ULL) 284 #define ZB_ROOT_LEVEL (-1LL) 285 #define ZB_ROOT_BLKID (0ULL) 286 287 #define ZB_ZIL_OBJECT (0ULL) 288 #define ZB_ZIL_LEVEL (-2LL) 289 290 #define ZB_DNODE_LEVEL (-3LL) 291 #define ZB_DNODE_BLKID (0ULL) 292 293 #define ZB_IS_ZERO(zb) \ 294 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 295 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 296 #define ZB_IS_ROOT(zb) \ 297 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 298 (zb)->zb_level == ZB_ROOT_LEVEL && \ 299 (zb)->zb_blkid == ZB_ROOT_BLKID) 300 301 typedef struct zio_prop { 302 enum zio_checksum zp_checksum; 303 enum zio_compress zp_compress; 304 dmu_object_type_t zp_type; 305 uint8_t zp_level; 306 uint8_t zp_copies; 307 boolean_t zp_dedup; 308 boolean_t zp_dedup_verify; 309 boolean_t zp_nopwrite; 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; 320 321 struct zio_cksum_report { 322 struct zio_cksum_report *zcr_next; 323 nvlist_t *zcr_ereport; 324 nvlist_t *zcr_detector; 325 void *zcr_cbdata; 326 size_t zcr_cbinfo; /* passed to zcr_free() */ 327 uint64_t zcr_align; 328 uint64_t zcr_length; 329 zio_cksum_finish_f *zcr_finish; 330 zio_cksum_free_f *zcr_free; 331 332 /* internal use only */ 333 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 334 }; 335 336 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 337 void *arg); 338 339 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 340 341 typedef struct zio_vsd_ops { 342 zio_done_func_t *vsd_free; 343 zio_vsd_cksum_report_f *vsd_cksum_report; 344 } zio_vsd_ops_t; 345 346 typedef struct zio_gang_node { 347 zio_gbh_phys_t *gn_gbh; 348 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 349 } zio_gang_node_t; 350 351 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 352 zio_gang_node_t *gn, void *data); 353 354 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 355 356 typedef struct zio_transform { 357 void *zt_orig_data; 358 uint64_t zt_orig_size; 359 uint64_t zt_bufsize; 360 zio_transform_func_t *zt_transform; 361 struct zio_transform *zt_next; 362 } zio_transform_t; 363 364 typedef int zio_pipe_stage_t(zio_t *zio); 365 366 /* 367 * The io_reexecute flags are distinct from io_flags because the child must 368 * be able to propagate them to the parent. The normal io_flags are local 369 * to the zio, not protected by any lock, and not modifiable by children; 370 * the reexecute flags are protected by io_lock, modifiable by children, 371 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 372 */ 373 #define ZIO_REEXECUTE_NOW 0x01 374 #define ZIO_REEXECUTE_SUSPEND 0x02 375 376 typedef struct zio_link { 377 zio_t *zl_parent; 378 zio_t *zl_child; 379 list_node_t zl_parent_node; 380 list_node_t zl_child_node; 381 } zio_link_t; 382 383 /* 384 * Used for TRIM kstat. 385 */ 386 typedef struct zio_trim_stats { 387 /* 388 * Number of bytes successfully TRIMmed. 389 */ 390 kstat_named_t bytes; 391 392 /* 393 * Number of successful TRIM requests. 394 */ 395 kstat_named_t success; 396 397 /* 398 * Number of TRIM requests that failed because TRIM is not 399 * supported. 400 */ 401 kstat_named_t unsupported; 402 403 /* 404 * Number of TRIM requests that failed for other reasons. 405 */ 406 kstat_named_t failed; 407 } zio_trim_stats_t; 408 409 extern zio_trim_stats_t zio_trim_stats; 410 411 #define ZIO_TRIM_STAT_INCR(stat, val) \ 412 atomic_add_64(&zio_trim_stats.stat.value.ui64, (val)); 413 #define ZIO_TRIM_STAT_BUMP(stat) \ 414 ZIO_TRIM_STAT_INCR(stat, 1); 415 416 struct zio { 417 /* Core information about this I/O */ 418 zbookmark_phys_t io_bookmark; 419 zio_prop_t io_prop; 420 zio_type_t io_type; 421 enum zio_child io_child_type; 422 int io_cmd; 423 zio_priority_t io_priority; 424 uint8_t io_reexecute; 425 uint8_t io_state[ZIO_WAIT_TYPES]; 426 uint64_t io_txg; 427 spa_t *io_spa; 428 blkptr_t *io_bp; 429 blkptr_t *io_bp_override; 430 blkptr_t io_bp_copy; 431 list_t io_parent_list; 432 list_t io_child_list; 433 zio_link_t *io_walk_link; 434 zio_t *io_logical; 435 zio_transform_t *io_transform_stack; 436 437 /* Callback info */ 438 zio_done_func_t *io_ready; 439 zio_done_func_t *io_physdone; 440 zio_done_func_t *io_done; 441 void *io_private; 442 int64_t io_prev_space_delta; /* DMU private */ 443 blkptr_t io_bp_orig; 444 445 /* Data represented by this I/O */ 446 void *io_data; 447 void *io_orig_data; 448 uint64_t io_size; 449 uint64_t io_orig_size; 450 451 /* Stuff for the vdev stack */ 452 vdev_t *io_vd; 453 void *io_vsd; 454 const zio_vsd_ops_t *io_vsd_ops; 455 456 uint64_t io_offset; 457 hrtime_t io_timestamp; 458 avl_node_t io_queue_node; 459 avl_node_t io_offset_node; 460 461 /* Internal pipeline state */ 462 enum zio_flag io_flags; 463 enum zio_stage io_stage; 464 enum zio_stage io_pipeline; 465 enum zio_flag io_orig_flags; 466 enum zio_stage io_orig_stage; 467 enum zio_stage io_orig_pipeline; 468 int io_error; 469 int io_child_error[ZIO_CHILD_TYPES]; 470 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 471 uint64_t io_child_count; 472 uint64_t io_phys_children; 473 uint64_t io_parent_count; 474 uint64_t *io_stall; 475 zio_t *io_gang_leader; 476 zio_gang_node_t *io_gang_tree; 477 void *io_executor; 478 void *io_waiter; 479 kmutex_t io_lock; 480 kcondvar_t io_cv; 481 482 /* FMA state */ 483 zio_cksum_report_t *io_cksum_report; 484 uint64_t io_ena; 485 486 /* Taskq dispatching state */ 487 taskq_ent_t io_tqent; 488 489 avl_node_t io_trim_node; 490 list_node_t io_trim_link; 491 }; 492 493 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 494 zio_done_func_t *done, void *priv, enum zio_flag flags); 495 496 extern zio_t *zio_root(spa_t *spa, 497 zio_done_func_t *done, void *priv, enum zio_flag flags); 498 499 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 500 uint64_t size, zio_done_func_t *done, void *priv, 501 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 502 503 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 504 void *data, uint64_t size, const zio_prop_t *zp, 505 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, 506 void *priv, 507 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 508 509 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 510 void *data, uint64_t size, zio_done_func_t *done, void *priv, 511 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 512 513 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 514 boolean_t nopwrite); 515 516 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 517 518 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 519 const blkptr_t *bp, 520 zio_done_func_t *done, void *priv, enum zio_flag flags); 521 522 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 523 uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv, 524 zio_priority_t priority, enum zio_flag flags); 525 526 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 527 uint64_t size, void *data, int checksum, 528 zio_done_func_t *done, void *priv, zio_priority_t priority, 529 enum zio_flag flags, boolean_t labels); 530 531 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 532 uint64_t size, void *data, int checksum, 533 zio_done_func_t *done, void *priv, zio_priority_t priority, 534 enum zio_flag flags, boolean_t labels); 535 536 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 537 const blkptr_t *bp, uint64_t size, enum zio_flag flags); 538 539 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 540 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 541 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 542 extern void zio_flush(zio_t *zio, vdev_t *vd); 543 extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset, 544 uint64_t size); 545 extern void zio_shrink(zio_t *zio, uint64_t size); 546 547 extern int zio_wait(zio_t *zio); 548 extern void zio_nowait(zio_t *zio); 549 extern void zio_execute(zio_t *zio); 550 extern void zio_interrupt(zio_t *zio); 551 552 extern zio_t *zio_walk_parents(zio_t *cio); 553 extern zio_t *zio_walk_children(zio_t *pio); 554 extern zio_t *zio_unique_parent(zio_t *cio); 555 extern void zio_add_child(zio_t *pio, zio_t *cio); 556 557 extern void *zio_buf_alloc(size_t size); 558 extern void zio_buf_free(void *buf, size_t size); 559 extern void *zio_data_buf_alloc(size_t size); 560 extern void zio_data_buf_free(void *buf, size_t size); 561 562 extern void zio_resubmit_stage_async(void *); 563 564 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 565 uint64_t offset, void *data, uint64_t size, int type, 566 zio_priority_t priority, enum zio_flag flags, 567 zio_done_func_t *done, void *priv); 568 569 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 570 void *data, uint64_t size, int type, zio_priority_t priority, 571 enum zio_flag flags, zio_done_func_t *done, void *priv); 572 573 extern void zio_vdev_io_bypass(zio_t *zio); 574 extern void zio_vdev_io_reissue(zio_t *zio); 575 extern void zio_vdev_io_redone(zio_t *zio); 576 577 extern void zio_checksum_verified(zio_t *zio); 578 extern int zio_worst_error(int e1, int e2); 579 580 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 581 enum zio_checksum parent); 582 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 583 enum zio_checksum child, enum zio_checksum parent); 584 extern enum zio_compress zio_compress_select(spa_t *spa, 585 enum zio_compress child, enum zio_compress parent); 586 587 extern void zio_suspend(spa_t *spa, zio_t *zio); 588 extern int zio_resume(spa_t *spa); 589 extern void zio_resume_wait(spa_t *spa); 590 591 /* 592 * Initial setup and teardown. 593 */ 594 extern void zio_init(void); 595 extern void zio_fini(void); 596 597 /* 598 * Fault injection 599 */ 600 struct zinject_record; 601 extern uint32_t zio_injection_enabled; 602 extern int zio_inject_fault(char *name, int flags, int *id, 603 struct zinject_record *record); 604 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 605 struct zinject_record *record); 606 extern int zio_clear_fault(int id); 607 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 608 extern int zio_handle_fault_injection(zio_t *zio, int error); 609 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 610 extern int zio_handle_label_injection(zio_t *zio, int error); 611 extern void zio_handle_ignored_writes(zio_t *zio); 612 extern uint64_t zio_handle_io_delay(zio_t *zio); 613 614 /* 615 * Checksum ereport functions 616 */ 617 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 618 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 619 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 620 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 621 622 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 623 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 624 625 /* If we have the good data in hand, this function can be used */ 626 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 627 struct zio *zio, uint64_t offset, uint64_t length, 628 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 629 630 /* Called from spa_sync(), but primarily an injection handler */ 631 extern void spa_handle_ignored_writes(spa_t *spa); 632 633 /* zbookmark_phys functions */ 634 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp, 635 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block); 636 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, 637 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 638 639 #ifdef __cplusplus 640 } 641 #endif 642 643 #endif /* _ZIO_H */ 644