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