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, 2017 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 enum zio_flag { 142 /* 143 * Flags inherited by gang, ddt, and vdev children, 144 * and that must be equal for two zios to aggregate 145 */ 146 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 147 ZIO_FLAG_IO_REPAIR = 1 << 1, 148 ZIO_FLAG_SELF_HEAL = 1 << 2, 149 ZIO_FLAG_RESILVER = 1 << 3, 150 ZIO_FLAG_SCRUB = 1 << 4, 151 ZIO_FLAG_SCAN_THREAD = 1 << 5, 152 ZIO_FLAG_PHYSICAL = 1 << 6, 153 154 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 155 156 /* 157 * Flags inherited by ddt, gang, and vdev children. 158 */ 159 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 160 ZIO_FLAG_SPECULATIVE = 1 << 8, 161 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 162 ZIO_FLAG_DONT_RETRY = 1 << 10, 163 ZIO_FLAG_DONT_CACHE = 1 << 11, 164 ZIO_FLAG_NODATA = 1 << 12, 165 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 166 ZIO_FLAG_IO_ALLOCATING = 1 << 14, 167 168 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 169 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 170 171 /* 172 * Flags inherited by vdev children. 173 */ 174 ZIO_FLAG_IO_RETRY = 1 << 15, /* must be first for INHERIT */ 175 ZIO_FLAG_PROBE = 1 << 16, 176 ZIO_FLAG_TRYHARD = 1 << 17, 177 ZIO_FLAG_OPTIONAL = 1 << 18, 178 179 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 180 181 /* 182 * Flags not inherited by any children. 183 */ 184 ZIO_FLAG_DONT_QUEUE = 1 << 19, /* must be first for INHERIT */ 185 ZIO_FLAG_DONT_PROPAGATE = 1 << 20, 186 ZIO_FLAG_IO_BYPASS = 1 << 21, 187 ZIO_FLAG_IO_REWRITE = 1 << 22, 188 ZIO_FLAG_RAW = 1 << 23, 189 ZIO_FLAG_GANG_CHILD = 1 << 24, 190 ZIO_FLAG_DDT_CHILD = 1 << 25, 191 ZIO_FLAG_GODFATHER = 1 << 26, 192 ZIO_FLAG_NOPWRITE = 1 << 27, 193 ZIO_FLAG_REEXECUTED = 1 << 28, 194 ZIO_FLAG_DELEGATED = 1 << 29, 195 }; 196 197 #define ZIO_FLAG_MUSTSUCCEED 0 198 199 #define ZIO_DDT_CHILD_FLAGS(zio) \ 200 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 201 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 202 203 #define ZIO_GANG_CHILD_FLAGS(zio) \ 204 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 205 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 206 207 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 208 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 209 ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_CANFAIL) 210 211 #define ZIO_CHILD_BIT(x) (1 << (x)) 212 #define ZIO_CHILD_BIT_IS_SET(val, x) ((val) & (1 << (x))) 213 214 enum zio_child { 215 ZIO_CHILD_VDEV = 0, 216 ZIO_CHILD_GANG, 217 ZIO_CHILD_DDT, 218 ZIO_CHILD_LOGICAL, 219 ZIO_CHILD_TYPES 220 }; 221 222 #define ZIO_CHILD_VDEV_BIT ZIO_CHILD_BIT(ZIO_CHILD_VDEV) 223 #define ZIO_CHILD_GANG_BIT ZIO_CHILD_BIT(ZIO_CHILD_GANG) 224 #define ZIO_CHILD_DDT_BIT ZIO_CHILD_BIT(ZIO_CHILD_DDT) 225 #define ZIO_CHILD_LOGICAL_BIT ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL) 226 #define ZIO_CHILD_ALL_BITS \ 227 (ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT | \ 228 ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT) 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 unused errnos, 'EBADE' and 'EBADR' (from the Convergent 238 * graveyard) to indicate checksum errors and fragmentation. 239 */ 240 #define ECKSUM EBADE 241 #define EFRAGS EBADR 242 243 typedef void zio_done_func_t(zio_t *zio); 244 245 extern boolean_t zio_dva_throttle_enabled; 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 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 int 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 struct zio { 390 /* Core information about this I/O */ 391 zbookmark_phys_t io_bookmark; 392 zio_prop_t io_prop; 393 zio_type_t io_type; 394 enum zio_child io_child_type; 395 int io_cmd; 396 zio_priority_t io_priority; 397 uint8_t io_reexecute; 398 uint8_t io_state[ZIO_WAIT_TYPES]; 399 uint64_t io_txg; 400 spa_t *io_spa; 401 blkptr_t *io_bp; 402 blkptr_t *io_bp_override; 403 blkptr_t io_bp_copy; 404 list_t io_parent_list; 405 list_t io_child_list; 406 zio_t *io_logical; 407 zio_transform_t *io_transform_stack; 408 409 /* Callback info */ 410 zio_done_func_t *io_ready; 411 zio_done_func_t *io_children_ready; 412 zio_done_func_t *io_physdone; 413 zio_done_func_t *io_done; 414 void *io_private; 415 int64_t io_prev_space_delta; /* DMU private */ 416 blkptr_t io_bp_orig; 417 418 /* Data represented by this I/O */ 419 struct abd *io_abd; 420 struct abd *io_orig_abd; 421 uint64_t io_size; 422 uint64_t io_orig_size; 423 /* io_lsize != io_orig_size iff this is a raw write */ 424 uint64_t io_lsize; 425 426 /* Stuff for the vdev stack */ 427 vdev_t *io_vd; 428 void *io_vsd; 429 const zio_vsd_ops_t *io_vsd_ops; 430 431 uint64_t io_offset; 432 hrtime_t io_timestamp; 433 hrtime_t io_queued_timestamp; 434 hrtime_t io_target_timestamp; 435 avl_node_t io_queue_node; 436 avl_node_t io_offset_node; 437 avl_node_t io_alloc_node; 438 zio_alloc_list_t io_alloc_list; 439 440 /* Internal pipeline state */ 441 enum zio_flag io_flags; 442 enum zio_stage io_stage; 443 enum zio_stage io_pipeline; 444 enum zio_flag io_orig_flags; 445 enum zio_stage io_orig_stage; 446 enum zio_stage io_orig_pipeline; 447 enum zio_stage io_pipeline_trace; 448 int io_error; 449 int io_child_error[ZIO_CHILD_TYPES]; 450 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 451 uint64_t io_child_count; 452 uint64_t io_phys_children; 453 uint64_t io_parent_count; 454 uint64_t *io_stall; 455 zio_t *io_gang_leader; 456 zio_gang_node_t *io_gang_tree; 457 void *io_executor; 458 void *io_waiter; 459 kmutex_t io_lock; 460 kcondvar_t io_cv; 461 462 /* FMA state */ 463 zio_cksum_report_t *io_cksum_report; 464 uint64_t io_ena; 465 466 /* Taskq dispatching state */ 467 taskq_ent_t io_tqent; 468 }; 469 470 extern int zio_bookmark_compare(const void *, const void *); 471 472 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 473 zio_done_func_t *done, void *private, enum zio_flag flags); 474 475 extern zio_t *zio_root(spa_t *spa, 476 zio_done_func_t *done, void *private, enum zio_flag flags); 477 478 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 479 struct abd *data, uint64_t lsize, zio_done_func_t *done, void *private, 480 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 481 482 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 483 struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp, 484 zio_done_func_t *ready, zio_done_func_t *children_ready, 485 zio_done_func_t *physdone, zio_done_func_t *done, 486 void *private, zio_priority_t priority, enum zio_flag flags, 487 const zbookmark_phys_t *zb); 488 489 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 490 struct abd *data, uint64_t size, zio_done_func_t *done, void *private, 491 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 492 493 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 494 boolean_t nopwrite); 495 496 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 497 498 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 499 const blkptr_t *bp, 500 zio_done_func_t *done, void *private, enum zio_flag flags); 501 502 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 503 zio_done_func_t *done, void *private, enum zio_flag flags); 504 505 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 506 uint64_t size, struct abd *data, int checksum, 507 zio_done_func_t *done, void *private, zio_priority_t priority, 508 enum zio_flag flags, boolean_t labels); 509 510 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 511 uint64_t size, struct abd *data, int checksum, 512 zio_done_func_t *done, void *private, zio_priority_t priority, 513 enum zio_flag flags, boolean_t labels); 514 515 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 516 const blkptr_t *bp, enum zio_flag flags); 517 518 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 519 blkptr_t *old_bp, uint64_t size, boolean_t *slog); 520 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 521 extern void zio_flush(zio_t *zio, vdev_t *vd); 522 extern void zio_shrink(zio_t *zio, uint64_t size); 523 524 extern int zio_wait(zio_t *zio); 525 extern void zio_nowait(zio_t *zio); 526 extern void zio_execute(zio_t *zio); 527 extern void zio_interrupt(zio_t *zio); 528 extern void zio_delay_init(zio_t *zio); 529 extern void zio_delay_interrupt(zio_t *zio); 530 531 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **); 532 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **); 533 extern zio_t *zio_unique_parent(zio_t *cio); 534 extern void zio_add_child(zio_t *pio, zio_t *cio); 535 536 extern void *zio_buf_alloc(size_t size); 537 extern void zio_buf_free(void *buf, size_t size); 538 extern void *zio_data_buf_alloc(size_t size); 539 extern void zio_data_buf_free(void *buf, size_t size); 540 541 extern void zio_push_transform(zio_t *zio, struct abd *abd, uint64_t size, 542 uint64_t bufsize, zio_transform_func_t *transform); 543 extern void zio_pop_transforms(zio_t *zio); 544 545 extern void zio_resubmit_stage_async(void *); 546 547 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 548 uint64_t offset, struct abd *data, uint64_t size, int type, 549 zio_priority_t priority, enum zio_flag flags, 550 zio_done_func_t *done, void *private); 551 552 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 553 struct abd *data, uint64_t size, int type, zio_priority_t priority, 554 enum zio_flag flags, zio_done_func_t *done, void *private); 555 556 extern void zio_vdev_io_bypass(zio_t *zio); 557 extern void zio_vdev_io_reissue(zio_t *zio); 558 extern void zio_vdev_io_redone(zio_t *zio); 559 560 extern void zio_checksum_verified(zio_t *zio); 561 extern int zio_worst_error(int e1, int e2); 562 563 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 564 enum zio_checksum parent); 565 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 566 enum zio_checksum child, enum zio_checksum parent); 567 extern enum zio_compress zio_compress_select(spa_t *spa, 568 enum zio_compress child, enum zio_compress parent); 569 570 extern void zio_suspend(spa_t *spa, zio_t *zio); 571 extern int zio_resume(spa_t *spa); 572 extern void zio_resume_wait(spa_t *spa); 573 574 /* 575 * Initial setup and teardown. 576 */ 577 extern void zio_init(void); 578 extern void zio_fini(void); 579 580 /* 581 * Fault injection 582 */ 583 struct zinject_record; 584 extern uint32_t zio_injection_enabled; 585 extern int zio_inject_fault(char *name, int flags, int *id, 586 struct zinject_record *record); 587 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 588 struct zinject_record *record); 589 extern int zio_clear_fault(int id); 590 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 591 extern int zio_handle_fault_injection(zio_t *zio, int error); 592 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 593 extern int zio_handle_label_injection(zio_t *zio, int error); 594 extern void zio_handle_ignored_writes(zio_t *zio); 595 extern hrtime_t zio_handle_io_delay(zio_t *zio); 596 597 /* 598 * Checksum ereport functions 599 */ 600 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 601 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 602 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 603 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 604 605 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 606 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 607 608 /* If we have the good data in hand, this function can be used */ 609 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 610 struct zio *zio, uint64_t offset, uint64_t length, 611 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 612 613 /* Called from spa_sync(), but primarily an injection handler */ 614 extern void spa_handle_ignored_writes(spa_t *spa); 615 616 /* zbookmark_phys functions */ 617 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp, 618 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block); 619 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, 620 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 621 622 #ifdef __cplusplus 623 } 624 #endif 625 626 #endif /* _ZIO_H */ 627