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 (c) 2013, Joyent, Inc. All rights reserved. 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/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 ZIO_CHECKSUM_SHA512, 86 ZIO_CHECKSUM_SKEIN, 87 ZIO_CHECKSUM_EDONR, 88 ZIO_CHECKSUM_FUNCTIONS 89 }; 90 91 /* 92 * The number of "legacy" compression functions which can be set on individual 93 * objects. 94 */ 95 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2 96 97 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 98 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 99 100 #define ZIO_CHECKSUM_MASK 0xffULL 101 #define ZIO_CHECKSUM_VERIFY (1 << 8) 102 103 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 104 #define ZIO_DEDUPDITTO_MIN 100 105 106 enum zio_compress { 107 ZIO_COMPRESS_INHERIT = 0, 108 ZIO_COMPRESS_ON, 109 ZIO_COMPRESS_OFF, 110 ZIO_COMPRESS_LZJB, 111 ZIO_COMPRESS_EMPTY, 112 ZIO_COMPRESS_GZIP_1, 113 ZIO_COMPRESS_GZIP_2, 114 ZIO_COMPRESS_GZIP_3, 115 ZIO_COMPRESS_GZIP_4, 116 ZIO_COMPRESS_GZIP_5, 117 ZIO_COMPRESS_GZIP_6, 118 ZIO_COMPRESS_GZIP_7, 119 ZIO_COMPRESS_GZIP_8, 120 ZIO_COMPRESS_GZIP_9, 121 ZIO_COMPRESS_ZLE, 122 ZIO_COMPRESS_LZ4, 123 ZIO_COMPRESS_FUNCTIONS 124 }; 125 126 /* 127 * The number of "legacy" compression functions which can be set on individual 128 * objects. 129 */ 130 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4 131 132 /* 133 * The meaning of "compress = on" selected by the compression features enabled 134 * on a given pool. 135 */ 136 #define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB 137 #define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4 138 139 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 140 141 #define BOOTFS_COMPRESS_VALID(compress) \ 142 ((compress) == ZIO_COMPRESS_LZJB || \ 143 (compress) == ZIO_COMPRESS_LZ4 || \ 144 (compress) == ZIO_COMPRESS_ON || \ 145 (compress) == ZIO_COMPRESS_OFF) 146 147 #define ZIO_FAILURE_MODE_WAIT 0 148 #define ZIO_FAILURE_MODE_CONTINUE 1 149 #define ZIO_FAILURE_MODE_PANIC 2 150 151 enum zio_flag { 152 /* 153 * Flags inherited by gang, ddt, and vdev children, 154 * and that must be equal for two zios to aggregate 155 */ 156 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 157 ZIO_FLAG_IO_REPAIR = 1 << 1, 158 ZIO_FLAG_SELF_HEAL = 1 << 2, 159 ZIO_FLAG_RESILVER = 1 << 3, 160 ZIO_FLAG_SCRUB = 1 << 4, 161 ZIO_FLAG_SCAN_THREAD = 1 << 5, 162 ZIO_FLAG_PHYSICAL = 1 << 6, 163 164 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 165 166 /* 167 * Flags inherited by ddt, gang, and vdev children. 168 */ 169 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 170 ZIO_FLAG_SPECULATIVE = 1 << 8, 171 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 172 ZIO_FLAG_DONT_RETRY = 1 << 10, 173 ZIO_FLAG_DONT_CACHE = 1 << 11, 174 ZIO_FLAG_NODATA = 1 << 12, 175 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 176 ZIO_FLAG_IO_ALLOCATING = 1 << 14, 177 178 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 179 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 180 181 /* 182 * Flags inherited by vdev children. 183 */ 184 ZIO_FLAG_IO_RETRY = 1 << 15, /* must be first for INHERIT */ 185 ZIO_FLAG_PROBE = 1 << 16, 186 ZIO_FLAG_TRYHARD = 1 << 17, 187 ZIO_FLAG_OPTIONAL = 1 << 18, 188 189 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 190 191 /* 192 * Flags not inherited by any children. 193 */ 194 ZIO_FLAG_DONT_QUEUE = 1 << 19, /* must be first for INHERIT */ 195 ZIO_FLAG_DONT_PROPAGATE = 1 << 20, 196 ZIO_FLAG_IO_BYPASS = 1 << 21, 197 ZIO_FLAG_IO_REWRITE = 1 << 22, 198 ZIO_FLAG_RAW = 1 << 23, 199 ZIO_FLAG_GANG_CHILD = 1 << 24, 200 ZIO_FLAG_DDT_CHILD = 1 << 25, 201 ZIO_FLAG_GODFATHER = 1 << 26, 202 ZIO_FLAG_NOPWRITE = 1 << 27, 203 ZIO_FLAG_REEXECUTED = 1 << 28, 204 ZIO_FLAG_DELEGATED = 1 << 29, 205 }; 206 207 #define ZIO_FLAG_MUSTSUCCEED 0 208 209 #define ZIO_DDT_CHILD_FLAGS(zio) \ 210 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 211 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 212 213 #define ZIO_GANG_CHILD_FLAGS(zio) \ 214 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 215 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 216 217 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 218 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 219 ZIO_FLAG_CANFAIL) 220 221 enum zio_child { 222 ZIO_CHILD_VDEV = 0, 223 ZIO_CHILD_GANG, 224 ZIO_CHILD_DDT, 225 ZIO_CHILD_LOGICAL, 226 ZIO_CHILD_TYPES 227 }; 228 229 enum zio_wait_type { 230 ZIO_WAIT_READY = 0, 231 ZIO_WAIT_DONE, 232 ZIO_WAIT_TYPES 233 }; 234 235 /* 236 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 237 * graveyard) to indicate checksum errors and fragmentation. 238 */ 239 #define ECKSUM EBADE 240 #define EFRAGS EBADR 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 } zio_prop_t; 310 311 typedef struct zio_cksum_report zio_cksum_report_t; 312 313 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 314 const void *good_data); 315 typedef void zio_cksum_free_f(void *cbdata, size_t size); 316 317 struct zio_bad_cksum; /* defined in zio_checksum.h */ 318 struct dnode_phys; 319 320 struct zio_cksum_report { 321 struct zio_cksum_report *zcr_next; 322 nvlist_t *zcr_ereport; 323 nvlist_t *zcr_detector; 324 void *zcr_cbdata; 325 size_t zcr_cbinfo; /* passed to zcr_free() */ 326 uint64_t zcr_align; 327 uint64_t zcr_length; 328 zio_cksum_finish_f *zcr_finish; 329 zio_cksum_free_f *zcr_free; 330 331 /* internal use only */ 332 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 333 }; 334 335 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 336 void *arg); 337 338 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 339 340 typedef struct zio_vsd_ops { 341 zio_done_func_t *vsd_free; 342 zio_vsd_cksum_report_f *vsd_cksum_report; 343 } zio_vsd_ops_t; 344 345 typedef struct zio_gang_node { 346 zio_gbh_phys_t *gn_gbh; 347 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 348 } zio_gang_node_t; 349 350 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 351 zio_gang_node_t *gn, void *data); 352 353 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 354 355 typedef struct zio_transform { 356 void *zt_orig_data; 357 uint64_t zt_orig_size; 358 uint64_t zt_bufsize; 359 zio_transform_func_t *zt_transform; 360 struct zio_transform *zt_next; 361 } zio_transform_t; 362 363 typedef int zio_pipe_stage_t(zio_t *zio); 364 365 /* 366 * The io_reexecute flags are distinct from io_flags because the child must 367 * be able to propagate them to the parent. The normal io_flags are local 368 * to the zio, not protected by any lock, and not modifiable by children; 369 * the reexecute flags are protected by io_lock, modifiable by children, 370 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 371 */ 372 #define ZIO_REEXECUTE_NOW 0x01 373 #define ZIO_REEXECUTE_SUSPEND 0x02 374 375 typedef struct zio_link { 376 zio_t *zl_parent; 377 zio_t *zl_child; 378 list_node_t zl_parent_node; 379 list_node_t zl_child_node; 380 } zio_link_t; 381 382 struct zio { 383 /* Core information about this I/O */ 384 zbookmark_phys_t io_bookmark; 385 zio_prop_t io_prop; 386 zio_type_t io_type; 387 enum zio_child io_child_type; 388 int io_cmd; 389 zio_priority_t io_priority; 390 uint8_t io_reexecute; 391 uint8_t io_state[ZIO_WAIT_TYPES]; 392 uint64_t io_txg; 393 spa_t *io_spa; 394 blkptr_t *io_bp; 395 blkptr_t *io_bp_override; 396 blkptr_t io_bp_copy; 397 list_t io_parent_list; 398 list_t io_child_list; 399 zio_t *io_logical; 400 zio_transform_t *io_transform_stack; 401 402 /* Callback info */ 403 zio_done_func_t *io_ready; 404 zio_done_func_t *io_children_ready; 405 zio_done_func_t *io_physdone; 406 zio_done_func_t *io_done; 407 void *io_private; 408 int64_t io_prev_space_delta; /* DMU private */ 409 blkptr_t io_bp_orig; 410 411 /* Data represented by this I/O */ 412 void *io_data; 413 void *io_orig_data; 414 uint64_t io_size; 415 uint64_t io_orig_size; 416 417 /* Stuff for the vdev stack */ 418 vdev_t *io_vd; 419 void *io_vsd; 420 const zio_vsd_ops_t *io_vsd_ops; 421 422 uint64_t io_offset; 423 hrtime_t io_timestamp; 424 hrtime_t io_queued_timestamp; 425 hrtime_t io_target_timestamp; 426 avl_node_t io_queue_node; 427 avl_node_t io_offset_node; 428 avl_node_t io_alloc_node; 429 430 /* Internal pipeline state */ 431 enum zio_flag io_flags; 432 enum zio_stage io_stage; 433 enum zio_stage io_pipeline; 434 enum zio_flag io_orig_flags; 435 enum zio_stage io_orig_stage; 436 enum zio_stage io_orig_pipeline; 437 enum zio_stage io_pipeline_trace; 438 int io_error; 439 int io_child_error[ZIO_CHILD_TYPES]; 440 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 441 uint64_t io_child_count; 442 uint64_t io_phys_children; 443 uint64_t io_parent_count; 444 uint64_t *io_stall; 445 zio_t *io_gang_leader; 446 zio_gang_node_t *io_gang_tree; 447 void *io_executor; 448 void *io_waiter; 449 kmutex_t io_lock; 450 kcondvar_t io_cv; 451 452 /* FMA state */ 453 zio_cksum_report_t *io_cksum_report; 454 uint64_t io_ena; 455 456 /* Taskq dispatching state */ 457 taskq_ent_t io_tqent; 458 }; 459 460 extern int zio_timestamp_compare(const void *, const void *); 461 462 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 463 zio_done_func_t *done, void *private, enum zio_flag flags); 464 465 extern zio_t *zio_root(spa_t *spa, 466 zio_done_func_t *done, void *private, enum zio_flag flags); 467 468 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 469 uint64_t size, zio_done_func_t *done, void *private, 470 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 471 472 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 473 void *data, uint64_t size, const zio_prop_t *zp, 474 zio_done_func_t *ready, zio_done_func_t *children_ready, 475 zio_done_func_t *physdone, zio_done_func_t *done, 476 void *private, zio_priority_t priority, enum zio_flag flags, 477 const zbookmark_phys_t *zb); 478 479 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 480 void *data, uint64_t size, zio_done_func_t *done, void *private, 481 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 482 483 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 484 boolean_t nopwrite); 485 486 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 487 488 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 489 const blkptr_t *bp, 490 zio_done_func_t *done, void *private, enum zio_flag flags); 491 492 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 493 zio_done_func_t *done, void *private, enum zio_flag flags); 494 495 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 496 uint64_t size, void *data, int checksum, 497 zio_done_func_t *done, void *private, zio_priority_t priority, 498 enum zio_flag flags, boolean_t labels); 499 500 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 501 uint64_t size, void *data, int checksum, 502 zio_done_func_t *done, void *private, zio_priority_t priority, 503 enum zio_flag flags, boolean_t labels); 504 505 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 506 const blkptr_t *bp, enum zio_flag flags); 507 508 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 509 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 510 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 511 extern void zio_flush(zio_t *zio, vdev_t *vd); 512 extern void zio_shrink(zio_t *zio, uint64_t size); 513 514 extern int zio_wait(zio_t *zio); 515 extern void zio_nowait(zio_t *zio); 516 extern void zio_execute(zio_t *zio); 517 extern void zio_interrupt(zio_t *zio); 518 extern void zio_delay_init(zio_t *zio); 519 extern void zio_delay_interrupt(zio_t *zio); 520 521 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **); 522 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **); 523 extern zio_t *zio_unique_parent(zio_t *cio); 524 extern void zio_add_child(zio_t *pio, zio_t *cio); 525 526 extern void *zio_buf_alloc(size_t size); 527 extern void zio_buf_free(void *buf, size_t size); 528 extern void *zio_data_buf_alloc(size_t size); 529 extern void zio_data_buf_free(void *buf, size_t size); 530 531 extern void zio_push_transform(zio_t *zio, void *data, uint64_t size, 532 uint64_t bufsize, zio_transform_func_t *transform); 533 extern void zio_pop_transforms(zio_t *zio); 534 535 extern void zio_resubmit_stage_async(void *); 536 537 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 538 uint64_t offset, void *data, uint64_t size, int type, 539 zio_priority_t priority, enum zio_flag flags, 540 zio_done_func_t *done, void *private); 541 542 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 543 void *data, uint64_t size, int type, zio_priority_t priority, 544 enum zio_flag flags, zio_done_func_t *done, void *private); 545 546 extern void zio_vdev_io_bypass(zio_t *zio); 547 extern void zio_vdev_io_reissue(zio_t *zio); 548 extern void zio_vdev_io_redone(zio_t *zio); 549 550 extern void zio_checksum_verified(zio_t *zio); 551 extern int zio_worst_error(int e1, int e2); 552 553 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 554 enum zio_checksum parent); 555 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 556 enum zio_checksum child, enum zio_checksum parent); 557 extern enum zio_compress zio_compress_select(spa_t *spa, 558 enum zio_compress child, enum zio_compress parent); 559 560 extern void zio_suspend(spa_t *spa, zio_t *zio); 561 extern int zio_resume(spa_t *spa); 562 extern void zio_resume_wait(spa_t *spa); 563 564 /* 565 * Initial setup and teardown. 566 */ 567 extern void zio_init(void); 568 extern void zio_fini(void); 569 570 /* 571 * Fault injection 572 */ 573 struct zinject_record; 574 extern uint32_t zio_injection_enabled; 575 extern int zio_inject_fault(char *name, int flags, int *id, 576 struct zinject_record *record); 577 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 578 struct zinject_record *record); 579 extern int zio_clear_fault(int id); 580 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 581 extern int zio_handle_fault_injection(zio_t *zio, int error); 582 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 583 extern int zio_handle_label_injection(zio_t *zio, int error); 584 extern void zio_handle_ignored_writes(zio_t *zio); 585 extern hrtime_t zio_handle_io_delay(zio_t *zio); 586 587 /* 588 * Checksum ereport functions 589 */ 590 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 591 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 592 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 593 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 594 595 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 596 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 597 598 /* If we have the good data in hand, this function can be used */ 599 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 600 struct zio *zio, uint64_t offset, uint64_t length, 601 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 602 603 /* Called from spa_sync(), but primarily an injection handler */ 604 extern void spa_handle_ignored_writes(spa_t *spa); 605 606 /* zbookmark_phys functions */ 607 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp, 608 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block); 609 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, 610 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 611 612 #ifdef __cplusplus 613 } 614 #endif 615 616 #endif /* _ZIO_H */ 617