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 * 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, 176 177 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 178 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 179 180 /* 181 * Flags inherited by vdev children. 182 */ 183 ZIO_FLAG_IO_RETRY = 1 << 14, /* must be first for INHERIT */ 184 ZIO_FLAG_PROBE = 1 << 15, 185 ZIO_FLAG_TRYHARD = 1 << 16, 186 ZIO_FLAG_OPTIONAL = 1 << 17, 187 188 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 189 190 /* 191 * Flags not inherited by any children. 192 */ 193 ZIO_FLAG_DONT_QUEUE = 1 << 18, /* must be first for INHERIT */ 194 ZIO_FLAG_DONT_PROPAGATE = 1 << 19, 195 ZIO_FLAG_IO_BYPASS = 1 << 20, 196 ZIO_FLAG_IO_REWRITE = 1 << 21, 197 ZIO_FLAG_RAW = 1 << 22, 198 ZIO_FLAG_GANG_CHILD = 1 << 23, 199 ZIO_FLAG_DDT_CHILD = 1 << 24, 200 ZIO_FLAG_GODFATHER = 1 << 25, 201 ZIO_FLAG_NOPWRITE = 1 << 26, 202 ZIO_FLAG_REEXECUTED = 1 << 27, 203 ZIO_FLAG_DELEGATED = 1 << 28, 204 }; 205 206 #define ZIO_FLAG_MUSTSUCCEED 0 207 208 #define ZIO_DDT_CHILD_FLAGS(zio) \ 209 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 210 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 211 212 #define ZIO_GANG_CHILD_FLAGS(zio) \ 213 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 214 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 215 216 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 217 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 218 ZIO_FLAG_CANFAIL) 219 220 #define ZIO_CHILD_BIT(x) (1 << (x)) 221 #define ZIO_CHILD_BIT_IS_SET(val, x) ((val) & (1 << (x))) 222 223 enum zio_child { 224 ZIO_CHILD_VDEV = 0, 225 ZIO_CHILD_GANG, 226 ZIO_CHILD_DDT, 227 ZIO_CHILD_LOGICAL, 228 ZIO_CHILD_TYPES 229 }; 230 231 #define ZIO_CHILD_VDEV_BIT ZIO_CHILD_BIT(ZIO_CHILD_VDEV) 232 #define ZIO_CHILD_GANG_BIT ZIO_CHILD_BIT(ZIO_CHILD_GANG) 233 #define ZIO_CHILD_DDT_BIT ZIO_CHILD_BIT(ZIO_CHILD_DDT) 234 #define ZIO_CHILD_LOGICAL_BIT ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL) 235 #define ZIO_CHILD_ALL_BITS \ 236 (ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT | \ 237 ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT) 238 239 enum zio_wait_type { 240 ZIO_WAIT_READY = 0, 241 ZIO_WAIT_DONE, 242 ZIO_WAIT_TYPES 243 }; 244 245 /* 246 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 247 * graveyard) to indicate checksum errors and fragmentation. 248 */ 249 #define ECKSUM EBADE 250 #define EFRAGS EBADR 251 252 typedef void zio_done_func_t(zio_t *zio); 253 254 extern const char *zio_type_name[ZIO_TYPES]; 255 256 /* 257 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 258 * identifies any block in the pool. By convention, the meta-objset (MOS) 259 * is objset 0, and the meta-dnode is object 0. This covers all blocks 260 * except root blocks and ZIL blocks, which are defined as follows: 261 * 262 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 263 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 264 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 265 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>. 266 * 267 * Note: this structure is called a bookmark because its original purpose 268 * was to remember where to resume a pool-wide traverse. 269 * 270 * Note: this structure is passed between userland and the kernel, and is 271 * stored on disk (by virtue of being incorporated into other on-disk 272 * structures, e.g. dsl_scan_phys_t). 273 */ 274 typedef struct zbookmark_phys { 275 uint64_t zb_objset; 276 uint64_t zb_object; 277 int64_t zb_level; 278 uint64_t zb_blkid; 279 } zbookmark_phys_t; 280 281 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 282 { \ 283 (zb)->zb_objset = objset; \ 284 (zb)->zb_object = object; \ 285 (zb)->zb_level = level; \ 286 (zb)->zb_blkid = blkid; \ 287 } 288 289 #define ZB_DESTROYED_OBJSET (-1ULL) 290 291 #define ZB_ROOT_OBJECT (0ULL) 292 #define ZB_ROOT_LEVEL (-1LL) 293 #define ZB_ROOT_BLKID (0ULL) 294 295 #define ZB_ZIL_OBJECT (0ULL) 296 #define ZB_ZIL_LEVEL (-2LL) 297 298 #define ZB_DNODE_LEVEL (-3LL) 299 #define ZB_DNODE_BLKID (0ULL) 300 301 #define ZB_IS_ZERO(zb) \ 302 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 303 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 304 #define ZB_IS_ROOT(zb) \ 305 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 306 (zb)->zb_level == ZB_ROOT_LEVEL && \ 307 (zb)->zb_blkid == ZB_ROOT_BLKID) 308 309 typedef struct zio_prop { 310 enum zio_checksum zp_checksum; 311 enum zio_compress zp_compress; 312 dmu_object_type_t zp_type; 313 uint8_t zp_level; 314 uint8_t zp_copies; 315 boolean_t zp_dedup; 316 boolean_t zp_dedup_verify; 317 boolean_t zp_nopwrite; 318 } zio_prop_t; 319 320 typedef struct zio_cksum_report zio_cksum_report_t; 321 322 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 323 const void *good_data); 324 typedef void zio_cksum_free_f(void *cbdata, size_t size); 325 326 struct zio_bad_cksum; /* defined in zio_checksum.h */ 327 struct dnode_phys; 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, void *data); 361 362 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 363 364 typedef struct zio_transform { 365 void *zt_orig_data; 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_link { 385 zio_t *zl_parent; 386 zio_t *zl_child; 387 list_node_t zl_parent_node; 388 list_node_t zl_child_node; 389 } zio_link_t; 390 391 struct zio { 392 /* Core information about this I/O */ 393 zbookmark_phys_t io_bookmark; 394 zio_prop_t io_prop; 395 zio_type_t io_type; 396 enum zio_child io_child_type; 397 int io_cmd; 398 zio_priority_t io_priority; 399 uint8_t io_reexecute; 400 uint8_t io_state[ZIO_WAIT_TYPES]; 401 uint64_t io_txg; 402 spa_t *io_spa; 403 blkptr_t *io_bp; 404 blkptr_t *io_bp_override; 405 blkptr_t io_bp_copy; 406 list_t io_parent_list; 407 list_t io_child_list; 408 zio_link_t *io_walk_link; 409 zio_t *io_logical; 410 zio_transform_t *io_transform_stack; 411 412 /* Callback info */ 413 zio_done_func_t *io_ready; 414 zio_done_func_t *io_physdone; 415 zio_done_func_t *io_done; 416 void *io_private; 417 int64_t io_prev_space_delta; /* DMU private */ 418 blkptr_t io_bp_orig; 419 420 /* Data represented by this I/O */ 421 void *io_data; 422 void *io_orig_data; 423 uint64_t io_size; 424 uint64_t io_orig_size; 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_target_timestamp; 434 avl_node_t io_queue_node; 435 avl_node_t io_offset_node; 436 437 /* Internal pipeline state */ 438 enum zio_flag io_flags; 439 enum zio_stage io_stage; 440 enum zio_stage io_pipeline; 441 enum zio_flag io_orig_flags; 442 enum zio_stage io_orig_stage; 443 enum zio_stage io_orig_pipeline; 444 int io_error; 445 int io_child_error[ZIO_CHILD_TYPES]; 446 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 447 uint64_t io_child_count; 448 uint64_t io_phys_children; 449 uint64_t io_parent_count; 450 uint64_t *io_stall; 451 zio_t *io_gang_leader; 452 zio_gang_node_t *io_gang_tree; 453 void *io_executor; 454 void *io_waiter; 455 kmutex_t io_lock; 456 kcondvar_t io_cv; 457 458 /* FMA state */ 459 zio_cksum_report_t *io_cksum_report; 460 uint64_t io_ena; 461 462 /* Taskq dispatching state */ 463 taskq_ent_t io_tqent; 464 }; 465 466 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 467 zio_done_func_t *done, void *private, enum zio_flag flags); 468 469 extern zio_t *zio_root(spa_t *spa, 470 zio_done_func_t *done, void *private, enum zio_flag flags); 471 472 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 473 uint64_t size, zio_done_func_t *done, void *private, 474 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 475 476 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 477 void *data, uint64_t size, const zio_prop_t *zp, 478 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, 479 void *private, 480 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 481 482 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 483 void *data, uint64_t size, zio_done_func_t *done, void *private, 484 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 485 486 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 487 boolean_t nopwrite); 488 489 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 490 491 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 492 const blkptr_t *bp, 493 zio_done_func_t *done, void *private, enum zio_flag flags); 494 495 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 496 zio_done_func_t *done, void *private, enum zio_flag flags); 497 498 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 499 uint64_t size, void *data, int checksum, 500 zio_done_func_t *done, void *private, zio_priority_t priority, 501 enum zio_flag flags, boolean_t labels); 502 503 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 504 uint64_t size, void *data, int checksum, 505 zio_done_func_t *done, void *private, zio_priority_t priority, 506 enum zio_flag flags, boolean_t labels); 507 508 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 509 const blkptr_t *bp, enum zio_flag flags); 510 511 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 512 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 513 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 514 extern void zio_flush(zio_t *zio, vdev_t *vd); 515 extern void zio_shrink(zio_t *zio, uint64_t size); 516 517 extern int zio_wait(zio_t *zio); 518 extern void zio_nowait(zio_t *zio); 519 extern void zio_execute(zio_t *zio); 520 extern void zio_interrupt(zio_t *zio); 521 extern void zio_delay_init(zio_t *zio); 522 extern void zio_delay_interrupt(zio_t *zio); 523 524 extern zio_t *zio_walk_parents(zio_t *cio); 525 extern zio_t *zio_walk_children(zio_t *pio); 526 extern zio_t *zio_unique_parent(zio_t *cio); 527 extern void zio_add_child(zio_t *pio, zio_t *cio); 528 529 extern void *zio_buf_alloc(size_t size); 530 extern void zio_buf_free(void *buf, size_t size); 531 extern void *zio_data_buf_alloc(size_t size); 532 extern void zio_data_buf_free(void *buf, size_t size); 533 534 extern void zio_resubmit_stage_async(void *); 535 536 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 537 uint64_t offset, void *data, uint64_t size, int type, 538 zio_priority_t priority, enum zio_flag flags, 539 zio_done_func_t *done, void *private); 540 541 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 542 void *data, uint64_t size, int type, zio_priority_t priority, 543 enum zio_flag flags, zio_done_func_t *done, void *private); 544 545 extern void zio_vdev_io_bypass(zio_t *zio); 546 extern void zio_vdev_io_reissue(zio_t *zio); 547 extern void zio_vdev_io_redone(zio_t *zio); 548 549 extern void zio_checksum_verified(zio_t *zio); 550 extern int zio_worst_error(int e1, int e2); 551 552 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 553 enum zio_checksum parent); 554 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 555 enum zio_checksum child, enum zio_checksum parent); 556 extern enum zio_compress zio_compress_select(spa_t *spa, 557 enum zio_compress child, enum zio_compress parent); 558 559 extern void zio_suspend(spa_t *spa, zio_t *zio); 560 extern int zio_resume(spa_t *spa); 561 extern void zio_resume_wait(spa_t *spa); 562 563 /* 564 * Initial setup and teardown. 565 */ 566 extern void zio_init(void); 567 extern void zio_fini(void); 568 569 /* 570 * Fault injection 571 */ 572 struct zinject_record; 573 extern uint32_t zio_injection_enabled; 574 extern int zio_inject_fault(char *name, int flags, int *id, 575 struct zinject_record *record); 576 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 577 struct zinject_record *record); 578 extern int zio_clear_fault(int id); 579 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 580 extern int zio_handle_fault_injection(zio_t *zio, int error); 581 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 582 extern int zio_handle_label_injection(zio_t *zio, int error); 583 extern void zio_handle_ignored_writes(zio_t *zio); 584 extern hrtime_t zio_handle_io_delay(zio_t *zio); 585 586 /* 587 * Checksum ereport functions 588 */ 589 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 590 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 591 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 592 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 593 594 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 595 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 596 597 /* If we have the good data in hand, this function can be used */ 598 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 599 struct zio *zio, uint64_t offset, uint64_t length, 600 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 601 602 /* Called from spa_sync(), but primarily an injection handler */ 603 extern void spa_handle_ignored_writes(spa_t *spa); 604 605 /* zbookmark_phys functions */ 606 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp, 607 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block); 608 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, 609 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 610 611 #ifdef __cplusplus 612 } 613 #endif 614 615 #endif /* _ZIO_H */ 616