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_CANFAIL) 210 211 enum zio_child { 212 ZIO_CHILD_VDEV = 0, 213 ZIO_CHILD_GANG, 214 ZIO_CHILD_DDT, 215 ZIO_CHILD_LOGICAL, 216 ZIO_CHILD_TYPES 217 }; 218 219 enum zio_wait_type { 220 ZIO_WAIT_READY = 0, 221 ZIO_WAIT_DONE, 222 ZIO_WAIT_TYPES 223 }; 224 225 /* 226 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 227 * graveyard) to indicate checksum errors and fragmentation. 228 */ 229 #define ECKSUM EBADE 230 #define EFRAGS EBADR 231 232 typedef void zio_done_func_t(zio_t *zio); 233 234 extern boolean_t zio_dva_throttle_enabled; 235 extern const char *zio_type_name[ZIO_TYPES]; 236 237 /* 238 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 239 * identifies any block in the pool. By convention, the meta-objset (MOS) 240 * is objset 0, and the meta-dnode is object 0. This covers all blocks 241 * except root blocks and ZIL blocks, which are defined as follows: 242 * 243 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 244 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 245 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 246 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>. 247 * 248 * Note: this structure is called a bookmark because its original purpose 249 * was to remember where to resume a pool-wide traverse. 250 * 251 * Note: this structure is passed between userland and the kernel, and is 252 * stored on disk (by virtue of being incorporated into other on-disk 253 * structures, e.g. dsl_scan_phys_t). 254 */ 255 typedef struct zbookmark_phys { 256 uint64_t zb_objset; 257 uint64_t zb_object; 258 int64_t zb_level; 259 uint64_t zb_blkid; 260 } zbookmark_phys_t; 261 262 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 263 { \ 264 (zb)->zb_objset = objset; \ 265 (zb)->zb_object = object; \ 266 (zb)->zb_level = level; \ 267 (zb)->zb_blkid = blkid; \ 268 } 269 270 #define ZB_DESTROYED_OBJSET (-1ULL) 271 272 #define ZB_ROOT_OBJECT (0ULL) 273 #define ZB_ROOT_LEVEL (-1LL) 274 #define ZB_ROOT_BLKID (0ULL) 275 276 #define ZB_ZIL_OBJECT (0ULL) 277 #define ZB_ZIL_LEVEL (-2LL) 278 279 #define ZB_DNODE_LEVEL (-3LL) 280 #define ZB_DNODE_BLKID (0ULL) 281 282 #define ZB_IS_ZERO(zb) \ 283 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 284 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 285 #define ZB_IS_ROOT(zb) \ 286 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 287 (zb)->zb_level == ZB_ROOT_LEVEL && \ 288 (zb)->zb_blkid == ZB_ROOT_BLKID) 289 290 typedef struct zio_prop { 291 enum zio_checksum zp_checksum; 292 enum zio_compress zp_compress; 293 dmu_object_type_t zp_type; 294 uint8_t zp_level; 295 uint8_t zp_copies; 296 boolean_t zp_dedup; 297 boolean_t zp_dedup_verify; 298 boolean_t zp_nopwrite; 299 } zio_prop_t; 300 301 typedef struct zio_cksum_report zio_cksum_report_t; 302 303 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 304 const void *good_data); 305 typedef void zio_cksum_free_f(void *cbdata, size_t size); 306 307 struct zio_bad_cksum; /* defined in zio_checksum.h */ 308 struct dnode_phys; 309 struct abd; 310 311 struct zio_cksum_report { 312 struct zio_cksum_report *zcr_next; 313 nvlist_t *zcr_ereport; 314 nvlist_t *zcr_detector; 315 void *zcr_cbdata; 316 size_t zcr_cbinfo; /* passed to zcr_free() */ 317 uint64_t zcr_align; 318 uint64_t zcr_length; 319 zio_cksum_finish_f *zcr_finish; 320 zio_cksum_free_f *zcr_free; 321 322 /* internal use only */ 323 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 324 }; 325 326 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 327 void *arg); 328 329 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 330 331 typedef struct zio_vsd_ops { 332 zio_done_func_t *vsd_free; 333 zio_vsd_cksum_report_f *vsd_cksum_report; 334 } zio_vsd_ops_t; 335 336 typedef struct zio_gang_node { 337 zio_gbh_phys_t *gn_gbh; 338 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 339 } zio_gang_node_t; 340 341 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 342 zio_gang_node_t *gn, struct abd *data, uint64_t offset); 343 344 typedef void zio_transform_func_t(zio_t *zio, struct abd *data, uint64_t size); 345 346 typedef struct zio_transform { 347 struct abd *zt_orig_abd; 348 uint64_t zt_orig_size; 349 uint64_t zt_bufsize; 350 zio_transform_func_t *zt_transform; 351 struct zio_transform *zt_next; 352 } zio_transform_t; 353 354 typedef int zio_pipe_stage_t(zio_t *zio); 355 356 /* 357 * The io_reexecute flags are distinct from io_flags because the child must 358 * be able to propagate them to the parent. The normal io_flags are local 359 * to the zio, not protected by any lock, and not modifiable by children; 360 * the reexecute flags are protected by io_lock, modifiable by children, 361 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 362 */ 363 #define ZIO_REEXECUTE_NOW 0x01 364 #define ZIO_REEXECUTE_SUSPEND 0x02 365 366 typedef struct zio_alloc_list { 367 list_t zal_list; 368 uint64_t zal_size; 369 } zio_alloc_list_t; 370 371 typedef struct zio_link { 372 zio_t *zl_parent; 373 zio_t *zl_child; 374 list_node_t zl_parent_node; 375 list_node_t zl_child_node; 376 } zio_link_t; 377 378 struct zio { 379 /* Core information about this I/O */ 380 zbookmark_phys_t io_bookmark; 381 zio_prop_t io_prop; 382 zio_type_t io_type; 383 enum zio_child io_child_type; 384 int io_cmd; 385 zio_priority_t io_priority; 386 uint8_t io_reexecute; 387 uint8_t io_state[ZIO_WAIT_TYPES]; 388 uint64_t io_txg; 389 spa_t *io_spa; 390 blkptr_t *io_bp; 391 blkptr_t *io_bp_override; 392 blkptr_t io_bp_copy; 393 list_t io_parent_list; 394 list_t io_child_list; 395 zio_t *io_logical; 396 zio_transform_t *io_transform_stack; 397 398 /* Callback info */ 399 zio_done_func_t *io_ready; 400 zio_done_func_t *io_children_ready; 401 zio_done_func_t *io_physdone; 402 zio_done_func_t *io_done; 403 void *io_private; 404 int64_t io_prev_space_delta; /* DMU private */ 405 blkptr_t io_bp_orig; 406 407 /* Data represented by this I/O */ 408 struct abd *io_abd; 409 struct abd *io_orig_abd; 410 uint64_t io_size; 411 uint64_t io_orig_size; 412 /* io_lsize != io_orig_size iff this is a raw write */ 413 uint64_t io_lsize; 414 415 /* Stuff for the vdev stack */ 416 vdev_t *io_vd; 417 void *io_vsd; 418 const zio_vsd_ops_t *io_vsd_ops; 419 420 uint64_t io_offset; 421 hrtime_t io_timestamp; 422 hrtime_t io_queued_timestamp; 423 hrtime_t io_target_timestamp; 424 avl_node_t io_queue_node; 425 avl_node_t io_offset_node; 426 avl_node_t io_alloc_node; 427 zio_alloc_list_t io_alloc_list; 428 429 /* Internal pipeline state */ 430 enum zio_flag io_flags; 431 enum zio_stage io_stage; 432 enum zio_stage io_pipeline; 433 enum zio_flag io_orig_flags; 434 enum zio_stage io_orig_stage; 435 enum zio_stage io_orig_pipeline; 436 enum zio_stage io_pipeline_trace; 437 int io_error; 438 int io_child_error[ZIO_CHILD_TYPES]; 439 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 440 uint64_t io_child_count; 441 uint64_t io_phys_children; 442 uint64_t io_parent_count; 443 uint64_t *io_stall; 444 zio_t *io_gang_leader; 445 zio_gang_node_t *io_gang_tree; 446 void *io_executor; 447 void *io_waiter; 448 kmutex_t io_lock; 449 kcondvar_t io_cv; 450 451 /* FMA state */ 452 zio_cksum_report_t *io_cksum_report; 453 uint64_t io_ena; 454 455 /* Taskq dispatching state */ 456 taskq_ent_t io_tqent; 457 }; 458 459 extern int zio_bookmark_compare(const void *, const void *); 460 461 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 462 zio_done_func_t *done, void *private, enum zio_flag flags); 463 464 extern zio_t *zio_root(spa_t *spa, 465 zio_done_func_t *done, void *private, enum zio_flag flags); 466 467 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, 468 struct abd *data, uint64_t lsize, zio_done_func_t *done, void *private, 469 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 470 471 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 472 struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp, 473 zio_done_func_t *ready, zio_done_func_t *children_ready, 474 zio_done_func_t *physdone, zio_done_func_t *done, 475 void *private, zio_priority_t priority, enum zio_flag flags, 476 const zbookmark_phys_t *zb); 477 478 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 479 struct abd *data, uint64_t size, zio_done_func_t *done, void *private, 480 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 481 482 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 483 boolean_t nopwrite); 484 485 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 486 487 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 488 const blkptr_t *bp, 489 zio_done_func_t *done, void *private, enum zio_flag flags); 490 491 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 492 zio_done_func_t *done, void *private, enum zio_flag flags); 493 494 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 495 uint64_t size, struct abd *data, int checksum, 496 zio_done_func_t *done, void *private, zio_priority_t priority, 497 enum zio_flag flags, boolean_t labels); 498 499 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 500 uint64_t size, struct abd *data, int checksum, 501 zio_done_func_t *done, void *private, zio_priority_t priority, 502 enum zio_flag flags, boolean_t labels); 503 504 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 505 const blkptr_t *bp, enum zio_flag flags); 506 507 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 508 blkptr_t *old_bp, uint64_t size, boolean_t *slog); 509 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 510 extern void zio_flush(zio_t *zio, vdev_t *vd); 511 extern void zio_shrink(zio_t *zio, uint64_t size); 512 513 extern int zio_wait(zio_t *zio); 514 extern void zio_nowait(zio_t *zio); 515 extern void zio_execute(zio_t *zio); 516 extern void zio_interrupt(zio_t *zio); 517 extern void zio_delay_init(zio_t *zio); 518 extern void zio_delay_interrupt(zio_t *zio); 519 520 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **); 521 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **); 522 extern zio_t *zio_unique_parent(zio_t *cio); 523 extern void zio_add_child(zio_t *pio, zio_t *cio); 524 525 extern void *zio_buf_alloc(size_t size); 526 extern void zio_buf_free(void *buf, size_t size); 527 extern void *zio_data_buf_alloc(size_t size); 528 extern void zio_data_buf_free(void *buf, size_t size); 529 530 extern void zio_push_transform(zio_t *zio, struct abd *abd, uint64_t size, 531 uint64_t bufsize, zio_transform_func_t *transform); 532 extern void zio_pop_transforms(zio_t *zio); 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, struct abd *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 struct abd *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