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 by Delphix. All rights reserved. 26 * Copyright (c) 2013 by Delphix. All rights reserved. 27 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 28 * Copyright (c) 2013, Joyent, Inc. All rights reserved. 29 */ 30 31 #ifndef _ZIO_H 32 #define _ZIO_H 33 34 #include <sys/zfs_context.h> 35 #include <sys/spa.h> 36 #include <sys/txg.h> 37 #include <sys/avl.h> 38 #include <sys/kstat.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_FUNCTIONS 87 }; 88 89 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 90 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 91 92 #define ZIO_CHECKSUM_MASK 0xffULL 93 #define ZIO_CHECKSUM_VERIFY (1 << 8) 94 95 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 96 #define ZIO_DEDUPDITTO_MIN 100 97 98 enum zio_compress { 99 ZIO_COMPRESS_INHERIT = 0, 100 ZIO_COMPRESS_ON, 101 ZIO_COMPRESS_OFF, 102 ZIO_COMPRESS_LZJB, 103 ZIO_COMPRESS_EMPTY, 104 ZIO_COMPRESS_GZIP_1, 105 ZIO_COMPRESS_GZIP_2, 106 ZIO_COMPRESS_GZIP_3, 107 ZIO_COMPRESS_GZIP_4, 108 ZIO_COMPRESS_GZIP_5, 109 ZIO_COMPRESS_GZIP_6, 110 ZIO_COMPRESS_GZIP_7, 111 ZIO_COMPRESS_GZIP_8, 112 ZIO_COMPRESS_GZIP_9, 113 ZIO_COMPRESS_ZLE, 114 ZIO_COMPRESS_LZ4, 115 ZIO_COMPRESS_FUNCTIONS 116 }; 117 118 /* N.B. when altering this value, also change BOOTFS_COMPRESS_VALID below */ 119 #define ZIO_COMPRESS_ON_VALUE ZIO_COMPRESS_LZJB 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_ON && \ 126 ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) || \ 127 (compress) == ZIO_COMPRESS_OFF) 128 129 #define ZIO_FAILURE_MODE_WAIT 0 130 #define ZIO_FAILURE_MODE_CONTINUE 1 131 #define ZIO_FAILURE_MODE_PANIC 2 132 133 typedef enum zio_priority { 134 ZIO_PRIORITY_SYNC_READ, 135 ZIO_PRIORITY_SYNC_WRITE, /* ZIL */ 136 ZIO_PRIORITY_ASYNC_READ, /* prefetch */ 137 ZIO_PRIORITY_ASYNC_WRITE, /* spa_sync() */ 138 ZIO_PRIORITY_SCRUB, /* asynchronous scrub/resilver reads */ 139 ZIO_PRIORITY_NUM_QUEUEABLE, 140 141 ZIO_PRIORITY_NOW /* non-queued i/os (e.g. free) */ 142 } zio_priority_t; 143 144 #define ZIO_PIPELINE_CONTINUE 0x100 145 #define ZIO_PIPELINE_STOP 0x101 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, 158 159 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 160 161 /* 162 * Flags inherited by ddt, gang, and vdev children. 163 */ 164 ZIO_FLAG_CANFAIL = 1 << 6, /* must be first for INHERIT */ 165 ZIO_FLAG_SPECULATIVE = 1 << 7, 166 ZIO_FLAG_CONFIG_WRITER = 1 << 8, 167 ZIO_FLAG_DONT_RETRY = 1 << 9, 168 ZIO_FLAG_DONT_CACHE = 1 << 10, 169 ZIO_FLAG_NODATA = 1 << 11, 170 ZIO_FLAG_INDUCE_DAMAGE = 1 << 12, 171 172 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 173 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 174 175 /* 176 * Flags inherited by vdev children. 177 */ 178 ZIO_FLAG_IO_RETRY = 1 << 13, /* must be first for INHERIT */ 179 ZIO_FLAG_PROBE = 1 << 14, 180 ZIO_FLAG_TRYHARD = 1 << 15, 181 ZIO_FLAG_OPTIONAL = 1 << 16, 182 183 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 184 185 /* 186 * Flags not inherited by any children. 187 */ 188 ZIO_FLAG_DONT_QUEUE = 1 << 17, /* must be first for INHERIT */ 189 ZIO_FLAG_DONT_PROPAGATE = 1 << 18, 190 ZIO_FLAG_IO_BYPASS = 1 << 19, 191 ZIO_FLAG_IO_REWRITE = 1 << 20, 192 ZIO_FLAG_RAW = 1 << 21, 193 ZIO_FLAG_GANG_CHILD = 1 << 22, 194 ZIO_FLAG_DDT_CHILD = 1 << 23, 195 ZIO_FLAG_GODFATHER = 1 << 24, 196 ZIO_FLAG_NOPWRITE = 1 << 25, 197 ZIO_FLAG_REEXECUTED = 1 << 26, 198 ZIO_FLAG_DELEGATED = 1 << 27, 199 }; 200 201 #define ZIO_FLAG_MUSTSUCCEED 0 202 203 #define ZIO_DDT_CHILD_FLAGS(zio) \ 204 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 205 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 206 207 #define ZIO_GANG_CHILD_FLAGS(zio) \ 208 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 209 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 210 211 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 212 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 213 ZIO_FLAG_CANFAIL) 214 215 enum zio_child { 216 ZIO_CHILD_VDEV = 0, 217 ZIO_CHILD_GANG, 218 ZIO_CHILD_DDT, 219 ZIO_CHILD_LOGICAL, 220 ZIO_CHILD_TYPES 221 }; 222 223 enum zio_wait_type { 224 ZIO_WAIT_READY = 0, 225 ZIO_WAIT_DONE, 226 ZIO_WAIT_TYPES 227 }; 228 229 /* 230 * We'll take the number 122 and 123 to indicate checksum errors and 231 * fragmentation. Those doesn't collide with any errno values as they 232 * are greater than ELAST. 233 */ 234 #define ECKSUM 122 235 #define EFRAGS 123 236 237 typedef void zio_done_func_t(zio_t *zio); 238 239 extern const char *zio_type_name[ZIO_TYPES]; 240 241 /* 242 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 243 * identifies any block in the pool. By convention, the meta-objset (MOS) 244 * is objset 0, and the meta-dnode is object 0. This covers all blocks 245 * except root blocks and ZIL blocks, which are defined as follows: 246 * 247 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 248 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 249 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 250 * 251 * Note: this structure is called a bookmark because its original purpose 252 * was to remember where to resume a pool-wide traverse. 253 * 254 * Note: this structure is passed between userland and the kernel. 255 * Therefore it must not change size or alignment between 32/64 bit 256 * compilation options. 257 */ 258 typedef struct zbookmark { 259 uint64_t zb_objset; 260 uint64_t zb_object; 261 int64_t zb_level; 262 uint64_t zb_blkid; 263 } zbookmark_t; 264 265 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 266 { \ 267 (zb)->zb_objset = objset; \ 268 (zb)->zb_object = object; \ 269 (zb)->zb_level = level; \ 270 (zb)->zb_blkid = blkid; \ 271 } 272 273 #define ZB_DESTROYED_OBJSET (-1ULL) 274 275 #define ZB_ROOT_OBJECT (0ULL) 276 #define ZB_ROOT_LEVEL (-1LL) 277 #define ZB_ROOT_BLKID (0ULL) 278 279 #define ZB_ZIL_OBJECT (0ULL) 280 #define ZB_ZIL_LEVEL (-2LL) 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; 309 310 struct zio_cksum_report { 311 struct zio_cksum_report *zcr_next; 312 nvlist_t *zcr_ereport; 313 nvlist_t *zcr_detector; 314 void *zcr_cbdata; 315 size_t zcr_cbinfo; /* passed to zcr_free() */ 316 uint64_t zcr_align; 317 uint64_t zcr_length; 318 zio_cksum_finish_f *zcr_finish; 319 zio_cksum_free_f *zcr_free; 320 321 /* internal use only */ 322 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 323 }; 324 325 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 326 void *arg); 327 328 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 329 330 typedef struct zio_vsd_ops { 331 zio_done_func_t *vsd_free; 332 zio_vsd_cksum_report_f *vsd_cksum_report; 333 } zio_vsd_ops_t; 334 335 typedef struct zio_gang_node { 336 zio_gbh_phys_t *gn_gbh; 337 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 338 } zio_gang_node_t; 339 340 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 341 zio_gang_node_t *gn, void *data); 342 343 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 344 345 typedef struct zio_transform { 346 void *zt_orig_data; 347 uint64_t zt_orig_size; 348 uint64_t zt_bufsize; 349 zio_transform_func_t *zt_transform; 350 struct zio_transform *zt_next; 351 } zio_transform_t; 352 353 typedef int zio_pipe_stage_t(zio_t **ziop); 354 355 /* 356 * The io_reexecute flags are distinct from io_flags because the child must 357 * be able to propagate them to the parent. The normal io_flags are local 358 * to the zio, not protected by any lock, and not modifiable by children; 359 * the reexecute flags are protected by io_lock, modifiable by children, 360 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 361 */ 362 #define ZIO_REEXECUTE_NOW 0x01 363 #define ZIO_REEXECUTE_SUSPEND 0x02 364 365 typedef struct zio_link { 366 zio_t *zl_parent; 367 zio_t *zl_child; 368 list_node_t zl_parent_node; 369 list_node_t zl_child_node; 370 } zio_link_t; 371 372 /* 373 * Used for TRIM kstat. 374 */ 375 typedef struct zio_trim_stats { 376 /* 377 * Number of bytes successfully TRIMmed. 378 */ 379 kstat_named_t bytes; 380 381 /* 382 * Number of successful TRIM requests. 383 */ 384 kstat_named_t success; 385 386 /* 387 * Number of TRIM requests that failed because TRIM is not 388 * supported. 389 */ 390 kstat_named_t unsupported; 391 392 /* 393 * Number of TRIM requests that failed for other reasons. 394 */ 395 kstat_named_t failed; 396 } zio_trim_stats_t; 397 398 extern zio_trim_stats_t zio_trim_stats; 399 400 #define ZIO_TRIM_STAT_INCR(stat, val) \ 401 atomic_add_64(&zio_trim_stats.stat.value.ui64, (val)); 402 #define ZIO_TRIM_STAT_BUMP(stat) \ 403 ZIO_TRIM_STAT_INCR(stat, 1); 404 405 struct zio { 406 /* Core information about this I/O */ 407 zbookmark_t io_bookmark; 408 zio_prop_t io_prop; 409 zio_type_t io_type; 410 enum zio_child io_child_type; 411 int io_cmd; 412 zio_priority_t io_priority; 413 uint8_t io_reexecute; 414 uint8_t io_state[ZIO_WAIT_TYPES]; 415 uint64_t io_txg; 416 spa_t *io_spa; 417 blkptr_t *io_bp; 418 blkptr_t *io_bp_override; 419 blkptr_t io_bp_copy; 420 list_t io_parent_list; 421 list_t io_child_list; 422 zio_link_t *io_walk_link; 423 zio_t *io_logical; 424 zio_transform_t *io_transform_stack; 425 426 /* Callback info */ 427 zio_done_func_t *io_ready; 428 zio_done_func_t *io_physdone; 429 zio_done_func_t *io_done; 430 void *io_private; 431 int64_t io_prev_space_delta; /* DMU private */ 432 blkptr_t io_bp_orig; 433 434 /* Data represented by this I/O */ 435 void *io_data; 436 void *io_orig_data; 437 uint64_t io_size; 438 uint64_t io_orig_size; 439 440 /* Stuff for the vdev stack */ 441 vdev_t *io_vd; 442 void *io_vsd; 443 const zio_vsd_ops_t *io_vsd_ops; 444 445 uint64_t io_offset; 446 hrtime_t io_timestamp; 447 avl_node_t io_queue_node; 448 449 /* Internal pipeline state */ 450 enum zio_flag io_flags; 451 enum zio_stage io_stage; 452 enum zio_stage io_pipeline; 453 enum zio_flag io_orig_flags; 454 enum zio_stage io_orig_stage; 455 enum zio_stage io_orig_pipeline; 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; 469 470 /* FMA state */ 471 zio_cksum_report_t *io_cksum_report; 472 uint64_t io_ena; 473 474 /* Taskq dispatching state */ 475 taskq_ent_t io_tqent; 476 477 avl_node_t io_trim_node; 478 list_node_t io_trim_link; 479 }; 480 481 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 482 zio_done_func_t *done, void *priv, enum zio_flag flags); 483 484 extern zio_t *zio_root(spa_t *spa, 485 zio_done_func_t *done, void *priv, enum zio_flag flags); 486 487 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 488 uint64_t size, zio_done_func_t *done, void *priv, 489 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb); 490 491 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 492 void *data, uint64_t size, const zio_prop_t *zp, 493 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, 494 void *priv, 495 zio_priority_t priority, enum zio_flag flags, const zbookmark_t *zb); 496 497 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 498 void *data, uint64_t size, zio_done_func_t *done, void *priv, 499 zio_priority_t priority, enum zio_flag flags, zbookmark_t *zb); 500 501 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 502 boolean_t nopwrite); 503 504 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 505 506 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 507 const blkptr_t *bp, 508 zio_done_func_t *done, void *priv, enum zio_flag flags); 509 510 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 511 uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv, 512 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, void *data, int checksum, 516 zio_done_func_t *done, void *priv, 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, void *data, int checksum, 521 zio_done_func_t *done, void *priv, 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, uint64_t size, enum zio_flag flags); 526 527 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 528 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 529 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 530 extern void zio_flush(zio_t *zio, vdev_t *vd); 531 extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset, 532 uint64_t size); 533 extern void zio_shrink(zio_t *zio, uint64_t size); 534 535 extern int zio_wait(zio_t *zio); 536 extern void zio_nowait(zio_t *zio); 537 extern void zio_execute(zio_t *zio); 538 extern void zio_interrupt(zio_t *zio); 539 540 extern zio_t *zio_walk_parents(zio_t *cio); 541 extern zio_t *zio_walk_children(zio_t *pio); 542 extern zio_t *zio_unique_parent(zio_t *cio); 543 extern void zio_add_child(zio_t *pio, zio_t *cio); 544 545 extern void *zio_buf_alloc(size_t size); 546 extern void zio_buf_free(void *buf, size_t size); 547 extern void *zio_data_buf_alloc(size_t size); 548 extern void zio_data_buf_free(void *buf, size_t size); 549 550 extern void zio_resubmit_stage_async(void *); 551 552 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 553 uint64_t offset, void *data, uint64_t size, int type, 554 zio_priority_t priority, enum zio_flag flags, 555 zio_done_func_t *done, void *priv); 556 557 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 558 void *data, uint64_t size, int type, zio_priority_t priority, 559 enum zio_flag flags, zio_done_func_t *done, void *priv); 560 561 extern void zio_vdev_io_bypass(zio_t *zio); 562 extern void zio_vdev_io_reissue(zio_t *zio); 563 extern void zio_vdev_io_redone(zio_t *zio); 564 565 extern void zio_checksum_verified(zio_t *zio); 566 extern int zio_worst_error(int e1, int e2); 567 568 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 569 enum zio_checksum parent); 570 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 571 enum zio_checksum child, enum zio_checksum parent); 572 extern enum zio_compress zio_compress_select(enum zio_compress child, 573 enum zio_compress parent); 574 575 extern void zio_suspend(spa_t *spa, zio_t *zio); 576 extern int zio_resume(spa_t *spa); 577 extern void zio_resume_wait(spa_t *spa); 578 579 /* 580 * Initial setup and teardown. 581 */ 582 extern void zio_init(void); 583 extern void zio_fini(void); 584 585 /* 586 * Fault injection 587 */ 588 struct zinject_record; 589 extern uint32_t zio_injection_enabled; 590 extern int zio_inject_fault(char *name, int flags, int *id, 591 struct zinject_record *record); 592 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 593 struct zinject_record *record); 594 extern int zio_clear_fault(int id); 595 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 596 extern int zio_handle_fault_injection(zio_t *zio, int error); 597 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 598 extern int zio_handle_label_injection(zio_t *zio, int error); 599 extern void zio_handle_ignored_writes(zio_t *zio); 600 extern uint64_t zio_handle_io_delay(zio_t *zio); 601 602 /* 603 * Checksum ereport functions 604 */ 605 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 606 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 607 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 608 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 609 610 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 611 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 612 613 /* If we have the good data in hand, this function can be used */ 614 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 615 struct zio *zio, uint64_t offset, uint64_t length, 616 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 617 618 /* Called from spa_sync(), but primarily an injection handler */ 619 extern void spa_handle_ignored_writes(spa_t *spa); 620 621 /* zbookmark functions */ 622 boolean_t zbookmark_is_before(const struct dnode_phys *dnp, 623 const zbookmark_t *zb1, const zbookmark_t *zb2); 624 625 #ifdef __cplusplus 626 } 627 #endif 628 629 #endif /* _ZIO_H */ 630