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 * 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 enum zio_compress { 108 ZIO_COMPRESS_INHERIT = 0, 109 ZIO_COMPRESS_ON, 110 ZIO_COMPRESS_OFF, 111 ZIO_COMPRESS_LZJB, 112 ZIO_COMPRESS_EMPTY, 113 ZIO_COMPRESS_GZIP_1, 114 ZIO_COMPRESS_GZIP_2, 115 ZIO_COMPRESS_GZIP_3, 116 ZIO_COMPRESS_GZIP_4, 117 ZIO_COMPRESS_GZIP_5, 118 ZIO_COMPRESS_GZIP_6, 119 ZIO_COMPRESS_GZIP_7, 120 ZIO_COMPRESS_GZIP_8, 121 ZIO_COMPRESS_GZIP_9, 122 ZIO_COMPRESS_ZLE, 123 ZIO_COMPRESS_LZ4, 124 ZIO_COMPRESS_FUNCTIONS 125 }; 126 127 /* 128 * The number of "legacy" compression functions which can be set on individual 129 * objects. 130 */ 131 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4 132 133 /* 134 * The meaning of "compress = on" selected by the compression features enabled 135 * on a given pool. 136 */ 137 #define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB 138 #define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4 139 140 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 141 142 #define BOOTFS_COMPRESS_VALID(compress) \ 143 ((compress) == ZIO_COMPRESS_LZJB || \ 144 (compress) == ZIO_COMPRESS_LZ4 || \ 145 (compress) == ZIO_COMPRESS_GZIP_1 || \ 146 (compress) == ZIO_COMPRESS_GZIP_2 || \ 147 (compress) == ZIO_COMPRESS_GZIP_3 || \ 148 (compress) == ZIO_COMPRESS_GZIP_4 || \ 149 (compress) == ZIO_COMPRESS_GZIP_5 || \ 150 (compress) == ZIO_COMPRESS_GZIP_6 || \ 151 (compress) == ZIO_COMPRESS_GZIP_7 || \ 152 (compress) == ZIO_COMPRESS_GZIP_8 || \ 153 (compress) == ZIO_COMPRESS_GZIP_9 || \ 154 (compress) == ZIO_COMPRESS_ON || \ 155 (compress) == ZIO_COMPRESS_OFF) 156 157 #define ZIO_FAILURE_MODE_WAIT 0 158 #define ZIO_FAILURE_MODE_CONTINUE 1 159 #define ZIO_FAILURE_MODE_PANIC 2 160 161 enum zio_flag { 162 /* 163 * Flags inherited by gang, ddt, and vdev children, 164 * and that must be equal for two zios to aggregate 165 */ 166 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 167 ZIO_FLAG_IO_REPAIR = 1 << 1, 168 ZIO_FLAG_SELF_HEAL = 1 << 2, 169 ZIO_FLAG_RESILVER = 1 << 3, 170 ZIO_FLAG_SCRUB = 1 << 4, 171 ZIO_FLAG_SCAN_THREAD = 1 << 5, 172 ZIO_FLAG_PHYSICAL = 1 << 6, 173 174 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 175 176 /* 177 * Flags inherited by ddt, gang, and vdev children. 178 */ 179 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 180 ZIO_FLAG_SPECULATIVE = 1 << 8, 181 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 182 ZIO_FLAG_DONT_RETRY = 1 << 10, 183 ZIO_FLAG_DONT_CACHE = 1 << 11, 184 ZIO_FLAG_NODATA = 1 << 12, 185 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 186 187 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 188 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 189 190 /* 191 * Flags inherited by vdev children. 192 */ 193 ZIO_FLAG_IO_RETRY = 1 << 14, /* must be first for INHERIT */ 194 ZIO_FLAG_PROBE = 1 << 15, 195 ZIO_FLAG_TRYHARD = 1 << 16, 196 ZIO_FLAG_OPTIONAL = 1 << 17, 197 198 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 199 200 /* 201 * Flags not inherited by any children. 202 */ 203 ZIO_FLAG_DONT_QUEUE = 1 << 18, /* must be first for INHERIT */ 204 ZIO_FLAG_DONT_PROPAGATE = 1 << 19, 205 ZIO_FLAG_IO_BYPASS = 1 << 20, 206 ZIO_FLAG_IO_REWRITE = 1 << 21, 207 ZIO_FLAG_RAW = 1 << 22, 208 ZIO_FLAG_GANG_CHILD = 1 << 23, 209 ZIO_FLAG_DDT_CHILD = 1 << 24, 210 ZIO_FLAG_GODFATHER = 1 << 25, 211 ZIO_FLAG_NOPWRITE = 1 << 26, 212 ZIO_FLAG_REEXECUTED = 1 << 27, 213 ZIO_FLAG_DELEGATED = 1 << 28, 214 }; 215 216 #define ZIO_FLAG_MUSTSUCCEED 0 217 218 #define ZIO_DDT_CHILD_FLAGS(zio) \ 219 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 220 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 221 222 #define ZIO_GANG_CHILD_FLAGS(zio) \ 223 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 224 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 225 226 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 227 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 228 ZIO_FLAG_CANFAIL) 229 230 #define ZIO_CHILD_BIT(x) (1 << (x)) 231 #define ZIO_CHILD_BIT_IS_SET(val, x) ((val) & (1 << (x))) 232 233 enum zio_child { 234 ZIO_CHILD_VDEV = 0, 235 ZIO_CHILD_GANG, 236 ZIO_CHILD_DDT, 237 ZIO_CHILD_LOGICAL, 238 ZIO_CHILD_TYPES 239 }; 240 241 #define ZIO_CHILD_VDEV_BIT ZIO_CHILD_BIT(ZIO_CHILD_VDEV) 242 #define ZIO_CHILD_GANG_BIT ZIO_CHILD_BIT(ZIO_CHILD_GANG) 243 #define ZIO_CHILD_DDT_BIT ZIO_CHILD_BIT(ZIO_CHILD_DDT) 244 #define ZIO_CHILD_LOGICAL_BIT ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL) 245 #define ZIO_CHILD_ALL_BITS \ 246 (ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT | \ 247 ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT) 248 249 enum zio_wait_type { 250 ZIO_WAIT_READY = 0, 251 ZIO_WAIT_DONE, 252 ZIO_WAIT_TYPES 253 }; 254 255 /* 256 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 257 * graveyard) to indicate checksum errors and fragmentation. 258 */ 259 #define ECKSUM EBADE 260 #define EFRAGS EBADR 261 262 typedef void zio_done_func_t(zio_t *zio); 263 264 extern const char *zio_type_name[ZIO_TYPES]; 265 266 /* 267 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 268 * identifies any block in the pool. By convention, the meta-objset (MOS) 269 * is objset 0, and the meta-dnode is object 0. This covers all blocks 270 * except root blocks and ZIL blocks, which are defined as follows: 271 * 272 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 273 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 274 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 275 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>. 276 * 277 * Note: this structure is called a bookmark because its original purpose 278 * was to remember where to resume a pool-wide traverse. 279 * 280 * Note: this structure is passed between userland and the kernel, and is 281 * stored on disk (by virtue of being incorporated into other on-disk 282 * structures, e.g. dsl_scan_phys_t). 283 */ 284 typedef struct zbookmark_phys { 285 uint64_t zb_objset; 286 uint64_t zb_object; 287 int64_t zb_level; 288 uint64_t zb_blkid; 289 } zbookmark_phys_t; 290 291 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 292 { \ 293 (zb)->zb_objset = objset; \ 294 (zb)->zb_object = object; \ 295 (zb)->zb_level = level; \ 296 (zb)->zb_blkid = blkid; \ 297 } 298 299 #define ZB_DESTROYED_OBJSET (-1ULL) 300 301 #define ZB_ROOT_OBJECT (0ULL) 302 #define ZB_ROOT_LEVEL (-1LL) 303 #define ZB_ROOT_BLKID (0ULL) 304 305 #define ZB_ZIL_OBJECT (0ULL) 306 #define ZB_ZIL_LEVEL (-2LL) 307 308 #define ZB_DNODE_LEVEL (-3LL) 309 #define ZB_DNODE_BLKID (0ULL) 310 311 #define ZB_IS_ZERO(zb) \ 312 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 313 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 314 #define ZB_IS_ROOT(zb) \ 315 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 316 (zb)->zb_level == ZB_ROOT_LEVEL && \ 317 (zb)->zb_blkid == ZB_ROOT_BLKID) 318 319 typedef struct zio_prop { 320 enum zio_checksum zp_checksum; 321 enum zio_compress zp_compress; 322 dmu_object_type_t zp_type; 323 uint8_t zp_level; 324 uint8_t zp_copies; 325 boolean_t zp_dedup; 326 boolean_t zp_dedup_verify; 327 boolean_t zp_nopwrite; 328 } zio_prop_t; 329 330 typedef struct zio_cksum_report zio_cksum_report_t; 331 332 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 333 const void *good_data); 334 typedef void zio_cksum_free_f(void *cbdata, size_t size); 335 336 struct zio_bad_cksum; /* defined in zio_checksum.h */ 337 struct dnode_phys; 338 339 struct zio_cksum_report { 340 struct zio_cksum_report *zcr_next; 341 nvlist_t *zcr_ereport; 342 nvlist_t *zcr_detector; 343 void *zcr_cbdata; 344 size_t zcr_cbinfo; /* passed to zcr_free() */ 345 uint64_t zcr_align; 346 uint64_t zcr_length; 347 zio_cksum_finish_f *zcr_finish; 348 zio_cksum_free_f *zcr_free; 349 350 /* internal use only */ 351 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 352 }; 353 354 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 355 void *arg); 356 357 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 358 359 typedef struct zio_vsd_ops { 360 zio_done_func_t *vsd_free; 361 zio_vsd_cksum_report_f *vsd_cksum_report; 362 } zio_vsd_ops_t; 363 364 typedef struct zio_gang_node { 365 zio_gbh_phys_t *gn_gbh; 366 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 367 } zio_gang_node_t; 368 369 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 370 zio_gang_node_t *gn, void *data); 371 372 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 373 374 typedef struct zio_transform { 375 void *zt_orig_data; 376 uint64_t zt_orig_size; 377 uint64_t zt_bufsize; 378 zio_transform_func_t *zt_transform; 379 struct zio_transform *zt_next; 380 } zio_transform_t; 381 382 typedef int zio_pipe_stage_t(zio_t *zio); 383 384 /* 385 * The io_reexecute flags are distinct from io_flags because the child must 386 * be able to propagate them to the parent. The normal io_flags are local 387 * to the zio, not protected by any lock, and not modifiable by children; 388 * the reexecute flags are protected by io_lock, modifiable by children, 389 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 390 */ 391 #define ZIO_REEXECUTE_NOW 0x01 392 #define ZIO_REEXECUTE_SUSPEND 0x02 393 394 typedef struct zio_link { 395 zio_t *zl_parent; 396 zio_t *zl_child; 397 list_node_t zl_parent_node; 398 list_node_t zl_child_node; 399 } zio_link_t; 400 401 struct zio { 402 /* Core information about this I/O */ 403 zbookmark_phys_t io_bookmark; 404 zio_prop_t io_prop; 405 zio_type_t io_type; 406 enum zio_child io_child_type; 407 int io_cmd; 408 zio_priority_t io_priority; 409 uint8_t io_reexecute; 410 uint8_t io_state[ZIO_WAIT_TYPES]; 411 uint64_t io_txg; 412 spa_t *io_spa; 413 blkptr_t *io_bp; 414 blkptr_t *io_bp_override; 415 blkptr_t io_bp_copy; 416 list_t io_parent_list; 417 list_t io_child_list; 418 zio_link_t *io_walk_link; 419 zio_t *io_logical; 420 zio_transform_t *io_transform_stack; 421 422 /* Callback info */ 423 zio_done_func_t *io_ready; 424 zio_done_func_t *io_physdone; 425 zio_done_func_t *io_done; 426 void *io_private; 427 int64_t io_prev_space_delta; /* DMU private */ 428 blkptr_t io_bp_orig; 429 430 /* Data represented by this I/O */ 431 void *io_data; 432 void *io_orig_data; 433 uint64_t io_size; 434 uint64_t io_orig_size; 435 436 /* Stuff for the vdev stack */ 437 vdev_t *io_vd; 438 void *io_vsd; 439 const zio_vsd_ops_t *io_vsd_ops; 440 441 uint64_t io_offset; 442 hrtime_t io_timestamp; 443 hrtime_t io_target_timestamp; 444 avl_node_t io_queue_node; 445 avl_node_t io_offset_node; 446 447 /* Internal pipeline state */ 448 enum zio_flag io_flags; 449 enum zio_stage io_stage; 450 enum zio_stage io_pipeline; 451 enum zio_flag io_orig_flags; 452 enum zio_stage io_orig_stage; 453 enum zio_stage io_orig_pipeline; 454 int io_error; 455 int io_child_error[ZIO_CHILD_TYPES]; 456 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 457 uint64_t io_child_count; 458 uint64_t io_phys_children; 459 uint64_t io_parent_count; 460 uint64_t *io_stall; 461 zio_t *io_gang_leader; 462 zio_gang_node_t *io_gang_tree; 463 void *io_executor; 464 void *io_waiter; 465 kmutex_t io_lock; 466 kcondvar_t io_cv; 467 468 /* FMA state */ 469 zio_cksum_report_t *io_cksum_report; 470 uint64_t io_ena; 471 472 /* Taskq dispatching state */ 473 taskq_ent_t io_tqent; 474 }; 475 476 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd, 477 zio_done_func_t *done, void *private, enum zio_flag flags); 478 479 extern zio_t *zio_root(spa_t *spa, 480 zio_done_func_t *done, void *private, enum zio_flag flags); 481 482 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data, 483 uint64_t size, zio_done_func_t *done, void *private, 484 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 485 486 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 487 void *data, uint64_t size, const zio_prop_t *zp, 488 zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done, 489 void *private, 490 zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb); 491 492 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp, 493 void *data, uint64_t size, zio_done_func_t *done, void *private, 494 zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb); 495 496 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies, 497 boolean_t nopwrite); 498 499 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp); 500 501 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg, 502 const blkptr_t *bp, 503 zio_done_func_t *done, void *private, enum zio_flag flags); 504 505 extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd, 506 zio_done_func_t *done, void *private, enum zio_flag flags); 507 508 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 509 uint64_t size, void *data, int checksum, 510 zio_done_func_t *done, void *private, zio_priority_t priority, 511 enum zio_flag flags, boolean_t labels); 512 513 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset, 514 uint64_t size, void *data, int checksum, 515 zio_done_func_t *done, void *private, zio_priority_t priority, 516 enum zio_flag flags, boolean_t labels); 517 518 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg, 519 const blkptr_t *bp, enum zio_flag flags); 520 521 extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp, 522 blkptr_t *old_bp, uint64_t size, boolean_t use_slog); 523 extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp); 524 extern void zio_flush(zio_t *zio, vdev_t *vd); 525 extern void zio_shrink(zio_t *zio, uint64_t size); 526 527 extern int zio_wait(zio_t *zio); 528 extern void zio_nowait(zio_t *zio); 529 extern void zio_execute(zio_t *zio); 530 extern void zio_interrupt(zio_t *zio); 531 extern void zio_delay_init(zio_t *zio); 532 extern void zio_delay_interrupt(zio_t *zio); 533 534 extern zio_t *zio_walk_parents(zio_t *cio); 535 extern zio_t *zio_walk_children(zio_t *pio); 536 extern zio_t *zio_unique_parent(zio_t *cio); 537 extern void zio_add_child(zio_t *pio, zio_t *cio); 538 539 extern void *zio_buf_alloc(size_t size); 540 extern void zio_buf_free(void *buf, size_t size); 541 extern void *zio_data_buf_alloc(size_t size); 542 extern void zio_data_buf_free(void *buf, size_t size); 543 544 extern void zio_resubmit_stage_async(void *); 545 546 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 547 uint64_t offset, void *data, uint64_t size, int type, 548 zio_priority_t priority, enum zio_flag flags, 549 zio_done_func_t *done, void *private); 550 551 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 552 void *data, uint64_t size, int type, zio_priority_t priority, 553 enum zio_flag flags, zio_done_func_t *done, void *private); 554 555 extern void zio_vdev_io_bypass(zio_t *zio); 556 extern void zio_vdev_io_reissue(zio_t *zio); 557 extern void zio_vdev_io_redone(zio_t *zio); 558 559 extern void zio_checksum_verified(zio_t *zio); 560 extern int zio_worst_error(int e1, int e2); 561 562 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 563 enum zio_checksum parent); 564 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 565 enum zio_checksum child, enum zio_checksum parent); 566 extern enum zio_compress zio_compress_select(spa_t *spa, 567 enum zio_compress child, enum zio_compress parent); 568 569 extern void zio_suspend(spa_t *spa, zio_t *zio); 570 extern int zio_resume(spa_t *spa); 571 extern void zio_resume_wait(spa_t *spa); 572 573 /* 574 * Initial setup and teardown. 575 */ 576 extern void zio_init(void); 577 extern void zio_fini(void); 578 579 /* 580 * Fault injection 581 */ 582 struct zinject_record; 583 extern uint32_t zio_injection_enabled; 584 extern int zio_inject_fault(char *name, int flags, int *id, 585 struct zinject_record *record); 586 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 587 struct zinject_record *record); 588 extern int zio_clear_fault(int id); 589 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 590 extern int zio_handle_fault_injection(zio_t *zio, int error); 591 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 592 extern int zio_handle_label_injection(zio_t *zio, int error); 593 extern void zio_handle_ignored_writes(zio_t *zio); 594 extern hrtime_t zio_handle_io_delay(zio_t *zio); 595 596 /* 597 * Checksum ereport functions 598 */ 599 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 600 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 601 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 602 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 603 604 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 605 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 606 607 /* If we have the good data in hand, this function can be used */ 608 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 609 struct zio *zio, uint64_t offset, uint64_t length, 610 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 611 612 /* Called from spa_sync(), but primarily an injection handler */ 613 extern void spa_handle_ignored_writes(spa_t *spa); 614 615 /* zbookmark_phys functions */ 616 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp, 617 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block); 618 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, 619 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 620 621 #ifdef __cplusplus 622 } 623 #endif 624 625 #endif /* _ZIO_H */ 626