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_FUNCTIONS 86 }; 87 88 /* 89 * The number of "legacy" compression functions which can be set on individual 90 * objects. 91 */ 92 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2 93 94 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4 95 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 96 97 #define ZIO_CHECKSUM_MASK 0xffULL 98 #define ZIO_CHECKSUM_VERIFY (1 << 8) 99 100 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256 101 #define ZIO_DEDUPDITTO_MIN 100 102 103 enum zio_compress { 104 ZIO_COMPRESS_INHERIT = 0, 105 ZIO_COMPRESS_ON, 106 ZIO_COMPRESS_OFF, 107 ZIO_COMPRESS_LZJB, 108 ZIO_COMPRESS_EMPTY, 109 ZIO_COMPRESS_GZIP_1, 110 ZIO_COMPRESS_GZIP_2, 111 ZIO_COMPRESS_GZIP_3, 112 ZIO_COMPRESS_GZIP_4, 113 ZIO_COMPRESS_GZIP_5, 114 ZIO_COMPRESS_GZIP_6, 115 ZIO_COMPRESS_GZIP_7, 116 ZIO_COMPRESS_GZIP_8, 117 ZIO_COMPRESS_GZIP_9, 118 ZIO_COMPRESS_ZLE, 119 ZIO_COMPRESS_LZ4, 120 ZIO_COMPRESS_FUNCTIONS 121 }; 122 123 /* 124 * The number of "legacy" compression functions which can be set on individual 125 * objects. 126 */ 127 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4 128 129 /* 130 * The meaning of "compress = on" selected by the compression features enabled 131 * on a given pool. 132 */ 133 #define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB 134 #define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4 135 136 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_OFF 137 138 #define BOOTFS_COMPRESS_VALID(compress) \ 139 ((compress) == ZIO_COMPRESS_LZJB || \ 140 (compress) == ZIO_COMPRESS_LZ4 || \ 141 (compress) == ZIO_COMPRESS_ON || \ 142 (compress) == ZIO_COMPRESS_OFF) 143 144 #define ZIO_FAILURE_MODE_WAIT 0 145 #define ZIO_FAILURE_MODE_CONTINUE 1 146 #define ZIO_FAILURE_MODE_PANIC 2 147 148 enum zio_flag { 149 /* 150 * Flags inherited by gang, ddt, and vdev children, 151 * and that must be equal for two zios to aggregate 152 */ 153 ZIO_FLAG_DONT_AGGREGATE = 1 << 0, 154 ZIO_FLAG_IO_REPAIR = 1 << 1, 155 ZIO_FLAG_SELF_HEAL = 1 << 2, 156 ZIO_FLAG_RESILVER = 1 << 3, 157 ZIO_FLAG_SCRUB = 1 << 4, 158 ZIO_FLAG_SCAN_THREAD = 1 << 5, 159 ZIO_FLAG_PHYSICAL = 1 << 6, 160 161 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1) 162 163 /* 164 * Flags inherited by ddt, gang, and vdev children. 165 */ 166 ZIO_FLAG_CANFAIL = 1 << 7, /* must be first for INHERIT */ 167 ZIO_FLAG_SPECULATIVE = 1 << 8, 168 ZIO_FLAG_CONFIG_WRITER = 1 << 9, 169 ZIO_FLAG_DONT_RETRY = 1 << 10, 170 ZIO_FLAG_DONT_CACHE = 1 << 11, 171 ZIO_FLAG_NODATA = 1 << 12, 172 ZIO_FLAG_INDUCE_DAMAGE = 1 << 13, 173 174 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1) 175 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1) 176 177 /* 178 * Flags inherited by vdev children. 179 */ 180 ZIO_FLAG_IO_RETRY = 1 << 14, /* must be first for INHERIT */ 181 ZIO_FLAG_PROBE = 1 << 15, 182 ZIO_FLAG_TRYHARD = 1 << 16, 183 ZIO_FLAG_OPTIONAL = 1 << 17, 184 185 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1) 186 187 /* 188 * Flags not inherited by any children. 189 */ 190 ZIO_FLAG_DONT_QUEUE = 1 << 18, /* must be first for INHERIT */ 191 ZIO_FLAG_DONT_PROPAGATE = 1 << 19, 192 ZIO_FLAG_IO_BYPASS = 1 << 20, 193 ZIO_FLAG_IO_REWRITE = 1 << 21, 194 ZIO_FLAG_RAW = 1 << 22, 195 ZIO_FLAG_GANG_CHILD = 1 << 23, 196 ZIO_FLAG_DDT_CHILD = 1 << 24, 197 ZIO_FLAG_GODFATHER = 1 << 25, 198 ZIO_FLAG_NOPWRITE = 1 << 26, 199 ZIO_FLAG_REEXECUTED = 1 << 27, 200 ZIO_FLAG_DELEGATED = 1 << 28, 201 }; 202 203 #define ZIO_FLAG_MUSTSUCCEED 0 204 205 #define ZIO_DDT_CHILD_FLAGS(zio) \ 206 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \ 207 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL) 208 209 #define ZIO_GANG_CHILD_FLAGS(zio) \ 210 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \ 211 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL) 212 213 #define ZIO_VDEV_CHILD_FLAGS(zio) \ 214 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \ 215 ZIO_FLAG_CANFAIL) 216 217 #define ZIO_CHILD_BIT(x) (1 << (x)) 218 #define ZIO_CHILD_BIT_IS_SET(val, x) ((val) & (1 << (x))) 219 220 enum zio_child { 221 ZIO_CHILD_VDEV = 0, 222 ZIO_CHILD_GANG, 223 ZIO_CHILD_DDT, 224 ZIO_CHILD_LOGICAL, 225 ZIO_CHILD_TYPES 226 }; 227 228 #define ZIO_CHILD_VDEV_BIT ZIO_CHILD_BIT(ZIO_CHILD_VDEV) 229 #define ZIO_CHILD_GANG_BIT ZIO_CHILD_BIT(ZIO_CHILD_GANG) 230 #define ZIO_CHILD_DDT_BIT ZIO_CHILD_BIT(ZIO_CHILD_DDT) 231 #define ZIO_CHILD_LOGICAL_BIT ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL) 232 #define ZIO_CHILD_ALL_BITS \ 233 (ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT | \ 234 ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT) 235 236 enum zio_wait_type { 237 ZIO_WAIT_READY = 0, 238 ZIO_WAIT_DONE, 239 ZIO_WAIT_TYPES 240 }; 241 242 /* 243 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent 244 * graveyard) to indicate checksum errors and fragmentation. 245 */ 246 #define ECKSUM EBADE 247 #define EFRAGS EBADR 248 249 typedef void zio_done_func_t(zio_t *zio); 250 251 extern const char *zio_type_name[ZIO_TYPES]; 252 253 /* 254 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely 255 * identifies any block in the pool. By convention, the meta-objset (MOS) 256 * is objset 0, and the meta-dnode is object 0. This covers all blocks 257 * except root blocks and ZIL blocks, which are defined as follows: 258 * 259 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>. 260 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>. 261 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>. 262 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>. 263 * 264 * Note: this structure is called a bookmark because its original purpose 265 * was to remember where to resume a pool-wide traverse. 266 * 267 * Note: this structure is passed between userland and the kernel, and is 268 * stored on disk (by virtue of being incorporated into other on-disk 269 * structures, e.g. dsl_scan_phys_t). 270 */ 271 typedef struct zbookmark_phys { 272 uint64_t zb_objset; 273 uint64_t zb_object; 274 int64_t zb_level; 275 uint64_t zb_blkid; 276 } zbookmark_phys_t; 277 278 #define SET_BOOKMARK(zb, objset, object, level, blkid) \ 279 { \ 280 (zb)->zb_objset = objset; \ 281 (zb)->zb_object = object; \ 282 (zb)->zb_level = level; \ 283 (zb)->zb_blkid = blkid; \ 284 } 285 286 #define ZB_DESTROYED_OBJSET (-1ULL) 287 288 #define ZB_ROOT_OBJECT (0ULL) 289 #define ZB_ROOT_LEVEL (-1LL) 290 #define ZB_ROOT_BLKID (0ULL) 291 292 #define ZB_ZIL_OBJECT (0ULL) 293 #define ZB_ZIL_LEVEL (-2LL) 294 295 #define ZB_DNODE_LEVEL (-3LL) 296 #define ZB_DNODE_BLKID (0ULL) 297 298 #define ZB_IS_ZERO(zb) \ 299 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \ 300 (zb)->zb_level == 0 && (zb)->zb_blkid == 0) 301 #define ZB_IS_ROOT(zb) \ 302 ((zb)->zb_object == ZB_ROOT_OBJECT && \ 303 (zb)->zb_level == ZB_ROOT_LEVEL && \ 304 (zb)->zb_blkid == ZB_ROOT_BLKID) 305 306 typedef struct zio_prop { 307 enum zio_checksum zp_checksum; 308 enum zio_compress zp_compress; 309 dmu_object_type_t zp_type; 310 uint8_t zp_level; 311 uint8_t zp_copies; 312 boolean_t zp_dedup; 313 boolean_t zp_dedup_verify; 314 boolean_t zp_nopwrite; 315 } zio_prop_t; 316 317 typedef struct zio_cksum_report zio_cksum_report_t; 318 319 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep, 320 const void *good_data); 321 typedef void zio_cksum_free_f(void *cbdata, size_t size); 322 323 struct zio_bad_cksum; /* defined in zio_checksum.h */ 324 struct dnode_phys; 325 326 struct zio_cksum_report { 327 struct zio_cksum_report *zcr_next; 328 nvlist_t *zcr_ereport; 329 nvlist_t *zcr_detector; 330 void *zcr_cbdata; 331 size_t zcr_cbinfo; /* passed to zcr_free() */ 332 uint64_t zcr_align; 333 uint64_t zcr_length; 334 zio_cksum_finish_f *zcr_finish; 335 zio_cksum_free_f *zcr_free; 336 337 /* internal use only */ 338 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */ 339 }; 340 341 typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr, 342 void *arg); 343 344 zio_vsd_cksum_report_f zio_vsd_default_cksum_report; 345 346 typedef struct zio_vsd_ops { 347 zio_done_func_t *vsd_free; 348 zio_vsd_cksum_report_f *vsd_cksum_report; 349 } zio_vsd_ops_t; 350 351 typedef struct zio_gang_node { 352 zio_gbh_phys_t *gn_gbh; 353 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS]; 354 } zio_gang_node_t; 355 356 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp, 357 zio_gang_node_t *gn, void *data); 358 359 typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size); 360 361 typedef struct zio_transform { 362 void *zt_orig_data; 363 uint64_t zt_orig_size; 364 uint64_t zt_bufsize; 365 zio_transform_func_t *zt_transform; 366 struct zio_transform *zt_next; 367 } zio_transform_t; 368 369 typedef int zio_pipe_stage_t(zio_t *zio); 370 371 /* 372 * The io_reexecute flags are distinct from io_flags because the child must 373 * be able to propagate them to the parent. The normal io_flags are local 374 * to the zio, not protected by any lock, and not modifiable by children; 375 * the reexecute flags are protected by io_lock, modifiable by children, 376 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set. 377 */ 378 #define ZIO_REEXECUTE_NOW 0x01 379 #define ZIO_REEXECUTE_SUSPEND 0x02 380 381 typedef struct zio_link { 382 zio_t *zl_parent; 383 zio_t *zl_child; 384 list_node_t zl_parent_node; 385 list_node_t zl_child_node; 386 } zio_link_t; 387 388 struct zio { 389 /* Core information about this I/O */ 390 zbookmark_phys_t io_bookmark; 391 zio_prop_t io_prop; 392 zio_type_t io_type; 393 enum zio_child io_child_type; 394 int io_cmd; 395 zio_priority_t io_priority; 396 uint8_t io_reexecute; 397 uint8_t io_state[ZIO_WAIT_TYPES]; 398 uint64_t io_txg; 399 spa_t *io_spa; 400 blkptr_t *io_bp; 401 blkptr_t *io_bp_override; 402 blkptr_t io_bp_copy; 403 list_t io_parent_list; 404 list_t io_child_list; 405 zio_link_t *io_walk_link; 406 zio_t *io_logical; 407 zio_transform_t *io_transform_stack; 408 409 /* Callback info */ 410 zio_done_func_t *io_ready; 411 zio_done_func_t *io_physdone; 412 zio_done_func_t *io_done; 413 void *io_private; 414 int64_t io_prev_space_delta; /* DMU private */ 415 blkptr_t io_bp_orig; 416 417 /* Data represented by this I/O */ 418 void *io_data; 419 void *io_orig_data; 420 uint64_t io_size; 421 uint64_t io_orig_size; 422 423 /* Stuff for the vdev stack */ 424 vdev_t *io_vd; 425 void *io_vsd; 426 const zio_vsd_ops_t *io_vsd_ops; 427 428 uint64_t io_offset; 429 hrtime_t io_timestamp; 430 avl_node_t io_queue_node; 431 avl_node_t io_offset_node; 432 433 /* Internal pipeline state */ 434 enum zio_flag io_flags; 435 enum zio_stage io_stage; 436 enum zio_stage io_pipeline; 437 enum zio_flag io_orig_flags; 438 enum zio_stage io_orig_stage; 439 enum zio_stage io_orig_pipeline; 440 int io_error; 441 int io_child_error[ZIO_CHILD_TYPES]; 442 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES]; 443 uint64_t io_child_count; 444 uint64_t io_phys_children; 445 uint64_t io_parent_count; 446 uint64_t *io_stall; 447 zio_t *io_gang_leader; 448 zio_gang_node_t *io_gang_tree; 449 void *io_executor; 450 void *io_waiter; 451 kmutex_t io_lock; 452 kcondvar_t io_cv; 453 454 /* FMA state */ 455 zio_cksum_report_t *io_cksum_report; 456 uint64_t io_ena; 457 458 /* Taskq dispatching state */ 459 taskq_ent_t io_tqent; 460 }; 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 *physdone, zio_done_func_t *done, 475 void *private, 476 zio_priority_t priority, enum zio_flag flags, 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 void *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, void *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, void *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 use_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); 517 518 extern zio_t *zio_walk_parents(zio_t *cio); 519 extern zio_t *zio_walk_children(zio_t *pio); 520 extern zio_t *zio_unique_parent(zio_t *cio); 521 extern void zio_add_child(zio_t *pio, zio_t *cio); 522 523 extern void *zio_buf_alloc(size_t size); 524 extern void zio_buf_free(void *buf, size_t size); 525 extern void *zio_data_buf_alloc(size_t size); 526 extern void zio_data_buf_free(void *buf, size_t size); 527 528 extern void zio_resubmit_stage_async(void *); 529 530 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd, 531 uint64_t offset, void *data, uint64_t size, int type, 532 zio_priority_t priority, enum zio_flag flags, 533 zio_done_func_t *done, void *private); 534 535 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset, 536 void *data, uint64_t size, int type, zio_priority_t priority, 537 enum zio_flag flags, zio_done_func_t *done, void *private); 538 539 extern void zio_vdev_io_bypass(zio_t *zio); 540 extern void zio_vdev_io_reissue(zio_t *zio); 541 extern void zio_vdev_io_redone(zio_t *zio); 542 543 extern void zio_checksum_verified(zio_t *zio); 544 extern int zio_worst_error(int e1, int e2); 545 546 extern enum zio_checksum zio_checksum_select(enum zio_checksum child, 547 enum zio_checksum parent); 548 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa, 549 enum zio_checksum child, enum zio_checksum parent); 550 extern enum zio_compress zio_compress_select(spa_t *spa, 551 enum zio_compress child, enum zio_compress parent); 552 553 extern void zio_suspend(spa_t *spa, zio_t *zio); 554 extern int zio_resume(spa_t *spa); 555 extern void zio_resume_wait(spa_t *spa); 556 557 /* 558 * Initial setup and teardown. 559 */ 560 extern void zio_init(void); 561 extern void zio_fini(void); 562 563 /* 564 * Fault injection 565 */ 566 struct zinject_record; 567 extern uint32_t zio_injection_enabled; 568 extern int zio_inject_fault(char *name, int flags, int *id, 569 struct zinject_record *record); 570 extern int zio_inject_list_next(int *id, char *name, size_t buflen, 571 struct zinject_record *record); 572 extern int zio_clear_fault(int id); 573 extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type); 574 extern int zio_handle_fault_injection(zio_t *zio, int error); 575 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error); 576 extern int zio_handle_label_injection(zio_t *zio, int error); 577 extern void zio_handle_ignored_writes(zio_t *zio); 578 extern uint64_t zio_handle_io_delay(zio_t *zio); 579 580 /* 581 * Checksum ereport functions 582 */ 583 extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio, 584 uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info); 585 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report, 586 const void *good_data, const void *bad_data, boolean_t drop_if_identical); 587 588 extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report); 589 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report); 590 591 /* If we have the good data in hand, this function can be used */ 592 extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd, 593 struct zio *zio, uint64_t offset, uint64_t length, 594 const void *good_data, const void *bad_data, struct zio_bad_cksum *info); 595 596 /* Called from spa_sync(), but primarily an injection handler */ 597 extern void spa_handle_ignored_writes(spa_t *spa); 598 599 /* zbookmark_phys functions */ 600 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp, 601 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block); 602 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2, 603 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2); 604 605 #ifdef __cplusplus 606 } 607 #endif 608 609 #endif /* _ZIO_H */ 610