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.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
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]
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, 2024 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 * Copyright (c) 2019, Allan Jude
30 * Copyright (c) 2019, 2023, 2024, Klara Inc.
31 * Copyright (c) 2019-2020, Michael Niewöhner
37 #include <sys/zio_priority.h>
38 #include <sys/zfs_context.h>
42 #include <sys/fs/zfs.h>
43 #include <sys/zio_impl.h>
52 #define ZEC_MAGIC 0x210da7ab10c7a11ULL
54 typedef struct zio_eck {
55 uint64_t zec_magic; /* for validation, endianness */
56 zio_cksum_t zec_cksum; /* 256-bit checksum */
60 * Gang block headers are self-checksumming and contain an array
63 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE
64 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \
65 sizeof (zio_eck_t)) / sizeof (blkptr_t))
66 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \
67 sizeof (zio_eck_t) - \
68 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
71 typedef struct zio_gbh {
72 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS];
73 uint64_t zg_filler[SPA_GBH_FILLER];
78 ZIO_CHECKSUM_INHERIT = 0,
82 ZIO_CHECKSUM_GANG_HEADER,
84 ZIO_CHECKSUM_FLETCHER_2,
85 ZIO_CHECKSUM_FLETCHER_4,
88 ZIO_CHECKSUM_NOPARITY,
93 ZIO_CHECKSUM_FUNCTIONS
97 * The number of "legacy" compression functions which can be set on individual
100 #define ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2
102 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_4
103 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
105 #define ZIO_CHECKSUM_MASK 0xffULL
106 #define ZIO_CHECKSUM_VERIFY (1U << 8)
108 #define ZIO_DEDUPCHECKSUM ZIO_CHECKSUM_SHA256
110 /* macros defining encryption lengths */
111 #define ZIO_OBJSET_MAC_LEN 32
112 #define ZIO_DATA_IV_LEN 12
113 #define ZIO_DATA_SALT_LEN 8
114 #define ZIO_DATA_MAC_LEN 16
117 * The number of "legacy" compression functions which can be set on individual
120 #define ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
123 * The meaning of "compress = on" selected by the compression features enabled
126 #define ZIO_COMPRESS_LEGACY_ON_VALUE ZIO_COMPRESS_LZJB
127 #define ZIO_COMPRESS_LZ4_ON_VALUE ZIO_COMPRESS_LZ4
129 #define ZIO_COMPRESS_DEFAULT ZIO_COMPRESS_ON
131 #define BOOTFS_COMPRESS_VALID(compress) \
132 ((compress) == ZIO_COMPRESS_LZJB || \
133 (compress) == ZIO_COMPRESS_LZ4 || \
134 (compress) == ZIO_COMPRESS_GZIP_1 || \
135 (compress) == ZIO_COMPRESS_GZIP_2 || \
136 (compress) == ZIO_COMPRESS_GZIP_3 || \
137 (compress) == ZIO_COMPRESS_GZIP_4 || \
138 (compress) == ZIO_COMPRESS_GZIP_5 || \
139 (compress) == ZIO_COMPRESS_GZIP_6 || \
140 (compress) == ZIO_COMPRESS_GZIP_7 || \
141 (compress) == ZIO_COMPRESS_GZIP_8 || \
142 (compress) == ZIO_COMPRESS_GZIP_9 || \
143 (compress) == ZIO_COMPRESS_ZLE || \
144 (compress) == ZIO_COMPRESS_ZSTD || \
145 (compress) == ZIO_COMPRESS_ON || \
146 (compress) == ZIO_COMPRESS_OFF)
149 #define ZIO_COMPRESS_ALGO(x) (x & SPA_COMPRESSMASK)
150 #define ZIO_COMPRESS_LEVEL(x) ((x & ~SPA_COMPRESSMASK) >> SPA_COMPRESSBITS)
151 #define ZIO_COMPRESS_RAW(type, level) (type | ((level) << SPA_COMPRESSBITS))
153 #define ZIO_COMPLEVEL_ZSTD(level) \
154 ZIO_COMPRESS_RAW(ZIO_COMPRESS_ZSTD, level)
156 #define ZIO_FAILURE_MODE_WAIT 0
157 #define ZIO_FAILURE_MODE_CONTINUE 1
158 #define ZIO_FAILURE_MODE_PANIC 2
160 typedef enum zio_suspend_reason {
161 ZIO_SUSPEND_NONE = 0,
164 } zio_suspend_reason_t;
167 * This was originally an enum type. However, those are 32-bit and there is no
168 * way to make a 64-bit enum type. Since we ran out of bits for flags, we were
169 * forced to upgrade it to a uint64_t.
171 typedef uint64_t zio_flag_t;
173 * Flags inherited by gang, ddt, and vdev children,
174 * and that must be equal for two zios to aggregate
176 #define ZIO_FLAG_DONT_AGGREGATE (1ULL << 0)
177 #define ZIO_FLAG_IO_REPAIR (1ULL << 1)
178 #define ZIO_FLAG_SELF_HEAL (1ULL << 2)
179 #define ZIO_FLAG_RESILVER (1ULL << 3)
180 #define ZIO_FLAG_SCRUB (1ULL << 4)
181 #define ZIO_FLAG_SCAN_THREAD (1ULL << 5)
182 #define ZIO_FLAG_PHYSICAL (1ULL << 6)
184 #define ZIO_FLAG_AGG_INHERIT (ZIO_FLAG_CANFAIL - 1)
187 * Flags inherited by ddt, gang, and vdev children.
189 #define ZIO_FLAG_CANFAIL (1ULL << 7) /* must be first for INHERIT */
190 #define ZIO_FLAG_SPECULATIVE (1ULL << 8)
191 #define ZIO_FLAG_CONFIG_WRITER (1ULL << 9)
192 #define ZIO_FLAG_DONT_RETRY (1ULL << 10)
193 #define ZIO_FLAG_NODATA (1ULL << 12)
194 #define ZIO_FLAG_INDUCE_DAMAGE (1ULL << 13)
195 #define ZIO_FLAG_IO_ALLOCATING (1ULL << 14)
197 #define ZIO_FLAG_DDT_INHERIT (ZIO_FLAG_IO_RETRY - 1)
198 #define ZIO_FLAG_GANG_INHERIT (ZIO_FLAG_IO_RETRY - 1)
201 * Flags inherited by vdev children.
203 #define ZIO_FLAG_IO_RETRY (1ULL << 15) /* must be first for INHERIT */
204 #define ZIO_FLAG_PROBE (1ULL << 16)
205 #define ZIO_FLAG_TRYHARD (1ULL << 17)
206 #define ZIO_FLAG_OPTIONAL (1ULL << 18)
208 #define ZIO_FLAG_VDEV_INHERIT (ZIO_FLAG_DONT_QUEUE - 1)
211 * Flags not inherited by any children.
213 #define ZIO_FLAG_DONT_QUEUE (1ULL << 19) /* must be first for INHERIT */
214 #define ZIO_FLAG_DONT_PROPAGATE (1ULL << 20)
215 #define ZIO_FLAG_IO_BYPASS (1ULL << 21)
216 #define ZIO_FLAG_IO_REWRITE (1ULL << 22)
217 #define ZIO_FLAG_RAW_COMPRESS (1ULL << 23)
218 #define ZIO_FLAG_RAW_ENCRYPT (1ULL << 24)
219 #define ZIO_FLAG_GANG_CHILD (1ULL << 25)
220 #define ZIO_FLAG_DDT_CHILD (1ULL << 26)
221 #define ZIO_FLAG_GODFATHER (1ULL << 27)
222 #define ZIO_FLAG_NOPWRITE (1ULL << 28)
223 #define ZIO_FLAG_REEXECUTED (1ULL << 29)
224 #define ZIO_FLAG_DELEGATED (1ULL << 30)
226 #define ZIO_ALLOCATOR_NONE (-1)
227 #define ZIO_HAS_ALLOCATOR(zio) ((zio)->io_allocator != ZIO_ALLOCATOR_NONE)
229 #define ZIO_FLAG_MUSTSUCCEED 0
230 #define ZIO_FLAG_RAW (ZIO_FLAG_RAW_COMPRESS | ZIO_FLAG_RAW_ENCRYPT)
232 #define ZIO_DDT_CHILD_FLAGS(zio) \
233 (((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) | \
234 ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
236 #define ZIO_GANG_CHILD_FLAGS(zio) \
237 (((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) | \
238 ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
240 #define ZIO_VDEV_CHILD_FLAGS(zio) \
241 (((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) | \
242 ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_CANFAIL)
244 #define ZIO_CHILD_BIT(x) (1U << (x))
245 #define ZIO_CHILD_BIT_IS_SET(val, x) ((val) & (1U << (x)))
255 #define ZIO_CHILD_VDEV_BIT ZIO_CHILD_BIT(ZIO_CHILD_VDEV)
256 #define ZIO_CHILD_GANG_BIT ZIO_CHILD_BIT(ZIO_CHILD_GANG)
257 #define ZIO_CHILD_DDT_BIT ZIO_CHILD_BIT(ZIO_CHILD_DDT)
258 #define ZIO_CHILD_LOGICAL_BIT ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL)
259 #define ZIO_CHILD_ALL_BITS \
260 (ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT | \
261 ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT)
269 typedef void zio_done_func_t(zio_t *zio);
271 extern int zio_exclude_metadata;
272 extern int zio_dva_throttle_enabled;
273 extern const char *const zio_type_name[ZIO_TYPES];
276 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
277 * identifies any block in the pool. By convention, the meta-objset (MOS)
278 * is objset 0, and the meta-dnode is object 0. This covers all blocks
279 * except root blocks and ZIL blocks, which are defined as follows:
281 * Root blocks (objset_phys_t) are object 0, level -1: <objset, 0, -1, 0>.
282 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
283 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
284 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>.
286 * Note: this structure is called a bookmark because its original purpose
287 * was to remember where to resume a pool-wide traverse.
289 * Note: this structure is passed between userland and the kernel, and is
290 * stored on disk (by virtue of being incorporated into other on-disk
291 * structures, e.g. dsl_scan_phys_t).
293 * If the head_errlog feature is enabled a different on-disk format for error
294 * logs is used. This introduces the use of an error bookmark, a four-tuple
295 * <object, level, blkid, birth> that uniquely identifies any error block
296 * in the pool. The birth transaction group is used to track whether the block
297 * has been overwritten by newer data or added to a snapshot since its marking
300 struct zbookmark_phys {
307 struct zbookmark_err_phys {
314 #define SET_BOOKMARK(zb, objset, object, level, blkid) \
316 (zb)->zb_objset = objset; \
317 (zb)->zb_object = object; \
318 (zb)->zb_level = level; \
319 (zb)->zb_blkid = blkid; \
322 #define ZB_DESTROYED_OBJSET (-1ULL)
324 #define ZB_ROOT_OBJECT (0ULL)
325 #define ZB_ROOT_LEVEL (-1LL)
326 #define ZB_ROOT_BLKID (0ULL)
328 #define ZB_ZIL_OBJECT (0ULL)
329 #define ZB_ZIL_LEVEL (-2LL)
331 #define ZB_DNODE_LEVEL (-3LL)
332 #define ZB_DNODE_BLKID (0ULL)
334 #define ZB_IS_ZERO(zb) \
335 ((zb)->zb_objset == 0 && (zb)->zb_object == 0 && \
336 (zb)->zb_level == 0 && (zb)->zb_blkid == 0)
337 #define ZB_IS_ROOT(zb) \
338 ((zb)->zb_object == ZB_ROOT_OBJECT && \
339 (zb)->zb_level == ZB_ROOT_LEVEL && \
340 (zb)->zb_blkid == ZB_ROOT_BLKID)
342 typedef struct zio_prop {
343 enum zio_checksum zp_checksum;
344 enum zio_compress zp_compress;
345 uint8_t zp_complevel;
348 dmu_object_type_t zp_type;
350 boolean_t zp_dedup_verify;
351 boolean_t zp_nopwrite;
352 boolean_t zp_brtwrite;
353 boolean_t zp_encrypt;
354 boolean_t zp_byteorder;
355 uint8_t zp_salt[ZIO_DATA_SALT_LEN];
356 uint8_t zp_iv[ZIO_DATA_IV_LEN];
357 uint8_t zp_mac[ZIO_DATA_MAC_LEN];
358 uint32_t zp_zpl_smallblk;
361 typedef struct zio_cksum_report zio_cksum_report_t;
363 typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
364 const abd_t *good_data);
365 typedef void zio_cksum_free_f(void *cbdata, size_t size);
367 struct zio_bad_cksum; /* defined in zio_checksum.h */
371 struct zio_cksum_report {
372 struct zio_cksum_report *zcr_next;
373 nvlist_t *zcr_ereport;
374 nvlist_t *zcr_detector;
376 size_t zcr_cbinfo; /* passed to zcr_free() */
380 zio_cksum_finish_f *zcr_finish;
381 zio_cksum_free_f *zcr_free;
383 /* internal use only */
384 struct zio_bad_cksum *zcr_ckinfo; /* information from failure */
387 typedef struct zio_vsd_ops {
388 zio_done_func_t *vsd_free;
391 typedef struct zio_gang_node {
392 zio_gbh_phys_t *gn_gbh;
393 struct zio_gang_node *gn_child[SPA_GBH_NBLKPTRS];
396 typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
397 zio_gang_node_t *gn, struct abd *data, uint64_t offset);
399 typedef void zio_transform_func_t(zio_t *zio, struct abd *data, uint64_t size);
401 typedef struct zio_transform {
402 struct abd *zt_orig_abd;
403 uint64_t zt_orig_size;
405 zio_transform_func_t *zt_transform;
406 struct zio_transform *zt_next;
409 typedef zio_t *zio_pipe_stage_t(zio_t *zio);
412 * The io_reexecute flags are distinct from io_flags because the child must
413 * be able to propagate them to the parent. The normal io_flags are local
414 * to the zio, not protected by any lock, and not modifiable by children;
415 * the reexecute flags are protected by io_lock, modifiable by children,
416 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
418 #define ZIO_REEXECUTE_NOW 0x01
419 #define ZIO_REEXECUTE_SUSPEND 0x02
422 * The io_trim flags are used to specify the type of TRIM to perform. They
423 * only apply to ZIO_TYPE_TRIM zios are distinct from io_flags.
426 ZIO_TRIM_SECURE = 1U << 0,
429 typedef struct zio_alloc_list {
434 typedef struct zio_link {
437 list_node_t zl_parent_node;
438 list_node_t zl_child_node;
448 /* Core information about this I/O */
449 zbookmark_phys_t io_bookmark;
452 enum zio_child io_child_type;
453 enum trim_flag io_trim_flags;
454 zio_priority_t io_priority;
455 uint8_t io_reexecute;
456 uint8_t io_state[ZIO_WAIT_TYPES];
460 blkptr_t *io_bp_override;
462 list_t io_parent_list;
463 list_t io_child_list;
465 zio_transform_t *io_transform_stack;
468 zio_done_func_t *io_ready;
469 zio_done_func_t *io_children_ready;
470 zio_done_func_t *io_done;
472 int64_t io_prev_space_delta; /* DMU private */
474 /* io_lsize != io_orig_size iff this is a raw write */
477 /* Data represented by this I/O */
479 struct abd *io_orig_abd;
481 uint64_t io_orig_size;
483 /* Stuff for the vdev stack */
486 const zio_vsd_ops_t *io_vsd_ops;
487 metaslab_class_t *io_metaslab_class; /* dva throttle class */
489 enum zio_qstate io_queue_state; /* vdev queue state */
493 } io_queue_node ____cacheline_aligned; /* allocator and vdev queues */
494 avl_node_t io_offset_node; /* vdev offset queues */
496 hrtime_t io_timestamp; /* submitted at */
497 hrtime_t io_queued_timestamp;
498 hrtime_t io_target_timestamp;
499 hrtime_t io_delta; /* vdev queue service delta */
500 hrtime_t io_delay; /* Device access time (disk or */
502 zio_alloc_list_t io_alloc_list;
504 /* Internal pipeline state */
506 enum zio_stage io_stage;
507 enum zio_stage io_pipeline;
508 zio_flag_t io_orig_flags;
509 enum zio_stage io_orig_stage;
510 enum zio_stage io_orig_pipeline;
511 enum zio_stage io_pipeline_trace;
513 int io_child_error[ZIO_CHILD_TYPES];
514 uint64_t io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
516 zio_t *io_gang_leader;
517 zio_gang_node_t *io_gang_tree;
526 zio_cksum_report_t *io_cksum_report;
529 /* Taskq dispatching state */
530 taskq_ent_t io_tqent;
533 enum blk_verify_flag {
539 enum blk_config_flag {
540 BLK_CONFIG_HELD, // SCL_VDEV held for writer
541 BLK_CONFIG_NEEDED, // SCL_VDEV should be obtained for reader
542 BLK_CONFIG_SKIP, // skip checks which require SCL_VDEV
545 extern int zio_bookmark_compare(const void *, const void *);
547 extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
548 zio_done_func_t *done, void *priv, zio_flag_t flags);
550 extern zio_t *zio_root(spa_t *spa,
551 zio_done_func_t *done, void *priv, zio_flag_t flags);
553 extern void zio_destroy(zio_t *zio);
555 extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
556 struct abd *data, uint64_t lsize, zio_done_func_t *done, void *priv,
557 zio_priority_t priority, zio_flag_t flags, const zbookmark_phys_t *zb);
559 extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
560 struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp,
561 zio_done_func_t *ready, zio_done_func_t *children_ready,
562 zio_done_func_t *done, void *priv, zio_priority_t priority,
563 zio_flag_t flags, const zbookmark_phys_t *zb);
565 extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
566 struct abd *data, uint64_t size, zio_done_func_t *done, void *priv,
567 zio_priority_t priority, zio_flag_t flags, zbookmark_phys_t *zb);
569 extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
570 boolean_t nopwrite, boolean_t brtwrite);
572 extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
574 extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
576 zio_done_func_t *done, void *priv, zio_flag_t flags);
578 extern zio_t *zio_trim(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size,
579 zio_done_func_t *done, void *priv, zio_priority_t priority,
580 zio_flag_t flags, enum trim_flag trim_flags);
582 extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
583 uint64_t size, struct abd *data, int checksum,
584 zio_done_func_t *done, void *priv, zio_priority_t priority,
585 zio_flag_t flags, boolean_t labels);
587 extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
588 uint64_t size, struct abd *data, int checksum,
589 zio_done_func_t *done, void *priv, zio_priority_t priority,
590 zio_flag_t flags, boolean_t labels);
592 extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
593 const blkptr_t *bp, zio_flag_t flags);
595 extern int zio_alloc_zil(spa_t *spa, objset_t *os, uint64_t txg,
596 blkptr_t *new_bp, uint64_t size, boolean_t *slog);
597 extern void zio_flush(zio_t *zio, vdev_t *vd);
598 extern void zio_shrink(zio_t *zio, uint64_t size);
600 extern int zio_wait(zio_t *zio);
601 extern void zio_nowait(zio_t *zio);
602 extern void zio_execute(void *zio);
603 extern void zio_interrupt(void *zio);
604 extern void zio_delay_init(zio_t *zio);
605 extern void zio_delay_interrupt(zio_t *zio);
606 extern void zio_deadman(zio_t *zio, const char *tag);
608 extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **);
609 extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **);
610 extern zio_t *zio_unique_parent(zio_t *cio);
611 extern void zio_add_child(zio_t *pio, zio_t *cio);
612 extern void zio_add_child_first(zio_t *pio, zio_t *cio);
614 extern void *zio_buf_alloc(size_t size);
615 extern void zio_buf_free(void *buf, size_t size);
616 extern void *zio_data_buf_alloc(size_t size);
617 extern void zio_data_buf_free(void *buf, size_t size);
619 extern void zio_push_transform(zio_t *zio, struct abd *abd, uint64_t size,
620 uint64_t bufsize, zio_transform_func_t *transform);
621 extern void zio_pop_transforms(zio_t *zio);
623 extern void zio_resubmit_stage_async(void *);
625 extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
626 uint64_t offset, struct abd *data, uint64_t size, int type,
627 zio_priority_t priority, zio_flag_t flags,
628 zio_done_func_t *done, void *priv);
630 extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
631 struct abd *data, uint64_t size, zio_type_t type, zio_priority_t priority,
632 zio_flag_t flags, zio_done_func_t *done, void *priv);
634 extern void zio_vdev_io_bypass(zio_t *zio);
635 extern void zio_vdev_io_reissue(zio_t *zio);
636 extern void zio_vdev_io_redone(zio_t *zio);
638 extern void zio_change_priority(zio_t *pio, zio_priority_t priority);
640 extern void zio_checksum_verified(zio_t *zio);
641 extern int zio_worst_error(int e1, int e2);
643 extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
644 enum zio_checksum parent);
645 extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
646 enum zio_checksum child, enum zio_checksum parent);
647 extern enum zio_compress zio_compress_select(spa_t *spa,
648 enum zio_compress child, enum zio_compress parent);
649 extern uint8_t zio_complevel_select(spa_t *spa, enum zio_compress compress,
650 uint8_t child, uint8_t parent);
652 extern void zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t);
653 extern int zio_resume(spa_t *spa);
654 extern void zio_resume_wait(spa_t *spa);
656 extern boolean_t zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp,
657 enum blk_config_flag blk_config, enum blk_verify_flag blk_verify);
660 * Initial setup and teardown.
662 extern void zio_init(void);
663 extern void zio_fini(void);
668 struct zinject_record;
669 extern uint32_t zio_injection_enabled;
670 extern int zio_inject_fault(char *name, int flags, int *id,
671 struct zinject_record *record);
672 extern int zio_inject_list_next(int *id, char *name, size_t buflen,
673 struct zinject_record *record);
674 extern int zio_clear_fault(int id);
675 extern void zio_handle_panic_injection(spa_t *spa, const char *tag,
677 extern int zio_handle_decrypt_injection(spa_t *spa, const zbookmark_phys_t *zb,
678 uint64_t type, int error);
679 extern int zio_handle_fault_injection(zio_t *zio, int error);
680 extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
681 extern int zio_handle_device_injections(vdev_t *vd, zio_t *zio, int err1,
683 extern int zio_handle_label_injection(zio_t *zio, int error);
684 extern void zio_handle_ignored_writes(zio_t *zio);
685 extern hrtime_t zio_handle_io_delay(zio_t *zio);
686 extern void zio_handle_import_delay(spa_t *spa, hrtime_t elapsed);
687 extern void zio_handle_export_delay(spa_t *spa, hrtime_t elapsed);
690 * Checksum ereport functions
692 extern int zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd,
693 const zbookmark_phys_t *zb, struct zio *zio, uint64_t offset,
694 uint64_t length, struct zio_bad_cksum *info);
695 extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
696 const abd_t *good_data, const abd_t *bad_data, boolean_t drop_if_identical);
698 extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
700 /* If we have the good data in hand, this function can be used */
701 extern int zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
702 const zbookmark_phys_t *zb, struct zio *zio, uint64_t offset,
703 uint64_t length, const abd_t *good_data, const abd_t *bad_data,
704 struct zio_bad_cksum *info);
706 void zio_vsd_default_cksum_report(zio_t *zio, zio_cksum_report_t *zcr);
707 extern void zfs_ereport_snapshot_post(const char *subclass, spa_t *spa,
710 /* Called from spa_sync(), but primarily an injection handler */
711 extern void spa_handle_ignored_writes(spa_t *spa);
713 /* zbookmark_phys functions */
714 boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp,
715 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
716 boolean_t zbookmark_subtree_tbd(const struct dnode_phys *dnp,
717 const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
718 int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2,
719 uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);