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, 2018 by Delphix. All rights reserved.
26 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
27 * Copyright 2016 Toomas Soome <tsoome@me.com>
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/kstat.h>
39#include <sys/fs/zfs.h>
40#include <sys/zio_impl.h>
41
42#ifdef	__cplusplus
43extern "C" {
44#endif
45
46/*
47 * Embedded checksum
48 */
49#define	ZEC_MAGIC	0x210da7ab10c7a11ULL
50
51typedef 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
68typedef 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
74enum 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#ifdef illumos
89	ZIO_CHECKSUM_EDONR,
90#endif
91	ZIO_CHECKSUM_FUNCTIONS
92};
93
94/*
95 * The number of "legacy" compression functions which can be set on individual
96 * objects.
97 */
98#define	ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2
99
100#define	ZIO_CHECKSUM_ON_VALUE	ZIO_CHECKSUM_FLETCHER_4
101#define	ZIO_CHECKSUM_DEFAULT	ZIO_CHECKSUM_ON
102
103#define	ZIO_CHECKSUM_MASK	0xffULL
104#define	ZIO_CHECKSUM_VERIFY	(1 << 8)
105
106#define	ZIO_DEDUPCHECKSUM	ZIO_CHECKSUM_SHA256
107#define	ZIO_DEDUPDITTO_MIN	100
108
109/*
110 * The number of "legacy" compression functions which can be set on individual
111 * objects.
112 */
113#define	ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
114
115/*
116 * The meaning of "compress = on" selected by the compression features enabled
117 * on a given pool.
118 */
119#define	ZIO_COMPRESS_LEGACY_ON_VALUE	ZIO_COMPRESS_LZJB
120#define	ZIO_COMPRESS_LZ4_ON_VALUE	ZIO_COMPRESS_LZ4
121
122#define	ZIO_COMPRESS_DEFAULT		ZIO_COMPRESS_OFF
123
124#define	BOOTFS_COMPRESS_VALID(compress)			\
125	((compress) == ZIO_COMPRESS_LZJB ||		\
126	(compress) == ZIO_COMPRESS_LZ4 ||		\
127	(compress) == ZIO_COMPRESS_ON ||		\
128	(compress) == ZIO_COMPRESS_OFF)
129
130#define	ZIO_FAILURE_MODE_WAIT		0
131#define	ZIO_FAILURE_MODE_CONTINUE	1
132#define	ZIO_FAILURE_MODE_PANIC		2
133
134typedef enum zio_suspend_reason {
135	ZIO_SUSPEND_NONE = 0,
136	ZIO_SUSPEND_IOERR,
137	ZIO_SUSPEND_MMP,
138} zio_suspend_reason_t;
139
140enum zio_flag {
141	/*
142	 * Flags inherited by gang, ddt, and vdev children,
143	 * and that must be equal for two zios to aggregate
144	 */
145	ZIO_FLAG_DONT_AGGREGATE	= 1 << 0,
146	ZIO_FLAG_IO_REPAIR	= 1 << 1,
147	ZIO_FLAG_SELF_HEAL	= 1 << 2,
148	ZIO_FLAG_RESILVER	= 1 << 3,
149	ZIO_FLAG_SCRUB		= 1 << 4,
150	ZIO_FLAG_SCAN_THREAD	= 1 << 5,
151	ZIO_FLAG_PHYSICAL	= 1 << 6,
152
153#define	ZIO_FLAG_AGG_INHERIT	(ZIO_FLAG_CANFAIL - 1)
154
155	/*
156	 * Flags inherited by ddt, gang, and vdev children.
157	 */
158	ZIO_FLAG_CANFAIL	= 1 << 7,	/* must be first for INHERIT */
159	ZIO_FLAG_SPECULATIVE	= 1 << 8,
160	ZIO_FLAG_CONFIG_WRITER	= 1 << 9,
161	ZIO_FLAG_DONT_RETRY	= 1 << 10,
162	ZIO_FLAG_DONT_CACHE	= 1 << 11,
163	ZIO_FLAG_NODATA		= 1 << 12,
164	ZIO_FLAG_INDUCE_DAMAGE	= 1 << 13,
165	ZIO_FLAG_IO_ALLOCATING	= 1 << 14,
166
167#define	ZIO_FLAG_DDT_INHERIT	(ZIO_FLAG_IO_RETRY - 1)
168#define	ZIO_FLAG_GANG_INHERIT	(ZIO_FLAG_IO_RETRY - 1)
169
170	/*
171	 * Flags inherited by vdev children.
172	 */
173	ZIO_FLAG_IO_RETRY	= 1 << 15,	/* must be first for INHERIT */
174	ZIO_FLAG_PROBE		= 1 << 16,
175	ZIO_FLAG_TRYHARD	= 1 << 17,
176	ZIO_FLAG_OPTIONAL	= 1 << 18,
177
178#define	ZIO_FLAG_VDEV_INHERIT	(ZIO_FLAG_DONT_QUEUE - 1)
179
180	/*
181	 * Flags not inherited by any children.
182	 */
183	ZIO_FLAG_DONT_QUEUE	= 1 << 19,	/* must be first for INHERIT */
184	ZIO_FLAG_DONT_PROPAGATE	= 1 << 20,
185	ZIO_FLAG_IO_BYPASS	= 1 << 21,
186	ZIO_FLAG_IO_REWRITE	= 1 << 22,
187	ZIO_FLAG_RAW		= 1 << 23,
188	ZIO_FLAG_GANG_CHILD	= 1 << 24,
189	ZIO_FLAG_DDT_CHILD	= 1 << 25,
190	ZIO_FLAG_GODFATHER	= 1 << 26,
191	ZIO_FLAG_NOPWRITE	= 1 << 27,
192	ZIO_FLAG_REEXECUTED	= 1 << 28,
193	ZIO_FLAG_DELEGATED	= 1 << 29,
194};
195
196#define	ZIO_FLAG_MUSTSUCCEED		0
197
198#define	ZIO_DDT_CHILD_FLAGS(zio)				\
199	(((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) |		\
200	ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
201
202#define	ZIO_GANG_CHILD_FLAGS(zio)				\
203	(((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) |		\
204	ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
205
206#define	ZIO_VDEV_CHILD_FLAGS(zio)				\
207	(((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) |		\
208	ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_CANFAIL)
209
210#define	ZIO_CHILD_BIT(x)		(1 << (x))
211#define	ZIO_CHILD_BIT_IS_SET(val, x)	((val) & (1 << (x)))
212
213enum zio_child {
214	ZIO_CHILD_VDEV = 0,
215	ZIO_CHILD_GANG,
216	ZIO_CHILD_DDT,
217	ZIO_CHILD_LOGICAL,
218	ZIO_CHILD_TYPES
219};
220
221#define	ZIO_CHILD_VDEV_BIT		ZIO_CHILD_BIT(ZIO_CHILD_VDEV)
222#define	ZIO_CHILD_GANG_BIT		ZIO_CHILD_BIT(ZIO_CHILD_GANG)
223#define	ZIO_CHILD_DDT_BIT		ZIO_CHILD_BIT(ZIO_CHILD_DDT)
224#define	ZIO_CHILD_LOGICAL_BIT		ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL)
225#define	ZIO_CHILD_ALL_BITS					\
226	(ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT |		\
227	ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT)
228
229enum zio_wait_type {
230	ZIO_WAIT_READY = 0,
231	ZIO_WAIT_DONE,
232	ZIO_WAIT_TYPES
233};
234
235/*
236 * These are bespoke errnos used in ZFS. We map them to their closest FreeBSD
237 * equivalents. This gives us more useful error messages from strerror(3).
238 */
239#define	ECKSUM	EINTEGRITY
240#define	EFRAGS	ENOSPC
241
242typedef void zio_done_func_t(zio_t *zio);
243
244extern boolean_t zio_dva_throttle_enabled;
245extern const char *zio_type_name[ZIO_TYPES];
246
247/*
248 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
249 * identifies any block in the pool.  By convention, the meta-objset (MOS)
250 * is objset 0, and the meta-dnode is object 0.  This covers all blocks
251 * except root blocks and ZIL blocks, which are defined as follows:
252 *
253 * Root blocks (objset_phys_t) are object 0, level -1:  <objset, 0, -1, 0>.
254 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
255 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
256 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>.
257 *
258 * Note: this structure is called a bookmark because its original purpose
259 * was to remember where to resume a pool-wide traverse.
260 *
261 * Note: this structure is passed between userland and the kernel, and is
262 * stored on disk (by virtue of being incorporated into other on-disk
263 * structures, e.g. dsl_scan_phys_t).
264 */
265typedef struct zbookmark_phys {
266	uint64_t	zb_objset;
267	uint64_t	zb_object;
268	int64_t		zb_level;
269	uint64_t	zb_blkid;
270} zbookmark_phys_t;
271
272#define	SET_BOOKMARK(zb, objset, object, level, blkid)  \
273{                                                       \
274	(zb)->zb_objset = objset;                       \
275	(zb)->zb_object = object;                       \
276	(zb)->zb_level = level;                         \
277	(zb)->zb_blkid = blkid;                         \
278}
279
280#define	ZB_DESTROYED_OBJSET	(-1ULL)
281
282#define	ZB_ROOT_OBJECT		(0ULL)
283#define	ZB_ROOT_LEVEL		(-1LL)
284#define	ZB_ROOT_BLKID		(0ULL)
285
286#define	ZB_ZIL_OBJECT		(0ULL)
287#define	ZB_ZIL_LEVEL		(-2LL)
288
289#define	ZB_DNODE_LEVEL		(-3LL)
290#define	ZB_DNODE_BLKID		(0ULL)
291
292#define	ZB_IS_ZERO(zb)						\
293	((zb)->zb_objset == 0 && (zb)->zb_object == 0 &&	\
294	(zb)->zb_level == 0 && (zb)->zb_blkid == 0)
295#define	ZB_IS_ROOT(zb)				\
296	((zb)->zb_object == ZB_ROOT_OBJECT &&	\
297	(zb)->zb_level == ZB_ROOT_LEVEL &&	\
298	(zb)->zb_blkid == ZB_ROOT_BLKID)
299
300typedef struct zio_prop {
301	enum zio_checksum	zp_checksum;
302	enum zio_compress	zp_compress;
303	dmu_object_type_t	zp_type;
304	uint8_t			zp_level;
305	uint8_t			zp_copies;
306	boolean_t		zp_dedup;
307	boolean_t		zp_dedup_verify;
308	boolean_t		zp_nopwrite;
309	uint32_t		zp_zpl_smallblk;
310} zio_prop_t;
311
312typedef struct zio_cksum_report zio_cksum_report_t;
313
314typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
315    const void *good_data);
316typedef void zio_cksum_free_f(void *cbdata, size_t size);
317
318struct zio_bad_cksum;				/* defined in zio_checksum.h */
319struct dnode_phys;
320struct abd;
321
322struct zio_cksum_report {
323	struct zio_cksum_report *zcr_next;
324	nvlist_t		*zcr_ereport;
325	nvlist_t		*zcr_detector;
326	void			*zcr_cbdata;
327	size_t			zcr_cbinfo;	/* passed to zcr_free() */
328	uint64_t		zcr_align;
329	uint64_t		zcr_length;
330	zio_cksum_finish_f	*zcr_finish;
331	zio_cksum_free_f	*zcr_free;
332
333	/* internal use only */
334	struct zio_bad_cksum	*zcr_ckinfo;	/* information from failure */
335};
336
337typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
338    void *arg);
339
340zio_vsd_cksum_report_f	zio_vsd_default_cksum_report;
341
342typedef struct zio_vsd_ops {
343	zio_done_func_t		*vsd_free;
344	zio_vsd_cksum_report_f	*vsd_cksum_report;
345} zio_vsd_ops_t;
346
347typedef struct zio_gang_node {
348	zio_gbh_phys_t		*gn_gbh;
349	struct zio_gang_node	*gn_child[SPA_GBH_NBLKPTRS];
350} zio_gang_node_t;
351
352typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
353    zio_gang_node_t *gn, struct abd *data, uint64_t offset);
354
355typedef void zio_transform_func_t(zio_t *zio, struct abd *data, uint64_t size);
356
357typedef struct zio_transform {
358	struct abd		*zt_orig_abd;
359	uint64_t		zt_orig_size;
360	uint64_t		zt_bufsize;
361	zio_transform_func_t	*zt_transform;
362	struct zio_transform	*zt_next;
363} zio_transform_t;
364
365typedef zio_t *zio_pipe_stage_t(zio_t *zio);
366
367/*
368 * The io_reexecute flags are distinct from io_flags because the child must
369 * be able to propagate them to the parent.  The normal io_flags are local
370 * to the zio, not protected by any lock, and not modifiable by children;
371 * the reexecute flags are protected by io_lock, modifiable by children,
372 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
373 */
374#define	ZIO_REEXECUTE_NOW	0x01
375#define	ZIO_REEXECUTE_SUSPEND	0x02
376
377typedef struct zio_alloc_list {
378	list_t  zal_list;
379	uint64_t zal_size;
380} zio_alloc_list_t;
381
382typedef struct zio_link {
383	zio_t		*zl_parent;
384	zio_t		*zl_child;
385	list_node_t	zl_parent_node;
386	list_node_t	zl_child_node;
387} zio_link_t;
388
389/*
390 * Used for TRIM kstat.
391 */
392typedef struct zio_trim_stats {
393	/*
394	 * Number of bytes successfully TRIMmed.
395	 */
396	kstat_named_t bytes;
397
398	/*
399	 * Number of successful TRIM requests.
400	 */
401	kstat_named_t success;
402
403	/*
404	 * Number of TRIM requests that failed because TRIM is not
405	 * supported.
406	 */
407	kstat_named_t unsupported;
408
409	/*
410	 * Number of TRIM requests that failed for other reasons.
411	 */
412	kstat_named_t failed;
413} zio_trim_stats_t;
414
415extern zio_trim_stats_t zio_trim_stats;
416
417#define ZIO_TRIM_STAT_INCR(stat, val) \
418	atomic_add_64(&zio_trim_stats.stat.value.ui64, (val));
419#define ZIO_TRIM_STAT_BUMP(stat) \
420	ZIO_TRIM_STAT_INCR(stat, 1);
421
422struct zio {
423	/* Core information about this I/O */
424	zbookmark_phys_t	io_bookmark;
425	zio_prop_t	io_prop;
426	zio_type_t	io_type;
427	enum zio_child	io_child_type;
428	int		io_cmd;
429	zio_priority_t	io_priority;
430	uint8_t		io_reexecute;
431	uint8_t		io_state[ZIO_WAIT_TYPES];
432	uint64_t	io_txg;
433	spa_t		*io_spa;
434	blkptr_t	*io_bp;
435	blkptr_t	*io_bp_override;
436	blkptr_t	io_bp_copy;
437	list_t		io_parent_list;
438	list_t		io_child_list;
439	zio_t		*io_logical;
440	zio_transform_t *io_transform_stack;
441
442	/* Callback info */
443	zio_done_func_t	*io_ready;
444	zio_done_func_t	*io_children_ready;
445	zio_done_func_t	*io_physdone;
446	zio_done_func_t	*io_done;
447	void		*io_private;
448	int64_t		io_prev_space_delta;	/* DMU private */
449	blkptr_t	io_bp_orig;
450
451	/* Data represented by this I/O */
452	struct abd	*io_abd;
453	struct abd	*io_orig_abd;
454	uint64_t	io_size;
455	uint64_t	io_orig_size;
456	/* io_lsize != io_orig_size iff this is a raw write */
457	uint64_t	io_lsize;
458
459	/* Stuff for the vdev stack */
460	vdev_t		*io_vd;
461	void		*io_vsd;
462	const zio_vsd_ops_t *io_vsd_ops;
463	metaslab_class_t *io_metaslab_class;	/* dva throttle class */
464
465	uint64_t	io_offset;
466	hrtime_t	io_timestamp;
467	hrtime_t	io_queued_timestamp;
468	hrtime_t	io_target_timestamp;
469	avl_node_t	io_queue_node;
470	avl_node_t	io_offset_node;
471	avl_node_t	io_alloc_node;
472	zio_alloc_list_t	io_alloc_list;
473
474#ifdef __FreeBSD__
475	struct bio	*io_bio;
476#endif
477
478	/* Internal pipeline state */
479	enum zio_flag	io_flags;
480	enum zio_stage	io_stage;
481	enum zio_stage	io_pipeline;
482	enum zio_flag	io_orig_flags;
483	enum zio_stage	io_orig_stage;
484	enum zio_stage	io_orig_pipeline;
485	enum zio_stage	io_pipeline_trace;
486	int		io_error;
487	int		io_child_error[ZIO_CHILD_TYPES];
488	uint64_t	io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
489	uint64_t	io_child_count;
490	uint64_t	io_phys_children;
491	uint64_t	io_parent_count;
492	uint64_t	*io_stall;
493	zio_t		*io_gang_leader;
494	zio_gang_node_t	*io_gang_tree;
495	void		*io_executor;
496	void		*io_waiter;
497	kmutex_t	io_lock;
498	kcondvar_t	io_cv;
499	int		io_allocator;
500
501	/* FMA state */
502	zio_cksum_report_t *io_cksum_report;
503	uint64_t	io_ena;
504
505	/* Taskq dispatching state */
506	taskq_ent_t	io_tqent;
507
508	avl_node_t	io_trim_node;
509	list_node_t	io_trim_link;
510};
511
512extern int zio_bookmark_compare(const void *, const void *);
513
514extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
515    zio_done_func_t *done, void *priv, enum zio_flag flags);
516
517extern zio_t *zio_root(spa_t *spa,
518    zio_done_func_t *done, void *priv, enum zio_flag flags);
519
520extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
521    struct abd *data, uint64_t lsize, zio_done_func_t *done, void *priv,
522    zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
523
524extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
525    struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp,
526    zio_done_func_t *ready, zio_done_func_t *children_ready,
527    zio_done_func_t *physdone, zio_done_func_t *done,
528    void *priv, zio_priority_t priority, enum zio_flag flags,
529    const zbookmark_phys_t *zb);
530
531extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
532    struct abd *data, uint64_t size, zio_done_func_t *done, void *priv,
533    zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb);
534
535extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
536    boolean_t nopwrite);
537
538extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
539
540extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
541    const blkptr_t *bp,
542    zio_done_func_t *done, void *priv, enum zio_flag flags);
543
544extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
545    uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv,
546    zio_priority_t priority, enum zio_flag flags);
547
548extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
549    uint64_t size, struct abd *data, int checksum,
550    zio_done_func_t *done, void *priv, zio_priority_t priority,
551    enum zio_flag flags, boolean_t labels);
552
553extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
554    uint64_t size, struct abd *data, int checksum,
555    zio_done_func_t *done, void *priv, zio_priority_t priority,
556    enum zio_flag flags, boolean_t labels);
557
558extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
559    const blkptr_t *bp, uint64_t size, enum zio_flag flags);
560
561extern int zio_alloc_zil(spa_t *spa, uint64_t objset, uint64_t txg,
562    blkptr_t *new_bp, blkptr_t *old_bp, uint64_t size, boolean_t *slog);
563extern void zio_flush(zio_t *zio, vdev_t *vd);
564extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset,
565    uint64_t size);
566extern void zio_shrink(zio_t *zio, uint64_t size);
567
568extern int zio_wait(zio_t *zio);
569extern void zio_nowait(zio_t *zio);
570extern void zio_execute(zio_t *zio);
571extern void zio_interrupt(zio_t *zio);
572extern void zio_delay_init(zio_t *zio);
573extern void zio_delay_interrupt(zio_t *zio);
574
575extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **);
576extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **);
577extern zio_t *zio_unique_parent(zio_t *cio);
578extern void zio_add_child(zio_t *pio, zio_t *cio);
579
580extern void *zio_buf_alloc(size_t size);
581extern void zio_buf_free(void *buf, size_t size);
582extern void *zio_data_buf_alloc(size_t size);
583extern void zio_data_buf_free(void *buf, size_t size);
584
585extern void zio_push_transform(zio_t *zio, struct abd *abd, uint64_t size,
586    uint64_t bufsize, zio_transform_func_t *transform);
587extern void zio_pop_transforms(zio_t *zio);
588
589extern void zio_resubmit_stage_async(void *);
590
591extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
592    uint64_t offset, struct abd *data, uint64_t size, int type,
593    zio_priority_t priority, enum zio_flag flags,
594    zio_done_func_t *done, void *priv);
595
596extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
597    struct abd *data, uint64_t size, zio_type_t type, zio_priority_t priority,
598    enum zio_flag flags, zio_done_func_t *done, void *priv);
599
600extern void zio_vdev_io_bypass(zio_t *zio);
601extern void zio_vdev_io_reissue(zio_t *zio);
602extern void zio_vdev_io_redone(zio_t *zio);
603
604extern void zio_change_priority(zio_t *pio, zio_priority_t priority);
605
606extern void zio_checksum_verified(zio_t *zio);
607extern int zio_worst_error(int e1, int e2);
608
609extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
610    enum zio_checksum parent);
611extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
612    enum zio_checksum child, enum zio_checksum parent);
613extern enum zio_compress zio_compress_select(spa_t *spa,
614    enum zio_compress child, enum zio_compress parent);
615
616extern void zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t);
617extern int zio_resume(spa_t *spa);
618extern void zio_resume_wait(spa_t *spa);
619
620/*
621 * Initial setup and teardown.
622 */
623extern void zio_init(void);
624extern void zio_fini(void);
625
626/*
627 * Fault injection
628 */
629struct zinject_record;
630extern uint32_t zio_injection_enabled;
631extern int zio_inject_fault(char *name, int flags, int *id,
632    struct zinject_record *record);
633extern int zio_inject_list_next(int *id, char *name, size_t buflen,
634    struct zinject_record *record);
635extern int zio_clear_fault(int id);
636extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
637extern int zio_handle_fault_injection(zio_t *zio, int error);
638extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
639extern int zio_handle_label_injection(zio_t *zio, int error);
640extern void zio_handle_ignored_writes(zio_t *zio);
641extern hrtime_t zio_handle_io_delay(zio_t *zio);
642
643/*
644 * Checksum ereport functions
645 */
646extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
647    uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
648extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
649    const void *good_data, const void *bad_data, boolean_t drop_if_identical);
650
651extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
652extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
653
654/* If we have the good data in hand, this function can be used */
655extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
656    struct zio *zio, uint64_t offset, uint64_t length,
657    const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
658
659/* Called from spa_sync(), but primarily an injection handler */
660extern void spa_handle_ignored_writes(spa_t *spa);
661
662/* zbookmark_phys functions */
663boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp,
664    const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
665int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2,
666    uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);
667
668#ifdef	__cplusplus
669}
670#endif
671
672#endif	/* _ZIO_H */
673