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 2019, Joyent, Inc.
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
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	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#define	ZIO_CRYPT_ON_VALUE	ZIO_CRYPT_AES_256_CCM
108#define	ZIO_CRYPT_DEFAULT	ZIO_CRYPT_OFF
109
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
115
116/*
117 * The number of "legacy" compression functions which can be set on individual
118 * objects.
119 */
120#define	ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
121
122/*
123 * The meaning of "compress = on" selected by the compression features enabled
124 * on a given pool.
125 */
126#define	ZIO_COMPRESS_LEGACY_ON_VALUE	ZIO_COMPRESS_LZJB
127#define	ZIO_COMPRESS_LZ4_ON_VALUE	ZIO_COMPRESS_LZ4
128
129#define	ZIO_COMPRESS_DEFAULT		ZIO_COMPRESS_OFF
130
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_ON ||		\
144	(compress) == ZIO_COMPRESS_OFF)
145
146#define	ZIO_FAILURE_MODE_WAIT		0
147#define	ZIO_FAILURE_MODE_CONTINUE	1
148#define	ZIO_FAILURE_MODE_PANIC		2
149
150typedef enum zio_suspend_reason {
151	ZIO_SUSPEND_NONE = 0,
152	ZIO_SUSPEND_IOERR,
153	ZIO_SUSPEND_MMP,
154} zio_suspend_reason_t;
155
156enum zio_flag {
157	/*
158	 * Flags inherited by gang, ddt, and vdev children,
159	 * and that must be equal for two zios to aggregate
160	 */
161	ZIO_FLAG_DONT_AGGREGATE	= 1 << 0,
162	ZIO_FLAG_IO_REPAIR	= 1 << 1,
163	ZIO_FLAG_SELF_HEAL	= 1 << 2,
164	ZIO_FLAG_RESILVER	= 1 << 3,
165	ZIO_FLAG_SCRUB		= 1 << 4,
166	ZIO_FLAG_SCAN_THREAD	= 1 << 5,
167	ZIO_FLAG_PHYSICAL	= 1 << 6,
168
169#define	ZIO_FLAG_AGG_INHERIT	(ZIO_FLAG_CANFAIL - 1)
170
171	/*
172	 * Flags inherited by ddt, gang, and vdev children.
173	 */
174	ZIO_FLAG_CANFAIL	= 1 << 7,	/* must be first for INHERIT */
175	ZIO_FLAG_SPECULATIVE	= 1 << 8,
176	ZIO_FLAG_CONFIG_WRITER	= 1 << 9,
177	ZIO_FLAG_DONT_RETRY	= 1 << 10,
178	ZIO_FLAG_DONT_CACHE	= 1 << 11,
179	ZIO_FLAG_NODATA		= 1 << 12,
180	ZIO_FLAG_INDUCE_DAMAGE	= 1 << 13,
181	ZIO_FLAG_IO_ALLOCATING	= 1 << 14,
182
183#define	ZIO_FLAG_DDT_INHERIT	(ZIO_FLAG_IO_RETRY - 1)
184#define	ZIO_FLAG_GANG_INHERIT	(ZIO_FLAG_IO_RETRY - 1)
185
186	/*
187	 * Flags inherited by vdev children.
188	 */
189	ZIO_FLAG_IO_RETRY	= 1 << 15,	/* must be first for INHERIT */
190	ZIO_FLAG_PROBE		= 1 << 16,
191	ZIO_FLAG_TRYHARD	= 1 << 17,
192	ZIO_FLAG_OPTIONAL	= 1 << 18,
193
194#define	ZIO_FLAG_VDEV_INHERIT	(ZIO_FLAG_DONT_QUEUE - 1)
195
196	/*
197	 * Flags not inherited by any children.
198	 */
199	ZIO_FLAG_DONT_QUEUE	= 1 << 19,	/* must be first for INHERIT */
200	ZIO_FLAG_DONT_PROPAGATE	= 1 << 20,
201	ZIO_FLAG_IO_BYPASS	= 1 << 21,
202	ZIO_FLAG_IO_REWRITE	= 1 << 22,
203	ZIO_FLAG_RAW_COMPRESS	= 1 << 23,
204	ZIO_FLAG_RAW_ENCRYPT	= 1 << 24,
205	ZIO_FLAG_GANG_CHILD	= 1 << 25,
206	ZIO_FLAG_DDT_CHILD	= 1 << 26,
207	ZIO_FLAG_GODFATHER	= 1 << 27,
208	ZIO_FLAG_NOPWRITE	= 1 << 28,
209	ZIO_FLAG_REEXECUTED	= 1 << 29,
210	ZIO_FLAG_DELEGATED	= 1 << 30,
211};
212
213#define	ZIO_FLAG_MUSTSUCCEED		0
214#define	ZIO_FLAG_RAW	(ZIO_FLAG_RAW_COMPRESS | ZIO_FLAG_RAW_ENCRYPT)
215
216#define	ZIO_DDT_CHILD_FLAGS(zio)				\
217	(((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) |		\
218	ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
219
220#define	ZIO_GANG_CHILD_FLAGS(zio)				\
221	(((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) |		\
222	ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
223
224#define	ZIO_VDEV_CHILD_FLAGS(zio)				\
225	(((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) |		\
226	ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_CANFAIL)
227
228#define	ZIO_CHILD_BIT(x)		(1 << (x))
229#define	ZIO_CHILD_BIT_IS_SET(val, x)	((val) & (1 << (x)))
230
231enum zio_child {
232	ZIO_CHILD_VDEV = 0,
233	ZIO_CHILD_GANG,
234	ZIO_CHILD_DDT,
235	ZIO_CHILD_LOGICAL,
236	ZIO_CHILD_TYPES
237};
238
239#define	ZIO_CHILD_VDEV_BIT		ZIO_CHILD_BIT(ZIO_CHILD_VDEV)
240#define	ZIO_CHILD_GANG_BIT		ZIO_CHILD_BIT(ZIO_CHILD_GANG)
241#define	ZIO_CHILD_DDT_BIT		ZIO_CHILD_BIT(ZIO_CHILD_DDT)
242#define	ZIO_CHILD_LOGICAL_BIT		ZIO_CHILD_BIT(ZIO_CHILD_LOGICAL)
243#define	ZIO_CHILD_ALL_BITS					\
244	(ZIO_CHILD_VDEV_BIT | ZIO_CHILD_GANG_BIT |		\
245	ZIO_CHILD_DDT_BIT | ZIO_CHILD_LOGICAL_BIT)
246
247enum zio_wait_type {
248	ZIO_WAIT_READY = 0,
249	ZIO_WAIT_DONE,
250	ZIO_WAIT_TYPES
251};
252
253/*
254 * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
255 * graveyard) to indicate checksum errors and fragmentation.
256 */
257#define	ECKSUM	EBADE
258#define	EFRAGS	EBADR
259
260typedef void zio_done_func_t(zio_t *zio);
261
262extern boolean_t zio_dva_throttle_enabled;
263extern const char *zio_type_name[ZIO_TYPES];
264
265/*
266 * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
267 * identifies any block in the pool.  By convention, the meta-objset (MOS)
268 * is objset 0, and the meta-dnode is object 0.  This covers all blocks
269 * except root blocks and ZIL blocks, which are defined as follows:
270 *
271 * Root blocks (objset_phys_t) are object 0, level -1:  <objset, 0, -1, 0>.
272 * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
273 * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
274 * dnode visit bookmarks are <objset, object id of dnode, -3, 0>.
275 *
276 * Note: this structure is called a bookmark because its original purpose
277 * was to remember where to resume a pool-wide traverse.
278 *
279 * Note: this structure is passed between userland and the kernel, and is
280 * stored on disk (by virtue of being incorporated into other on-disk
281 * structures, e.g. dsl_scan_phys_t).
282 */
283typedef struct zbookmark_phys {
284	uint64_t	zb_objset;
285	uint64_t	zb_object;
286	int64_t		zb_level;
287	uint64_t	zb_blkid;
288} zbookmark_phys_t;
289
290#define	SET_BOOKMARK(zb, objset, object, level, blkid)  \
291{                                                       \
292	(zb)->zb_objset = objset;                       \
293	(zb)->zb_object = object;                       \
294	(zb)->zb_level = level;                         \
295	(zb)->zb_blkid = blkid;                         \
296}
297
298#define	ZB_DESTROYED_OBJSET	(-1ULL)
299
300#define	ZB_ROOT_OBJECT		(0ULL)
301#define	ZB_ROOT_LEVEL		(-1LL)
302#define	ZB_ROOT_BLKID		(0ULL)
303
304#define	ZB_ZIL_OBJECT		(0ULL)
305#define	ZB_ZIL_LEVEL		(-2LL)
306
307#define	ZB_DNODE_LEVEL		(-3LL)
308#define	ZB_DNODE_BLKID		(0ULL)
309
310#define	ZB_IS_ZERO(zb)						\
311	((zb)->zb_objset == 0 && (zb)->zb_object == 0 &&	\
312	(zb)->zb_level == 0 && (zb)->zb_blkid == 0)
313#define	ZB_IS_ROOT(zb)				\
314	((zb)->zb_object == ZB_ROOT_OBJECT &&	\
315	(zb)->zb_level == ZB_ROOT_LEVEL &&	\
316	(zb)->zb_blkid == ZB_ROOT_BLKID)
317
318typedef struct zio_prop {
319	enum zio_checksum	zp_checksum;
320	enum zio_compress	zp_compress;
321	dmu_object_type_t	zp_type;
322	uint8_t			zp_level;
323	uint8_t			zp_copies;
324	boolean_t		zp_dedup;
325	boolean_t		zp_dedup_verify;
326	boolean_t		zp_nopwrite;
327	uint32_t		zp_zpl_smallblk;
328	boolean_t		zp_encrypt;
329	boolean_t		zp_byteorder;
330	uint8_t			zp_salt[ZIO_DATA_SALT_LEN];
331	uint8_t			zp_iv[ZIO_DATA_IV_LEN];
332	uint8_t			zp_mac[ZIO_DATA_MAC_LEN];
333} zio_prop_t;
334
335typedef struct zio_cksum_report zio_cksum_report_t;
336
337typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
338    const abd_t *good_data);
339typedef void zio_cksum_free_f(void *cbdata, size_t size);
340
341struct zio_bad_cksum;				/* defined in zio_checksum.h */
342struct dnode_phys;
343struct abd;
344
345struct zio_cksum_report {
346	struct zio_cksum_report *zcr_next;
347	nvlist_t		*zcr_ereport;
348	nvlist_t		*zcr_detector;
349	void			*zcr_cbdata;
350	size_t			zcr_cbinfo;	/* passed to zcr_free() */
351	uint64_t		zcr_align;
352	uint64_t		zcr_length;
353	zio_cksum_finish_f	*zcr_finish;
354	zio_cksum_free_f	*zcr_free;
355
356	/* internal use only */
357	struct zio_bad_cksum	*zcr_ckinfo;	/* information from failure */
358};
359
360typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
361    void *arg);
362
363zio_vsd_cksum_report_f	zio_vsd_default_cksum_report;
364
365typedef struct zio_vsd_ops {
366	zio_done_func_t		*vsd_free;
367	zio_vsd_cksum_report_f	*vsd_cksum_report;
368} zio_vsd_ops_t;
369
370typedef struct zio_gang_node {
371	zio_gbh_phys_t		*gn_gbh;
372	struct zio_gang_node	*gn_child[SPA_GBH_NBLKPTRS];
373} zio_gang_node_t;
374
375typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
376    zio_gang_node_t *gn, struct abd *data, uint64_t offset);
377
378typedef void zio_transform_func_t(zio_t *zio, struct abd *data, uint64_t size);
379
380typedef struct zio_transform {
381	struct abd		*zt_orig_abd;
382	uint64_t		zt_orig_size;
383	uint64_t		zt_bufsize;
384	zio_transform_func_t	*zt_transform;
385	struct zio_transform	*zt_next;
386} zio_transform_t;
387
388typedef int zio_pipe_stage_t(zio_t *zio);
389
390/*
391 * The io_reexecute flags are distinct from io_flags because the child must
392 * be able to propagate them to the parent.  The normal io_flags are local
393 * to the zio, not protected by any lock, and not modifiable by children;
394 * the reexecute flags are protected by io_lock, modifiable by children,
395 * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
396 */
397#define	ZIO_REEXECUTE_NOW	0x01
398#define	ZIO_REEXECUTE_SUSPEND	0x02
399
400/*
401 * The io_trim flags are used to specify the type of TRIM to perform.  They
402 * only apply to ZIO_TYPE_TRIM zios and are distinct from io_flags.
403 */
404enum trim_flag {
405	ZIO_TRIM_SECURE		= 1 << 0,
406};
407
408typedef struct zio_alloc_list {
409	list_t  zal_list;
410	uint64_t zal_size;
411} zio_alloc_list_t;
412
413typedef struct zio_link {
414	zio_t		*zl_parent;
415	zio_t		*zl_child;
416	list_node_t	zl_parent_node;
417	list_node_t	zl_child_node;
418} zio_link_t;
419
420struct zio {
421	/* Core information about this I/O */
422	zbookmark_phys_t	io_bookmark;
423	zio_prop_t	io_prop;
424	zio_type_t	io_type;
425	enum zio_child	io_child_type;
426	enum trim_flag	io_trim_flags;
427	int		io_cmd;
428	zio_priority_t	io_priority;
429	uint8_t		io_reexecute;
430	uint8_t		io_state[ZIO_WAIT_TYPES];
431	uint64_t	io_txg;
432	spa_t		*io_spa;
433	blkptr_t	*io_bp;
434	blkptr_t	*io_bp_override;
435	blkptr_t	io_bp_copy;
436	list_t		io_parent_list;
437	list_t		io_child_list;
438	zio_t		*io_logical;
439	zio_transform_t *io_transform_stack;
440
441	/* Callback info */
442	zio_done_func_t	*io_ready;
443	zio_done_func_t	*io_children_ready;
444	zio_done_func_t	*io_physdone;
445	zio_done_func_t	*io_done;
446	void		*io_private;
447	int64_t		io_prev_space_delta;	/* DMU private */
448	blkptr_t	io_bp_orig;
449
450	/* Data represented by this I/O */
451	struct abd	*io_abd;
452	struct abd	*io_orig_abd;
453	uint64_t	io_size;
454	uint64_t	io_orig_size;
455	/* io_lsize != io_orig_size iff this is a raw write */
456	uint64_t	io_lsize;
457
458	/* Stuff for the vdev stack */
459	vdev_t		*io_vd;
460	void		*io_vsd;
461	const zio_vsd_ops_t *io_vsd_ops;
462	metaslab_class_t *io_metaslab_class;	/* dva throttle class */
463
464	uint64_t	io_offset;
465	hrtime_t	io_timestamp;
466	hrtime_t	io_queued_timestamp;
467	hrtime_t	io_target_timestamp;
468	avl_node_t	io_queue_node;
469	avl_node_t	io_offset_node;
470	avl_node_t	io_alloc_node;
471	zio_alloc_list_t	io_alloc_list;
472
473	/* Internal pipeline state */
474	enum zio_flag	io_flags;
475	enum zio_stage	io_stage;
476	enum zio_stage	io_pipeline;
477	enum zio_flag	io_orig_flags;
478	enum zio_stage	io_orig_stage;
479	enum zio_stage	io_orig_pipeline;
480	enum zio_stage	io_pipeline_trace;
481	int		io_error;
482	int		io_child_error[ZIO_CHILD_TYPES];
483	uint64_t	io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
484	uint64_t	io_child_count;
485	uint64_t	io_phys_children;
486	uint64_t	io_parent_count;
487	uint64_t	*io_stall;
488	zio_t		*io_gang_leader;
489	zio_gang_node_t	*io_gang_tree;
490	void		*io_executor;
491	void		*io_waiter;
492	kmutex_t	io_lock;
493	kcondvar_t	io_cv;
494	int		io_allocator;
495
496	/* FMA state */
497	zio_cksum_report_t *io_cksum_report;
498	uint64_t	io_ena;
499
500	/* Taskq dispatching state */
501	taskq_ent_t	io_tqent;
502};
503
504extern int zio_bookmark_compare(const void *, const void *);
505
506extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
507    zio_done_func_t *done, void *private, enum zio_flag flags);
508
509extern zio_t *zio_root(spa_t *spa,
510    zio_done_func_t *done, void *private, enum zio_flag flags);
511
512extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp,
513    struct abd *data, uint64_t lsize, zio_done_func_t *done, void *private,
514    zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
515
516extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
517    struct abd *data, uint64_t size, uint64_t psize, const zio_prop_t *zp,
518    zio_done_func_t *ready, zio_done_func_t *children_ready,
519    zio_done_func_t *physdone, zio_done_func_t *done,
520    void *private, zio_priority_t priority, enum zio_flag flags,
521    const zbookmark_phys_t *zb);
522
523extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
524    struct abd *data, uint64_t size, zio_done_func_t *done, void *private,
525    zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb);
526
527extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
528    boolean_t nopwrite);
529
530extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
531
532extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
533    const blkptr_t *bp,
534    zio_done_func_t *done, void *private, enum zio_flag flags);
535
536extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
537    zio_done_func_t *done, void *private, enum zio_flag flags);
538
539extern zio_t *zio_trim(zio_t *pio, vdev_t *vd, uint64_t offset, uint64_t size,
540    zio_done_func_t *done, void *private, zio_priority_t priority,
541    enum zio_flag flags, enum trim_flag trim_flags);
542
543extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
544    uint64_t size, struct abd *data, int checksum,
545    zio_done_func_t *done, void *private, zio_priority_t priority,
546    enum zio_flag flags, boolean_t labels);
547
548extern zio_t *zio_write_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 *private, zio_priority_t priority,
551    enum zio_flag flags, boolean_t labels);
552
553extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
554    const blkptr_t *bp, enum zio_flag flags);
555
556extern int zio_alloc_zil(spa_t *spa, objset_t *os, uint64_t txg,
557    blkptr_t *new_bp, blkptr_t *old_bp, uint64_t size, boolean_t *slog);
558extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
559extern void zio_flush(zio_t *zio, vdev_t *vd);
560extern void zio_shrink(zio_t *zio, uint64_t size);
561
562extern int zio_wait(zio_t *zio);
563extern void zio_nowait(zio_t *zio);
564extern void zio_execute(zio_t *zio);
565extern void zio_interrupt(zio_t *zio);
566extern void zio_delay_init(zio_t *zio);
567extern void zio_delay_interrupt(zio_t *zio);
568
569extern zio_t *zio_walk_parents(zio_t *cio, zio_link_t **);
570extern zio_t *zio_walk_children(zio_t *pio, zio_link_t **);
571extern zio_t *zio_unique_parent(zio_t *cio);
572extern void zio_add_child(zio_t *pio, zio_t *cio);
573
574extern void *zio_buf_alloc(size_t size);
575extern void zio_buf_free(void *buf, size_t size);
576extern void *zio_data_buf_alloc(size_t size);
577extern void zio_data_buf_free(void *buf, size_t size);
578
579extern void zio_push_transform(zio_t *zio, struct abd *abd, uint64_t size,
580    uint64_t bufsize, zio_transform_func_t *transform);
581extern void zio_pop_transforms(zio_t *zio);
582
583extern void zio_resubmit_stage_async(void *);
584
585extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
586    uint64_t offset, struct abd *data, uint64_t size, int type,
587    zio_priority_t priority, enum zio_flag flags,
588    zio_done_func_t *done, void *private);
589
590extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
591    struct abd *data, uint64_t size, zio_type_t type, zio_priority_t priority,
592    enum zio_flag flags, zio_done_func_t *done, void *private);
593
594extern void zio_vdev_io_bypass(zio_t *zio);
595extern void zio_vdev_io_reissue(zio_t *zio);
596extern void zio_vdev_io_redone(zio_t *zio);
597
598extern void zio_change_priority(zio_t *pio, zio_priority_t priority);
599
600extern void zio_checksum_verified(zio_t *zio);
601extern int zio_worst_error(int e1, int e2);
602
603extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
604    enum zio_checksum parent);
605extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
606    enum zio_checksum child, enum zio_checksum parent);
607extern enum zio_compress zio_compress_select(spa_t *spa,
608    enum zio_compress child, enum zio_compress parent);
609
610extern void zio_suspend(spa_t *spa, zio_t *zio, zio_suspend_reason_t);
611extern int zio_resume(spa_t *spa);
612extern void zio_resume_wait(spa_t *spa);
613
614/*
615 * Initial setup and teardown.
616 */
617extern void zio_init(void);
618extern void zio_fini(void);
619
620/*
621 * Fault injection
622 */
623struct zinject_record;
624extern uint32_t zio_injection_enabled;
625extern int zio_inject_fault(char *name, int flags, int *id,
626    struct zinject_record *record);
627extern int zio_inject_list_next(int *id, char *name, size_t buflen,
628    struct zinject_record *record);
629extern int zio_clear_fault(int id);
630extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
631extern int zio_handle_decrypt_injection(spa_t *spa, const zbookmark_phys_t *zb,
632    uint64_t type, int error);
633extern int zio_handle_fault_injection(zio_t *zio, int error);
634extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
635extern int zio_handle_label_injection(zio_t *zio, int error);
636extern void zio_handle_ignored_writes(zio_t *zio);
637extern hrtime_t zio_handle_io_delay(zio_t *zio);
638
639/*
640 * Checksum ereport functions
641 */
642extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd,
643    const zbookmark_phys_t *zb, struct zio *zio, uint64_t offset,
644    uint64_t length, void *arg, struct zio_bad_cksum *info);
645extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
646    const abd_t *good_data, const abd_t *bad_data, boolean_t drop_if_identical);
647
648extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
649extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
650
651/* If we have the good data in hand, this function can be used */
652extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
653    const zbookmark_phys_t *zb, struct zio *zio, uint64_t offset,
654    uint64_t length, const abd_t *good_data, const abd_t *bad_data,
655    struct zio_bad_cksum *info);
656
657/* Called from spa_sync(), but primarily an injection handler */
658extern void spa_handle_ignored_writes(spa_t *spa);
659
660/* zbookmark_phys functions */
661boolean_t zbookmark_subtree_completed(const struct dnode_phys *dnp,
662    const zbookmark_phys_t *subtree_root, const zbookmark_phys_t *last_block);
663int zbookmark_compare(uint16_t dbss1, uint8_t ibs1, uint16_t dbss2,
664    uint8_t ibs2, const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);
665
666#ifdef	__cplusplus
667}
668#endif
669
670#endif	/* _ZIO_H */
671