zio.h revision 270312 
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 */
28
29#ifndef _ZIO_H
30#define	_ZIO_H
31
32#include <sys/zfs_context.h>
33#include <sys/spa.h>
34#include <sys/txg.h>
35#include <sys/avl.h>
36#include <sys/kstat.h>
37#include <sys/fs/zfs.h>
38#include <sys/zio_impl.h>
39
40#ifdef	__cplusplus
41extern "C" {
42#endif
43
44/*
45 * Embedded checksum
46 */
47#define	ZEC_MAGIC	0x210da7ab10c7a11ULL
48
49typedef struct zio_eck {
50	uint64_t	zec_magic;	/* for validation, endianness	*/
51	zio_cksum_t	zec_cksum;	/* 256-bit checksum		*/
52} zio_eck_t;
53
54/*
55 * Gang block headers are self-checksumming and contain an array
56 * of block pointers.
57 */
58#define	SPA_GANGBLOCKSIZE	SPA_MINBLOCKSIZE
59#define	SPA_GBH_NBLKPTRS	((SPA_GANGBLOCKSIZE - \
60	sizeof (zio_eck_t)) / sizeof (blkptr_t))
61#define	SPA_GBH_FILLER		((SPA_GANGBLOCKSIZE - \
62	sizeof (zio_eck_t) - \
63	(SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
64	sizeof (uint64_t))
65
66typedef struct zio_gbh {
67	blkptr_t		zg_blkptr[SPA_GBH_NBLKPTRS];
68	uint64_t		zg_filler[SPA_GBH_FILLER];
69	zio_eck_t		zg_tail;
70} zio_gbh_phys_t;
71
72enum zio_checksum {
73	ZIO_CHECKSUM_INHERIT = 0,
74	ZIO_CHECKSUM_ON,
75	ZIO_CHECKSUM_OFF,
76	ZIO_CHECKSUM_LABEL,
77	ZIO_CHECKSUM_GANG_HEADER,
78	ZIO_CHECKSUM_ZILOG,
79	ZIO_CHECKSUM_FLETCHER_2,
80	ZIO_CHECKSUM_FLETCHER_4,
81	ZIO_CHECKSUM_SHA256,
82	ZIO_CHECKSUM_ZILOG2,
83	ZIO_CHECKSUM_NOPARITY,
84	ZIO_CHECKSUM_FUNCTIONS
85};
86
87/*
88 * The number of "legacy" compression functions which can be set on individual
89 * objects.
90 */
91#define	ZIO_CHECKSUM_LEGACY_FUNCTIONS ZIO_CHECKSUM_ZILOG2
92
93#define	ZIO_CHECKSUM_ON_VALUE	ZIO_CHECKSUM_FLETCHER_4
94#define	ZIO_CHECKSUM_DEFAULT	ZIO_CHECKSUM_ON
95
96#define	ZIO_CHECKSUM_MASK	0xffULL
97#define	ZIO_CHECKSUM_VERIFY	(1 << 8)
98
99#define	ZIO_DEDUPCHECKSUM	ZIO_CHECKSUM_SHA256
100#define	ZIO_DEDUPDITTO_MIN	100
101
102enum zio_compress {
103	ZIO_COMPRESS_INHERIT = 0,
104	ZIO_COMPRESS_ON,
105	ZIO_COMPRESS_OFF,
106	ZIO_COMPRESS_LZJB,
107	ZIO_COMPRESS_EMPTY,
108	ZIO_COMPRESS_GZIP_1,
109	ZIO_COMPRESS_GZIP_2,
110	ZIO_COMPRESS_GZIP_3,
111	ZIO_COMPRESS_GZIP_4,
112	ZIO_COMPRESS_GZIP_5,
113	ZIO_COMPRESS_GZIP_6,
114	ZIO_COMPRESS_GZIP_7,
115	ZIO_COMPRESS_GZIP_8,
116	ZIO_COMPRESS_GZIP_9,
117	ZIO_COMPRESS_ZLE,
118	ZIO_COMPRESS_LZ4,
119	ZIO_COMPRESS_FUNCTIONS
120};
121
122/*
123 * The number of "legacy" compression functions which can be set on individual
124 * objects.
125 */
126#define	ZIO_COMPRESS_LEGACY_FUNCTIONS ZIO_COMPRESS_LZ4
127
128/* N.B. when altering this value, also change BOOTFS_COMPRESS_VALID below */
129#define	ZIO_COMPRESS_ON_VALUE	ZIO_COMPRESS_LZJB
130#define	ZIO_COMPRESS_DEFAULT	ZIO_COMPRESS_OFF
131
132#define	BOOTFS_COMPRESS_VALID(compress)			\
133	((compress) == ZIO_COMPRESS_LZJB ||		\
134	(compress) == ZIO_COMPRESS_LZ4 ||		\
135	((compress) == ZIO_COMPRESS_ON &&		\
136	ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) ||	\
137	(compress) == ZIO_COMPRESS_OFF)
138
139#define	ZIO_FAILURE_MODE_WAIT		0
140#define	ZIO_FAILURE_MODE_CONTINUE	1
141#define	ZIO_FAILURE_MODE_PANIC		2
142
143typedef enum zio_priority {
144	ZIO_PRIORITY_SYNC_READ,
145	ZIO_PRIORITY_SYNC_WRITE,	/* ZIL */
146	ZIO_PRIORITY_ASYNC_READ,	/* prefetch */
147	ZIO_PRIORITY_ASYNC_WRITE,	/* spa_sync() */
148	ZIO_PRIORITY_SCRUB,		/* asynchronous scrub/resilver reads */
149	ZIO_PRIORITY_TRIM,		/* free requests used for TRIM */
150	ZIO_PRIORITY_NUM_QUEUEABLE,
151
152	ZIO_PRIORITY_NOW		/* non-queued I/Os (e.g. ioctl) */
153} zio_priority_t;
154
155#define	ZIO_PIPELINE_CONTINUE		0x100
156#define	ZIO_PIPELINE_STOP		0x101
157
158enum zio_flag {
159	/*
160	 * Flags inherited by gang, ddt, and vdev children,
161	 * and that must be equal for two zios to aggregate
162	 */
163	ZIO_FLAG_DONT_AGGREGATE	= 1 << 0,
164	ZIO_FLAG_IO_REPAIR	= 1 << 1,
165	ZIO_FLAG_SELF_HEAL	= 1 << 2,
166	ZIO_FLAG_RESILVER	= 1 << 3,
167	ZIO_FLAG_SCRUB		= 1 << 4,
168	ZIO_FLAG_SCAN_THREAD	= 1 << 5,
169	ZIO_FLAG_PHYSICAL	= 1 << 6,
170
171#define	ZIO_FLAG_AGG_INHERIT	(ZIO_FLAG_CANFAIL - 1)
172
173	/*
174	 * Flags inherited by ddt, gang, and vdev children.
175	 */
176	ZIO_FLAG_CANFAIL	= 1 << 7,	/* must be first for INHERIT */
177	ZIO_FLAG_SPECULATIVE	= 1 << 8,
178	ZIO_FLAG_CONFIG_WRITER	= 1 << 9,
179	ZIO_FLAG_DONT_RETRY	= 1 << 10,
180	ZIO_FLAG_DONT_CACHE	= 1 << 11,
181	ZIO_FLAG_NODATA		= 1 << 12,
182	ZIO_FLAG_INDUCE_DAMAGE	= 1 << 13,
183
184#define	ZIO_FLAG_DDT_INHERIT	(ZIO_FLAG_IO_RETRY - 1)
185#define	ZIO_FLAG_GANG_INHERIT	(ZIO_FLAG_IO_RETRY - 1)
186
187	/*
188	 * Flags inherited by vdev children.
189	 */
190	ZIO_FLAG_IO_RETRY	= 1 << 14,	/* must be first for INHERIT */
191	ZIO_FLAG_PROBE		= 1 << 15,
192	ZIO_FLAG_TRYHARD	= 1 << 16,
193	ZIO_FLAG_OPTIONAL	= 1 << 17,
194
195#define	ZIO_FLAG_VDEV_INHERIT	(ZIO_FLAG_DONT_QUEUE - 1)
196
197	/*
198	 * Flags not inherited by any children.
199	 */
200	ZIO_FLAG_DONT_QUEUE	= 1 << 18,	/* must be first for INHERIT */
201	ZIO_FLAG_DONT_PROPAGATE	= 1 << 19,
202	ZIO_FLAG_IO_BYPASS	= 1 << 20,
203	ZIO_FLAG_IO_REWRITE	= 1 << 21,
204	ZIO_FLAG_RAW		= 1 << 22,
205	ZIO_FLAG_GANG_CHILD	= 1 << 23,
206	ZIO_FLAG_DDT_CHILD	= 1 << 24,
207	ZIO_FLAG_GODFATHER	= 1 << 25,
208	ZIO_FLAG_NOPWRITE	= 1 << 26,
209	ZIO_FLAG_REEXECUTED	= 1 << 27,
210	ZIO_FLAG_DELEGATED	= 1 << 28,
211};
212
213#define	ZIO_FLAG_MUSTSUCCEED		0
214
215#define	ZIO_DDT_CHILD_FLAGS(zio)				\
216	(((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) |		\
217	ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
218
219#define	ZIO_GANG_CHILD_FLAGS(zio)				\
220	(((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) |		\
221	ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
222
223#define	ZIO_VDEV_CHILD_FLAGS(zio)				\
224	(((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) |		\
225	ZIO_FLAG_CANFAIL)
226
227enum zio_child {
228	ZIO_CHILD_VDEV = 0,
229	ZIO_CHILD_GANG,
230	ZIO_CHILD_DDT,
231	ZIO_CHILD_LOGICAL,
232	ZIO_CHILD_TYPES
233};
234
235enum zio_wait_type {
236	ZIO_WAIT_READY = 0,
237	ZIO_WAIT_DONE,
238	ZIO_WAIT_TYPES
239};
240
241/*
242 * We'll take the number 122 and 123 to indicate checksum errors and
243 * fragmentation. Those doesn't collide with any errno values as they
244 * are greater than ELAST.
245 */
246#define	ECKSUM	122
247#define	EFRAGS	123
248
249typedef void zio_done_func_t(zio_t *zio);
250
251extern 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 *
263 * Note: this structure is called a bookmark because its original purpose
264 * was to remember where to resume a pool-wide traverse.
265 *
266 * Note: this structure is passed between userland and the kernel, and is
267 * stored on disk (by virtue of being incorporated into other on-disk
268 * structures, e.g. dsl_scan_phys_t).
269 */
270typedef struct zbookmark_phys {
271	uint64_t	zb_objset;
272	uint64_t	zb_object;
273	int64_t		zb_level;
274	uint64_t	zb_blkid;
275} zbookmark_phys_t;
276
277#define	SET_BOOKMARK(zb, objset, object, level, blkid)  \
278{                                                       \
279	(zb)->zb_objset = objset;                       \
280	(zb)->zb_object = object;                       \
281	(zb)->zb_level = level;                         \
282	(zb)->zb_blkid = blkid;                         \
283}
284
285#define	ZB_DESTROYED_OBJSET	(-1ULL)
286
287#define	ZB_ROOT_OBJECT		(0ULL)
288#define	ZB_ROOT_LEVEL		(-1LL)
289#define	ZB_ROOT_BLKID		(0ULL)
290
291#define	ZB_ZIL_OBJECT		(0ULL)
292#define	ZB_ZIL_LEVEL		(-2LL)
293
294#define	ZB_IS_ZERO(zb)						\
295	((zb)->zb_objset == 0 && (zb)->zb_object == 0 &&	\
296	(zb)->zb_level == 0 && (zb)->zb_blkid == 0)
297#define	ZB_IS_ROOT(zb)				\
298	((zb)->zb_object == ZB_ROOT_OBJECT &&	\
299	(zb)->zb_level == ZB_ROOT_LEVEL &&	\
300	(zb)->zb_blkid == ZB_ROOT_BLKID)
301
302typedef struct zio_prop {
303	enum zio_checksum	zp_checksum;
304	enum zio_compress	zp_compress;
305	dmu_object_type_t	zp_type;
306	uint8_t			zp_level;
307	uint8_t			zp_copies;
308	boolean_t		zp_dedup;
309	boolean_t		zp_dedup_verify;
310	boolean_t		zp_nopwrite;
311} zio_prop_t;
312
313typedef struct zio_cksum_report zio_cksum_report_t;
314
315typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
316    const void *good_data);
317typedef void zio_cksum_free_f(void *cbdata, size_t size);
318
319struct zio_bad_cksum;				/* defined in zio_checksum.h */
320struct dnode_phys;
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, void *data);
354
355typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
356
357typedef struct zio_transform {
358	void			*zt_orig_data;
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 int 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_link {
378	zio_t		*zl_parent;
379	zio_t		*zl_child;
380	list_node_t	zl_parent_node;
381	list_node_t	zl_child_node;
382} zio_link_t;
383
384/*
385 * Used for TRIM kstat.
386 */
387typedef struct zio_trim_stats {
388	/*
389	 * Number of bytes successfully TRIMmed.
390	 */
391	kstat_named_t bytes;
392
393	/*
394	 * Number of successful TRIM requests.
395	 */
396	kstat_named_t success;
397
398	/*
399	 * Number of TRIM requests that failed because TRIM is not
400	 * supported.
401	 */
402	kstat_named_t unsupported;
403
404	/*
405	 * Number of TRIM requests that failed for other reasons.
406	 */
407	kstat_named_t failed;
408} zio_trim_stats_t;
409
410extern zio_trim_stats_t zio_trim_stats;
411
412#define ZIO_TRIM_STAT_INCR(stat, val) \
413	atomic_add_64(&zio_trim_stats.stat.value.ui64, (val));
414#define ZIO_TRIM_STAT_BUMP(stat) \
415	ZIO_TRIM_STAT_INCR(stat, 1);
416
417struct zio {
418	/* Core information about this I/O */
419	zbookmark_phys_t	io_bookmark;
420	zio_prop_t	io_prop;
421	zio_type_t	io_type;
422	enum zio_child	io_child_type;
423	int		io_cmd;
424	zio_priority_t	io_priority;
425	uint8_t		io_reexecute;
426	uint8_t		io_state[ZIO_WAIT_TYPES];
427	uint64_t	io_txg;
428	spa_t		*io_spa;
429	blkptr_t	*io_bp;
430	blkptr_t	*io_bp_override;
431	blkptr_t	io_bp_copy;
432	list_t		io_parent_list;
433	list_t		io_child_list;
434	zio_link_t	*io_walk_link;
435	zio_t		*io_logical;
436	zio_transform_t *io_transform_stack;
437
438	/* Callback info */
439	zio_done_func_t	*io_ready;
440	zio_done_func_t	*io_physdone;
441	zio_done_func_t	*io_done;
442	void		*io_private;
443	int64_t		io_prev_space_delta;	/* DMU private */
444	blkptr_t	io_bp_orig;
445
446	/* Data represented by this I/O */
447	void		*io_data;
448	void		*io_orig_data;
449	uint64_t	io_size;
450	uint64_t	io_orig_size;
451
452	/* Stuff for the vdev stack */
453	vdev_t		*io_vd;
454	void		*io_vsd;
455	const zio_vsd_ops_t *io_vsd_ops;
456
457	uint64_t	io_offset;
458	hrtime_t	io_timestamp;
459	avl_node_t	io_queue_node;
460
461	/* Internal pipeline state */
462	enum zio_flag	io_flags;
463	enum zio_stage	io_stage;
464	enum zio_stage	io_pipeline;
465	enum zio_flag	io_orig_flags;
466	enum zio_stage	io_orig_stage;
467	enum zio_stage	io_orig_pipeline;
468	int		io_error;
469	int		io_child_error[ZIO_CHILD_TYPES];
470	uint64_t	io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
471	uint64_t	io_child_count;
472	uint64_t	io_phys_children;
473	uint64_t	io_parent_count;
474	uint64_t	*io_stall;
475	zio_t		*io_gang_leader;
476	zio_gang_node_t	*io_gang_tree;
477	void		*io_executor;
478	void		*io_waiter;
479	kmutex_t	io_lock;
480	kcondvar_t	io_cv;
481
482	/* FMA state */
483	zio_cksum_report_t *io_cksum_report;
484	uint64_t	io_ena;
485
486	/* Taskq dispatching state */
487	taskq_ent_t	io_tqent;
488
489	avl_node_t	io_trim_node;
490	list_node_t	io_trim_link;
491};
492
493extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
494    zio_done_func_t *done, void *priv, enum zio_flag flags);
495
496extern zio_t *zio_root(spa_t *spa,
497    zio_done_func_t *done, void *priv, enum zio_flag flags);
498
499extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
500    uint64_t size, zio_done_func_t *done, void *priv,
501    zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
502
503extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
504    void *data, uint64_t size, const zio_prop_t *zp,
505    zio_done_func_t *ready, zio_done_func_t *physdone, zio_done_func_t *done,
506    void *priv,
507    zio_priority_t priority, enum zio_flag flags, const zbookmark_phys_t *zb);
508
509extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
510    void *data, uint64_t size, zio_done_func_t *done, void *priv,
511    zio_priority_t priority, enum zio_flag flags, zbookmark_phys_t *zb);
512
513extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies,
514    boolean_t nopwrite);
515
516extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
517
518extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
519    const blkptr_t *bp,
520    zio_done_func_t *done, void *priv, enum zio_flag flags);
521
522extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
523    uint64_t offset, uint64_t size, zio_done_func_t *done, void *priv,
524    zio_priority_t priority, enum zio_flag flags);
525
526extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
527    uint64_t size, void *data, int checksum,
528    zio_done_func_t *done, void *priv, zio_priority_t priority,
529    enum zio_flag flags, boolean_t labels);
530
531extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
532    uint64_t size, void *data, int checksum,
533    zio_done_func_t *done, void *priv, zio_priority_t priority,
534    enum zio_flag flags, boolean_t labels);
535
536extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
537    const blkptr_t *bp, uint64_t size, enum zio_flag flags);
538
539extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
540    blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
541extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
542extern void zio_flush(zio_t *zio, vdev_t *vd);
543extern zio_t *zio_trim(zio_t *zio, spa_t *spa, vdev_t *vd, uint64_t offset,
544    uint64_t size);
545extern void zio_shrink(zio_t *zio, uint64_t size);
546
547extern int zio_wait(zio_t *zio);
548extern void zio_nowait(zio_t *zio);
549extern void zio_execute(zio_t *zio);
550extern void zio_interrupt(zio_t *zio);
551
552extern zio_t *zio_walk_parents(zio_t *cio);
553extern zio_t *zio_walk_children(zio_t *pio);
554extern zio_t *zio_unique_parent(zio_t *cio);
555extern void zio_add_child(zio_t *pio, zio_t *cio);
556
557extern void *zio_buf_alloc(size_t size);
558extern void zio_buf_free(void *buf, size_t size);
559extern void *zio_data_buf_alloc(size_t size);
560extern void zio_data_buf_free(void *buf, size_t size);
561
562extern void zio_resubmit_stage_async(void *);
563
564extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
565    uint64_t offset, void *data, uint64_t size, int type,
566    zio_priority_t priority, enum zio_flag flags,
567    zio_done_func_t *done, void *priv);
568
569extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
570    void *data, uint64_t size, int type, zio_priority_t priority,
571    enum zio_flag flags, zio_done_func_t *done, void *priv);
572
573extern void zio_vdev_io_bypass(zio_t *zio);
574extern void zio_vdev_io_reissue(zio_t *zio);
575extern void zio_vdev_io_redone(zio_t *zio);
576
577extern void zio_checksum_verified(zio_t *zio);
578extern int zio_worst_error(int e1, int e2);
579
580extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
581    enum zio_checksum parent);
582extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
583    enum zio_checksum child, enum zio_checksum parent);
584extern enum zio_compress zio_compress_select(enum zio_compress child,
585    enum zio_compress parent);
586
587extern void zio_suspend(spa_t *spa, zio_t *zio);
588extern int zio_resume(spa_t *spa);
589extern void zio_resume_wait(spa_t *spa);
590
591/*
592 * Initial setup and teardown.
593 */
594extern void zio_init(void);
595extern void zio_fini(void);
596
597/*
598 * Fault injection
599 */
600struct zinject_record;
601extern uint32_t zio_injection_enabled;
602extern int zio_inject_fault(char *name, int flags, int *id,
603    struct zinject_record *record);
604extern int zio_inject_list_next(int *id, char *name, size_t buflen,
605    struct zinject_record *record);
606extern int zio_clear_fault(int id);
607extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
608extern int zio_handle_fault_injection(zio_t *zio, int error);
609extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
610extern int zio_handle_label_injection(zio_t *zio, int error);
611extern void zio_handle_ignored_writes(zio_t *zio);
612extern uint64_t zio_handle_io_delay(zio_t *zio);
613
614/*
615 * Checksum ereport functions
616 */
617extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
618    uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
619extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
620    const void *good_data, const void *bad_data, boolean_t drop_if_identical);
621
622extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
623extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
624
625/* If we have the good data in hand, this function can be used */
626extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
627    struct zio *zio, uint64_t offset, uint64_t length,
628    const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
629
630/* Called from spa_sync(), but primarily an injection handler */
631extern void spa_handle_ignored_writes(spa_t *spa);
632
633/* zbookmark_phys functions */
634boolean_t zbookmark_is_before(const struct dnode_phys *dnp,
635    const zbookmark_phys_t *zb1, const zbookmark_phys_t *zb2);
636
637#ifdef	__cplusplus
638}
639#endif
640
641#endif	/* _ZIO_H */
642