aboutsummaryrefslogtreecommitdiffstats
path: root/uts/common/fs/zfs/sys/txg.h
blob: d5c22e41478e98e07ee0d2c1ef02efee115aedce (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/*
 * Copyright (c) 2012, 2017 by Delphix. All rights reserved.
 */

#ifndef _SYS_TXG_H
#define	_SYS_TXG_H

#include <sys/spa.h>
#include <sys/zfs_context.h>

#ifdef	__cplusplus
extern "C" {
#endif

#define	TXG_CONCURRENT_STATES	3	/* open, quiescing, syncing	*/
#define	TXG_SIZE		4		/* next power of 2	*/
#define	TXG_MASK		(TXG_SIZE - 1)	/* mask for size	*/
#define	TXG_INITIAL		TXG_SIZE	/* initial txg 		*/
#define	TXG_IDX			(txg & TXG_MASK)

/* Number of txgs worth of frees we defer adding to in-core spacemaps */
#define	TXG_DEFER_SIZE		2

typedef struct tx_cpu tx_cpu_t;

typedef struct txg_handle {
	tx_cpu_t	*th_cpu;
	uint64_t	th_txg;
} txg_handle_t;

typedef struct txg_node {
	struct txg_node	*tn_next[TXG_SIZE];
	uint8_t		tn_member[TXG_SIZE];
} txg_node_t;

typedef struct txg_list {
	kmutex_t	tl_lock;
	size_t		tl_offset;
	spa_t		*tl_spa;
	txg_node_t	*tl_head[TXG_SIZE];
} txg_list_t;

struct dsl_pool;

extern void txg_init(struct dsl_pool *dp, uint64_t txg);
extern void txg_fini(struct dsl_pool *dp);
extern void txg_sync_start(struct dsl_pool *dp);
extern void txg_sync_stop(struct dsl_pool *dp);
extern uint64_t txg_hold_open(struct dsl_pool *dp, txg_handle_t *txghp);
extern void txg_rele_to_quiesce(txg_handle_t *txghp);
extern void txg_rele_to_sync(txg_handle_t *txghp);
extern void txg_register_callbacks(txg_handle_t *txghp, list_t *tx_callbacks);

extern void txg_delay(struct dsl_pool *dp, uint64_t txg, hrtime_t delta,
    hrtime_t resolution);
extern void txg_kick(struct dsl_pool *dp);

/*
 * Wait until the given transaction group has finished syncing.
 * Try to make this happen as soon as possible (eg. kick off any
 * necessary syncs immediately).  If txg==0, wait for the currently open
 * txg to finish syncing.
 */
extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg);

/*
 * Wait as above. Returns true if the thread was signaled while waiting.
 */
extern boolean_t txg_wait_synced_sig(struct dsl_pool *dp, uint64_t txg);

/*
 * Wait until the given transaction group, or one after it, is
 * the open transaction group.  Try to make this happen as soon
 * as possible (eg. kick off any necessary syncs immediately).
 * If txg == 0, wait for the next open txg.
 */
extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg);

/*
 * Returns TRUE if we are "backed up" waiting for the syncing
 * transaction to complete; otherwise returns FALSE.
 */
extern boolean_t txg_stalled(struct dsl_pool *dp);

/* returns TRUE if someone is waiting for the next txg to sync */
extern boolean_t txg_sync_waiting(struct dsl_pool *dp);

extern void txg_verify(spa_t *spa, uint64_t txg);

/*
 * Per-txg object lists.
 */

#define	TXG_CLEAN(txg)	((txg) - 1)

extern void txg_list_create(txg_list_t *tl, spa_t *spa, size_t offset);
extern void txg_list_destroy(txg_list_t *tl);
extern boolean_t txg_list_empty(txg_list_t *tl, uint64_t txg);
extern boolean_t txg_all_lists_empty(txg_list_t *tl);
extern boolean_t txg_list_add(txg_list_t *tl, void *p, uint64_t txg);
extern boolean_t txg_list_add_tail(txg_list_t *tl, void *p, uint64_t txg);
extern void *txg_list_remove(txg_list_t *tl, uint64_t txg);
extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg);
extern boolean_t txg_list_member(txg_list_t *tl, void *p, uint64_t txg);
extern void *txg_list_head(txg_list_t *tl, uint64_t txg);
extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg);

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_TXG_H */