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 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25 /*
26 * Copyright 2016 Nexenta Systems, Inc. All rights reserved.
27 * Copyright (c) 2012, 2017 by Delphix. All rights reserved.
28 */
29
30 #ifndef _SYS_TXG_H
31 #define _SYS_TXG_H
32
33 #include <sys/spa.h>
34 #include <sys/zfs_context.h>
35
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39
40 #define TXG_CONCURRENT_STATES 3 /* open, quiescing, syncing */
41 #define TXG_SIZE 4 /* next power of 2 */
42 #define TXG_MASK (TXG_SIZE - 1) /* mask for size */
43 #define TXG_INITIAL TXG_SIZE /* initial txg */
44 #define TXG_IDX (txg & TXG_MASK)
45
46 /* Number of txgs worth of frees we defer adding to in-core spacemaps */
47 #define TXG_DEFER_SIZE 2
48
49 typedef struct tx_cpu tx_cpu_t;
50
51 typedef struct txg_handle {
52 tx_cpu_t *th_cpu;
53 uint64_t th_txg;
54 } txg_handle_t;
55
56 typedef struct txg_node {
57 struct txg_node *tn_next[TXG_SIZE];
58 uint8_t tn_member[TXG_SIZE];
59 } txg_node_t;
60
61 typedef struct txg_list {
62 kmutex_t tl_lock;
63 size_t tl_offset;
64 spa_t *tl_spa;
65 txg_node_t *tl_head[TXG_SIZE];
66 } txg_list_t;
67
68 struct dsl_pool;
69
70 extern void txg_init(struct dsl_pool *dp, uint64_t txg);
71 extern void txg_fini(struct dsl_pool *dp);
72 extern void txg_sync_start(struct dsl_pool *dp);
73 extern void txg_sync_stop(struct dsl_pool *dp);
74 extern uint64_t txg_hold_open(struct dsl_pool *dp, txg_handle_t *txghp);
75 extern void txg_rele_to_quiesce(txg_handle_t *txghp);
76 extern void txg_rele_to_sync(txg_handle_t *txghp);
77 extern void txg_register_callbacks(txg_handle_t *txghp, list_t *tx_callbacks);
78 extern void txg_register_callbacks_sync(struct dsl_pool *dp,
79 uint64_t txg, list_t *tx_callbacks);
80
81 extern void txg_delay(struct dsl_pool *dp, uint64_t txg, hrtime_t delta,
82 hrtime_t resolution);
83 extern void txg_kick(struct dsl_pool *dp);
84
85 /*
86 * Wait until the given transaction group has finished syncing.
87 * Try to make this happen as soon as possible (eg. kick off any
88 * necessary syncs immediately). If txg==0, wait for the currently open
89 * txg to finish syncing.
90 */
91 extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg);
92
93 /*
94 * Wait until the given transaction group, or one after it, is
95 * the open transaction group. Try to make this happen as soon
96 * as possible (eg. kick off any necessary syncs immediately).
97 * If txg == 0, wait for the next open txg.
98 */
99 extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg);
100
101 /*
102 * Returns TRUE if we are "backed up" waiting for the syncing
103 * transaction to complete; otherwise returns FALSE.
104 */
105 extern boolean_t txg_stalled(struct dsl_pool *dp);
106
107 /* returns TRUE if someone is waiting for the next txg to sync */
108 extern boolean_t txg_sync_waiting(struct dsl_pool *dp);
109
110 extern void txg_verify(spa_t *spa, uint64_t txg);
111
112 /*
113 * Per-txg object lists.
114 */
115
116 #define TXG_CLEAN(txg) ((txg) - 1)
117
118 extern void txg_list_create(txg_list_t *tl, spa_t *spa, size_t offset);
119 extern void txg_list_destroy(txg_list_t *tl);
120 extern boolean_t txg_list_empty(txg_list_t *tl, uint64_t txg);
121 extern boolean_t txg_all_lists_empty(txg_list_t *tl);
122 extern boolean_t txg_list_add(txg_list_t *tl, void *p, uint64_t txg);
123 extern boolean_t txg_list_add_tail(txg_list_t *tl, void *p, uint64_t txg);
124 extern void *txg_list_remove(txg_list_t *tl, uint64_t txg);
125 extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg);
126 extern boolean_t txg_list_member(txg_list_t *tl, void *p, uint64_t txg);
127 extern void *txg_list_head(txg_list_t *tl, uint64_t txg);
128 extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg);
129
130 #ifdef __cplusplus
131 }
132 #endif
133
134 #endif /* _SYS_TXG_H */