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