]>
Commit | Line | Data |
---|---|---|
34dc7c2f BB |
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 | /* | |
428870ff | 22 | * Copyright 2010 Sun Microsystems, Inc. All rights reserved. |
34dc7c2f BB |
23 | * Use is subject to license terms. |
24 | */ | |
25 | ||
26 | #ifndef _SYS_TXG_H | |
27 | #define _SYS_TXG_H | |
28 | ||
34dc7c2f BB |
29 | #include <sys/spa.h> |
30 | #include <sys/zfs_context.h> | |
31 | ||
32 | #ifdef __cplusplus | |
33 | extern "C" { | |
34 | #endif | |
35 | ||
36 | #define TXG_CONCURRENT_STATES 3 /* open, quiescing, syncing */ | |
37 | #define TXG_SIZE 4 /* next power of 2 */ | |
38 | #define TXG_MASK (TXG_SIZE - 1) /* mask for size */ | |
39 | #define TXG_INITIAL TXG_SIZE /* initial txg */ | |
40 | #define TXG_IDX (txg & TXG_MASK) | |
41 | ||
428870ff BB |
42 | /* Number of txgs worth of frees we defer adding to in-core spacemaps */ |
43 | #define TXG_DEFER_SIZE 2 | |
44 | ||
34dc7c2f BB |
45 | #define TXG_WAIT 1ULL |
46 | #define TXG_NOWAIT 2ULL | |
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); | |
428870ff | 75 | extern void txg_register_callbacks(txg_handle_t *txghp, list_t *tx_callbacks); |
34dc7c2f BB |
76 | |
77 | /* | |
78 | * Delay the caller by the specified number of ticks or until | |
79 | * the txg closes (whichever comes first). This is intended | |
80 | * to be used to throttle writers when the system nears its | |
81 | * capacity. | |
82 | */ | |
83 | extern void txg_delay(struct dsl_pool *dp, uint64_t txg, int ticks); | |
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 | */ | |
b128c09f BB |
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); | |
34dc7c2f BB |
109 | |
110 | /* | |
111 | * Per-txg object lists. | |
112 | */ | |
113 | ||
114 | #define TXG_CLEAN(txg) ((txg) - 1) | |
115 | ||
116 | extern void txg_list_create(txg_list_t *tl, size_t offset); | |
117 | extern void txg_list_destroy(txg_list_t *tl); | |
118 | extern int txg_list_empty(txg_list_t *tl, uint64_t txg); | |
119 | extern int txg_list_add(txg_list_t *tl, void *p, uint64_t txg); | |
428870ff | 120 | extern int txg_list_add_tail(txg_list_t *tl, void *p, uint64_t txg); |
34dc7c2f BB |
121 | extern void *txg_list_remove(txg_list_t *tl, uint64_t txg); |
122 | extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg); | |
123 | extern int txg_list_member(txg_list_t *tl, void *p, uint64_t txg); | |
124 | extern void *txg_list_head(txg_list_t *tl, uint64_t txg); | |
125 | extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg); | |
126 | ||
127 | #ifdef __cplusplus | |
128 | } | |
129 | #endif | |
130 | ||
131 | #endif /* _SYS_TXG_H */ |