4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
30 #pragma ident "%Z%%M% %I% %E% SMI"
33 #include <sys/zfs_context.h>
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)
46 #define TXG_NOWAIT 2ULL
48 typedef struct tx_cpu tx_cpu_t;
50 typedef struct txg_handle {
55 typedef struct txg_node {
56 struct txg_node *tn_next[TXG_SIZE];
57 uint8_t tn_member[TXG_SIZE];
60 typedef struct txg_list {
63 txg_node_t *tl_head[TXG_SIZE];
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_suspend(struct dsl_pool *dp);
76 extern void txg_resume(struct dsl_pool *dp);
79 * Wait until the given transaction group has finished syncing.
80 * Try to make this happen as soon as possible (eg. kick off any
81 * necessary syncs immediately). If txg==0, wait for the currently open
82 * txg to finish syncing.
84 extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg);
87 * Wait until the given transaction group, or one after it, is
88 * the open transaction group. Try to make this happen as soon
89 * as possible (eg. kick off any necessary syncs immediately).
90 * If txg == 0, wait for the next open txg.
92 extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg);
95 * Returns TRUE if we are "backed up" waiting for the syncing
96 * transaction to complete; otherwise returns FALSE.
98 extern int txg_stalled(struct dsl_pool *dp);
101 * Per-txg object lists.
104 #define TXG_CLEAN(txg) ((txg) - 1)
106 extern void txg_list_create(txg_list_t *tl, size_t offset);
107 extern void txg_list_destroy(txg_list_t *tl);
108 extern int txg_list_empty(txg_list_t *tl, uint64_t txg);
109 extern int txg_list_add(txg_list_t *tl, void *p, uint64_t txg);
110 extern void *txg_list_remove(txg_list_t *tl, uint64_t txg);
111 extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg);
112 extern int txg_list_member(txg_list_t *tl, void *p, uint64_t txg);
113 extern void *txg_list_head(txg_list_t *tl, uint64_t txg);
114 extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg);
120 #endif /* _SYS_TXG_H */