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.
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.
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]
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
29 #pragma ident "%Z%%M% %I% %E% SMI"
32 #include <sys/zfs_context.h>
38 #define TXG_CONCURRENT_STATES 3 /* open, quiescing, syncing */
39 #define TXG_SIZE 4 /* next power of 2 */
40 #define TXG_MASK (TXG_SIZE - 1) /* mask for size */
41 #define TXG_INITIAL TXG_SIZE /* initial txg */
42 #define TXG_IDX (txg & TXG_MASK)
45 #define TXG_NOWAIT 2ULL
47 typedef struct tx_cpu tx_cpu_t;
49 typedef struct txg_handle {
54 typedef struct txg_node {
55 struct txg_node *tn_next[TXG_SIZE];
56 uint8_t tn_member[TXG_SIZE];
59 typedef struct txg_list {
62 txg_node_t *tl_head[TXG_SIZE];
67 extern void txg_init(struct dsl_pool *dp, uint64_t txg);
68 extern void txg_fini(struct dsl_pool *dp);
69 extern void txg_sync_start(struct dsl_pool *dp);
70 extern void txg_sync_stop(struct dsl_pool *dp);
71 extern uint64_t txg_hold_open(struct dsl_pool *dp, txg_handle_t *txghp);
72 extern void txg_rele_to_quiesce(txg_handle_t *txghp);
73 extern void txg_rele_to_sync(txg_handle_t *txghp);
74 extern void txg_suspend(struct dsl_pool *dp);
75 extern void txg_resume(struct dsl_pool *dp);
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
83 extern void txg_delay(struct dsl_pool *dp, uint64_t txg, int ticks);
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.
91 extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg);
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.
99 extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg);
102 * Returns TRUE if we are "backed up" waiting for the syncing
103 * transaction to complete; otherwise returns FALSE.
105 extern boolean_t txg_stalled(struct dsl_pool *dp);
107 /* returns TRUE if someone is waiting for the next txg to sync */
108 extern boolean_t txg_sync_waiting(struct dsl_pool *dp);
111 * Per-txg object lists.
114 #define TXG_CLEAN(txg) ((txg) - 1)
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);
120 extern void *txg_list_remove(txg_list_t *tl, uint64_t txg);
121 extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg);
122 extern int txg_list_member(txg_list_t *tl, void *p, uint64_t txg);
123 extern void *txg_list_head(txg_list_t *tl, uint64_t txg);
124 extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg);
130 #endif /* _SYS_TXG_H */