dmu_tx.h revision 1.1.1.1 
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 2008 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#ifndef	_SYS_DMU_TX_H
27#define	_SYS_DMU_TX_H
28
29#pragma ident	"%Z%%M%	%I%	%E% SMI"
30
31#include <sys/inttypes.h>
32#include <sys/dmu.h>
33#include <sys/txg.h>
34#include <sys/refcount.h>
35
36#ifdef	__cplusplus
37extern "C" {
38#endif
39
40struct dmu_buf_impl;
41struct dmu_tx_hold;
42struct dnode_link;
43struct dsl_pool;
44struct dnode;
45struct dsl_dir;
46
47struct dmu_tx {
48	/*
49	 * No synchronization is needed because a tx can only be handled
50	 * by one thread.
51	 */
52	list_t tx_holds; /* list of dmu_tx_hold_t */
53	objset_t *tx_objset;
54	struct dsl_dir *tx_dir;
55	struct dsl_pool *tx_pool;
56	uint64_t tx_txg;
57	uint64_t tx_lastsnap_txg;
58	uint64_t tx_lasttried_txg;
59	txg_handle_t tx_txgh;
60	void *tx_tempreserve_cookie;
61	struct dmu_tx_hold *tx_needassign_txh;
62	uint8_t tx_anyobj;
63	int tx_err;
64#ifdef ZFS_DEBUG
65	uint64_t tx_space_towrite;
66	uint64_t tx_space_tofree;
67	uint64_t tx_space_tooverwrite;
68	uint64_t tx_space_tounref;
69	refcount_t tx_space_written;
70	refcount_t tx_space_freed;
71#endif
72};
73
74enum dmu_tx_hold_type {
75	THT_NEWOBJECT,
76	THT_WRITE,
77	THT_BONUS,
78	THT_FREE,
79	THT_ZAP,
80	THT_SPACE,
81	THT_NUMTYPES
82};
83
84typedef struct dmu_tx_hold {
85	dmu_tx_t *txh_tx;
86	list_node_t txh_node;
87	struct dnode *txh_dnode;
88	uint64_t txh_space_towrite;
89	uint64_t txh_space_tofree;
90	uint64_t txh_space_tooverwrite;
91	uint64_t txh_space_tounref;
92	uint64_t txh_memory_tohold;
93	uint64_t txh_fudge;
94#ifdef ZFS_DEBUG
95	enum dmu_tx_hold_type txh_type;
96	uint64_t txh_arg1;
97	uint64_t txh_arg2;
98#endif
99} dmu_tx_hold_t;
100
101
102/*
103 * These routines are defined in dmu.h, and are called by the user.
104 */
105dmu_tx_t *dmu_tx_create(objset_t *dd);
106int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how);
107void dmu_tx_commit(dmu_tx_t *tx);
108void dmu_tx_abort(dmu_tx_t *tx);
109uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
110void dmu_tx_wait(dmu_tx_t *tx);
111
112/*
113 * These routines are defined in dmu_spa.h, and are called by the SPA.
114 */
115extern dmu_tx_t *dmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg);
116
117/*
118 * These routines are only called by the DMU.
119 */
120dmu_tx_t *dmu_tx_create_dd(dsl_dir_t *dd);
121int dmu_tx_is_syncing(dmu_tx_t *tx);
122int dmu_tx_private_ok(dmu_tx_t *tx);
123void dmu_tx_add_new_object(dmu_tx_t *tx, objset_t *os, uint64_t object);
124void dmu_tx_willuse_space(dmu_tx_t *tx, int64_t delta);
125void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db);
126int dmu_tx_holds(dmu_tx_t *tx, uint64_t object);
127void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space);
128
129#ifdef ZFS_DEBUG
130#define	DMU_TX_DIRTY_BUF(tx, db)	dmu_tx_dirty_buf(tx, db)
131#else
132#define	DMU_TX_DIRTY_BUF(tx, db)
133#endif
134
135#ifdef	__cplusplus
136}
137#endif
138
139#endif	/* _SYS_DMU_TX_H */
140