xref: /titanic_41/usr/src/uts/common/fs/zfs/sys/dmu_tx.h (revision 0b42f15ac52b077791d4ba079e8c163c592c3fda)
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) 2013 by Delphix. All rights reserved.
27  */
28 
29 #ifndef	_SYS_DMU_TX_H
30 #define	_SYS_DMU_TX_H
31 
32 #include <sys/inttypes.h>
33 #include <sys/dmu.h>
34 #include <sys/txg.h>
35 #include <sys/refcount.h>
36 
37 #ifdef	__cplusplus
38 extern "C" {
39 #endif
40 
41 struct dmu_buf_impl;
42 struct dmu_tx_hold;
43 struct dnode_link;
44 struct dsl_pool;
45 struct dnode;
46 struct dsl_dir;
47 
48 struct dmu_tx {
49 	/*
50 	 * No synchronization is needed because a tx can only be handled
51 	 * by one thread.
52 	 */
53 	list_t tx_holds; /* list of dmu_tx_hold_t */
54 	objset_t *tx_objset;
55 	struct dsl_dir *tx_dir;
56 	struct dsl_pool *tx_pool;
57 	uint64_t tx_txg;
58 	uint64_t tx_lastsnap_txg;
59 	uint64_t tx_lasttried_txg;
60 	txg_handle_t tx_txgh;
61 	void *tx_tempreserve_cookie;
62 	struct dmu_tx_hold *tx_needassign_txh;
63 
64 	/* list of dmu_tx_callback_t on this dmu_tx */
65 	list_t tx_callbacks;
66 
67 	/* placeholder for syncing context, doesn't need specific holds */
68 	boolean_t tx_anyobj;
69 
70 	/* has this transaction already been delayed? */
71 	boolean_t tx_waited;
72 
73 	/* time this transaction was created */
74 	hrtime_t tx_start;
75 
76 	/* need to wait for sufficient dirty space */
77 	boolean_t tx_wait_dirty;
78 
79 	int tx_err;
80 #ifdef ZFS_DEBUG
81 	uint64_t tx_space_towrite;
82 	uint64_t tx_space_tofree;
83 	uint64_t tx_space_tooverwrite;
84 	uint64_t tx_space_tounref;
85 	refcount_t tx_space_written;
86 	refcount_t tx_space_freed;
87 #endif
88 };
89 
90 enum dmu_tx_hold_type {
91 	THT_NEWOBJECT,
92 	THT_WRITE,
93 	THT_BONUS,
94 	THT_FREE,
95 	THT_ZAP,
96 	THT_SPACE,
97 	THT_SPILL,
98 	THT_NUMTYPES
99 };
100 
101 typedef struct dmu_tx_hold {
102 	dmu_tx_t *txh_tx;
103 	list_node_t txh_node;
104 	struct dnode *txh_dnode;
105 	uint64_t txh_space_towrite;
106 	uint64_t txh_space_tofree;
107 	uint64_t txh_space_tooverwrite;
108 	uint64_t txh_space_tounref;
109 	uint64_t txh_memory_tohold;
110 	uint64_t txh_fudge;
111 #ifdef ZFS_DEBUG
112 	enum dmu_tx_hold_type txh_type;
113 	uint64_t txh_arg1;
114 	uint64_t txh_arg2;
115 #endif
116 } dmu_tx_hold_t;
117 
118 typedef struct dmu_tx_callback {
119 	list_node_t		dcb_node;    /* linked to tx_callbacks list */
120 	dmu_tx_callback_func_t	*dcb_func;   /* caller function pointer */
121 	void			*dcb_data;   /* caller private data */
122 } dmu_tx_callback_t;
123 
124 /*
125  * These routines are defined in dmu.h, and are called by the user.
126  */
127 dmu_tx_t *dmu_tx_create(objset_t *dd);
128 int dmu_tx_assign(dmu_tx_t *tx, txg_how_t txg_how);
129 void dmu_tx_commit(dmu_tx_t *tx);
130 void dmu_tx_abort(dmu_tx_t *tx);
131 uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
132 struct dsl_pool *dmu_tx_pool(dmu_tx_t *tx);
133 void dmu_tx_wait(dmu_tx_t *tx);
134 
135 void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func,
136     void *dcb_data);
137 void dmu_tx_do_callbacks(list_t *cb_list, int error);
138 
139 /*
140  * These routines are defined in dmu_spa.h, and are called by the SPA.
141  */
142 extern dmu_tx_t *dmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg);
143 
144 /*
145  * These routines are only called by the DMU.
146  */
147 dmu_tx_t *dmu_tx_create_dd(dsl_dir_t *dd);
148 int dmu_tx_is_syncing(dmu_tx_t *tx);
149 int dmu_tx_private_ok(dmu_tx_t *tx);
150 void dmu_tx_add_new_object(dmu_tx_t *tx, objset_t *os, uint64_t object);
151 void dmu_tx_willuse_space(dmu_tx_t *tx, int64_t delta);
152 void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db);
153 int dmu_tx_holds(dmu_tx_t *tx, uint64_t object);
154 void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space);
155 
156 #ifdef ZFS_DEBUG
157 #define	DMU_TX_DIRTY_BUF(tx, db)	dmu_tx_dirty_buf(tx, db)
158 #else
159 #define	DMU_TX_DIRTY_BUF(tx, db)
160 #endif
161 
162 #ifdef	__cplusplus
163 }
164 #endif
165 
166 #endif	/* _SYS_DMU_TX_H */
167