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 */