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) 2012, 2015 by Delphix. All rights reserved. 27 */ 28 29 #ifndef _SYS_DMU_TX_H 30 #define _SYS_DMU_TX_H 31 32 #include <sys/dmu.h> 33 #include <sys/txg.h> 34 #include <sys/refcount.h> 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 struct dmu_buf_impl; 41 struct dmu_tx_hold; 42 struct dnode_link; 43 struct dsl_pool; 44 struct dnode; 45 struct dsl_dir; 46 47 struct 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 63 /* list of dmu_tx_callback_t on this dmu_tx */ 64 list_t tx_callbacks; 65 66 /* placeholder for syncing context, doesn't need specific holds */ 67 boolean_t tx_anyobj; 68 69 /* has this transaction already been delayed? */ 70 boolean_t tx_waited; 71 72 /* time this transaction was created */ 73 hrtime_t tx_start; 74 75 /* need to wait for sufficient dirty space */ 76 boolean_t tx_wait_dirty; 77 78 int tx_err; 79 #ifdef ZFS_DEBUG 80 uint64_t tx_space_towrite; 81 uint64_t tx_space_tofree; 82 uint64_t tx_space_tooverwrite; 83 uint64_t tx_space_tounref; 84 refcount_t tx_space_written; 85 refcount_t tx_space_freed; 86 #endif 87 }; 88 89 enum dmu_tx_hold_type { 90 THT_NEWOBJECT, 91 THT_WRITE, 92 THT_BONUS, 93 THT_FREE, 94 THT_ZAP, 95 THT_SPACE, 96 THT_SPILL, 97 THT_NUMTYPES 98 }; 99 100 typedef struct dmu_tx_hold { 101 dmu_tx_t *txh_tx; 102 list_node_t txh_node; 103 struct dnode *txh_dnode; 104 refcount_t txh_space_towrite; 105 refcount_t txh_space_tofree; 106 refcount_t txh_space_tooverwrite; 107 refcount_t txh_space_tounref; 108 refcount_t txh_memory_tohold; 109 refcount_t txh_fudge; 110 #ifdef ZFS_DEBUG 111 enum dmu_tx_hold_type txh_type; 112 uint64_t txh_arg1; 113 uint64_t txh_arg2; 114 #endif 115 } dmu_tx_hold_t; 116 117 typedef struct dmu_tx_callback { 118 list_node_t dcb_node; /* linked to tx_callbacks list */ 119 dmu_tx_callback_func_t *dcb_func; /* caller function pointer */ 120 void *dcb_data; /* caller private data */ 121 } dmu_tx_callback_t; 122 123 /* 124 * These routines are defined in dmu.h, and are called by the user. 125 */ 126 dmu_tx_t *dmu_tx_create(objset_t *dd); 127 int dmu_tx_assign(dmu_tx_t *tx, txg_how_t txg_how); 128 void dmu_tx_commit(dmu_tx_t *tx); 129 void dmu_tx_abort(dmu_tx_t *tx); 130 uint64_t dmu_tx_get_txg(dmu_tx_t *tx); 131 struct dsl_pool *dmu_tx_pool(dmu_tx_t *tx); 132 void dmu_tx_wait(dmu_tx_t *tx); 133 134 void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func, 135 void *dcb_data); 136 void dmu_tx_do_callbacks(list_t *cb_list, int error); 137 138 /* 139 * These routines are defined in dmu_spa.h, and are called by the SPA. 140 */ 141 extern dmu_tx_t *dmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg); 142 143 /* 144 * These routines are only called by the DMU. 145 */ 146 dmu_tx_t *dmu_tx_create_dd(dsl_dir_t *dd); 147 int dmu_tx_is_syncing(dmu_tx_t *tx); 148 int dmu_tx_private_ok(dmu_tx_t *tx); 149 void dmu_tx_add_new_object(dmu_tx_t *tx, objset_t *os, uint64_t object); 150 void dmu_tx_willuse_space(dmu_tx_t *tx, int64_t delta); 151 void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db); 152 int dmu_tx_holds(dmu_tx_t *tx, uint64_t object); 153 void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space); 154 155 #ifdef ZFS_DEBUG 156 #define DMU_TX_DIRTY_BUF(tx, db) dmu_tx_dirty_buf(tx, db) 157 #else 158 #define DMU_TX_DIRTY_BUF(tx, db) 159 #endif 160 161 #ifdef __cplusplus 162 } 163 #endif 164 165 #endif /* _SYS_DMU_TX_H */ 166