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