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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_DMU_TX_H 28 #define _SYS_DMU_TX_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 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 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 txg_handle_t tx_txgh; 58 uint64_t tx_space_towrite; 59 refcount_t tx_space_written; 60 uint64_t tx_space_tofree; 61 refcount_t tx_space_freed; 62 uint64_t tx_space_tooverwrite; 63 void *tx_tempreserve_cookie; 64 uint8_t tx_anyobj; 65 uint8_t tx_privateobj; 66 #ifdef ZFS_DEBUG 67 char *tx_debug_buf; 68 int tx_debug_len; 69 #endif 70 }; 71 72 enum dmu_tx_hold_type { 73 THT_NEWOBJECT, 74 THT_WRITE, 75 THT_BONUS, 76 THT_FREE, 77 THT_ZAP, 78 THT_SPACE, 79 THT_NUMTYPES 80 }; 81 82 typedef void (*dmu_tx_hold_func_t)(dmu_tx_t *tx, struct dnode *dn, 83 uint64_t arg1, uint64_t arg2); 84 85 86 typedef struct dmu_tx_hold { 87 list_node_t dth_node; 88 struct dnode *dth_dnode; 89 enum dmu_tx_hold_type dth_type; 90 dmu_tx_hold_func_t dth_func; 91 uint64_t dth_arg1; 92 uint64_t dth_arg2; 93 /* XXX track what the actual estimates were for this hold */ 94 } dmu_tx_hold_t; 95 96 97 /* 98 * These routines are defined in dmu.h, and are called by the user. 99 */ 100 dmu_tx_t *dmu_tx_create(objset_t *dd); 101 int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how); 102 void dmu_tx_commit(dmu_tx_t *tx); 103 void dmu_tx_abort(dmu_tx_t *tx); 104 uint64_t dmu_tx_get_txg(dmu_tx_t *tx); 105 106 /* 107 * These routines are defined in dmu_spa.h, and are called by the SPA. 108 */ 109 extern dmu_tx_t *dmu_tx_create_assigned(struct dsl_pool *dp, uint64_t txg); 110 111 /* 112 * These routines are only called by the DMU. 113 */ 114 dmu_tx_t *dmu_tx_create_ds(dsl_dir_t *dd); 115 int dmu_tx_is_syncing(dmu_tx_t *tx); 116 int dmu_tx_private_ok(dmu_tx_t *tx); 117 void dmu_tx_add_new_object(dmu_tx_t *tx, objset_t *os, uint64_t object); 118 void dmu_tx_willuse_space(dmu_tx_t *tx, int64_t delta); 119 void dmu_tx_dirty_buf(dmu_tx_t *tx, struct dmu_buf_impl *db); 120 int dmu_tx_holds(dmu_tx_t *tx, uint64_t object); 121 void dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space); 122 123 #ifdef ZFS_DEBUG 124 125 extern int dmu_use_tx_debug_bufs; 126 127 #define dprintf_tx(tx, fmt, ...) \ 128 if (dmu_use_tx_debug_bufs) \ 129 do { \ 130 char *__bufp; \ 131 int __len; \ 132 if (tx->tx_debug_buf == NULL) { \ 133 __bufp = kmem_zalloc(4096, KM_SLEEP); \ 134 tx->tx_debug_buf = __bufp; \ 135 tx->tx_debug_len = __len = 4096; \ 136 } else { \ 137 __len = tx->tx_debug_len; \ 138 __bufp = &tx->tx_debug_buf[4096-__len]; \ 139 } \ 140 tx->tx_debug_len -= snprintf(__bufp, __len, fmt, __VA_ARGS__); \ 141 _NOTE(CONSTCOND) } while (0); \ 142 else dprintf(fmt, __VA_ARGS__) 143 144 #define DMU_TX_DIRTY_BUF(tx, db) dmu_tx_dirty_buf(tx, db) 145 146 #else 147 148 #define dprintf_tx(tx, fmt, ...) 149 #define DMU_TX_DIRTY_BUF(tx, db) 150 151 #endif 152 153 #ifdef __cplusplus 154 } 155 #endif 156 157 #endif /* _SYS_DMU_TX_H */ 158