1 // SPDX-License-Identifier: CDDL-1.0 2 /* 3 * CDDL HEADER START 4 * 5 * The contents of this file are subject to the terms of the 6 * Common Development and Distribution License (the "License"). 7 * You may not use this file except in compliance with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or https://opensource.org/licenses/CDDL-1.0. 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 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 /* 27 * Copyright (c) 2012, 2017 by Delphix. All rights reserved. 28 */ 29 30 #ifndef _SYS_TXG_H 31 #define _SYS_TXG_H 32 33 #include <sys/spa.h> 34 #include <sys/zfs_context.h> 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 #define TXG_CONCURRENT_STATES 3 /* open, quiescing, syncing */ 41 #define TXG_SIZE 4 /* next power of 2 */ 42 #define TXG_MASK (TXG_SIZE - 1) /* mask for size */ 43 #define TXG_INITIAL TXG_SIZE /* initial txg */ 44 #define TXG_IDX (txg & TXG_MASK) 45 #define TXG_UNKNOWN 0 46 47 /* Number of txgs worth of frees we defer adding to in-core spacemaps */ 48 #define TXG_DEFER_SIZE 2 49 50 typedef struct tx_cpu tx_cpu_t; 51 52 typedef struct txg_handle { 53 tx_cpu_t *th_cpu; 54 uint64_t th_txg; 55 } txg_handle_t; 56 57 typedef struct txg_node { 58 struct txg_node *tn_next[TXG_SIZE]; 59 uint8_t tn_member[TXG_SIZE]; 60 } txg_node_t; 61 62 typedef struct txg_list { 63 kmutex_t tl_lock; 64 size_t tl_offset; 65 spa_t *tl_spa; 66 txg_node_t *tl_head[TXG_SIZE]; 67 } txg_list_t; 68 69 struct dsl_pool; 70 71 extern void txg_init(struct dsl_pool *dp, uint64_t txg); 72 extern void txg_fini(struct dsl_pool *dp); 73 extern void txg_sync_start(struct dsl_pool *dp); 74 extern void txg_sync_stop(struct dsl_pool *dp); 75 extern uint64_t txg_hold_open(struct dsl_pool *dp, txg_handle_t *txghp); 76 extern void txg_rele_to_quiesce(txg_handle_t *txghp); 77 extern void txg_rele_to_sync(txg_handle_t *txghp); 78 extern void txg_register_callbacks(txg_handle_t *txghp, list_t *tx_callbacks); 79 80 extern void txg_delay(struct dsl_pool *dp, uint64_t txg, hrtime_t delta, 81 hrtime_t resolution); 82 extern void txg_kick(struct dsl_pool *dp, uint64_t txg); 83 84 /* 85 * Wait until the given transaction group has finished syncing. 86 * Try to make this happen as soon as possible (eg. kick off any 87 * necessary syncs immediately). If txg==0, wait for the currently open 88 * txg to finish syncing. 89 */ 90 extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg); 91 92 /* 93 * Wait as above. Returns true if the thread was signaled while waiting. 94 */ 95 extern boolean_t txg_wait_synced_sig(struct dsl_pool *dp, uint64_t txg); 96 97 /* 98 * Wait until the given transaction group, or one after it, is 99 * the open transaction group. Try to make this happen as soon 100 * as possible (eg. kick off any necessary syncs immediately) when 101 * should_quiesce is set. If txg == 0, wait for the next open txg. 102 */ 103 extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg, 104 boolean_t should_quiesce); 105 106 /* 107 * Returns TRUE if we are "backed up" waiting for the syncing 108 * transaction to complete; otherwise returns FALSE. 109 */ 110 extern boolean_t txg_stalled(struct dsl_pool *dp); 111 112 /* returns TRUE if someone is waiting for the next txg to sync */ 113 extern boolean_t txg_sync_waiting(struct dsl_pool *dp); 114 115 extern void txg_verify(spa_t *spa, uint64_t txg); 116 117 /* 118 * Wait for pending commit callbacks of already-synced transactions to finish 119 * processing. 120 */ 121 extern void txg_wait_callbacks(struct dsl_pool *dp); 122 123 /* 124 * Per-txg object lists. 125 */ 126 127 #define TXG_CLEAN(txg) ((txg) - 1) 128 129 extern void txg_list_create(txg_list_t *tl, spa_t *spa, size_t offset); 130 extern void txg_list_destroy(txg_list_t *tl); 131 extern boolean_t txg_list_empty(txg_list_t *tl, uint64_t txg); 132 extern boolean_t txg_all_lists_empty(txg_list_t *tl); 133 extern boolean_t txg_list_add(txg_list_t *tl, void *p, uint64_t txg); 134 extern boolean_t txg_list_add_tail(txg_list_t *tl, void *p, uint64_t txg); 135 extern void *txg_list_remove(txg_list_t *tl, uint64_t txg); 136 extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg); 137 extern boolean_t txg_list_member(txg_list_t *tl, void *p, uint64_t txg); 138 extern void *txg_list_head(txg_list_t *tl, uint64_t txg); 139 extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg); 140 141 /* Global tuning */ 142 extern uint_t zfs_txg_timeout; 143 144 145 #ifdef ZFS_DEBUG 146 #define TXG_VERIFY(spa, txg) txg_verify(spa, txg) 147 #else 148 #define TXG_VERIFY(spa, txg) 149 #endif 150 151 #ifdef __cplusplus 152 } 153 #endif 154 155 #endif /* _SYS_TXG_H */ 156