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 https://opensource.org/licenses/CDDL-1.0. 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, 2017 by Delphix. All rights reserved. 27 */ 28 29 #ifndef _SYS_TXG_H 30 #define _SYS_TXG_H 31 32 #include <sys/spa.h> 33 #include <sys/zfs_context.h> 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 #define TXG_CONCURRENT_STATES 3 /* open, quiescing, syncing */ 40 #define TXG_SIZE 4 /* next power of 2 */ 41 #define TXG_MASK (TXG_SIZE - 1) /* mask for size */ 42 #define TXG_INITIAL TXG_SIZE /* initial txg */ 43 #define TXG_IDX (txg & TXG_MASK) 44 #define TXG_UNKNOWN 0 45 46 /* Number of txgs worth of frees we defer adding to in-core spacemaps */ 47 #define TXG_DEFER_SIZE 2 48 49 typedef struct tx_cpu tx_cpu_t; 50 51 typedef struct txg_handle { 52 tx_cpu_t *th_cpu; 53 uint64_t th_txg; 54 } txg_handle_t; 55 56 typedef struct txg_node { 57 struct txg_node *tn_next[TXG_SIZE]; 58 uint8_t tn_member[TXG_SIZE]; 59 } txg_node_t; 60 61 typedef struct txg_list { 62 kmutex_t tl_lock; 63 size_t tl_offset; 64 spa_t *tl_spa; 65 txg_node_t *tl_head[TXG_SIZE]; 66 } txg_list_t; 67 68 struct dsl_pool; 69 70 extern void txg_init(struct dsl_pool *dp, uint64_t txg); 71 extern void txg_fini(struct dsl_pool *dp); 72 extern void txg_sync_start(struct dsl_pool *dp); 73 extern void txg_sync_stop(struct dsl_pool *dp); 74 extern uint64_t txg_hold_open(struct dsl_pool *dp, txg_handle_t *txghp); 75 extern void txg_rele_to_quiesce(txg_handle_t *txghp); 76 extern void txg_rele_to_sync(txg_handle_t *txghp); 77 extern void txg_register_callbacks(txg_handle_t *txghp, list_t *tx_callbacks); 78 79 extern void txg_delay(struct dsl_pool *dp, uint64_t txg, hrtime_t delta, 80 hrtime_t resolution); 81 extern void txg_kick(struct dsl_pool *dp, uint64_t txg); 82 83 /* 84 * Wait until the given transaction group has finished syncing. 85 * Try to make this happen as soon as possible (eg. kick off any 86 * necessary syncs immediately). If txg==0, wait for the currently open 87 * txg to finish syncing. 88 */ 89 extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg); 90 91 /* 92 * Wait as above. Returns true if the thread was signaled while waiting. 93 */ 94 extern boolean_t txg_wait_synced_sig(struct dsl_pool *dp, uint64_t txg); 95 96 /* 97 * Wait until the given transaction group, or one after it, is 98 * the open transaction group. Try to make this happen as soon 99 * as possible (eg. kick off any necessary syncs immediately) when 100 * should_quiesce is set. If txg == 0, wait for the next open txg. 101 */ 102 extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg, 103 boolean_t should_quiesce); 104 105 /* 106 * Returns TRUE if we are "backed up" waiting for the syncing 107 * transaction to complete; otherwise returns FALSE. 108 */ 109 extern boolean_t txg_stalled(struct dsl_pool *dp); 110 111 /* returns TRUE if someone is waiting for the next txg to sync */ 112 extern boolean_t txg_sync_waiting(struct dsl_pool *dp); 113 114 extern void txg_verify(spa_t *spa, uint64_t txg); 115 116 /* 117 * Wait for pending commit callbacks of already-synced transactions to finish 118 * processing. 119 */ 120 extern void txg_wait_callbacks(struct dsl_pool *dp); 121 122 /* 123 * Per-txg object lists. 124 */ 125 126 #define TXG_CLEAN(txg) ((txg) - 1) 127 128 extern void txg_list_create(txg_list_t *tl, spa_t *spa, size_t offset); 129 extern void txg_list_destroy(txg_list_t *tl); 130 extern boolean_t txg_list_empty(txg_list_t *tl, uint64_t txg); 131 extern boolean_t txg_all_lists_empty(txg_list_t *tl); 132 extern boolean_t txg_list_add(txg_list_t *tl, void *p, uint64_t txg); 133 extern boolean_t txg_list_add_tail(txg_list_t *tl, void *p, uint64_t txg); 134 extern void *txg_list_remove(txg_list_t *tl, uint64_t txg); 135 extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg); 136 extern boolean_t txg_list_member(txg_list_t *tl, void *p, uint64_t txg); 137 extern void *txg_list_head(txg_list_t *tl, uint64_t txg); 138 extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg); 139 140 /* Global tuning */ 141 extern uint_t zfs_txg_timeout; 142 143 144 #ifdef ZFS_DEBUG 145 #define TXG_VERIFY(spa, txg) txg_verify(spa, txg) 146 #else 147 #define TXG_VERIFY(spa, txg) 148 #endif 149 150 #ifdef __cplusplus 151 } 152 #endif 153 154 #endif /* _SYS_TXG_H */ 155