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_TXG_H 28 #define _SYS_TXG_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 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 45 #define TXG_WAIT 1ULL 46 #define TXG_NOWAIT 2ULL 47 48 typedef struct tx_cpu tx_cpu_t; 49 50 typedef struct txg_handle { 51 tx_cpu_t *th_cpu; 52 uint64_t th_txg; 53 } txg_handle_t; 54 55 typedef struct txg_node { 56 struct txg_node *tn_next[TXG_SIZE]; 57 uint8_t tn_member[TXG_SIZE]; 58 } txg_node_t; 59 60 typedef struct txg_list { 61 kmutex_t tl_lock; 62 size_t tl_offset; 63 txg_node_t *tl_head[TXG_SIZE]; 64 } txg_list_t; 65 66 struct dsl_pool; 67 68 extern void txg_init(struct dsl_pool *dp, uint64_t txg); 69 extern void txg_fini(struct dsl_pool *dp); 70 extern void txg_sync_start(struct dsl_pool *dp); 71 extern void txg_sync_stop(struct dsl_pool *dp); 72 extern uint64_t txg_hold_open(struct dsl_pool *dp, txg_handle_t *txghp); 73 extern void txg_rele_to_quiesce(txg_handle_t *txghp); 74 extern void txg_rele_to_sync(txg_handle_t *txghp); 75 extern void txg_suspend(struct dsl_pool *dp); 76 extern void txg_resume(struct dsl_pool *dp); 77 78 /* 79 * Wait until the given transaction group has finished syncing. 80 * Try to make this happen as soon as possible (eg. kick off any 81 * necessary syncs immediately). If txg==0, wait for the currently open 82 * txg to finish syncing. 83 */ 84 extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg); 85 86 /* 87 * Wait until the given transaction group, or one after it, is 88 * the open transaction group. Try to make this happen as soon 89 * as possible (eg. kick off any necessary syncs immediately). 90 * If txg == 0, wait for the next open txg. 91 */ 92 extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg); 93 94 /* 95 * Returns TRUE if we are "backed up" waiting for the syncing 96 * transaction to complete; otherwise returns FALSE. 97 */ 98 extern int txg_stalled(struct dsl_pool *dp); 99 100 /* 101 * Per-txg object lists. 102 */ 103 104 #define TXG_CLEAN(txg) ((txg) - 1) 105 106 extern void txg_list_create(txg_list_t *tl, size_t offset); 107 extern void txg_list_destroy(txg_list_t *tl); 108 extern int txg_list_empty(txg_list_t *tl, uint64_t txg); 109 extern int txg_list_add(txg_list_t *tl, void *p, uint64_t txg); 110 extern void *txg_list_remove(txg_list_t *tl, uint64_t txg); 111 extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg); 112 extern int txg_list_member(txg_list_t *tl, void *p, uint64_t txg); 113 extern void *txg_list_head(txg_list_t *tl, uint64_t txg); 114 extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg); 115 116 #ifdef __cplusplus 117 } 118 #endif 119 120 #endif /* _SYS_TXG_H */ 121