FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/txg.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    /*
     * Copyright (c) 2012, 2017 by Delphix. All rights reserved.
     */
    
    #ifndef _SYS_TXG_H
    #define _SYS_TXG_H
    
    #include <sys/spa.h>
    #include <sys/zfs_context.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    #define TXG_CONCURRENT_STATES   3       /* open, quiescing, syncing     */
    #define TXG_SIZE                4               /* next power of 2      */
    #define TXG_MASK                (TXG_SIZE - 1)  /* mask for size        */
    #define TXG_INITIAL             TXG_SIZE        /* initial txg          */
    #define TXG_IDX                 (txg & TXG_MASK)
    #define TXG_UNKNOWN             0
    
    /* Number of txgs worth of frees we defer adding to in-core spacemaps */
    #define TXG_DEFER_SIZE          2
    
    typedef struct tx_cpu tx_cpu_t;
    
    typedef struct txg_handle {
            tx_cpu_t        *th_cpu;
            uint64_t        th_txg;
    } txg_handle_t;
    
    typedef struct txg_node {
            struct txg_node *tn_next[TXG_SIZE];
            uint8_t         tn_member[TXG_SIZE];
    } txg_node_t;
    
    typedef struct txg_list {
            kmutex_t        tl_lock;
            size_t          tl_offset;
            spa_t           *tl_spa;
            txg_node_t      *tl_head[TXG_SIZE];
    } txg_list_t;
    
    struct dsl_pool;
    
    extern void txg_init(struct dsl_pool *dp, uint64_t txg);
    extern void txg_fini(struct dsl_pool *dp);
    extern void txg_sync_start(struct dsl_pool *dp);
    extern void txg_sync_stop(struct dsl_pool *dp);
    extern uint64_t txg_hold_open(struct dsl_pool *dp, txg_handle_t *txghp);
    extern void txg_rele_to_quiesce(txg_handle_t *txghp);
    extern void txg_rele_to_sync(txg_handle_t *txghp);
    extern void txg_register_callbacks(txg_handle_t *txghp, list_t *tx_callbacks);
    
    extern void txg_delay(struct dsl_pool *dp, uint64_t txg, hrtime_t delta,
        hrtime_t resolution);
    extern void txg_kick(struct dsl_pool *dp, uint64_t txg);
    
    /*
     * Wait until the given transaction group has finished syncing.
     * Try to make this happen as soon as possible (eg. kick off any
     * necessary syncs immediately).  If txg==0, wait for the currently open
     * txg to finish syncing.
     */
    extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg);
    
    /*
     * Wait as above. Returns true if the thread was signaled while waiting.
     */
    extern boolean_t txg_wait_synced_sig(struct dsl_pool *dp, uint64_t txg);
    
    /*
     * Wait until the given transaction group, or one after it, is
     * the open transaction group.  Try to make this happen as soon
     * as possible (eg. kick off any necessary syncs immediately) when
    * should_quiesce is set.  If txg == 0, wait for the next open txg.
    */
   extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg,
       boolean_t should_quiesce);
   
   /*
    * Returns TRUE if we are "backed up" waiting for the syncing
    * transaction to complete; otherwise returns FALSE.
    */
   extern boolean_t txg_stalled(struct dsl_pool *dp);
   
   /* returns TRUE if someone is waiting for the next txg to sync */
   extern boolean_t txg_sync_waiting(struct dsl_pool *dp);
   
   extern void txg_verify(spa_t *spa, uint64_t txg);
   
   /*
    * Wait for pending commit callbacks of already-synced transactions to finish
    * processing.
    */
   extern void txg_wait_callbacks(struct dsl_pool *dp);
   
   /*
    * Per-txg object lists.
    */
   
   #define TXG_CLEAN(txg)  ((txg) - 1)
   
   extern void txg_list_create(txg_list_t *tl, spa_t *spa, size_t offset);
   extern void txg_list_destroy(txg_list_t *tl);
   extern boolean_t txg_list_empty(txg_list_t *tl, uint64_t txg);
   extern boolean_t txg_all_lists_empty(txg_list_t *tl);
   extern boolean_t txg_list_add(txg_list_t *tl, void *p, uint64_t txg);
   extern boolean_t txg_list_add_tail(txg_list_t *tl, void *p, uint64_t txg);
   extern void *txg_list_remove(txg_list_t *tl, uint64_t txg);
   extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg);
   extern boolean_t txg_list_member(txg_list_t *tl, void *p, uint64_t txg);
   extern void *txg_list_head(txg_list_t *tl, uint64_t txg);
   extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg);
   
   /* Global tuning */
   extern uint_t zfs_txg_timeout;
   
   
   #ifdef ZFS_DEBUG
   #define TXG_VERIFY(spa, txg)            txg_verify(spa, txg)
   #else
   #define TXG_VERIFY(spa, txg)
   #endif
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif  /* _SYS_TXG_H */

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