FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/spa_log_spacemap.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 (c) 2018, 2019 by Delphix. All rights reserved.
     */
    
    #ifndef _SYS_SPA_LOG_SPACEMAP_H
    #define _SYS_SPA_LOG_SPACEMAP_H
    
    #include <sys/avl.h>
    
    typedef struct log_summary_entry {
            uint64_t lse_start;     /* start TXG */
            uint64_t lse_end;       /* last TXG */
            uint64_t lse_txgcount;  /* # of TXGs */
            uint64_t lse_mscount;   /* # of metaslabs needed to be flushed */
            uint64_t lse_msdcount;  /* # of dirty metaslabs needed to be flushed */
            uint64_t lse_blkcount;  /* blocks held by this entry  */
            list_node_t lse_node;
    } log_summary_entry_t;
    
    typedef struct spa_unflushed_stats  {
            /* used for memory heuristic */
            uint64_t sus_memused;   /* current memory used for unflushed trees */
    
            /* used for block heuristic */
            uint64_t sus_blocklimit;        /* max # of log blocks allowed */
            uint64_t sus_nblocks;   /* # of blocks in log space maps currently */
    } spa_unflushed_stats_t;
    
    typedef struct spa_log_sm {
            uint64_t sls_sm_obj;    /* space map object ID */
            uint64_t sls_txg;       /* txg logged on the space map */
            uint64_t sls_nblocks;   /* number of blocks in this log */
            uint64_t sls_mscount;   /* # of metaslabs flushed in the log's txg */
            avl_node_t sls_node;    /* node in spa_sm_logs_by_txg */
            space_map_t *sls_sm;    /* space map pointer, if open */
    } spa_log_sm_t;
    
    int spa_ld_log_spacemaps(spa_t *);
    
    void spa_generate_syncing_log_sm(spa_t *, dmu_tx_t *);
    void spa_flush_metaslabs(spa_t *, dmu_tx_t *);
    void spa_sync_close_syncing_log_sm(spa_t *);
    
    void spa_cleanup_old_sm_logs(spa_t *, dmu_tx_t *);
    
    uint64_t spa_log_sm_blocklimit(spa_t *);
    void spa_log_sm_set_blocklimit(spa_t *);
    uint64_t spa_log_sm_nblocks(spa_t *);
    uint64_t spa_log_sm_memused(spa_t *);
    
    void spa_log_sm_decrement_mscount(spa_t *, uint64_t);
    void spa_log_sm_increment_current_mscount(spa_t *);
    
    void spa_log_summary_add_flushed_metaslab(spa_t *, boolean_t);
    void spa_log_summary_dirty_flushed_metaslab(spa_t *, uint64_t);
    void spa_log_summary_decrement_mscount(spa_t *, uint64_t, boolean_t);
    void spa_log_summary_decrement_blkcount(spa_t *, uint64_t);
    
    boolean_t spa_flush_all_logs_requested(spa_t *);
    
    extern int zfs_keep_log_spacemaps_at_export;
    
    #endif /* _SYS_SPA_LOG_SPACEMAP_H */

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