dmu_zfetch.h

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    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 2009 Sun Microsystems, Inc.  All rights reserved.
   23  * Use is subject to license terms.
   24  */
   25 
   26 /*
   27  * Copyright (c) 2014, 2017 by Delphix. All rights reserved.
   28  */
   29 
   30 #ifndef _DMU_ZFETCH_H
   31 #define _DMU_ZFETCH_H
   32 
   33 #include <sys/zfs_context.h>
   34 
   35 #ifdef  __cplusplus
   36 extern "C" {
   37 #endif
   38 
   39 extern uint64_t zfetch_array_rd_sz;
   40 
   41 struct dnode;                           /* so we can reference dnode */
   42 
   43 typedef struct zfetch {
   44         kmutex_t        zf_lock;        /* protects zfetch structure */
   45         list_t          zf_stream;      /* list of zstream_t's */
   46         struct dnode    *zf_dnode;      /* dnode that owns this zfetch */
   47         int             zf_numstreams;  /* number of zstream_t's */
   48 } zfetch_t;
   49 
   50 typedef struct zstream {
   51         uint64_t        zs_blkid;       /* expect next access at this blkid */
   52         unsigned int    zs_pf_dist;     /* data prefetch distance in bytes */
   53         unsigned int    zs_ipf_dist;    /* L1 prefetch distance in bytes */
   54         uint64_t        zs_pf_start;    /* first data block to prefetch */
   55         uint64_t        zs_pf_end;      /* data block to prefetch up to */
   56         uint64_t        zs_ipf_start;   /* first data block to prefetch L1 */
   57         uint64_t        zs_ipf_end;     /* data block to prefetch L1 up to */
   58 
   59         list_node_t     zs_node;        /* link for zf_stream */
   60         hrtime_t        zs_atime;       /* time last prefetch issued */
   61         zfetch_t        *zs_fetch;      /* parent fetch */
   62         boolean_t       zs_missed;      /* stream saw cache misses */
   63         boolean_t       zs_more;        /* need more distant prefetch */
   64         zfs_refcount_t  zs_callers;     /* number of pending callers */
   65         /*
   66          * Number of stream references: dnode, callers and pending blocks.
   67          * The stream memory is freed when the number returns to zero.
   68          */
   69         zfs_refcount_t  zs_refs;
   70 } zstream_t;
   71 
   72 void            zfetch_init(void);
   73 void            zfetch_fini(void);
   74 
   75 void            dmu_zfetch_init(zfetch_t *, struct dnode *);
   76 void            dmu_zfetch_fini(zfetch_t *);
   77 zstream_t       *dmu_zfetch_prepare(zfetch_t *, uint64_t, uint64_t, boolean_t,
   78     boolean_t);
   79 void            dmu_zfetch_run(zstream_t *, boolean_t, boolean_t);
   80 void            dmu_zfetch(zfetch_t *, uint64_t, uint64_t, boolean_t, boolean_t,
   81     boolean_t);
   82 
   83 
   84 #ifdef  __cplusplus
   85 }
   86 #endif
   87 
   88 #endif  /* _DMU_ZFETCH_H */

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

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