g_cache.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2006 Ruslan Ermilov <ru@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 #ifndef _G_CACHE_H_
   32 #define _G_CACHE_H_
   33 
   34 #include <sys/endian.h>
   35 
   36 #define G_CACHE_CLASS_NAME      "CACHE"
   37 #define G_CACHE_MAGIC           "GEOM::CACHE"
   38 #define G_CACHE_VERSION         1
   39 
   40 #ifdef _KERNEL
   41 #define G_CACHE_TYPE_MANUAL     0
   42 #define G_CACHE_TYPE_AUTOMATIC  1
   43 
   44 #define G_CACHE_DEBUG(lvl, ...) \
   45     _GEOM_DEBUG("GEOM_CACHE", g_cache_debug, (lvl), NULL, __VA_ARGS__)
   46 #define G_CACHE_LOGREQ(bp, ...) \
   47     _GEOM_DEBUG("GEOM_CACHE", g_cache_debug, 2, (bp), __VA_ARGS__)
   48 
   49 #define G_CACHE_BUCKETS         (1 << 3)
   50 #define G_CACHE_BUCKET(bno)     ((bno) & (G_CACHE_BUCKETS - 1))
   51 
   52 struct g_cache_softc {
   53         struct g_geom   *sc_geom;
   54         int             sc_type;
   55         u_int           sc_bshift;
   56         u_int           sc_bsize;
   57         off_t           sc_tail;
   58         struct mtx      sc_mtx;
   59         struct callout  sc_callout;
   60         LIST_HEAD(, g_cache_desc) sc_desclist[G_CACHE_BUCKETS];
   61         TAILQ_HEAD(, g_cache_desc) sc_usedlist;
   62         uma_zone_t      sc_zone;
   63 
   64         u_int           sc_maxent;              /* max entries */
   65         u_int           sc_nent;                /* allocated entries */
   66         u_int           sc_nused;               /* re-useable entries */
   67         u_int           sc_invalid;             /* invalid entries */
   68 
   69         uintmax_t       sc_reads;               /* #reads */
   70         uintmax_t       sc_readbytes;           /* bytes read */
   71         uintmax_t       sc_cachereads;          /* #reads from cache */
   72         uintmax_t       sc_cachereadbytes;      /* bytes read from cache */
   73         uintmax_t       sc_cachehits;           /* cache hits */
   74         uintmax_t       sc_cachemisses;         /* cache misses */
   75         uintmax_t       sc_cachefull;           /* #times a cache was full */
   76         uintmax_t       sc_writes;              /* #writes */
   77         uintmax_t       sc_wrotebytes;          /* bytes written */
   78 };
   79 #define sc_name sc_geom->name
   80 
   81 struct g_cache_desc {
   82         off_t           d_bno;                  /* block number */
   83         caddr_t         d_data;                 /* data area */
   84         struct bio      *d_biolist;             /* waiters */
   85         time_t          d_atime;                /* access time */
   86         int             d_flags;                /* flags */
   87 #define D_FLAG_USED     (1 << 0)                        /* can be reused */
   88 #define D_FLAG_INVALID  (1 << 1)                        /* invalid */
   89         LIST_ENTRY(g_cache_desc) d_next;        /* list */
   90         TAILQ_ENTRY(g_cache_desc) d_used;       /* used list */
   91 };
   92 
   93 #define G_CACHE_NEXT_BIO1(bp)   (bp)->bio_driver1
   94 #define G_CACHE_NEXT_BIO2(bp)   (bp)->bio_driver2
   95 #define G_CACHE_DESC1(bp)       (bp)->bio_caller1
   96 #define G_CACHE_DESC2(bp)       (bp)->bio_caller2
   97 
   98 #endif  /* _KERNEL */
   99 
  100 struct g_cache_metadata {
  101         char            md_magic[16];           /* Magic value. */
  102         uint32_t        md_version;             /* Version number. */
  103         char            md_name[16];            /* Cache value. */
  104         uint32_t        md_bsize;               /* Cache block size. */
  105         uint32_t        md_size;                /* Cache size. */
  106         uint64_t        md_provsize;            /* Provider's size. */
  107 };
  108 
  109 static __inline void
  110 cache_metadata_encode(const struct g_cache_metadata *md, u_char *data)
  111 {
  112 
  113         bcopy(md->md_magic, data, sizeof(md->md_magic));
  114         le32enc(data + 16, md->md_version);
  115         bcopy(md->md_name, data + 20, sizeof(md->md_name));
  116         le32enc(data + 36, md->md_bsize);
  117         le32enc(data + 40, md->md_size);
  118         le64enc(data + 44, md->md_provsize);
  119 }
  120 
  121 static __inline void
  122 cache_metadata_decode(const u_char *data, struct g_cache_metadata *md)
  123 {
  124 
  125         bcopy(data, md->md_magic, sizeof(md->md_magic));
  126         md->md_version = le32dec(data + 16);
  127         bcopy(data + 20, md->md_name, sizeof(md->md_name));
  128         md->md_bsize = le32dec(data + 36);
  129         md->md_size = le32dec(data + 40);
  130         md->md_provsize = le64dec(data + 44);
  131 }
  132 
  133 #endif  /* _G_CACHE_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/geom/cache/g_cache.h

FreeBSD/Linux Kernel Cross Reference
sys/geom/cache/g_cache.h