The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2006 Ruslan Ermilov <ru@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/8.2/sys/geom/cache/g_cache.h 210230 2010-07-19 10:55:44Z ru $
   27  */
   28 
   29 #ifndef _G_CACHE_H_
   30 #define _G_CACHE_H_
   31 
   32 #include <sys/endian.h>
   33 
   34 #define G_CACHE_CLASS_NAME      "CACHE"
   35 #define G_CACHE_MAGIC           "GEOM::CACHE"
   36 #define G_CACHE_VERSION         1
   37 
   38 #ifdef _KERNEL
   39 #define G_CACHE_TYPE_MANUAL     0
   40 #define G_CACHE_TYPE_AUTOMATIC  1
   41 
   42 #define G_CACHE_DEBUG(lvl, ...) do {                                    \
   43         if (g_cache_debug >= (lvl)) {                                   \
   44                 printf("GEOM_CACHE");                                   \
   45                 if (g_cache_debug > 0)                                  \
   46                         printf("[%u]", lvl);                            \
   47                 printf(": ");                                           \
   48                 printf(__VA_ARGS__);                                    \
   49                 printf("\n");                                           \
   50         }                                                               \
   51 } while (0)
   52 #define G_CACHE_LOGREQ(bp, ...) do {                                    \
   53         if (g_cache_debug >= 2) {                                       \
   54                 printf("GEOM_CACHE[2]: ");                              \
   55                 printf(__VA_ARGS__);                                    \
   56                 printf(" ");                                            \
   57                 g_print_bio(bp);                                        \
   58                 printf("\n");                                           \
   59         }                                                               \
   60 } while (0)
   61 
   62 #define G_CACHE_BUCKETS         (1 << 3)
   63 #define G_CACHE_BUCKET(bno)     ((bno) & (G_CACHE_BUCKETS - 1))
   64 
   65 struct g_cache_softc {
   66         struct g_geom   *sc_geom;
   67         int             sc_type;
   68         u_int           sc_bshift;
   69         u_int           sc_bsize;
   70         off_t           sc_tail;
   71         struct mtx      sc_mtx;
   72         struct callout  sc_callout;
   73         LIST_HEAD(, g_cache_desc) sc_desclist[G_CACHE_BUCKETS];
   74         TAILQ_HEAD(, g_cache_desc) sc_usedlist;
   75         uma_zone_t      sc_zone;
   76 
   77         u_int           sc_maxent;              /* max entries */
   78         u_int           sc_nent;                /* allocated entries */
   79         u_int           sc_nused;               /* re-useable entries */
   80         u_int           sc_invalid;             /* invalid entries */
   81 
   82         uintmax_t       sc_reads;               /* #reads */
   83         uintmax_t       sc_readbytes;           /* bytes read */
   84         uintmax_t       sc_cachereads;          /* #reads from cache */
   85         uintmax_t       sc_cachereadbytes;      /* bytes read from cache */
   86         uintmax_t       sc_cachehits;           /* cache hits */
   87         uintmax_t       sc_cachemisses;         /* cache misses */
   88         uintmax_t       sc_cachefull;           /* #times a cache was full */
   89         uintmax_t       sc_writes;              /* #writes */
   90         uintmax_t       sc_wrotebytes;          /* bytes written */
   91 };
   92 #define sc_name sc_geom->name
   93 
   94 struct g_cache_desc {
   95         off_t           d_bno;                  /* block number */
   96         caddr_t         d_data;                 /* data area */
   97         struct bio      *d_biolist;             /* waiters */
   98         time_t          d_atime;                /* access time */
   99         int             d_flags;                /* flags */
  100 #define D_FLAG_USED     (1 << 0)                        /* can be reused */
  101 #define D_FLAG_INVALID  (1 << 1)                        /* invalid */
  102         LIST_ENTRY(g_cache_desc) d_next;        /* list */
  103         TAILQ_ENTRY(g_cache_desc) d_used;       /* used list */
  104 };
  105 
  106 #define G_CACHE_NEXT_BIO1(bp)   (bp)->bio_driver1
  107 #define G_CACHE_NEXT_BIO2(bp)   (bp)->bio_driver2
  108 #define G_CACHE_DESC1(bp)       (bp)->bio_caller1
  109 #define G_CACHE_DESC2(bp)       (bp)->bio_caller2
  110 
  111 #endif  /* _KERNEL */
  112 
  113 struct g_cache_metadata {
  114         char            md_magic[16];           /* Magic value. */
  115         uint32_t        md_version;             /* Version number. */
  116         char            md_name[16];            /* Cache value. */
  117         uint32_t        md_bsize;               /* Cache block size. */
  118         uint32_t        md_size;                /* Cache size. */
  119         uint64_t        md_provsize;            /* Provider's size. */
  120 };
  121 
  122 static __inline void
  123 cache_metadata_encode(const struct g_cache_metadata *md, u_char *data)
  124 {
  125 
  126         bcopy(md->md_magic, data, sizeof(md->md_magic));
  127         le32enc(data + 16, md->md_version);
  128         bcopy(md->md_name, data + 20, sizeof(md->md_name));
  129         le32enc(data + 36, md->md_bsize);
  130         le32enc(data + 40, md->md_size);
  131         le64enc(data + 44, md->md_provsize);
  132 }
  133 
  134 static __inline void
  135 cache_metadata_decode(const u_char *data, struct g_cache_metadata *md)
  136 {
  137 
  138         bcopy(data, md->md_magic, sizeof(md->md_magic));
  139         md->md_version = le32dec(data + 16);
  140         bcopy(data + 20, md->md_name, sizeof(md->md_name));
  141         md->md_bsize = le32dec(data + 36);
  142         md->md_size = le32dec(data + 40);
  143         md->md_provsize = le64dec(data + 44);
  144 }
  145 
  146 #endif  /* _G_CACHE_H_ */

Cache object: d50198d355e0e858fc95c3917cf896f0


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