147 lines
4.6 KiB
C
147 lines
4.6 KiB
C
/*-
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* Copyright (c) 2006 Ruslan Ermilov <ru@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _G_CACHE_H_
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#define _G_CACHE_H_
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#include <sys/endian.h>
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#define G_CACHE_CLASS_NAME "CACHE"
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#define G_CACHE_MAGIC "GEOM::CACHE"
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#define G_CACHE_VERSION 1
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#ifdef _KERNEL
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#define G_CACHE_TYPE_MANUAL 0
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#define G_CACHE_TYPE_AUTOMATIC 1
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#define G_CACHE_DEBUG(lvl, ...) do { \
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if (g_cache_debug >= (lvl)) { \
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printf("GEOM_CACHE"); \
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if (g_cache_debug > 0) \
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printf("[%u]", lvl); \
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printf(": "); \
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printf(__VA_ARGS__); \
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printf("\n"); \
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} \
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} while (0)
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#define G_CACHE_LOGREQ(bp, ...) do { \
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if (g_cache_debug >= 2) { \
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printf("GEOM_CACHE[2]: "); \
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printf(__VA_ARGS__); \
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printf(" "); \
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g_print_bio(bp); \
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printf("\n"); \
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} \
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} while (0)
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#define G_CACHE_BUCKETS (1 << 3)
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#define G_CACHE_BUCKET(bno) ((bno) & (G_CACHE_BUCKETS - 1))
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struct g_cache_softc {
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struct g_geom *sc_geom;
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int sc_type;
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u_int sc_bshift;
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u_int sc_bsize;
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off_t sc_tail;
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struct mtx sc_mtx;
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struct callout sc_callout;
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LIST_HEAD(, g_cache_desc) sc_desclist[G_CACHE_BUCKETS];
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TAILQ_HEAD(, g_cache_desc) sc_usedlist;
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uma_zone_t sc_zone;
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u_int sc_maxent; /* max entries */
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u_int sc_nent; /* allocated entries */
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u_int sc_nused; /* re-useable entries */
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u_int sc_invalid; /* invalid entries */
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uintmax_t sc_reads; /* #reads */
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uintmax_t sc_readbytes; /* bytes read */
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uintmax_t sc_cachereads; /* #reads from cache */
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uintmax_t sc_cachereadbytes; /* bytes read from cache */
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uintmax_t sc_cachehits; /* cache hits */
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uintmax_t sc_cachemisses; /* cache misses */
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uintmax_t sc_cachefull; /* #times a cache was full */
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uintmax_t sc_writes; /* #writes */
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uintmax_t sc_wrotebytes; /* bytes written */
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};
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#define sc_name sc_geom->name
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struct g_cache_desc {
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off_t d_bno; /* block number */
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caddr_t d_data; /* data area */
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struct bio *d_biolist; /* waiters */
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time_t d_atime; /* access time */
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int d_flags; /* flags */
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#define D_FLAG_USED (1 << 0) /* can be reused */
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#define D_FLAG_INVALID (1 << 1) /* invalid */
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LIST_ENTRY(g_cache_desc) d_next; /* list */
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TAILQ_ENTRY(g_cache_desc) d_used; /* used list */
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};
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#define G_CACHE_NEXT_BIO1(bp) (bp)->bio_driver1
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#define G_CACHE_NEXT_BIO2(bp) (bp)->bio_driver2
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#define G_CACHE_DESC1(bp) (bp)->bio_caller1
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#define G_CACHE_DESC2(bp) (bp)->bio_caller2
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#endif /* _KERNEL */
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struct g_cache_metadata {
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char md_magic[16]; /* Magic value. */
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uint32_t md_version; /* Version number. */
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char md_name[16]; /* Cache value. */
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uint32_t md_bsize; /* Cache block size. */
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uint32_t md_size; /* Cache size. */
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uint64_t md_provsize; /* Provider's size. */
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};
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static __inline void
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cache_metadata_encode(const struct g_cache_metadata *md, u_char *data)
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{
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bcopy(md->md_magic, data, sizeof(md->md_magic));
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le32enc(data + 16, md->md_version);
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bcopy(md->md_name, data + 20, sizeof(md->md_name));
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le32enc(data + 36, md->md_bsize);
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le32enc(data + 40, md->md_size);
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le64enc(data + 44, md->md_provsize);
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}
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static __inline void
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cache_metadata_decode(const u_char *data, struct g_cache_metadata *md)
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{
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bcopy(data, md->md_magic, sizeof(md->md_magic));
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md->md_version = le32dec(data + 16);
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bcopy(data + 20, md->md_name, sizeof(md->md_name));
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md->md_bsize = le32dec(data + 36);
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md->md_size = le32dec(data + 40);
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md->md_provsize = le64dec(data + 44);
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}
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#endif /* _G_CACHE_H_ */
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