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