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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* 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.
*/
#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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