04c7da702f
read requests to its consumer. It has been developed to address the problem of a horrible read performance of a 64k blocksize FS residing on a RAID3 array with 8 data components, where a single disk component would only get 8k read requests, thus effectively killing disk performance under high load. Documentation will be provided later. I'd like to thank Vsevolod Lobko for his bright ideas, and Pawel Jakub Dawidek for helping me fix the nasty bug.
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 = le16dec(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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