g_cache.h (4477B) - Raw
1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2006 Ruslan Ermilov <ru@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 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, ...) \ 43 _GEOM_DEBUG("GEOM_CACHE", g_cache_debug, (lvl), NULL, __VA_ARGS__) 44 #define G_CACHE_LOGREQ(bp, ...) \ 45 _GEOM_DEBUG("GEOM_CACHE", g_cache_debug, 2, (bp), __VA_ARGS__) 46 47 #define G_CACHE_BUCKETS (1 << 3) 48 #define G_CACHE_BUCKET(bno) ((bno) & (G_CACHE_BUCKETS - 1)) 49 50 struct g_cache_softc { 51 struct g_geom *sc_geom; 52 int sc_type; 53 u_int sc_bshift; 54 u_int sc_bsize; 55 off_t sc_tail; 56 struct mtx sc_mtx; 57 struct callout sc_callout; 58 LIST_HEAD(, g_cache_desc) sc_desclist[G_CACHE_BUCKETS]; 59 TAILQ_HEAD(, g_cache_desc) sc_usedlist; 60 uma_zone_t sc_zone; 61 62 u_int sc_maxent; /* max entries */ 63 u_int sc_nent; /* allocated entries */ 64 u_int sc_nused; /* re-useable entries */ 65 u_int sc_invalid; /* invalid entries */ 66 67 uintmax_t sc_reads; /* #reads */ 68 uintmax_t sc_readbytes; /* bytes read */ 69 uintmax_t sc_cachereads; /* #reads from cache */ 70 uintmax_t sc_cachereadbytes; /* bytes read from cache */ 71 uintmax_t sc_cachehits; /* cache hits */ 72 uintmax_t sc_cachemisses; /* cache misses */ 73 uintmax_t sc_cachefull; /* #times a cache was full */ 74 uintmax_t sc_writes; /* #writes */ 75 uintmax_t sc_wrotebytes; /* bytes written */ 76 }; 77 #define sc_name sc_geom->name 78 79 struct g_cache_desc { 80 off_t d_bno; /* block number */ 81 caddr_t d_data; /* data area */ 82 struct bio *d_biolist; /* waiters */ 83 time_t d_atime; /* access time */ 84 int d_flags; /* flags */ 85 #define D_FLAG_USED (1 << 0) /* can be reused */ 86 #define D_FLAG_INVALID (1 << 1) /* invalid */ 87 LIST_ENTRY(g_cache_desc) d_next; /* list */ 88 TAILQ_ENTRY(g_cache_desc) d_used; /* used list */ 89 }; 90 91 #define G_CACHE_NEXT_BIO1(bp) (bp)->bio_driver1 92 #define G_CACHE_NEXT_BIO2(bp) (bp)->bio_driver2 93 #define G_CACHE_DESC1(bp) (bp)->bio_caller1 94 #define G_CACHE_DESC2(bp) (bp)->bio_caller2 95 96 #endif /* _KERNEL */ 97 98 struct g_cache_metadata { 99 char md_magic[16]; /* Magic value. */ 100 uint32_t md_version; /* Version number. */ 101 char md_name[16]; /* Cache value. */ 102 uint32_t md_bsize; /* Cache block size. */ 103 uint32_t md_size; /* Cache size. */ 104 uint64_t md_provsize; /* Provider's size. */ 105 }; 106 107 static __inline void 108 cache_metadata_encode(const struct g_cache_metadata *md, u_char *data) 109 { 110 111 bcopy(md->md_magic, data, sizeof(md->md_magic)); 112 le32enc(data + 16, md->md_version); 113 bcopy(md->md_name, data + 20, sizeof(md->md_name)); 114 le32enc(data + 36, md->md_bsize); 115 le32enc(data + 40, md->md_size); 116 le64enc(data + 44, md->md_provsize); 117 } 118 119 static __inline void 120 cache_metadata_decode(const u_char *data, struct g_cache_metadata *md) 121 { 122 123 bcopy(data, md->md_magic, sizeof(md->md_magic)); 124 md->md_version = le32dec(data + 16); 125 bcopy(data + 20, md->md_name, sizeof(md->md_name)); 126 md->md_bsize = le32dec(data + 36); 127 md->md_size = le32dec(data + 40); 128 md->md_provsize = le64dec(data + 44); 129 } 130 131 #endif /* _G_CACHE_H_ */