Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/cache/g_cache.h
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 * $FreeBSD$ 29 */ 30 31 #ifndef _G_CACHE_H_ 32 #define _G_CACHE_H_ 33 34 #include <sys/endian.h> 35 36 #define G_CACHE_CLASS_NAME "CACHE" 37 #define G_CACHE_MAGIC "GEOM::CACHE" 38 #define G_CACHE_VERSION 1 39 40 #ifdef _KERNEL 41 #define G_CACHE_TYPE_MANUAL 0 42 #define G_CACHE_TYPE_AUTOMATIC 1 43 44 #define G_CACHE_DEBUG(lvl, ...) do { \ 45 if (g_cache_debug >= (lvl)) { \ 46 printf("GEOM_CACHE"); \ 47 if (g_cache_debug > 0) \ 48 printf("[%u]", lvl); \ 49 printf(": "); \ 50 printf(__VA_ARGS__); \ 51 printf("\n"); \ 52 } \ 53 } while (0) 54 #define G_CACHE_LOGREQ(bp, ...) do { \ 55 if (g_cache_debug >= 2) { \ 56 printf("GEOM_CACHE[2]: "); \ 57 printf(__VA_ARGS__); \ 58 printf(" "); \ 59 g_print_bio(bp); \ 60 printf("\n"); \ 61 } \ 62 } while (0) 63 64 #define G_CACHE_BUCKETS (1 << 3) 65 #define G_CACHE_BUCKET(bno) ((bno) & (G_CACHE_BUCKETS - 1)) 66 67 struct g_cache_softc { 68 struct g_geom *sc_geom; 69 int sc_type; 70 u_int sc_bshift; 71 u_int sc_bsize; 72 off_t sc_tail; 73 struct mtx sc_mtx; 74 struct callout sc_callout; 75 LIST_HEAD(, g_cache_desc) sc_desclist[G_CACHE_BUCKETS]; 76 TAILQ_HEAD(, g_cache_desc) sc_usedlist; 77 uma_zone_t sc_zone; 78 79 u_int sc_maxent; /* max entries */ 80 u_int sc_nent; /* allocated entries */ 81 u_int sc_nused; /* re-useable entries */ 82 u_int sc_invalid; /* invalid entries */ 83 84 uintmax_t sc_reads; /* #reads */ 85 uintmax_t sc_readbytes; /* bytes read */ 86 uintmax_t sc_cachereads; /* #reads from cache */ 87 uintmax_t sc_cachereadbytes; /* bytes read from cache */ 88 uintmax_t sc_cachehits; /* cache hits */ 89 uintmax_t sc_cachemisses; /* cache misses */ 90 uintmax_t sc_cachefull; /* #times a cache was full */ 91 uintmax_t sc_writes; /* #writes */ 92 uintmax_t sc_wrotebytes; /* bytes written */ 93 }; 94 #define sc_name sc_geom->name 95 96 struct g_cache_desc { 97 off_t d_bno; /* block number */ 98 caddr_t d_data; /* data area */ 99 struct bio *d_biolist; /* waiters */ 100 time_t d_atime; /* access time */ 101 int d_flags; /* flags */ 102 #define D_FLAG_USED (1 << 0) /* can be reused */ 103 #define D_FLAG_INVALID (1 << 1) /* invalid */ 104 LIST_ENTRY(g_cache_desc) d_next; /* list */ 105 TAILQ_ENTRY(g_cache_desc) d_used; /* used list */ 106 }; 107 108 #define G_CACHE_NEXT_BIO1(bp) (bp)->bio_driver1 109 #define G_CACHE_NEXT_BIO2(bp) (bp)->bio_driver2 110 #define G_CACHE_DESC1(bp) (bp)->bio_caller1 111 #define G_CACHE_DESC2(bp) (bp)->bio_caller2 112 113 #endif /* _KERNEL */ 114 115 struct g_cache_metadata { 116 char md_magic[16]; /* Magic value. */ 117 uint32_t md_version; /* Version number. */ 118 char md_name[16]; /* Cache value. */ 119 uint32_t md_bsize; /* Cache block size. */ 120 uint32_t md_size; /* Cache size. */ 121 uint64_t md_provsize; /* Provider's size. */ 122 }; 123 124 static __inline void 125 cache_metadata_encode(const struct g_cache_metadata *md, u_char *data) 126 { 127 128 bcopy(md->md_magic, data, sizeof(md->md_magic)); 129 le32enc(data + 16, md->md_version); 130 bcopy(md->md_name, data + 20, sizeof(md->md_name)); 131 le32enc(data + 36, md->md_bsize); 132 le32enc(data + 40, md->md_size); 133 le64enc(data + 44, md->md_provsize); 134 } 135 136 static __inline void 137 cache_metadata_decode(const u_char *data, struct g_cache_metadata *md) 138 { 139 140 bcopy(data, md->md_magic, sizeof(md->md_magic)); 141 md->md_version = le32dec(data + 16); 142 bcopy(data + 20, md->md_name, sizeof(md->md_name)); 143 md->md_bsize = le32dec(data + 36); 144 md->md_size = le32dec(data + 40); 145 md->md_provsize = le64dec(data + 44); 146 } 147 148 #endif /* _G_CACHE_H_ */
Cache object: 5e1319bc20f9bfc1e6aa643f46adf205
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