1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_MODHASH_IMPL_H 28 #define _SYS_MODHASH_IMPL_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * Internal details for the kernel's generic hash implementation. 34 */ 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 #ifdef _KERNEL 41 42 #include <sys/ksynch.h> 43 #include <sys/modhash.h> 44 45 struct mod_hash_entry { 46 mod_hash_key_t mhe_key; /* stored hash key */ 47 mod_hash_val_t mhe_val; /* stored hash value */ 48 struct mod_hash_entry *mhe_next; /* next item in chain */ 49 }; 50 51 struct mod_hash_stat { 52 ulong_t mhs_hit; /* tried a 'find' and it succeeded */ 53 ulong_t mhs_miss; /* tried a 'find' but it failed */ 54 ulong_t mhs_coll; /* occur when insert fails because of dup's */ 55 ulong_t mhs_nelems; /* total number of stored key/value pairs */ 56 ulong_t mhs_nomem; /* number of times kmem_alloc failed */ 57 }; 58 59 struct mod_hash { 60 krwlock_t mh_contents; /* lock protecting contents */ 61 char *mh_name; /* hash name */ 62 int mh_sleep; /* kmem_alloc flag */ 63 size_t mh_nchains; /* # of elements in mh_entries */ 64 65 /* key and val destructor */ 66 void (*mh_kdtor)(mod_hash_key_t); 67 void (*mh_vdtor)(mod_hash_val_t); 68 69 /* key comparator */ 70 int (*mh_keycmp)(mod_hash_key_t, mod_hash_key_t); 71 72 /* hash algorithm, and algorithm-private data */ 73 uint_t (*mh_hashalg)(void *, mod_hash_key_t); 74 void *mh_hashalg_data; 75 76 struct mod_hash *mh_next; /* next hash in list */ 77 78 struct mod_hash_stat mh_stat; 79 80 struct mod_hash_entry *mh_entries[1]; 81 }; 82 83 /* 84 * MH_SIZE() 85 * Compute the size of a mod_hash_t, in bytes, given the number of 86 * elements it contains. 87 */ 88 #define MH_SIZE(n) \ 89 (sizeof (mod_hash_t) + ((n) - 1) * (sizeof (struct mod_hash_entry *))) 90 91 /* 92 * Module initialization; called once. 93 */ 94 void mod_hash_init(void); 95 96 #endif /* _KERNEL */ 97 98 #ifdef __cplusplus 99 } 100 #endif 101 102 #endif /* _SYS_MODHASH_IMPL_H */ 103