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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_MODHASH_IMPL_H 27 #define _SYS_MODHASH_IMPL_H 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 /* 32 * Internal details for the kernel's generic hash implementation. 33 */ 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 #ifdef _KERNEL 40 41 #include <sys/ksynch.h> 42 #include <sys/modhash.h> 43 44 struct mod_hash_entry { 45 mod_hash_key_t mhe_key; /* stored hash key */ 46 mod_hash_val_t mhe_val; /* stored hash value */ 47 struct mod_hash_entry *mhe_next; /* next item in chain */ 48 }; 49 50 struct mod_hash_stat { 51 ulong_t mhs_hit; /* tried a 'find' and it succeeded */ 52 ulong_t mhs_miss; /* tried a 'find' but it failed */ 53 ulong_t mhs_coll; /* occur when insert fails because of dup's */ 54 ulong_t mhs_nelems; /* total number of stored key/value pairs */ 55 ulong_t mhs_nomem; /* number of times kmem_alloc failed */ 56 }; 57 58 struct mod_hash { 59 krwlock_t mh_contents; /* lock protecting contents */ 60 char *mh_name; /* hash name */ 61 int mh_sleep; /* kmem_alloc flag */ 62 size_t mh_nchains; /* # of elements in mh_entries */ 63 64 /* key and val destructor */ 65 void (*mh_kdtor)(mod_hash_key_t); 66 void (*mh_vdtor)(mod_hash_val_t); 67 68 /* key comparator */ 69 int (*mh_keycmp)(mod_hash_key_t, mod_hash_key_t); 70 71 /* hash algorithm, and algorithm-private data */ 72 uint_t (*mh_hashalg)(void *, mod_hash_key_t); 73 void *mh_hashalg_data; 74 75 struct mod_hash *mh_next; /* next hash in list */ 76 77 struct mod_hash_stat mh_stat; 78 79 struct mod_hash_entry *mh_entries[1]; 80 }; 81 82 /* 83 * MH_SIZE() 84 * Compute the size of a mod_hash_t, in bytes, given the number of 85 * elements it contains. 86 */ 87 #define MH_SIZE(n) \ 88 (sizeof (mod_hash_t) + ((n) - 1) * (sizeof (struct mod_hash_entry *))) 89 90 /* 91 * Module initialization; called once. 92 */ 93 void mod_hash_init(void); 94 95 /* 96 * Internal routines. Use directly with care. 97 */ 98 uint_t i_mod_hash(mod_hash_t *, mod_hash_key_t); 99 int i_mod_hash_insert_nosync(mod_hash_t *, mod_hash_key_t, mod_hash_val_t, 100 mod_hash_hndl_t); 101 int i_mod_hash_remove_nosync(mod_hash_t *, mod_hash_key_t, mod_hash_val_t *); 102 int i_mod_hash_find_nosync(mod_hash_t *, mod_hash_key_t, mod_hash_val_t *); 103 void i_mod_hash_walk_nosync(mod_hash_t *, uint_t (*)(mod_hash_key_t, 104 mod_hash_val_t *, void *), void *); 105 void i_mod_hash_clear_nosync(mod_hash_t *hash); 106 107 #endif /* _KERNEL */ 108 109 #ifdef __cplusplus 110 } 111 #endif 112 113 #endif /* _SYS_MODHASH_IMPL_H */ 114