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 /* 30 * Internal details for the kernel's generic hash implementation. 31 */ 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 #ifdef _KERNEL 38 39 #include <sys/ksynch.h> 40 #include <sys/modhash.h> 41 42 struct mod_hash_entry { 43 mod_hash_key_t mhe_key; /* stored hash key */ 44 mod_hash_val_t mhe_val; /* stored hash value */ 45 struct mod_hash_entry *mhe_next; /* next item in chain */ 46 }; 47 48 struct mod_hash_stat { 49 ulong_t mhs_hit; /* tried a 'find' and it succeeded */ 50 ulong_t mhs_miss; /* tried a 'find' but it failed */ 51 ulong_t mhs_coll; /* occur when insert fails because of dup's */ 52 ulong_t mhs_nelems; /* total number of stored key/value pairs */ 53 ulong_t mhs_nomem; /* number of times kmem_alloc failed */ 54 }; 55 56 struct mod_hash { 57 krwlock_t mh_contents; /* lock protecting contents */ 58 char *mh_name; /* hash name */ 59 int mh_sleep; /* kmem_alloc flag */ 60 size_t mh_nchains; /* # of elements in mh_entries */ 61 62 /* key and val destructor */ 63 void (*mh_kdtor)(mod_hash_key_t); 64 void (*mh_vdtor)(mod_hash_val_t); 65 66 /* key comparator */ 67 int (*mh_keycmp)(mod_hash_key_t, mod_hash_key_t); 68 69 /* hash algorithm, and algorithm-private data */ 70 uint_t (*mh_hashalg)(void *, mod_hash_key_t); 71 void *mh_hashalg_data; 72 73 struct mod_hash *mh_next; /* next hash in list */ 74 75 struct mod_hash_stat mh_stat; 76 77 struct mod_hash_entry *mh_entries[1]; 78 }; 79 80 /* 81 * MH_SIZE() 82 * Compute the size of a mod_hash_t, in bytes, given the number of 83 * elements it contains. 84 */ 85 #define MH_SIZE(n) \ 86 (sizeof (mod_hash_t) + ((n) - 1) * (sizeof (struct mod_hash_entry *))) 87 88 /* 89 * Module initialization; called once. 90 */ 91 void mod_hash_init(void); 92 93 /* 94 * Internal routines. Use directly with care. 95 */ 96 uint_t i_mod_hash(mod_hash_t *, mod_hash_key_t); 97 int i_mod_hash_insert_nosync(mod_hash_t *, mod_hash_key_t, mod_hash_val_t, 98 mod_hash_hndl_t); 99 int i_mod_hash_remove_nosync(mod_hash_t *, mod_hash_key_t, mod_hash_val_t *); 100 int i_mod_hash_find_nosync(mod_hash_t *, mod_hash_key_t, mod_hash_val_t *); 101 void i_mod_hash_walk_nosync(mod_hash_t *, uint_t (*)(mod_hash_key_t, 102 mod_hash_val_t *, void *), void *); 103 void i_mod_hash_clear_nosync(mod_hash_t *hash); 104 105 #endif /* _KERNEL */ 106 107 #ifdef __cplusplus 108 } 109 #endif 110 111 #endif /* _SYS_MODHASH_IMPL_H */ 112