109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SYS_MODHASH_IMPL_H
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#define _SYS_MODHASH_IMPL_H
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/*
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* Internal details for the kernel's generic hash implementation.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/zfs_context.h>
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#include <sys/modhash.h>
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struct mod_hash_entry {
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mod_hash_key_t mhe_key; /* stored hash key */
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mod_hash_val_t mhe_val; /* stored hash value */
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struct mod_hash_entry *mhe_next; /* next item in chain */
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};
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struct mod_hash_stat {
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ulong_t mhs_hit; /* tried a 'find' and it succeeded */
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ulong_t mhs_miss; /* tried a 'find' but it failed */
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ulong_t mhs_coll; /* occur when insert fails because of dup's */
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ulong_t mhs_nelems; /* total number of stored key/value pairs */
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ulong_t mhs_nomem; /* number of times kmem_alloc failed */
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};
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struct mod_hash {
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krwlock_t mh_contents; /* lock protecting contents */
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char *mh_name; /* hash name */
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int mh_sleep; /* kmem_alloc flag */
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size_t mh_nchains; /* # of elements in mh_entries */
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/* key and val destructor */
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void (*mh_kdtor)(mod_hash_key_t);
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void (*mh_vdtor)(mod_hash_val_t);
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/* key comparator */
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int (*mh_keycmp)(mod_hash_key_t, mod_hash_key_t);
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/* hash algorithm, and algorithm-private data */
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uint_t (*mh_hashalg)(void *, mod_hash_key_t);
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void *mh_hashalg_data;
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struct mod_hash *mh_next; /* next hash in list */
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struct mod_hash_stat mh_stat;
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struct mod_hash_entry *mh_entries[1];
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};
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/*
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* MH_SIZE()
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* Compute the size of a mod_hash_t, in bytes, given the number of
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* elements it contains.
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*/
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#define MH_SIZE(n) \
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(sizeof (mod_hash_t) + ((n) - 1) * (sizeof (struct mod_hash_entry *)))
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/*
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* Module initialization; called once.
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*/
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void mod_hash_fini(void);
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void mod_hash_init(void);
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/*
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* Internal routines. Use directly with care.
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*/
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uint_t i_mod_hash(mod_hash_t *, mod_hash_key_t);
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int i_mod_hash_insert_nosync(mod_hash_t *, mod_hash_key_t, mod_hash_val_t,
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mod_hash_hndl_t);
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int i_mod_hash_remove_nosync(mod_hash_t *, mod_hash_key_t, mod_hash_val_t *);
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int i_mod_hash_find_nosync(mod_hash_t *, mod_hash_key_t, mod_hash_val_t *);
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void i_mod_hash_walk_nosync(mod_hash_t *, uint_t (*)(mod_hash_key_t,
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mod_hash_val_t *, void *), void *);
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void i_mod_hash_clear_nosync(mod_hash_t *hash);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_MODHASH_IMPL_H */
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