threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* A hash table (hashtab) maintains associations between
|
|
* key values and datum values. The type of the key values
|
|
* and the type of the datum values is arbitrary. The
|
|
* functions for hash computation and key comparison are
|
|
* provided by the creator of the table.
|
|
*
|
|
* Author : Stephen Smalley, <sds@tycho.nsa.gov>
|
|
*/
|
|
#ifndef _SS_HASHTAB_H_
|
|
#define _SS_HASHTAB_H_
|
|
|
|
#define HASHTAB_MAX_NODES 0xffffffff
|
|
|
|
struct hashtab_node {
|
|
void *key;
|
|
void *datum;
|
|
struct hashtab_node *next;
|
|
};
|
|
|
|
struct hashtab {
|
|
struct hashtab_node **htable; /* hash table */
|
|
u32 size; /* number of slots in hash table */
|
|
u32 nel; /* number of elements in hash table */
|
|
u32 (*hash_value)(struct hashtab *h, const void *key);
|
|
/* hash function */
|
|
int (*keycmp)(struct hashtab *h, const void *key1, const void *key2);
|
|
/* key comparison function */
|
|
};
|
|
|
|
struct hashtab_info {
|
|
u32 slots_used;
|
|
u32 max_chain_len;
|
|
};
|
|
|
|
/*
|
|
* Creates a new hash table with the specified characteristics.
|
|
*
|
|
* Returns NULL if insufficent space is available or
|
|
* the new hash table otherwise.
|
|
*/
|
|
struct hashtab *hashtab_create(u32 (*hash_value)(struct hashtab *h, const void *key),
|
|
int (*keycmp)(struct hashtab *h, const void *key1, const void *key2),
|
|
u32 size);
|
|
|
|
/*
|
|
* Inserts the specified (key, datum) pair into the specified hash table.
|
|
*
|
|
* Returns -ENOMEM on memory allocation error,
|
|
* -EEXIST if there is already an entry with the same key,
|
|
* -EINVAL for general errors or
|
|
0 otherwise.
|
|
*/
|
|
int hashtab_insert(struct hashtab *h, void *k, void *d);
|
|
|
|
/*
|
|
* Searches for the entry with the specified key in the hash table.
|
|
*
|
|
* Returns NULL if no entry has the specified key or
|
|
* the datum of the entry otherwise.
|
|
*/
|
|
void *hashtab_search(struct hashtab *h, const void *k);
|
|
|
|
/*
|
|
* Destroys the specified hash table.
|
|
*/
|
|
void hashtab_destroy(struct hashtab *h);
|
|
|
|
/*
|
|
* Applies the specified apply function to (key,datum,args)
|
|
* for each entry in the specified hash table.
|
|
*
|
|
* The order in which the function is applied to the entries
|
|
* is dependent upon the internal structure of the hash table.
|
|
*
|
|
* If apply returns a non-zero status, then hashtab_map will cease
|
|
* iterating through the hash table and will propagate the error
|
|
* return to its caller.
|
|
*/
|
|
int hashtab_map(struct hashtab *h,
|
|
int (*apply)(void *k, void *d, void *args),
|
|
void *args);
|
|
|
|
/* Fill info with some hash table statistics */
|
|
void hashtab_stat(struct hashtab *h, struct hashtab_info *info);
|
|
|
|
#endif /* _SS_HASHTAB_H */
|