mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2024-12-28 16:52:18 +00:00
16ff3f606c
Add more macros used for removing hash table entries. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
#ifndef HASHTABLE_H
|
|
#define HASHTABLE_H
|
|
|
|
#include "array_size.h"
|
|
#include "list.h"
|
|
|
|
#define HASH_SIZE(name) (ARRAY_SIZE(name))
|
|
|
|
#define HASHTABLE_DECLARE(name, size) struct hlist_head name[size]
|
|
|
|
#define HASHTABLE_DEFINE(name, size) \
|
|
HASHTABLE_DECLARE(name, size) = \
|
|
{ [0 ... ((size) - 1)] = HLIST_HEAD_INIT }
|
|
|
|
#define hash_head(table, key) (&(table)[(key) % HASH_SIZE(table)])
|
|
|
|
static inline void __hash_init(struct hlist_head *ht, unsigned int sz)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < sz; i++)
|
|
INIT_HLIST_HEAD(&ht[i]);
|
|
}
|
|
|
|
/**
|
|
* hash_init - initialize a hash table
|
|
* @table: hashtable to be initialized
|
|
*
|
|
* This has to be a macro since HASH_SIZE() will not work on pointers since
|
|
* it calculates the size during preprocessing.
|
|
*/
|
|
#define hash_init(table) __hash_init(table, HASH_SIZE(table))
|
|
|
|
/**
|
|
* hash_add - add an object to a hashtable
|
|
* @table: hashtable to add to
|
|
* @node: the &struct hlist_node of the object to be added
|
|
* @key: the key of the object to be added
|
|
*/
|
|
#define hash_add(table, node, key) \
|
|
hlist_add_head(node, hash_head(table, key))
|
|
|
|
/**
|
|
* hash_del - remove an object from a hashtable
|
|
* @node: &struct hlist_node of the object to remove
|
|
*/
|
|
static inline void hash_del(struct hlist_node *node)
|
|
{
|
|
hlist_del_init(node);
|
|
}
|
|
|
|
/**
|
|
* hash_for_each - iterate over a hashtable
|
|
* @table: hashtable to iterate
|
|
* @obj: the type * to use as a loop cursor for each entry
|
|
* @member: the name of the hlist_node within the struct
|
|
*/
|
|
#define hash_for_each(table, obj, member) \
|
|
for (int _bkt = 0; _bkt < HASH_SIZE(table); _bkt++) \
|
|
hlist_for_each_entry(obj, &table[_bkt], member)
|
|
|
|
/**
|
|
* hash_for_each_safe - iterate over a hashtable safe against removal of
|
|
* hash entry
|
|
* @table: hashtable to iterate
|
|
* @obj: the type * to use as a loop cursor for each entry
|
|
* @tmp: a &struct hlist_node used for temporary storage
|
|
* @member: the name of the hlist_node within the struct
|
|
*/
|
|
#define hash_for_each_safe(table, obj, tmp, member) \
|
|
for (int _bkt = 0; _bkt < HASH_SIZE(table); _bkt++) \
|
|
hlist_for_each_entry_safe(obj, tmp, &table[_bkt], member)
|
|
|
|
/**
|
|
* hash_for_each_possible - iterate over all possible objects hashing to the
|
|
* same bucket
|
|
* @table: hashtable to iterate
|
|
* @obj: the type * to use as a loop cursor for each entry
|
|
* @member: the name of the hlist_node within the struct
|
|
* @key: the key of the objects to iterate over
|
|
*/
|
|
#define hash_for_each_possible(table, obj, member, key) \
|
|
hlist_for_each_entry(obj, hash_head(table, key), member)
|
|
|
|
/**
|
|
* hash_for_each_possible_safe - iterate over all possible objects hashing to the
|
|
* same bucket safe against removals
|
|
* @table: hashtable to iterate
|
|
* @obj: the type * to use as a loop cursor for each entry
|
|
* @tmp: a &struct hlist_node used for temporary storage
|
|
* @member: the name of the hlist_node within the struct
|
|
* @key: the key of the objects to iterate over
|
|
*/
|
|
#define hash_for_each_possible_safe(table, obj, tmp, member, key) \
|
|
hlist_for_each_entry_safe(obj, tmp, hash_head(table, key), member)
|
|
|
|
#endif /* HASHTABLE_H */
|