Viewing: index.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2025-2026, DDN/Whamcloud, Inc.
*/
/*
* Index Access Module.
*
* Author: Yingjin Qian <qian@ddn.com>
*/
#ifndef __OSD_INDEX_H_
#define __OSD_INDEX_H_
#include <linux/rhashtable.h>
/* Store key and value together in @he_buf. */
struct hash_index_entry {
struct rhash_head he_hash;
struct list_head he_list_item;
__u64 he_offset;
size_t he_len;
size_t he_keylen;
char he_buf[];
};
/* Index access via @rhashtable. */
struct hash_index {
struct rhashtable hi_htbl;
struct rhashtable_params hi_htbl_params;
struct list_head hi_list;
size_t hi_reclen;
__u64 hi_next_offset;
};
int hash_index_init(struct hash_index *hind, size_t kenlen, size_t reclen);
void hash_index_fini(struct hash_index *hind);
int hash_index_lookup(struct hash_index *hind, const void *key, void *rec);
int hash_index_insert(struct hash_index *hind, void *key, size_t keylen,
void *rec, size_t reclen);
void hash_index_remove(struct hash_index *hind, const void *key);
/* TODO: Index access via Maple Tree. Only support in newer kernels. */
#endif /* __OSD_INDEX_H_ */
