1  // SPDX-License-Identifier: GPL-2.0
2  /*
3   * Copyright (c) 2006-2007 Silicon Graphics, Inc.
4   * All Rights Reserved.
5   */
6  #ifndef __XFS_MRU_CACHE_H__
7  #define __XFS_MRU_CACHE_H__
8  
9  struct xfs_mru_cache;
10  
11  struct xfs_mru_cache_elem {
12  	struct list_head list_node;
13  	unsigned long	key;
14  };
15  
16  /* Function pointer type for callback to free a client's data pointer. */
17  typedef void (*xfs_mru_cache_free_func_t)(void *, struct xfs_mru_cache_elem *);
18  
19  int xfs_mru_cache_init(void);
20  void xfs_mru_cache_uninit(void);
21  int xfs_mru_cache_create(struct xfs_mru_cache **mrup, void *data,
22  		unsigned int lifetime_ms, unsigned int grp_count,
23  		xfs_mru_cache_free_func_t free_func);
24  void xfs_mru_cache_destroy(struct xfs_mru_cache *mru);
25  int xfs_mru_cache_insert(struct xfs_mru_cache *mru, unsigned long key,
26  		struct xfs_mru_cache_elem *elem);
27  struct xfs_mru_cache_elem *
28  xfs_mru_cache_remove(struct xfs_mru_cache *mru, unsigned long key);
29  void xfs_mru_cache_delete(struct xfs_mru_cache *mru, unsigned long key);
30  struct xfs_mru_cache_elem *
31  xfs_mru_cache_lookup(struct xfs_mru_cache *mru, unsigned long key);
32  void xfs_mru_cache_done(struct xfs_mru_cache *mru);
33  
34  #endif /* __XFS_MRU_CACHE_H__ */
35