56 lines
2.4 KiB
C
56 lines
2.4 KiB
C
/*
|
|
* Copyright (c) 2006-2007 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#ifndef __XFS_MRU_CACHE_H__
|
|
#define __XFS_MRU_CACHE_H__
|
|
|
|
|
|
/* Function pointer type for callback to free a client's data pointer. */
|
|
typedef void (*xfs_mru_cache_free_func_t)(unsigned long, void*);
|
|
|
|
typedef struct xfs_mru_cache
|
|
{
|
|
struct radix_tree_root store; /* Core storage data structure. */
|
|
struct list_head *lists; /* Array of lists, one per grp. */
|
|
struct list_head reap_list; /* Elements overdue for reaping. */
|
|
spinlock_t lock; /* Lock to protect this struct. */
|
|
unsigned int grp_count; /* Number of discrete groups. */
|
|
unsigned int grp_time; /* Time period spanned by grps. */
|
|
unsigned int lru_grp; /* Group containing time zero. */
|
|
unsigned long time_zero; /* Time first element was added. */
|
|
xfs_mru_cache_free_func_t free_func; /* Function pointer for freeing. */
|
|
struct delayed_work work; /* Workqueue data for reaping. */
|
|
unsigned int queued; /* work has been queued */
|
|
} xfs_mru_cache_t;
|
|
|
|
int xfs_mru_cache_init(void);
|
|
void xfs_mru_cache_uninit(void);
|
|
int xfs_mru_cache_create(struct xfs_mru_cache **mrup, unsigned int lifetime_ms,
|
|
unsigned int grp_count,
|
|
xfs_mru_cache_free_func_t free_func);
|
|
void xfs_mru_cache_flush(xfs_mru_cache_t *mru);
|
|
void xfs_mru_cache_destroy(struct xfs_mru_cache *mru);
|
|
int xfs_mru_cache_insert(struct xfs_mru_cache *mru, unsigned long key,
|
|
void *value);
|
|
void * xfs_mru_cache_remove(struct xfs_mru_cache *mru, unsigned long key);
|
|
void xfs_mru_cache_delete(struct xfs_mru_cache *mru, unsigned long key);
|
|
void *xfs_mru_cache_lookup(struct xfs_mru_cache *mru, unsigned long key);
|
|
void *xfs_mru_cache_peek(struct xfs_mru_cache *mru, unsigned long key);
|
|
void xfs_mru_cache_done(struct xfs_mru_cache *mru);
|
|
|
|
#endif /* __XFS_MRU_CACHE_H__ */
|