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