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- /*
- * 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_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_done(struct xfs_mru_cache *mru);
- #endif /* __XFS_MRU_CACHE_H__ */
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