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Diffstat (limited to 'fs/xfs/xfs_mru_cache.h')
| -rw-r--r-- | fs/xfs/xfs_mru_cache.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/fs/xfs/xfs_mru_cache.h b/fs/xfs/xfs_mru_cache.h new file mode 100644 index 000000000000..624fd10ee8e5 --- /dev/null +++ b/fs/xfs/xfs_mru_cache.h @@ -0,0 +1,57 @@ +/* + * 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. */ + unsigned long next_reap; /* Time that the reaper should + next do something. */ + unsigned int reap_all; /* if set, reap all lists */ + xfs_mru_cache_free_func_t free_func; /* Function pointer for freeing. */ + struct delayed_work work; /* Workqueue data for reaping. */ +} 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, int restart); +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__ */ |