blob: 36dd3ec8b4eb17fdbdf83dfd8496e46a1409c30b [file] [log] [blame]
David Chinner2a82b8b2007-07-11 11:09:12 +10001/*
2 * Copyright (c) 2006-2007 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#ifndef __XFS_MRU_CACHE_H__
19#define __XFS_MRU_CACHE_H__
20
21
22/* Function pointer type for callback to free a client's data pointer. */
23typedef void (*xfs_mru_cache_free_func_t)(unsigned long, void*);
24
25typedef struct xfs_mru_cache
26{
27 struct radix_tree_root store; /* Core storage data structure. */
28 struct list_head *lists; /* Array of lists, one per grp. */
29 struct list_head reap_list; /* Elements overdue for reaping. */
30 spinlock_t lock; /* Lock to protect this struct. */
31 unsigned int grp_count; /* Number of discrete groups. */
32 unsigned int grp_time; /* Time period spanned by grps. */
33 unsigned int lru_grp; /* Group containing time zero. */
34 unsigned long time_zero; /* Time first element was added. */
David Chinner2a82b8b2007-07-11 11:09:12 +100035 xfs_mru_cache_free_func_t free_func; /* Function pointer for freeing. */
36 struct delayed_work work; /* Workqueue data for reaping. */
David Chinner65de5562007-08-16 15:21:11 +100037 unsigned int queued; /* work has been queued */
David Chinner2a82b8b2007-07-11 11:09:12 +100038} xfs_mru_cache_t;
39
40int xfs_mru_cache_init(void);
41void xfs_mru_cache_uninit(void);
42int xfs_mru_cache_create(struct xfs_mru_cache **mrup, unsigned int lifetime_ms,
43 unsigned int grp_count,
44 xfs_mru_cache_free_func_t free_func);
David Chinner2a82b8b2007-07-11 11:09:12 +100045void xfs_mru_cache_destroy(struct xfs_mru_cache *mru);
46int xfs_mru_cache_insert(struct xfs_mru_cache *mru, unsigned long key,
47 void *value);
48void * xfs_mru_cache_remove(struct xfs_mru_cache *mru, unsigned long key);
49void xfs_mru_cache_delete(struct xfs_mru_cache *mru, unsigned long key);
50void *xfs_mru_cache_lookup(struct xfs_mru_cache *mru, unsigned long key);
David Chinner2a82b8b2007-07-11 11:09:12 +100051void xfs_mru_cache_done(struct xfs_mru_cache *mru);
52
53#endif /* __XFS_MRU_CACHE_H__ */