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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1/*
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. */
35 unsigned long next_reap; /* Time that the reaper should
36 next do something. */
37 unsigned int reap_all; /* if set, reap all lists */
38 xfs_mru_cache_free_func_t free_func; /* Function pointer for freeing. */
39 struct delayed_work work; /* Workqueue data for reaping. */
40} xfs_mru_cache_t;
41
42int xfs_mru_cache_init(void);
43void xfs_mru_cache_uninit(void);
44int xfs_mru_cache_create(struct xfs_mru_cache **mrup, unsigned int lifetime_ms,
45 unsigned int grp_count,
46 xfs_mru_cache_free_func_t free_func);
47void xfs_mru_cache_flush(xfs_mru_cache_t *mru, int restart);
48void xfs_mru_cache_destroy(struct xfs_mru_cache *mru);
49int xfs_mru_cache_insert(struct xfs_mru_cache *mru, unsigned long key,
50 void *value);
51void * xfs_mru_cache_remove(struct xfs_mru_cache *mru, unsigned long key);
52void xfs_mru_cache_delete(struct xfs_mru_cache *mru, unsigned long key);
53void *xfs_mru_cache_lookup(struct xfs_mru_cache *mru, unsigned long key);
54void *xfs_mru_cache_peek(struct xfs_mru_cache *mru, unsigned long key);
55void xfs_mru_cache_done(struct xfs_mru_cache *mru);
56
57#endif /* __XFS_MRU_CACHE_H__ */