kernel/fs/xfs/xfs_mru_cache.h

   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 struct xfs_mru_cache;
  22
  23 struct xfs_mru_cache_elem {
  24         struct list_head list_node;
  25         unsigned long   key;
  26 };
  27
  28 /* Function pointer type for callback to free a client's data pointer. */
  29 typedef void (*xfs_mru_cache_free_func_t)(struct xfs_mru_cache_elem *elem);
  30
  31 int xfs_mru_cache_init(void);
  32 void xfs_mru_cache_uninit(void);
  33 int xfs_mru_cache_create(struct xfs_mru_cache **mrup, unsigned int lifetime_ms,
  34                              unsigned int grp_count,
  35                              xfs_mru_cache_free_func_t free_func);
  36 void xfs_mru_cache_destroy(struct xfs_mru_cache *mru);
  37 int xfs_mru_cache_insert(struct xfs_mru_cache *mru, unsigned long key,
  38                 struct xfs_mru_cache_elem *elem);
  39 struct xfs_mru_cache_elem *
  40 xfs_mru_cache_remove(struct xfs_mru_cache *mru, unsigned long key);
  41 void xfs_mru_cache_delete(struct xfs_mru_cache *mru, unsigned long key);
  42 struct xfs_mru_cache_elem *
  43 xfs_mru_cache_lookup(struct xfs_mru_cache *mru, unsigned long key);
  44 void xfs_mru_cache_done(struct xfs_mru_cache *mru);
  45
  46 #endif /* __XFS_MRU_CACHE_H__ */