usbloadergx/source/libntfs/cache.h
giantpune 9e79c9d99b * remove little unused code
* code cleanup
2010-09-18 23:16:05 +00:00

128 lines
3.6 KiB
C

/*
* cache.h : deal with indexed LRU caches
*
* Copyright (c) 2008-2009 Jean-Pierre Andre
*
* This program/include file 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program/include file is distributed in the hope that it will 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 (in the main directory of the NTFS-3G
* distribution in the file COPYING); if not, write to the Free Software
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _NTFS_CACHE_H_
#define _NTFS_CACHE_H_
#include "volume.h"
struct CACHED_GENERIC
{
struct CACHED_GENERIC *next;
struct CACHED_GENERIC *previous;
void *variable;
size_t varsize;
union
{
/* force alignment for pointers and u64 */
u64 u64align;
void *ptralign;
} fixed[0];
} ;
struct CACHED_INODE
{
struct CACHED_INODE *next;
struct CACHED_INODE *previous;
const char *pathname;
size_t varsize;
/* above fields must match "struct CACHED_GENERIC" */
u64 inum;
} ;
struct CACHED_NIDATA
{
struct CACHED_NIDATA *next;
struct CACHED_NIDATA *previous;
const char *pathname; /* not used */
size_t varsize; /* not used */
/* above fields must match "struct CACHED_GENERIC" */
u64 inum;
ntfs_inode *ni;
} ;
struct CACHED_LOOKUP
{
struct CACHED_LOOKUP *next;
struct CACHED_LOOKUP *previous;
const char *name;
size_t namesize;
/* above fields must match "struct CACHED_GENERIC" */
u64 parent;
u64 inum;
} ;
enum
{
CACHE_FREE = 1,
CACHE_NOHASH = 2
} ;
typedef int ( *cache_compare )( const struct CACHED_GENERIC *cached,
const struct CACHED_GENERIC *item );
typedef void ( *cache_free )( const struct CACHED_GENERIC *cached );
typedef int ( *cache_hash )( const struct CACHED_GENERIC *cached );
struct HASH_ENTRY
{
struct HASH_ENTRY *next;
struct CACHED_GENERIC *entry;
} ;
struct CACHE_HEADER
{
const char *name;
struct CACHED_GENERIC *most_recent_entry;
struct CACHED_GENERIC *oldest_entry;
struct CACHED_GENERIC *free_entry;
struct HASH_ENTRY *free_hash;
struct HASH_ENTRY **first_hash;
cache_free dofree;
cache_hash dohash;
unsigned long reads;
unsigned long writes;
unsigned long hits;
int fixed_size;
int max_hash;
struct CACHED_GENERIC entry[0];
} ;
/* cast to generic, avoiding gcc warnings */
#define GENERIC(pstr) ((const struct CACHED_GENERIC*)(const void*)(pstr))
struct CACHED_GENERIC *ntfs_fetch_cache( struct CACHE_HEADER *cache,
const struct CACHED_GENERIC *wanted,
cache_compare compare );
struct CACHED_GENERIC *ntfs_enter_cache( struct CACHE_HEADER *cache,
const struct CACHED_GENERIC *item,
cache_compare compare );
int ntfs_invalidate_cache( struct CACHE_HEADER *cache,
const struct CACHED_GENERIC *item,
cache_compare compare, int flags );
int ntfs_remove_cache( struct CACHE_HEADER *cache,
struct CACHED_GENERIC *item, int flags );
void ntfs_create_lru_caches( ntfs_volume *vol );
void ntfs_free_lru_caches( ntfs_volume *vol );
#endif /* _NTFS_CACHE_H_ */