mirror of
https://git.code.sf.net/p/ntfs-3g/ntfs-3g.git
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119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/*
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* cache.h : deal with indexed LRU caches
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*
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* Copyright (c) 2008-2010 Jean-Pierre Andre
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the NTFS-3G
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _NTFS_CACHE_H_
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#define _NTFS_CACHE_H_
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#include "volume.h"
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struct CACHED_GENERIC {
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struct CACHED_GENERIC *next;
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struct CACHED_GENERIC *previous;
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void *variable;
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size_t varsize;
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union ALIGNMENT payload[0];
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} ;
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struct CACHED_INODE {
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struct CACHED_INODE *next;
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struct CACHED_INODE *previous;
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const char *pathname;
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size_t varsize;
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union ALIGNMENT payload[0];
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/* above fields must match "struct CACHED_GENERIC" */
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u64 inum;
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} ;
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struct CACHED_NIDATA {
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struct CACHED_NIDATA *next;
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struct CACHED_NIDATA *previous;
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const char *pathname; /* not used */
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size_t varsize; /* not used */
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union ALIGNMENT payload[0];
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/* above fields must match "struct CACHED_GENERIC" */
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u64 inum;
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ntfs_inode *ni;
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} ;
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struct CACHED_LOOKUP {
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struct CACHED_LOOKUP *next;
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struct CACHED_LOOKUP *previous;
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const char *name;
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size_t namesize;
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union ALIGNMENT payload[0];
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/* above fields must match "struct CACHED_GENERIC" */
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u64 parent;
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u64 inum;
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} ;
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enum {
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CACHE_FREE = 1,
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CACHE_NOHASH = 2
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} ;
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typedef int (*cache_compare)(const struct CACHED_GENERIC *cached,
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const struct CACHED_GENERIC *item);
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typedef void (*cache_free)(const struct CACHED_GENERIC *cached);
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typedef int (*cache_hash)(const struct CACHED_GENERIC *cached);
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struct HASH_ENTRY {
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struct HASH_ENTRY *next;
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struct CACHED_GENERIC *entry;
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} ;
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struct CACHE_HEADER {
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const char *name;
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struct CACHED_GENERIC *most_recent_entry;
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struct CACHED_GENERIC *oldest_entry;
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struct CACHED_GENERIC *free_entry;
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struct HASH_ENTRY *free_hash;
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struct HASH_ENTRY **first_hash;
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cache_free dofree;
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cache_hash dohash;
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unsigned long reads;
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unsigned long writes;
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unsigned long hits;
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int fixed_size;
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int max_hash;
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struct CACHED_GENERIC entry[0];
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} ;
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/* cast to generic, avoiding gcc warnings */
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#define GENERIC(pstr) ((const struct CACHED_GENERIC*)(const void*)(pstr))
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struct CACHED_GENERIC *ntfs_fetch_cache(struct CACHE_HEADER *cache,
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const struct CACHED_GENERIC *wanted,
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cache_compare compare);
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struct CACHED_GENERIC *ntfs_enter_cache(struct CACHE_HEADER *cache,
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const struct CACHED_GENERIC *item,
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cache_compare compare);
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int ntfs_invalidate_cache(struct CACHE_HEADER *cache,
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const struct CACHED_GENERIC *item,
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cache_compare compare, int flags);
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int ntfs_remove_cache(struct CACHE_HEADER *cache,
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struct CACHED_GENERIC *item, int flags);
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void ntfs_create_lru_caches(ntfs_volume *vol);
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void ntfs_free_lru_caches(ntfs_volume *vol);
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#endif /* _NTFS_CACHE_H_ */
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