linux/fs/smb/client/fscache.h

/* SPDX-License-Identifier: LGPL-2.1 */
/*
 *   CIFS filesystem cache interface definitions
 *
 *   Copyright (c) 2010 Novell, Inc.
 *   Authors(s): Suresh Jayaraman ([email protected]>
 *
 */
#ifndef _CIFS_FSCACHE_H
#define _CIFS_FSCACHE_H

#include <linux/swap.h>
#include <linux/fscache.h>

#include "cifsglob.h"

/*
 * Coherency data attached to CIFS volume within the cache
 */
struct cifs_fscache_volume_coherency_data { … } __packed;

/*
 * Coherency data attached to CIFS inode within the cache.
 */
struct cifs_fscache_inode_coherency_data { … };

#ifdef CONFIG_CIFS_FSCACHE

/*
 * fscache.c
 */
extern int cifs_fscache_get_super_cookie(struct cifs_tcon *);
extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);

extern void cifs_fscache_get_inode_cookie(struct inode *inode);
extern void cifs_fscache_release_inode_cookie(struct inode *);
extern void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update);

static inline
void cifs_fscache_fill_coherency(struct inode *inode,
				 struct cifs_fscache_inode_coherency_data *cd)
{ … }


static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
{ … }

static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags)
{ … }

static inline bool cifs_fscache_enabled(struct inode *inode)
{ … }

#else /* CONFIG_CIFS_FSCACHE */
static inline
void cifs_fscache_fill_coherency(struct inode *inode,
				 struct cifs_fscache_inode_coherency_data *cd)
{
}

static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}

static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}
static inline bool cifs_fscache_enabled(struct inode *inode) { return false; }

#endif /* CONFIG_CIFS_FSCACHE */

#endif /* _CIFS_FSCACHE_H */