linux/fs/nfsd/cache.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Request reply cache. This was heavily inspired by the
 * implementation in 4.3BSD/4.4BSD.
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <[email protected]>
 */

#ifndef NFSCACHE_H
#define NFSCACHE_H

#include <linux/sunrpc/svc.h>
#include "netns.h"

/*
 * Representation of a reply cache entry.
 *
 * Note that we use a sockaddr_in6 to hold the address instead of the more
 * typical sockaddr_storage. This is for space reasons, since sockaddr_storage
 * is much larger than a sockaddr_in6.
 */
struct nfsd_cacherep { … };

#define c_replvec …
#define c_replstat …

/* cache entry states */
enum { … };

/* return values */
enum { … };

/*
 * Cache types.
 * We may want to add more types one day, e.g. for diropres and
 * attrstat replies. Using cache entries with fixed length instead
 * of buffer pointers may be more efficient.
 */
enum { … };

/* Cache entries expire after this time period */
#define RC_EXPIRE …

/* Checksum this amount of the request */
#define RC_CSUMLEN …

int	nfsd_drc_slab_create(void);
void	nfsd_drc_slab_free(void);
int	nfsd_reply_cache_init(struct nfsd_net *);
void	nfsd_reply_cache_shutdown(struct nfsd_net *);
int	nfsd_cache_lookup(struct svc_rqst *rqstp, unsigned int start,
			  unsigned int len, struct nfsd_cacherep **cacherep);
void	nfsd_cache_update(struct svc_rqst *rqstp, struct nfsd_cacherep *rp,
			  int cachetype, __be32 *statp);
int	nfsd_reply_cache_stats_show(struct seq_file *m, void *v);

#endif /* NFSCACHE_H */