/* * include/linux/nfsd/cache.h * * Request reply cache. This was heavily inspired by the * implementation in 4.3BSD/4.4BSD. * * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */ #ifndef NFSCACHE_H#define NFSCACHE_H #ifdef __KERNEL__#include <linux/in.h>#include <linux/uio.h> /* * Representation of a reply cache entry. The first two members *must* * be hash_next and hash_prev. */struct svc_cacherep {	struct hlist_node	c_hash;	struct list_head	c_lru; 	unsigned char		c_state,	/* unused, inprog, done */				c_type,		/* status, buffer */				c_secure : 1;	/* req came from port < 1024 */	struct sockaddr_in	c_addr;	__be32			c_xid;	u32			c_prot;	u32			c_proc;	u32			c_vers;	unsigned long		c_timestamp;	union {		struct kvec	u_vec;		__be32		u_status;	}			c_u;}; #define c_replvec		c_u.u_vec#define c_replstat		c_u.u_status /* cache entry states */enum {	RC_UNUSED,	RC_INPROG,	RC_DONE}; /* return values */enum {	RC_DROPIT,	RC_REPLY,	RC_DOIT,	RC_INTR}; /* * 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 {	RC_NOCACHE,	RC_REPLSTAT,	RC_REPLBUFF,}; /* * If requests are retransmitted within this interval, they're dropped. */#define RC_DELAY		(HZ/5) void	nfsd_cache_init(void);void	nfsd_cache_shutdown(void);int	nfsd_cache_lookup(struct svc_rqst *, int);void	nfsd_cache_update(struct svc_rqst *, int, __be32 *); #endif /* __KERNEL__ */#endif /* NFSCACHE_H */