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/*

 * 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 */