2 * include/linux/nfsd/cache.h
4 * Request reply cache. This was heavily inspired by the
5 * implementation in 4.3BSD/4.4BSD.
7 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
15 #include <linux/uio.h>
18 * Representation of a reply cache entry. The first two members *must*
19 * be hash_next and hash_prev.
22 struct svc_cacherep
* c_hash_next
;
23 struct svc_cacherep
* c_hash_prev
;
24 struct svc_cacherep
* c_lru_next
;
25 struct svc_cacherep
* c_lru_prev
;
26 unsigned char c_state
, /* unused, inprog, done */
27 c_type
, /* status, buffer */
28 c_secure
: 1; /* req came from port < 1024 */
29 struct sockaddr_in c_addr
;
34 unsigned long c_timestamp
;
41 #define c_replvec c_u.u_vec
42 #define c_replstat c_u.u_status
44 /* cache entry states */
61 * We may want to add more types one day, e.g. for diropres and
62 * attrstat replies. Using cache entries with fixed length instead
63 * of buffer pointers may be more efficient.
72 * If requests are retransmitted within this interval, they're dropped.
74 #define RC_DELAY (HZ/5)
76 void nfsd_cache_init(void);
77 void nfsd_cache_shutdown(void);
78 int nfsd_cache_lookup(struct svc_rqst
*, int);
79 void nfsd_cache_update(struct svc_rqst
*, int, u32
*);
81 #endif /* __KERNEL__ */
82 #endif /* NFSCACHE_H */