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>
14 #include <linux/sched.h>
17 * Representation of a reply cache entry. The first two members *must*
18 * be hash_next and hash_prev.
21 struct svc_cacherep
* c_hash_next
;
22 struct svc_cacherep
* c_hash_prev
;
23 struct svc_cacherep
* c_lru_next
;
24 struct svc_cacherep
* c_lru_prev
;
25 unsigned char c_state
, /* unused, inprog, done */
26 c_type
, /* status, buffer */
27 c_secure
: 1; /* req came from port < 1024 */
28 struct sockaddr_in c_addr
;
33 unsigned long c_timestamp
;
35 struct svc_buf u_buffer
;
40 #define c_replbuf c_u.u_buffer
41 #define c_replstat c_u.u_status
43 /* cache entry states */
60 * We may want to add more types one day, e.g. for diropres and
61 * attrstat replies. Using cache entries with fixed length instead
62 * of buffer pointers may be more efficient.
71 * If requests are retransmitted within this interval, they're dropped.
73 #define RC_DELAY (HZ/5)
75 void nfsd_cache_init(void);
76 void nfsd_cache_shutdown(void);
77 int nfsd_cache_lookup(struct svc_rqst
*, int);
78 void nfsd_cache_update(struct svc_rqst
*, int, u32
*);
80 #endif /* __KERNEL__ */
81 #endif /* NFSCACHE_H */