1/*
 2 * Request reply cache. This was heavily inspired by the
 3 * implementation in 4.3BSD/4.4BSD.
 4 *
 5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 6 */
 7
 8#ifndef NFSCACHE_H
 9#define NFSCACHE_H
10
11#include <linux/sunrpc/svc.h>
12
13/*
14 * Representation of a reply cache entry.
15 */
16struct svc_cacherep {
17	struct hlist_node	c_hash;
18	struct list_head	c_lru;
19
20	unsigned char		c_state,	/* unused, inprog, done */
21				c_type,		/* status, buffer */
22				c_secure : 1;	/* req came from port < 1024 */
23	struct sockaddr_in	c_addr;
24	__be32			c_xid;
25	u32			c_prot;
26	u32			c_proc;
27	u32			c_vers;
28	unsigned long		c_timestamp;
29	union {
30		struct kvec	u_vec;
31		__be32		u_status;
32	}			c_u;
33};
34
35#define c_replvec		c_u.u_vec
36#define c_replstat		c_u.u_status
37
38/* cache entry states */
39enum {
40	RC_UNUSED,
41	RC_INPROG,
42	RC_DONE
43};
44
45/* return values */
46enum {
47	RC_DROPIT,
48	RC_REPLY,
49	RC_DOIT,
50	RC_INTR
51};
52
53/*
54 * Cache types.
55 * We may want to add more types one day, e.g. for diropres and
56 * attrstat replies. Using cache entries with fixed length instead
57 * of buffer pointers may be more efficient.
58 */
59enum {
60	RC_NOCACHE,
61	RC_REPLSTAT,
62	RC_REPLBUFF,
63};
64
65/*
66 * If requests are retransmitted within this interval, they're dropped.
67 */
68#define RC_DELAY		(HZ/5)
69
70int	nfsd_reply_cache_init(void);
71void	nfsd_reply_cache_shutdown(void);
72int	nfsd_cache_lookup(struct svc_rqst *);
73void	nfsd_cache_update(struct svc_rqst *, int, __be32 *);
74
75#ifdef CONFIG_NFSD_V4
76void	nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp);
77#else  /* CONFIG_NFSD_V4 */
78static inline void nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp)
79{
80}
81#endif /* CONFIG_NFSD_V4 */
82
83#endif /* NFSCACHE_H */

 1/*
 2 * Request reply cache. This was heavily inspired by the
 3 * implementation in 4.3BSD/4.4BSD.
 4 *
 5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 6 */
 7
 8#ifndef NFSCACHE_H
 9#define NFSCACHE_H
10
11#include <linux/sunrpc/svc.h>
12
13/*
14 * Representation of a reply cache entry.
15 */
16struct svc_cacherep {
17	struct hlist_node	c_hash;
18	struct list_head	c_lru;
19
20	unsigned char		c_state,	/* unused, inprog, done */
21				c_type,		/* status, buffer */
22				c_secure : 1;	/* req came from port < 1024 */
23	struct sockaddr_in	c_addr;
24	__be32			c_xid;
25	u32			c_prot;
26	u32			c_proc;
27	u32			c_vers;
28	unsigned long		c_timestamp;
29	union {
30		struct kvec	u_vec;
31		__be32		u_status;
32	}			c_u;
33};
34
35#define c_replvec		c_u.u_vec
36#define c_replstat		c_u.u_status
37
38/* cache entry states */
39enum {
40	RC_UNUSED,
41	RC_INPROG,
42	RC_DONE
43};
44
45/* return values */
46enum {
47	RC_DROPIT,
48	RC_REPLY,
49	RC_DOIT,
50	RC_INTR
51};
52
53/*
54 * Cache types.
55 * We may want to add more types one day, e.g. for diropres and
56 * attrstat replies. Using cache entries with fixed length instead
57 * of buffer pointers may be more efficient.
58 */
59enum {
60	RC_NOCACHE,
61	RC_REPLSTAT,
62	RC_REPLBUFF,
63};
64
65/*
66 * If requests are retransmitted within this interval, they're dropped.
67 */
68#define RC_DELAY		(HZ/5)
69
70int	nfsd_reply_cache_init(void);
71void	nfsd_reply_cache_shutdown(void);
72int	nfsd_cache_lookup(struct svc_rqst *);
73void	nfsd_cache_update(struct svc_rqst *, int, __be32 *);
74
75#ifdef CONFIG_NFSD_V4
76void	nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp);
77#else  /* CONFIG_NFSD_V4 */
78static inline void nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp)
79{
80}
81#endif /* CONFIG_NFSD_V4 */
82
83#endif /* NFSCACHE_H */