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 *
16 * Note that we use a sockaddr_in6 to hold the address instead of the more
17 * typical sockaddr_storage. This is for space reasons, since sockaddr_storage
18 * is much larger than a sockaddr_in6.
19 */
20struct svc_cacherep {
21	struct hlist_node	c_hash;
22	struct list_head	c_lru;
23
24	unsigned char		c_state,	/* unused, inprog, done */
25				c_type,		/* status, buffer */
26				c_secure : 1;	/* req came from port < 1024 */
27	struct sockaddr_in6	c_addr;
28	__be32			c_xid;
29	u32			c_prot;
30	u32			c_proc;
31	u32			c_vers;
32	unsigned int		c_len;
33	__wsum			c_csum;
34	unsigned long		c_timestamp;
35	union {
36		struct kvec	u_vec;
37		__be32		u_status;
38	}			c_u;
39};
40
41#define c_replvec		c_u.u_vec
42#define c_replstat		c_u.u_status
43
44/* cache entry states */
45enum {
46	RC_UNUSED,
47	RC_INPROG,
48	RC_DONE
49};
50
51/* return values */
52enum {
53	RC_DROPIT,
54	RC_REPLY,
55	RC_DOIT
 
56};
57
58/*
59 * Cache types.
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.
63 */
64enum {
65	RC_NOCACHE,
66	RC_REPLSTAT,
67	RC_REPLBUFF,
68};
69
70/*
71 * If requests are retransmitted within this interval, they're dropped.
72 */
73#define RC_DELAY		(HZ/5)
74
75/* Cache entries expire after this time period */
76#define RC_EXPIRE		(120 * HZ)
77
78/* Checksum this amount of the request */
79#define RC_CSUMLEN		(256U)
80
81int	nfsd_reply_cache_init(void);
82void	nfsd_reply_cache_shutdown(void);
83int	nfsd_cache_lookup(struct svc_rqst *);
84void	nfsd_cache_update(struct svc_rqst *, int, __be32 *);
85int	nfsd_reply_cache_stats_open(struct inode *, struct file *);
 
 
 
 
 
 
 
86
87#endif /* NFSCACHE_H */