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1da177e4 LT |
1 | /* |
2 | * include/linux/nfsd/cache.h | |
3 | * | |
4 | * Request reply cache. This was heavily inspired by the | |
5 | * implementation in 4.3BSD/4.4BSD. | |
6 | * | |
7 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
8 | */ | |
9 | ||
10 | #ifndef NFSCACHE_H | |
11 | #define NFSCACHE_H | |
12 | ||
1da177e4 LT |
13 | #include <linux/in.h> |
14 | #include <linux/uio.h> | |
15 | ||
16 | /* | |
fca4217c | 17 | * Representation of a reply cache entry. |
1da177e4 LT |
18 | */ |
19 | struct svc_cacherep { | |
20 | struct hlist_node c_hash; | |
21 | struct list_head c_lru; | |
22 | ||
23 | unsigned char c_state, /* unused, inprog, done */ | |
24 | c_type, /* status, buffer */ | |
25 | c_secure : 1; /* req came from port < 1024 */ | |
26 | struct sockaddr_in c_addr; | |
c7afef1f | 27 | __be32 c_xid; |
1da177e4 LT |
28 | u32 c_prot; |
29 | u32 c_proc; | |
30 | u32 c_vers; | |
31 | unsigned long c_timestamp; | |
32 | union { | |
33 | struct kvec u_vec; | |
c7afef1f | 34 | __be32 u_status; |
1da177e4 LT |
35 | } c_u; |
36 | }; | |
37 | ||
38 | #define c_replvec c_u.u_vec | |
39 | #define c_replstat c_u.u_status | |
40 | ||
41 | /* cache entry states */ | |
42 | enum { | |
43 | RC_UNUSED, | |
44 | RC_INPROG, | |
45 | RC_DONE | |
46 | }; | |
47 | ||
48 | /* return values */ | |
49 | enum { | |
50 | RC_DROPIT, | |
51 | RC_REPLY, | |
52 | RC_DOIT, | |
53 | RC_INTR | |
54 | }; | |
55 | ||
56 | /* | |
57 | * Cache types. | |
58 | * We may want to add more types one day, e.g. for diropres and | |
59 | * attrstat replies. Using cache entries with fixed length instead | |
60 | * of buffer pointers may be more efficient. | |
61 | */ | |
62 | enum { | |
63 | RC_NOCACHE, | |
64 | RC_REPLSTAT, | |
65 | RC_REPLBUFF, | |
66 | }; | |
67 | ||
68 | /* | |
69 | * If requests are retransmitted within this interval, they're dropped. | |
70 | */ | |
71 | #define RC_DELAY (HZ/5) | |
72 | ||
d5c3428b BF |
73 | int nfsd_reply_cache_init(void); |
74 | void nfsd_reply_cache_shutdown(void); | |
1da177e4 | 75 | int nfsd_cache_lookup(struct svc_rqst *, int); |
c7afef1f | 76 | void nfsd_cache_update(struct svc_rqst *, int, __be32 *); |
04826f43 BH |
77 | |
78 | #ifdef CONFIG_NFSD_V4 | |
074fe897 | 79 | void nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp); |
04826f43 BH |
80 | #else /* CONFIG_NFSD_V4 */ |
81 | static inline void nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp) | |
82 | { | |
83 | } | |
84 | #endif /* CONFIG_NFSD_V4 */ | |
1da177e4 | 85 | |
1da177e4 | 86 | #endif /* NFSCACHE_H */ |