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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 | ||
13 | #ifdef __KERNEL__ | |
14 | #include <linux/in.h> | |
15 | #include <linux/uio.h> | |
16 | ||
17 | /* | |
18 | * Representation of a reply cache entry. The first two members *must* | |
19 | * be hash_next and hash_prev. | |
20 | */ | |
21 | struct svc_cacherep { | |
22 | struct hlist_node c_hash; | |
23 | struct list_head c_lru; | |
24 | ||
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; | |
c7afef1f | 29 | __be32 c_xid; |
1da177e4 LT |
30 | u32 c_prot; |
31 | u32 c_proc; | |
32 | u32 c_vers; | |
33 | unsigned long c_timestamp; | |
34 | union { | |
35 | struct kvec u_vec; | |
c7afef1f | 36 | __be32 u_status; |
1da177e4 LT |
37 | } c_u; |
38 | }; | |
39 | ||
40 | #define c_replvec c_u.u_vec | |
41 | #define c_replstat c_u.u_status | |
42 | ||
43 | /* cache entry states */ | |
44 | enum { | |
45 | RC_UNUSED, | |
46 | RC_INPROG, | |
47 | RC_DONE | |
48 | }; | |
49 | ||
50 | /* return values */ | |
51 | enum { | |
52 | RC_DROPIT, | |
53 | RC_REPLY, | |
54 | RC_DOIT, | |
55 | RC_INTR | |
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 | */ | |
64 | enum { | |
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 | void nfsd_cache_init(void); | |
76 | void nfsd_cache_shutdown(void); | |
77 | int nfsd_cache_lookup(struct svc_rqst *, int); | |
c7afef1f | 78 | void nfsd_cache_update(struct svc_rqst *, int, __be32 *); |
1da177e4 LT |
79 | |
80 | #endif /* __KERNEL__ */ | |
81 | #endif /* NFSCACHE_H */ |