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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 423 | giacomo | 1 | /* |
| 2 | * include/linux/nfsd/cache.h |
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| 3 | * |
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| 4 | * Request reply cache. This was heavily inspired by the |
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| 5 | * implementation in 4.3BSD/4.4BSD. |
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| 6 | * |
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| 7 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> |
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| 8 | */ |
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| 9 | |||
| 10 | #ifndef NFSCACHE_H |
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| 11 | #define NFSCACHE_H |
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| 12 | |||
| 13 | #ifdef __KERNEL__ |
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| 14 | #include <linux/in.h> |
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| 15 | #include <linux/uio.h> |
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| 16 | |||
| 17 | /* |
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| 18 | * Representation of a reply cache entry. The first two members *must* |
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| 19 | * be hash_next and hash_prev. |
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| 20 | */ |
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| 21 | struct svc_cacherep { |
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| 22 | struct svc_cacherep * c_hash_next; |
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| 23 | struct svc_cacherep * c_hash_prev; |
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| 24 | struct svc_cacherep * c_lru_next; |
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| 25 | struct svc_cacherep * c_lru_prev; |
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| 26 | unsigned char c_state, /* unused, inprog, done */ |
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| 27 | c_type, /* status, buffer */ |
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| 28 | c_secure : 1; /* req came from port < 1024 */ |
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| 29 | struct sockaddr_in c_addr; |
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| 30 | u32 c_xid; |
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| 31 | u32 c_prot; |
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| 32 | u32 c_proc; |
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| 33 | u32 c_vers; |
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| 34 | unsigned long c_timestamp; |
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| 35 | union { |
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| 36 | struct iovec u_vec; |
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| 37 | u32 u_status; |
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| 38 | } c_u; |
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| 39 | }; |
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| 40 | |||
| 41 | #define c_replvec c_u.u_vec |
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| 42 | #define c_replstat c_u.u_status |
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| 43 | |||
| 44 | /* cache entry states */ |
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| 45 | enum { |
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| 46 | RC_UNUSED, |
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| 47 | RC_INPROG, |
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| 48 | RC_DONE |
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| 49 | }; |
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| 50 | |||
| 51 | /* return values */ |
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| 52 | enum { |
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| 53 | RC_DROPIT, |
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| 54 | RC_REPLY, |
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| 55 | RC_DOIT, |
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| 56 | RC_INTR |
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| 57 | }; |
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| 58 | |||
| 59 | /* |
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| 60 | * Cache types. |
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| 61 | * We may want to add more types one day, e.g. for diropres and |
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| 62 | * attrstat replies. Using cache entries with fixed length instead |
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| 63 | * of buffer pointers may be more efficient. |
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| 64 | */ |
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| 65 | enum { |
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| 66 | RC_NOCACHE, |
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| 67 | RC_REPLSTAT, |
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| 68 | RC_REPLBUFF, |
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| 69 | }; |
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| 70 | |||
| 71 | /* |
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| 72 | * If requests are retransmitted within this interval, they're dropped. |
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| 73 | */ |
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| 74 | #define RC_DELAY (HZ/5) |
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| 75 | |||
| 76 | void nfsd_cache_init(void); |
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| 77 | void nfsd_cache_shutdown(void); |
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| 78 | int nfsd_cache_lookup(struct svc_rqst *, int); |
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| 79 | void nfsd_cache_update(struct svc_rqst *, int, u32 *); |
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| 80 | |||
| 81 | #endif /* __KERNEL__ */ |
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| 82 | #endif /* NFSCACHE_H */ |