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| 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 | struct 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 */ |
| 39 | enum { |
| 40 | RC_UNUSED, |
| 41 | RC_INPROG, |
| 42 | RC_DONE |
| 43 | }; |
| 44 | |
| 45 | /* return values */ |
| 46 | enum { |
| 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 | */ |
| 59 | enum { |
| 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 | |
| 70 | int nfsd_reply_cache_init(void); |
| 71 | void nfsd_reply_cache_shutdown(void); |
| 72 | int nfsd_cache_lookup(struct svc_rqst *, int); |
| 73 | void nfsd_cache_update(struct svc_rqst *, int, __be32 *); |
| 74 | |
| 75 | #ifdef CONFIG_NFSD_V4 |
| 76 | void nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp); |
| 77 | #else /* CONFIG_NFSD_V4 */ |
| 78 | static inline void nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp) |
| 79 | { |
| 80 | } |
| 81 | #endif /* CONFIG_NFSD_V4 */ |
| 82 | |
| 83 | #endif /* NFSCACHE_H */ |
| 84 |
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