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fs/nfsd/cache.h
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/* |
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* Request reply cache. This was heavily inspired by the * implementation in 4.3BSD/4.4BSD. * * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */ #ifndef NFSCACHE_H #define NFSCACHE_H |
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#include <linux/sunrpc/svc.h> |
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/* |
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* Representation of a reply cache entry. |
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* * Note that we use a sockaddr_in6 to hold the address instead of the more * typical sockaddr_storage. This is for space reasons, since sockaddr_storage * is much larger than a sockaddr_in6. |
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*/ struct svc_cacherep { |
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struct list_head c_lru; unsigned char c_state, /* unused, inprog, done */ c_type, /* status, buffer */ c_secure : 1; /* req came from port < 1024 */ |
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struct sockaddr_in6 c_addr; |
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__be32 c_xid; |
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u32 c_prot; u32 c_proc; u32 c_vers; |
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unsigned int c_len; __wsum c_csum; |
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unsigned long c_timestamp; union { struct kvec u_vec; |
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__be32 u_status; |
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} c_u; }; #define c_replvec c_u.u_vec #define c_replstat c_u.u_status /* cache entry states */ enum { RC_UNUSED, RC_INPROG, RC_DONE }; /* return values */ enum { RC_DROPIT, RC_REPLY, |
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RC_DOIT |
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}; /* * Cache types. * We may want to add more types one day, e.g. for diropres and * attrstat replies. Using cache entries with fixed length instead * of buffer pointers may be more efficient. */ enum { RC_NOCACHE, RC_REPLSTAT, RC_REPLBUFF, }; /* * If requests are retransmitted within this interval, they're dropped. */ #define RC_DELAY (HZ/5) |
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/* Cache entries expire after this time period */ #define RC_EXPIRE (120 * HZ) |
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/* Checksum this amount of the request */ #define RC_CSUMLEN (256U) |
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int nfsd_reply_cache_init(void); void nfsd_reply_cache_shutdown(void); |
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int nfsd_cache_lookup(struct svc_rqst *); |
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void nfsd_cache_update(struct svc_rqst *, int, __be32 *); |
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int nfsd_reply_cache_stats_open(struct inode *, struct file *); |
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#endif /* NFSCACHE_H */ |