/* * Request reply cache. This was heavily inspired by the * implementation in 4.3BSD/4.4BSD. * * Copyright (C) 1995, 1996 Olaf Kirch */ #ifndef NFSCACHE_H #define NFSCACHE_H #include /* * Representation of a reply cache entry. * * 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. */ struct svc_cacherep { struct list_head c_lru; unsigned char c_state, /* unused, inprog, done */ c_type, /* status, buffer */ c_secure : 1; /* req came from port < 1024 */ struct sockaddr_in6 c_addr; __be32 c_xid; u32 c_prot; u32 c_proc; u32 c_vers; unsigned int c_len; __wsum c_csum; unsigned long c_timestamp; union { struct kvec u_vec; __be32 u_status; } 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, RC_DOIT }; /* * 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) /* Cache entries expire after this time period */ #define RC_EXPIRE (120 * HZ) /* Checksum this amount of the request */ #define RC_CSUMLEN (256U) int nfsd_reply_cache_init(void); void nfsd_reply_cache_shutdown(void); int nfsd_cache_lookup(struct svc_rqst *); void nfsd_cache_update(struct svc_rqst *, int, __be32 *); int nfsd_reply_cache_stats_open(struct inode *, struct file *); #endif /* NFSCACHE_H */ -next.git/tree/net/ipv4/ip_vti.c?h=nds-private-remove&id=5aff1d245e8cc1ab5c4517d916edaed9e3f7f973'>treecommit diff

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