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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - fs/nfsd/cache.h
2 * Request reply cache. This was heavily inspired by the
3 * implementation in 4.3BSD/4.4BSD.
5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
11 #include <linux/sunrpc/svc.h>
14 * Representation of a reply cache entry.
16 * Note that we use a sockaddr_in6 to hold the address instead of the more
17 * typical sockaddr_storage. This is for space reasons, since sockaddr_storage
18 * is much larger than a sockaddr_in6.
21 struct hlist_node c_hash
;
22 struct list_head c_lru
;
24 unsigned char c_state
, /* unused, inprog, done */
25 c_type
, /* status, buffer */
26 c_secure
: 1; /* req came from port < 1024 */
27 struct sockaddr_in6 c_addr
;
34 unsigned long c_timestamp
;
41 #define c_replvec c_u.u_vec
42 #define c_replstat c_u.u_status
44 /* cache entry states */
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.
71 * If requests are retransmitted within this interval, they're dropped.
73 #define RC_DELAY (HZ/5)
75 /* Cache entries expire after this time period */
76 #define RC_EXPIRE (120 * HZ)
78 /* Checksum this amount of the request */
79 #define RC_CSUMLEN (256U)
81 int nfsd_reply_cache_init(void);
82 void nfsd_reply_cache_shutdown(void);
83 int nfsd_cache_lookup(struct svc_rqst
*);
84 void nfsd_cache_update(struct svc_rqst
*, int, __be32
*);
85 int nfsd_reply_cache_stats_open(struct inode
*, struct file
*);
87 #endif /* NFSCACHE_H */