1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Request reply cache. This was heavily inspired by the 4*4882a593Smuzhiyun * implementation in 4.3BSD/4.4BSD. 5*4882a593Smuzhiyun * 6*4882a593Smuzhiyun * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #ifndef NFSCACHE_H 10*4882a593Smuzhiyun #define NFSCACHE_H 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #include <linux/sunrpc/svc.h> 13*4882a593Smuzhiyun #include "netns.h" 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun /* 16*4882a593Smuzhiyun * Representation of a reply cache entry. 17*4882a593Smuzhiyun * 18*4882a593Smuzhiyun * Note that we use a sockaddr_in6 to hold the address instead of the more 19*4882a593Smuzhiyun * typical sockaddr_storage. This is for space reasons, since sockaddr_storage 20*4882a593Smuzhiyun * is much larger than a sockaddr_in6. 21*4882a593Smuzhiyun */ 22*4882a593Smuzhiyun struct svc_cacherep { 23*4882a593Smuzhiyun struct { 24*4882a593Smuzhiyun /* Keep often-read xid, csum in the same cache line: */ 25*4882a593Smuzhiyun __be32 k_xid; 26*4882a593Smuzhiyun __wsum k_csum; 27*4882a593Smuzhiyun u32 k_proc; 28*4882a593Smuzhiyun u32 k_prot; 29*4882a593Smuzhiyun u32 k_vers; 30*4882a593Smuzhiyun unsigned int k_len; 31*4882a593Smuzhiyun struct sockaddr_in6 k_addr; 32*4882a593Smuzhiyun } c_key; 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun struct rb_node c_node; 35*4882a593Smuzhiyun struct list_head c_lru; 36*4882a593Smuzhiyun unsigned char c_state, /* unused, inprog, done */ 37*4882a593Smuzhiyun c_type, /* status, buffer */ 38*4882a593Smuzhiyun c_secure : 1; /* req came from port < 1024 */ 39*4882a593Smuzhiyun unsigned long c_timestamp; 40*4882a593Smuzhiyun union { 41*4882a593Smuzhiyun struct kvec u_vec; 42*4882a593Smuzhiyun __be32 u_status; 43*4882a593Smuzhiyun } c_u; 44*4882a593Smuzhiyun }; 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun #define c_replvec c_u.u_vec 47*4882a593Smuzhiyun #define c_replstat c_u.u_status 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun /* cache entry states */ 50*4882a593Smuzhiyun enum { 51*4882a593Smuzhiyun RC_UNUSED, 52*4882a593Smuzhiyun RC_INPROG, 53*4882a593Smuzhiyun RC_DONE 54*4882a593Smuzhiyun }; 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun /* return values */ 57*4882a593Smuzhiyun enum { 58*4882a593Smuzhiyun RC_DROPIT, 59*4882a593Smuzhiyun RC_REPLY, 60*4882a593Smuzhiyun RC_DOIT 61*4882a593Smuzhiyun }; 62*4882a593Smuzhiyun 63*4882a593Smuzhiyun /* 64*4882a593Smuzhiyun * Cache types. 65*4882a593Smuzhiyun * We may want to add more types one day, e.g. for diropres and 66*4882a593Smuzhiyun * attrstat replies. Using cache entries with fixed length instead 67*4882a593Smuzhiyun * of buffer pointers may be more efficient. 68*4882a593Smuzhiyun */ 69*4882a593Smuzhiyun enum { 70*4882a593Smuzhiyun RC_NOCACHE, 71*4882a593Smuzhiyun RC_REPLSTAT, 72*4882a593Smuzhiyun RC_REPLBUFF, 73*4882a593Smuzhiyun }; 74*4882a593Smuzhiyun 75*4882a593Smuzhiyun /* Cache entries expire after this time period */ 76*4882a593Smuzhiyun #define RC_EXPIRE (120 * HZ) 77*4882a593Smuzhiyun 78*4882a593Smuzhiyun /* Checksum this amount of the request */ 79*4882a593Smuzhiyun #define RC_CSUMLEN (256U) 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun int nfsd_drc_slab_create(void); 82*4882a593Smuzhiyun void nfsd_drc_slab_free(void); 83*4882a593Smuzhiyun int nfsd_reply_cache_init(struct nfsd_net *); 84*4882a593Smuzhiyun void nfsd_reply_cache_shutdown(struct nfsd_net *); 85*4882a593Smuzhiyun int nfsd_cache_lookup(struct svc_rqst *); 86*4882a593Smuzhiyun void nfsd_cache_update(struct svc_rqst *, int, __be32 *); 87*4882a593Smuzhiyun int nfsd_reply_cache_stats_open(struct inode *, struct file *); 88*4882a593Smuzhiyun 89*4882a593Smuzhiyun #endif /* NFSCACHE_H */ 90