1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 29a74af21SBoaz Harrosh /* 39a74af21SBoaz Harrosh * Request reply cache. This was heavily inspired by the 49a74af21SBoaz Harrosh * implementation in 4.3BSD/4.4BSD. 59a74af21SBoaz Harrosh * 69a74af21SBoaz Harrosh * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 79a74af21SBoaz Harrosh */ 89a74af21SBoaz Harrosh 99a74af21SBoaz Harrosh #ifndef NFSCACHE_H 109a74af21SBoaz Harrosh #define NFSCACHE_H 119a74af21SBoaz Harrosh 129a74af21SBoaz Harrosh #include <linux/sunrpc/svc.h> 133ba75830SJ. Bruce Fields #include "netns.h" 149a74af21SBoaz Harrosh 159a74af21SBoaz Harrosh /* 169a74af21SBoaz Harrosh * Representation of a reply cache entry. 177b9e8522SJeff Layton * 187b9e8522SJeff Layton * Note that we use a sockaddr_in6 to hold the address instead of the more 197b9e8522SJeff Layton * typical sockaddr_storage. This is for space reasons, since sockaddr_storage 207b9e8522SJeff Layton * is much larger than a sockaddr_in6. 219a74af21SBoaz Harrosh */ 22e7421ce7SChuck Lever struct nfsd_cacherep { 23ed00c2f6STrond Myklebust struct { 24ed00c2f6STrond Myklebust /* Keep often-read xid, csum in the same cache line: */ 25ed00c2f6STrond Myklebust __be32 k_xid; 26ed00c2f6STrond Myklebust __wsum k_csum; 27ed00c2f6STrond Myklebust u32 k_proc; 28ed00c2f6STrond Myklebust u32 k_prot; 29ed00c2f6STrond Myklebust u32 k_vers; 30ed00c2f6STrond Myklebust unsigned int k_len; 31ed00c2f6STrond Myklebust struct sockaddr_in6 k_addr; 32ed00c2f6STrond Myklebust } c_key; 339a74af21SBoaz Harrosh 34736c6625STrond Myklebust struct rb_node c_node; 35ed00c2f6STrond Myklebust struct list_head c_lru; 369a74af21SBoaz Harrosh unsigned char c_state, /* unused, inprog, done */ 379a74af21SBoaz Harrosh c_type, /* status, buffer */ 389a74af21SBoaz Harrosh c_secure : 1; /* req came from port < 1024 */ 399a74af21SBoaz Harrosh unsigned long c_timestamp; 409a74af21SBoaz Harrosh union { 419a74af21SBoaz Harrosh struct kvec u_vec; 429a74af21SBoaz Harrosh __be32 u_status; 439a74af21SBoaz Harrosh } c_u; 449a74af21SBoaz Harrosh }; 459a74af21SBoaz Harrosh 469a74af21SBoaz Harrosh #define c_replvec c_u.u_vec 479a74af21SBoaz Harrosh #define c_replstat c_u.u_status 489a74af21SBoaz Harrosh 499a74af21SBoaz Harrosh /* cache entry states */ 509a74af21SBoaz Harrosh enum { 519a74af21SBoaz Harrosh RC_UNUSED, 529a74af21SBoaz Harrosh RC_INPROG, 539a74af21SBoaz Harrosh RC_DONE 549a74af21SBoaz Harrosh }; 559a74af21SBoaz Harrosh 569a74af21SBoaz Harrosh /* return values */ 579a74af21SBoaz Harrosh enum { 589a74af21SBoaz Harrosh RC_DROPIT, 599a74af21SBoaz Harrosh RC_REPLY, 6009662d58SJeff Layton RC_DOIT 619a74af21SBoaz Harrosh }; 629a74af21SBoaz Harrosh 639a74af21SBoaz Harrosh /* 649a74af21SBoaz Harrosh * Cache types. 659a74af21SBoaz Harrosh * We may want to add more types one day, e.g. for diropres and 669a74af21SBoaz Harrosh * attrstat replies. Using cache entries with fixed length instead 679a74af21SBoaz Harrosh * of buffer pointers may be more efficient. 689a74af21SBoaz Harrosh */ 699a74af21SBoaz Harrosh enum { 709a74af21SBoaz Harrosh RC_NOCACHE, 719a74af21SBoaz Harrosh RC_REPLSTAT, 729a74af21SBoaz Harrosh RC_REPLBUFF, 739a74af21SBoaz Harrosh }; 749a74af21SBoaz Harrosh 75d1a0774dSJeff Layton /* Cache entries expire after this time period */ 76d1a0774dSJeff Layton #define RC_EXPIRE (120 * HZ) 77d1a0774dSJeff Layton 7801a7decfSJeff Layton /* Checksum this amount of the request */ 7901a7decfSJeff Layton #define RC_CSUMLEN (256U) 8001a7decfSJeff Layton 81027690c7SJ. Bruce Fields int nfsd_drc_slab_create(void); 82027690c7SJ. Bruce Fields void nfsd_drc_slab_free(void); 83ed9ab734SJeff Layton int nfsd_net_reply_cache_init(struct nfsd_net *nn); 84ed9ab734SJeff Layton void nfsd_net_reply_cache_destroy(struct nfsd_net *nn); 853ba75830SJ. Bruce Fields int nfsd_reply_cache_init(struct nfsd_net *); 863ba75830SJ. Bruce Fields void nfsd_reply_cache_shutdown(struct nfsd_net *); 87*b79e3569SChuck Lever int nfsd_cache_lookup(struct svc_rqst *rqstp, unsigned int start, 88*b79e3569SChuck Lever unsigned int len, struct nfsd_cacherep **cacherep); 89e7421ce7SChuck Lever void nfsd_cache_update(struct svc_rqst *rqstp, struct nfsd_cacherep *rp, 90cb18eca4SChuck Lever int cachetype, __be32 *statp); 9164776611SChenXiaoSong int nfsd_reply_cache_stats_show(struct seq_file *m, void *v); 929a74af21SBoaz Harrosh 939a74af21SBoaz Harrosh #endif /* NFSCACHE_H */ 94