1 /* 2 * linux/include/linux/sunrpc/svc.h 3 * 4 * RPC server declarations. 5 * 6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 7 */ 8 9 10 #ifndef SUNRPC_SVC_H 11 #define SUNRPC_SVC_H 12 13 #include <linux/in.h> 14 #include <linux/sunrpc/types.h> 15 #include <linux/sunrpc/xdr.h> 16 #include <linux/sunrpc/svcauth.h> 17 18 /* 19 * RPC service. 20 * 21 * An RPC service is a ``daemon,'' possibly multithreaded, which 22 * receives and processes incoming RPC messages. 23 * It has one or more transport sockets associated with it, and maintains 24 * a list of idle threads waiting for input. 25 * 26 * We currently do not support more than one RPC program per daemon. 27 */ 28 struct svc_serv { 29 struct list_head sv_threads; /* idle server threads */ 30 struct list_head sv_sockets; /* pending sockets */ 31 struct svc_program * sv_program; /* RPC program */ 32 struct svc_stat * sv_stats; /* RPC statistics */ 33 spinlock_t sv_lock; 34 unsigned int sv_nrthreads; /* # of server threads */ 35 unsigned int sv_bufsz; /* datagram buffer size */ 36 unsigned int sv_xdrsize; /* XDR buffer size */ 37 38 struct list_head sv_permsocks; /* all permanent sockets */ 39 struct list_head sv_tempsocks; /* all temporary sockets */ 40 int sv_tmpcnt; /* count of temporary sockets */ 41 42 char * sv_name; /* service name */ 43 }; 44 45 /* 46 * Maximum payload size supported by a kernel RPC server. 47 * This is use to determine the max number of pages nfsd is 48 * willing to return in a single READ operation. 49 */ 50 #define RPCSVC_MAXPAYLOAD 16384u 51 52 /* 53 * Buffer to store RPC requests or replies in. 54 * Each server thread has one of these beasts. 55 * 56 * Area points to the allocated memory chunk currently owned by the 57 * buffer. Base points to the buffer containing the request, which is 58 * different from area when directly reading from an sk_buff. buf is 59 * the current read/write position while processing an RPC request. 60 * 61 * The array of iovecs can hold additional data that the server process 62 * may not want to copy into the RPC reply buffer, but pass to the 63 * network sendmsg routines directly. The prime candidate for this 64 * will of course be NFS READ operations, but one might also want to 65 * do something about READLINK and READDIR. It might be worthwhile 66 * to implement some generic readdir cache in the VFS layer... 67 * 68 * On the receiving end of the RPC server, the iovec may be used to hold 69 * the list of IP fragments once we get to process fragmented UDP 70 * datagrams directly. 71 */ 72 #define RPCSVC_MAXIOV ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE + 1) 73 struct svc_buf { 74 u32 * area; /* allocated memory */ 75 u32 * base; /* base of RPC datagram */ 76 int buflen; /* total length of buffer */ 77 u32 * buf; /* read/write pointer */ 78 int len; /* current end of buffer */ 79 80 /* iovec for zero-copy NFS READs */ 81 struct iovec iov[RPCSVC_MAXIOV]; 82 int nriov; 83 }; 84 #define svc_getlong(argp, val) { (val) = *(argp)->buf++; (argp)->len--; } 85 #define svc_putlong(resp, val) { *(resp)->buf++ = (val); (resp)->len++; } 86 87 /* 88 * The context of a single thread, including the request currently being 89 * processed. 90 * NOTE: First two items must be prev/next. 91 */ 92 struct svc_rqst { 93 struct list_head rq_list; /* idle list */ 94 struct svc_sock * rq_sock; /* socket */ 95 struct sockaddr_in rq_addr; /* peer address */ 96 int rq_addrlen; 97 98 struct svc_serv * rq_server; /* RPC service definition */ 99 struct svc_procedure * rq_procinfo; /* procedure info */ 100 struct svc_cred rq_cred; /* auth info */ 101 struct sk_buff * rq_skbuff; /* fast recv inet buffer */ 102 struct svc_buf rq_defbuf; /* default buffer */ 103 struct svc_buf rq_argbuf; /* argument buffer */ 104 struct svc_buf rq_resbuf; /* result buffer */ 105 u32 rq_xid; /* transmission id */ 106 u32 rq_prog; /* program number */ 107 u32 rq_vers; /* program version */ 108 u32 rq_proc; /* procedure number */ 109 u32 rq_prot; /* IP protocol */ 110 unsigned short rq_verfed : 1, /* reply has verifier */ 111 rq_userset : 1, /* auth->setuser OK */ 112 rq_secure : 1, /* secure port */ 113 rq_auth : 1; /* check client */ 114 115 __u32 rq_daddr; /* dest addr of request - reply from here */ 116 117 void * rq_argp; /* decoded arguments */ 118 void * rq_resp; /* xdr'd results */ 119 120 int rq_reserved; /* space on socket outq 121 * reserved for this request 122 */ 123 124 /* Catering to nfsd */ 125 struct svc_client * rq_client; /* RPC peer info */ 126 struct svc_cacherep * rq_cacherep; /* cache info */ 127 struct knfsd_fh * rq_reffh; /* Referrence filehandle, used to 128 * determine what device number 129 * to report (real or virtual) 130 */ 131 132 wait_queue_head_t rq_wait; /* synchronozation */ 133 }; 134 135 /* 136 * RPC program 137 */ 138 struct svc_program { 139 u32 pg_prog; /* program number */ 140 unsigned int pg_lovers; /* lowest version */ 141 unsigned int pg_hivers; /* lowest version */ 142 unsigned int pg_nvers; /* number of versions */ 143 struct svc_version ** pg_vers; /* version array */ 144 char * pg_name; /* service name */ 145 struct svc_stat * pg_stats; /* rpc statistics */ 146 }; 147 148 /* 149 * RPC program version 150 */ 151 struct svc_version { 152 u32 vs_vers; /* version number */ 153 u32 vs_nproc; /* number of procedures */ 154 struct svc_procedure * vs_proc; /* per-procedure info */ 155 156 /* Override dispatch function (e.g. when caching replies). 157 * A return value of 0 means drop the request. 158 * vs_dispatch == NULL means use default dispatcher. 159 */ 160 int (*vs_dispatch)(struct svc_rqst *, u32 *); 161 }; 162 163 /* 164 * RPC procedure info 165 */ 166 typedef int (*svc_procfunc)(struct svc_rqst *, void *argp, void *resp); 167 struct svc_procedure { 168 svc_procfunc pc_func; /* process the request */ 169 kxdrproc_t pc_decode; /* XDR decode args */ 170 kxdrproc_t pc_encode; /* XDR encode result */ 171 kxdrproc_t pc_release; /* XDR free result */ 172 unsigned int pc_argsize; /* argument struct size */ 173 unsigned int pc_ressize; /* result struct size */ 174 unsigned int pc_count; /* call count */ 175 unsigned int pc_cachetype; /* cache info (NFS) */ 176 unsigned int pc_xdrressize; /* maximum size of XDR reply */ 177 }; 178 179 /* 180 * This is the RPC server thread function prototype 181 */ 182 typedef void (*svc_thread_fn)(struct svc_rqst *); 183 184 /* 185 * Function prototypes. 186 */ 187 struct svc_serv * svc_create(struct svc_program *, unsigned int, unsigned int); 188 int svc_create_thread(svc_thread_fn, struct svc_serv *); 189 void svc_exit_thread(struct svc_rqst *); 190 void svc_destroy(struct svc_serv *); 191 int svc_process(struct svc_serv *, struct svc_rqst *); 192 int svc_register(struct svc_serv *, int, unsigned short); 193 void svc_wake_up(struct svc_serv *); 194 void svc_reserve(struct svc_rqst *rqstp, int space); 195 196 #endif /* SUNRPC_SVC_H */ 197