4 * The kernel statd client.
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
9 #include <linux/types.h>
10 #include <linux/utsname.h>
11 #include <linux/kernel.h>
12 #include <linux/sunrpc/clnt.h>
13 #include <linux/sunrpc/svc.h>
14 #include <linux/lockd/lockd.h>
15 #include <linux/lockd/sm_inter.h>
18 #define NLMDBG_FACILITY NLMDBG_MONITOR
20 static struct rpc_clnt * nsm_create(void);
22 static struct rpc_program nsm_program;
30 * Common procedure for SM_MON/SM_UNMON calls
33 nsm_mon_unmon(struct nlm_host *host, u32 proc, struct nsm_res *res)
35 struct rpc_clnt *clnt;
38 struct rpc_message msg = {
45 status = PTR_ERR(clnt);
49 args.addr = host->h_addr.sin_addr.s_addr;
50 args.proto= (host->h_proto<<1) | host->h_server;
51 args.prog = NLM_PROGRAM;
52 args.vers = host->h_version;
53 args.proc = NLMPROC_NSM_NOTIFY;
54 memset(res, 0, sizeof(*res));
56 msg.rpc_proc = &clnt->cl_procinfo[proc];
57 status = rpc_call_sync(clnt, &msg, 0);
59 printk(KERN_DEBUG "nsm_mon_unmon: rpc failed, status=%d\n",
68 * Set up monitoring of a remote host
71 nsm_monitor(struct nlm_host *host)
76 dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
77 if (host->h_monitored)
80 status = nsm_mon_unmon(host, SM_MON, &res);
82 if (status < 0 || res.status != 0)
83 printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
85 host->h_monitored = 1;
90 * Cease to monitor remote host
93 nsm_unmonitor(struct nlm_host *host)
98 dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);
99 if (!host->h_monitored)
101 host->h_monitored = 0;
103 if (!host->h_killed) {
104 status = nsm_mon_unmon(host, SM_UNMON, &res);
106 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name);
112 * Create NSM client for the local host
114 static struct rpc_clnt *
117 struct sockaddr_in sin = {
118 .sin_family = AF_INET,
119 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
122 struct rpc_create_args args = {
123 .protocol = IPPROTO_UDP,
124 .address = (struct sockaddr *)&sin,
125 .addrsize = sizeof(sin),
126 .servername = "localhost",
127 .program = &nsm_program,
128 .version = SM_VERSION,
129 .authflavor = RPC_AUTH_NULL,
130 .flags = (RPC_CLNT_CREATE_ONESHOT),
133 return rpc_create(&args);
137 * XDR functions for NSM.
141 xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
146 * Use the dotted-quad IP address of the remote host as
147 * identifier. Linux statd always looks up the canonical
148 * hostname first for whatever remote hostname it receives,
149 * so this works alright.
151 sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr));
152 if (!(p = xdr_encode_string(p, buffer))
153 || !(p = xdr_encode_string(p, utsname()->nodename)))
154 return ERR_PTR(-EIO);
155 *p++ = htonl(argp->prog);
156 *p++ = htonl(argp->vers);
157 *p++ = htonl(argp->proc);
163 xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
165 p = xdr_encode_common(rqstp, p, argp);
172 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
177 xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
179 p = xdr_encode_common(rqstp, p, argp);
182 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
187 xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
189 resp->status = ntohl(*p++);
190 resp->state = ntohl(*p++);
191 dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
192 resp->status, resp->state);
197 xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
199 resp->state = ntohl(*p++);
203 #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
204 #define SM_my_id_sz (3+1+SM_my_name_sz)
205 #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz)
206 #define SM_mon_sz (SM_mon_id_sz+4)
207 #define SM_monres_sz 2
208 #define SM_unmonres_sz 1
211 # define MAX(a, b) (((a) > (b))? (a) : (b))
214 static struct rpc_procinfo nsm_procedures[] = {
217 .p_encode = (kxdrproc_t) xdr_encode_mon,
218 .p_decode = (kxdrproc_t) xdr_decode_stat_res,
219 .p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2,
225 .p_encode = (kxdrproc_t) xdr_encode_unmon,
226 .p_decode = (kxdrproc_t) xdr_decode_stat,
227 .p_bufsiz = MAX(SM_mon_id_sz, SM_unmonres_sz) << 2,
228 .p_statidx = SM_UNMON,
229 .p_name = "UNMONITOR",
233 static struct rpc_version nsm_version1 = {
235 .nrprocs = ARRAY_SIZE(nsm_procedures),
236 .procs = nsm_procedures
239 static struct rpc_version * nsm_version[] = {
243 static struct rpc_stat nsm_stats;
245 static struct rpc_program nsm_program = {
247 .number = SM_PROGRAM,
248 .nrvers = ARRAY_SIZE(nsm_version),
249 .version = nsm_version,