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 nsm_handle *nsm, u32 proc, struct nsm_res *res)
35 struct rpc_clnt *clnt;
38 struct rpc_message msg = {
45 status = PTR_ERR(clnt);
49 memset(&args, 0, sizeof(args));
50 args.addr = nsm->sm_addr.sin_addr.s_addr;
51 args.prog = NLM_PROGRAM;
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)
73 struct nsm_handle *nsm = host->h_nsmhandle;
77 dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
80 if (nsm->sm_monitored)
83 status = nsm_mon_unmon(nsm, SM_MON, &res);
85 if (status < 0 || res.status != 0)
86 printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
88 nsm->sm_monitored = 1;
93 * Cease to monitor remote host
96 nsm_unmonitor(struct nlm_host *host)
98 struct nsm_handle *nsm = host->h_nsmhandle;
104 host->h_nsmhandle = NULL;
106 if (atomic_read(&nsm->sm_count) == 1
107 && nsm->sm_monitored && !nsm->sm_sticky) {
108 dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);
110 status = nsm_mon_unmon(nsm, SM_UNMON, &res);
112 printk(KERN_NOTICE "lockd: cannot unmonitor %s\n",
115 nsm->sm_monitored = 0;
122 * Create NSM client for the local host
124 static struct rpc_clnt *
127 struct sockaddr_in sin = {
128 .sin_family = AF_INET,
129 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
132 struct rpc_create_args args = {
133 .protocol = IPPROTO_UDP,
134 .address = (struct sockaddr *)&sin,
135 .addrsize = sizeof(sin),
136 .servername = "localhost",
137 .program = &nsm_program,
138 .version = SM_VERSION,
139 .authflavor = RPC_AUTH_NULL,
140 .flags = (RPC_CLNT_CREATE_ONESHOT),
143 return rpc_create(&args);
147 * XDR functions for NSM.
151 xdr_encode_common(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
156 * Use the dotted-quad IP address of the remote host as
157 * identifier. Linux statd always looks up the canonical
158 * hostname first for whatever remote hostname it receives,
159 * so this works alright.
161 sprintf(buffer, "%u.%u.%u.%u", NIPQUAD(argp->addr));
162 if (!(p = xdr_encode_string(p, buffer))
163 || !(p = xdr_encode_string(p, utsname()->nodename)))
164 return ERR_PTR(-EIO);
165 *p++ = htonl(argp->prog);
166 *p++ = htonl(argp->vers);
167 *p++ = htonl(argp->proc);
173 xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
175 p = xdr_encode_common(rqstp, p, argp);
179 /* Surprise - there may even be room for an IPv6 address now */
184 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
189 xdr_encode_unmon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
191 p = xdr_encode_common(rqstp, p, argp);
194 rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
199 xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
201 resp->status = ntohl(*p++);
202 resp->state = ntohl(*p++);
203 dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
204 resp->status, resp->state);
209 xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
211 resp->state = ntohl(*p++);
215 #define SM_my_name_sz (1+XDR_QUADLEN(SM_MAXSTRLEN))
216 #define SM_my_id_sz (3+1+SM_my_name_sz)
217 #define SM_mon_id_sz (1+XDR_QUADLEN(20)+SM_my_id_sz)
218 #define SM_mon_sz (SM_mon_id_sz+4)
219 #define SM_monres_sz 2
220 #define SM_unmonres_sz 1
223 # define MAX(a, b) (((a) > (b))? (a) : (b))
226 static struct rpc_procinfo nsm_procedures[] = {
229 .p_encode = (kxdrproc_t) xdr_encode_mon,
230 .p_decode = (kxdrproc_t) xdr_decode_stat_res,
231 .p_bufsiz = MAX(SM_mon_sz, SM_monres_sz) << 2,
237 .p_encode = (kxdrproc_t) xdr_encode_unmon,
238 .p_decode = (kxdrproc_t) xdr_decode_stat,
239 .p_bufsiz = MAX(SM_mon_id_sz, SM_unmonres_sz) << 2,
240 .p_statidx = SM_UNMON,
241 .p_name = "UNMONITOR",
245 static struct rpc_version nsm_version1 = {
247 .nrprocs = ARRAY_SIZE(nsm_procedures),
248 .procs = nsm_procedures
251 static struct rpc_version * nsm_version[] = {
255 static struct rpc_stat nsm_stats;
257 static struct rpc_program nsm_program = {
259 .number = SM_PROGRAM,
260 .nrvers = ARRAY_SIZE(nsm_version),
261 .version = nsm_version,