patch-2.1.32 linux/fs/lockd/mon.c

• Lines: 229
• Date: Fri Apr 4 12:21:59 1997
• Orig file: v2.1.31/linux/fs/lockd/mon.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/fs/lockd/mon.c linux/fs/lockd/mon.c
@@ -0,0 +1,228 @@
+/*
+ * linux/fs/lockd/mon.c
+ *
+ * The kernel statd client.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/utsname.h>
+#include <linux/kernel.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/lockd/lockd.h>
+#include <linux/lockd/sm_inter.h>
+
+
+#define NLMDBG_FACILITY		NLMDBG_MONITOR
+
+static struct rpc_clnt *	nsm_create(void);
+
+extern struct rpc_program	nsm_program;
+
+/*
+ * Local NSM state
+ */
+u32				nsm_local_state = 0;
+
+/*
+ * Common procedure for SM_MON/SM_UNMON calls
+ */
+static int
+nsm_mon_unmon(struct nlm_host *host, char *what, u32 proc)
+{
+	struct rpc_clnt	*clnt;
+	struct nsm_args	args;
+	struct nsm_res	res;
+	int		status;
+
+	dprintk("lockd: nsm_%s(%s)\n", what, host->h_name);
+	if (!(clnt = nsm_create()))
+		return -EACCES;
+
+	args.addr = host->h_addr.sin_addr.s_addr;
+	args.prog = NLM_PROGRAM;
+	args.vers = 1;
+	args.proc = NLMPROC_NSM_NOTIFY;
+
+	if ((status = rpc_call(clnt, proc, &args, &res, 0)) < 0)
+		return status;
+
+	if (res.status != 0) {
+		printk(KERN_NOTICE "lockd: cannot %s %s\n", what, host->h_name);
+		return -EACCES;
+	}
+
+	nsm_local_state = res.state;
+	return 0;
+}
+
+/*
+ * Set up monitoring of a remote host
+ */
+int
+nsm_monitor(struct nlm_host *host)
+{
+	int		status;
+
+	if ((status = nsm_mon_unmon(host, "monitor", SM_MON)) >= 0)
+		host->h_monitored = 1;
+	return status;
+}
+
+/*
+ * Cease to monitor remote host
+ */
+int
+nsm_unmonitor(struct nlm_host *host)
+{
+	int		status;
+
+	if ((status = nsm_mon_unmon(host, "unmonitor", SM_UNMON)) >= 0)
+		host->h_monitored = 0;
+	return status;
+}
+
+/*
+ * Create NSM client for the local host
+ */
+static struct rpc_clnt *
+nsm_create(void)
+{
+	struct sockaddr_in	sin;
+	struct rpc_xprt		*xprt;
+	struct rpc_clnt		*clnt;
+
+	sin.sin_family = AF_INET;
+	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+	sin.sin_port = 0;
+
+	if (!(xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL)))
+		return NULL;
+
+	clnt = rpc_create_client(xprt, "localhost",
+				&nsm_program, SM_VERSION,
+				RPC_AUTH_NULL);
+	if (!clnt) {
+		xprt_destroy(xprt);
+	} else {
+		clnt->cl_softrtry = 1;
+		clnt->cl_chatty   = 1;
+		clnt->cl_oneshot  = 1;
+	}
+	return clnt;
+}
+
+/*
+ * XDR functions for NSM.
+ */
+static int
+xdr_error(struct rpc_rqst *rqstp, u32 *p, void *dummy)
+{
+	return -EACCES;
+}
+
+static int
+xdr_encode_mon(struct rpc_rqst *rqstp, u32 *p, struct nsm_args *argp)
+{
+	char	buffer[20];
+	u32	addr = ntohl(argp->addr);
+
+	dprintk("nsm: xdr_encode_mon(%08lx, %ld, %ld, %ld)\n",
+			htonl(argp->addr), htonl(argp->proc),
+			htonl(argp->vers), htonl(argp->proc));
+
+	/*
+	 * Use the dotted-quad IP address of the remote host as
+	 * identifier. Linux statd always looks up the canonical
+	 * hostname first for whatever remote hostname it receives,
+	 * so this works alright.
+	 */
+	sprintf(buffer, "%d.%d.%d.%d", (addr>>24) & 0xff, (addr>>16) & 0xff,
+				 	(addr>>8) & 0xff,  (addr) & 0xff);
+	if (!(p = xdr_encode_string(p, buffer))
+	 || !(p = xdr_encode_string(p, system_utsname.nodename)))
+		return -EIO;
+	*p++ = htonl(argp->prog);
+	*p++ = htonl(argp->vers);
+	*p++ = htonl(argp->proc);
+
+	/* This is the private part. Needed only for SM_MON call */
+	if (rqstp->rq_task->tk_proc == SM_MON) {
+		*p++ = argp->addr;
+		*p++ = 0;
+		*p++ = 0;
+		*p++ = 0;
+	}
+
+	rqstp->rq_slen = xdr_adjust_iovec(rqstp->rq_svec, p);
+	return 0;
+}
+
+static int
+xdr_decode_stat_res(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
+{
+	resp->status = ntohl(*p++);
+	resp->state = ntohl(*p++);
+	dprintk("nsm: xdr_decode_stat_res status %d state %d\n",
+			resp->status, resp->state);
+	return 0;
+}
+
+static int
+xdr_decode_stat(struct rpc_rqst *rqstp, u32 *p, struct nsm_res *resp)
+{
+	resp->status = ntohl(*p++);
+	return 0;
+}
+
+#define SM_my_name_sz	(1+XDR_QUADLEN(SM_MAXSTRLEN))
+#define SM_my_id_sz	(3+1+SM_my_name_sz)
+#define SM_mon_id_sz	(1+XDR_QUADLEN(20)+SM_my_id_sz)
+#define SM_mon_sz	(SM_mon_id_sz+4)
+
+static struct rpc_procinfo	nsm_procedures[] = {
+        { "sm_null",
+		(kxdrproc_t) xdr_error,
+		(kxdrproc_t) xdr_error, 0, 0 },
+        { "sm_stat",
+		(kxdrproc_t) xdr_error,
+		(kxdrproc_t) xdr_error, 0, 0 },
+        { "sm_mon",
+		(kxdrproc_t) xdr_encode_mon,
+		(kxdrproc_t) xdr_decode_stat_res, SM_mon_sz, 2 },
+        { "sm_unmon",
+		(kxdrproc_t) xdr_encode_mon,
+		(kxdrproc_t) xdr_decode_stat, SM_mon_id_sz, 1 },
+        { "sm_unmon_all",
+		(kxdrproc_t) xdr_error,
+		(kxdrproc_t) xdr_error, 0, 0 },
+        { "sm_simu_crash",
+		(kxdrproc_t) xdr_error,
+		(kxdrproc_t) xdr_error, 0, 0 },
+        { "sm_notify",
+		(kxdrproc_t) xdr_error,
+		(kxdrproc_t) xdr_error, 0, 0 },
+};
+
+static struct rpc_version	nsm_version1 = {
+	1, 
+	sizeof(nsm_procedures)/sizeof(nsm_procedures[0]),
+	nsm_procedures
+};
+
+static struct rpc_version *	nsm_version[] = {
+	NULL,
+	&nsm_version1,
+};
+
+static struct rpc_stat		nsm_stats;
+
+struct rpc_program		nsm_program = {
+	"statd",
+	SM_PROGRAM,
+	sizeof(nsm_version)/sizeof(nsm_version[0]),
+	nsm_version,
+	&nsm_stats
+};