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

• Lines: 285
• Date: Fri Apr 4 12:47:07 1997
• Orig file: v2.1.31/linux/fs/lockd/svc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/fs/lockd/svc.c linux/fs/lockd/svc.c
@@ -0,0 +1,284 @@
+/*
+ * linux/fs/lockd/svc.c
+ *
+ * This is the central lockd service.
+ *
+ * FIXME: Separate the lockd NFS server functionality from the lockd NFS
+ * 	  client functionality. Oh why didn't Sun create two separate
+ *	  services in the first place?
+ *
+ * Authors:	Olaf Kirch (okir@monad.swb.de)
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#define __KERNEL_SYSCALLS__
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/nfs.h>
+#include <linux/in.h>
+#include <linux/uio.h>
+#include <linux/version.h>
+#include <linux/unistd.h>
+#include <linux/malloc.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/lockd/lockd.h>
+
+
+#define NLMDBG_FACILITY		NLMDBG_SVC
+#define LOCKD_BUFSIZE		(1024 + NLMSSVC_XDRSIZE)
+#define BLOCKABLE_SIGS		(~(_S(SIGKILL) | _S(SIGSTOP)))
+#define _S(sig)			(1 << ((sig) - 1))
+
+extern struct svc_program	nlmsvc_program;
+struct nlmsvc_binding *		nlmsvc_ops = NULL;
+static int			nlmsvc_sema = 0;
+static int			nlmsvc_pid = 0;
+unsigned long			nlmsvc_grace_period = 0;
+unsigned long			nlmsvc_timeout = 0;
+
+/*
+ * Currently the following can be set only at insmod time.
+ * Ideally, they would be accessible through the sysctl interface.
+ */
+unsigned long			nlm_grace_period = 0;
+unsigned long			nlm_timeout = LOCKD_DFLT_TIMEO;
+
+/*
+ * This is the lockd kernel thread
+ */
+static void
+lockd(struct svc_rqst *rqstp)
+{
+	struct svc_serv	*serv = rqstp->rq_server;
+	sigset_t	oldsigmask;
+	int		err = 0;
+
+	lock_kernel();
+	/* Lock module and set up kernel thread */
+	MOD_INC_USE_COUNT;
+	/* exit_files(current); */
+	exit_mm(current);
+	current->session = 1;
+	current->pgrp = 1;
+	sprintf(current->comm, "lockd");
+
+	/* kick rpciod */
+	rpciod_up();
+
+	dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
+
+	if (!nlm_timeout)
+		nlm_timeout = LOCKD_DFLT_TIMEO;
+
+#ifdef RPC_DEBUG
+	nlmsvc_grace_period = 10 * HZ;
+#else
+	if (nlm_grace_period) {
+		nlmsvc_grace_period += (1 + nlm_grace_period / nlm_timeout)
+						* nlm_timeout * HZ;
+	} else {
+		nlmsvc_grace_period += 5 * nlm_timeout * HZ;
+	}
+#endif
+
+	nlmsvc_grace_period += jiffies;
+	nlmsvc_timeout = nlm_timeout * HZ;
+	nlmsvc_pid = current->pid;
+
+	/*
+	 * The main request loop. We don't terminate until the last
+	 * NFS mount or NFS daemon has gone away, and we've been sent a
+	 * signal.
+	 */
+	while (nlmsvc_sema || !signalled()) {
+		if (signalled())
+			current->signal = 0;
+
+		/*
+		 * Retry any blocked locks that have been notified by
+		 * the VFS. Don't do this during grace period.
+		 * (Theoretically, there shouldn't even be blocked locks
+		 * during grace period).
+		 */
+		if (!nlmsvc_grace_period) {
+			current->timeout = nlmsvc_retry_blocked();
+		} else if (nlmsvc_grace_period < jiffies)
+			nlmsvc_grace_period = 0;
+
+		/*
+		 * Find a socket with data available and call its
+		 * recvfrom routine.
+		 */
+		if ((err = svc_recv(serv, rqstp)) == -EAGAIN)
+			continue;
+		if (err < 0) {
+			if (err != -EINTR)
+				printk(KERN_WARNING
+					"lockd: terminating on error %d\n",
+					-err);
+			break;
+		}
+
+		dprintk("lockd: request from %08lx\n",
+				ntohl(rqstp->rq_addr.sin_addr.s_addr));
+
+		/*
+		 * Look up the NFS client handle. The handle is needed for
+		 * all but the GRANTED callback RPCs.
+		 */
+		if (nlmsvc_ops) {
+			nlmsvc_ops->exp_readlock();
+			rqstp->rq_client =
+				nlmsvc_ops->exp_getclient(&rqstp->rq_addr);
+		} else {
+			rqstp->rq_client = NULL;
+		}
+
+		/* Process request with all signals blocked.  */
+		oldsigmask = current->blocked;
+		current->blocked = BLOCKABLE_SIGS;
+		svc_process(serv, rqstp);
+		current->blocked = oldsigmask;
+
+		/* Unlock export hash tables */
+		if (nlmsvc_ops)
+			nlmsvc_ops->exp_unlock();
+	}
+
+	nlm_shutdown_hosts();
+
+	/* Exit the RPC thread */
+	svc_exit_thread(rqstp);
+
+	/* release rpciod */
+	rpciod_down();
+
+	/* Release module */
+	MOD_DEC_USE_COUNT;
+	nlmsvc_pid = 0;
+}
+
+/*
+ * Make a socket for lockd
+ * FIXME: Move this to net/sunrpc/svc.c so that we can share this with nfsd.
+ */
+static int
+lockd_makesock(struct svc_serv *serv, int protocol, unsigned short port)
+{
+	struct sockaddr_in	sin;
+
+	dprintk("lockd: creating socket proto = %d\n", protocol);
+	sin.sin_family      = AF_INET;
+	sin.sin_addr.s_addr = INADDR_ANY;
+	sin.sin_port        = htons(port);
+	return svc_create_socket(serv, protocol, &sin);
+}
+
+int
+lockd_up(void)
+{
+	struct svc_serv *	serv;
+	int			error;
+
+	if (nlmsvc_pid || nlmsvc_sema++)
+		return 0;
+
+	dprintk("lockd: creating service\n");
+	if ((serv = svc_create(&nlmsvc_program, 0, NLMSVC_XDRSIZE)) == NULL)
+		return -ENOMEM;
+
+	if ((error = lockd_makesock(serv, IPPROTO_UDP, 0)) < 0
+	 || (error = lockd_makesock(serv, IPPROTO_TCP, 0)) < 0) {
+		svc_destroy(serv);
+		return error;
+	}
+
+	if ((error = svc_create_thread(lockd, serv)) < 0)
+		nlmsvc_sema--;
+
+	/* Release server */
+	svc_destroy(serv);
+	return 0;
+}
+
+void
+lockd_down(void)
+{
+	if (!nlmsvc_pid || --nlmsvc_sema > 0)
+		return;
+
+	kill_proc(nlmsvc_pid, SIGKILL, 1);
+	nlmsvc_sema = 0;
+	nlmsvc_pid = 0;
+}
+
+#ifdef MODULE
+/* New module support in 2.1.18 */
+#if LINUX_VERSION_CODE >= 0x020112
+  EXPORT_NO_SYMBOLS;
+  MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
+  MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
+  MODULE_PARM(nlm_grace_period, "10-240l");
+  MODULE_PARM(nlm_timeout, "3-20l");
+#endif
+int
+init_module(void)
+{
+	nlmxdr_init();
+	return 0;
+}
+
+void
+cleanup_module(void)
+{
+	/* FIXME: delete all NLM clients */
+	nlm_shutdown_hosts();
+}
+#endif
+
+/*
+ * Define NLM program and procedures
+ */
+static struct svc_version	nlmsvc_version1 = {
+	1, 16, nlmsvc_procedures, NULL
+};
+static struct svc_version	nlmsvc_version3 = {
+	3, 24, nlmsvc_procedures, NULL
+};
+#ifdef CONFIG_NFSD_NFS3
+static struct svc_version	nlmsvc_version4 = {
+	4, 24, nlmsvc_procedures4, NULL
+};
+#endif
+static struct svc_version *	nlmsvc_version[] = {
+	NULL,
+	&nlmsvc_version1,
+	NULL,
+	&nlmsvc_version3,
+#ifdef CONFIG_NFSD_NFS3
+	&nlmsvc_version4,
+#endif
+};
+
+static struct svc_stat		nlmsvc_stats;
+
+#define NLM_NRVERS	(sizeof(nlmsvc_version)/sizeof(nlmsvc_version[0]))
+struct svc_program		nlmsvc_program = {
+	NLM_PROGRAM,		/* program number */
+	1, NLM_NRVERS-1,	/* version range */
+	NLM_NRVERS,		/* number of entries in nlmsvc_version */
+	nlmsvc_version,		/* version table */
+	"lockd",		/* service name */
+	&nlmsvc_stats,		/* stats table */
+};