Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 519 insertions, 0 deletions

diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
new file mode 100644
index 0000000..b82e470
--- /dev/null
+++ b/fs/lockd/svc.c
@@ -0,0 +1,519 @@
+/*
+ * 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>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/moduleparam.h>
+
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/in.h>
+#include <linux/uio.h>
+#include <linux/slab.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>
+#include <linux/nfs.h>
+
+#define NLMDBG_FACILITY		NLMDBG_SVC
+#define LOCKD_BUFSIZE		(1024 + NLMSVC_XDRSIZE)
+#define ALLOWED_SIGS		(sigmask(SIGKILL))
+
+static struct svc_program	nlmsvc_program;
+
+struct nlmsvc_binding *		nlmsvc_ops;
+EXPORT_SYMBOL(nlmsvc_ops);
+
+static DECLARE_MUTEX(nlmsvc_sema);
+static unsigned int		nlmsvc_users;
+static pid_t			nlmsvc_pid;
+int				nlmsvc_grace_period;
+unsigned long			nlmsvc_timeout;
+
+static DECLARE_MUTEX_LOCKED(lockd_start);
+static DECLARE_WAIT_QUEUE_HEAD(lockd_exit);
+
+/*
+ * These can be set at insmod time (useful for NFS as root filesystem),
+ * and also changed through the sysctl interface.  -- Jamie Lokier, Aug 2003
+ */
+static unsigned long		nlm_grace_period;
+static unsigned long		nlm_timeout = LOCKD_DFLT_TIMEO;
+static int			nlm_udpport, nlm_tcpport;
+
+/*
+ * Constants needed for the sysctl interface.
+ */
+static const unsigned long	nlm_grace_period_min = 0;
+static const unsigned long	nlm_grace_period_max = 240;
+static const unsigned long	nlm_timeout_min = 3;
+static const unsigned long	nlm_timeout_max = 20;
+static const int		nlm_port_min = 0, nlm_port_max = 65535;
+
+static struct ctl_table_header * nlm_sysctl_table;
+
+static unsigned long set_grace_period(void)
+{
+	unsigned long grace_period;
+
+	/* Note: nlm_timeout should always be nonzero */
+	if (nlm_grace_period)
+		grace_period = ((nlm_grace_period + nlm_timeout - 1)
+				/ nlm_timeout) * nlm_timeout * HZ;
+	else
+		grace_period = nlm_timeout * 5 * HZ;
+	nlmsvc_grace_period = 1;
+	return grace_period + jiffies;
+}
+
+static inline void clear_grace_period(void)
+{
+	nlmsvc_grace_period = 0;
+}
+
+/*
+ * This is the lockd kernel thread
+ */
+static void
+lockd(struct svc_rqst *rqstp)
+{
+	struct svc_serv	*serv = rqstp->rq_server;
+	int		err = 0;
+	unsigned long grace_period_expire;
+
+	/* Lock module and set up kernel thread */
+	/* lockd_up is waiting for us to startup, so will
+	 * be holding a reference to this module, so it
+	 * is safe to just claim another reference
+	 */
+	__module_get(THIS_MODULE);
+	lock_kernel();
+
+	/*
+	 * Let our maker know we're running.
+	 */
+	nlmsvc_pid = current->pid;
+	up(&lockd_start);
+
+	daemonize("lockd");
+
+	/* Process request with signals blocked, but allow SIGKILL.  */
+	allow_signal(SIGKILL);
+
+	/* kick rpciod */
+	rpciod_up();
+
+	dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
+
+	if (!nlm_timeout)
+		nlm_timeout = LOCKD_DFLT_TIMEO;
+	nlmsvc_timeout = nlm_timeout * HZ;
+
+	grace_period_expire = set_grace_period();
+
+	/*
+	 * 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, or else another process has taken over our job.
+	 */
+	while ((nlmsvc_users || !signalled()) && nlmsvc_pid == current->pid) {
+		long timeout = MAX_SCHEDULE_TIMEOUT;
+
+		if (signalled()) {
+			flush_signals(current);
+			if (nlmsvc_ops) {
+				nlmsvc_invalidate_all();
+				grace_period_expire = set_grace_period();
+			}
+		}
+
+		/*
+		 * 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) {
+			timeout = nlmsvc_retry_blocked();
+		} else if (time_before(grace_period_expire, jiffies))
+			clear_grace_period();
+
+		/*
+		 * Find a socket with data available and call its
+		 * recvfrom routine.
+		 */
+		err = svc_recv(serv, rqstp, timeout);
+		if (err == -EAGAIN || err == -EINTR)
+			continue;
+		if (err < 0) {
+			printk(KERN_WARNING
+			       "lockd: terminating on error %d\n",
+			       -err);
+			break;
+		}
+
+		dprintk("lockd: request from %08x\n",
+			(unsigned)ntohl(rqstp->rq_addr.sin_addr.s_addr));
+
+		svc_process(serv, rqstp);
+
+	}
+
+	/*
+	 * Check whether there's a new lockd process before
+	 * shutting down the hosts and clearing the slot.
+	 */
+	if (!nlmsvc_pid || current->pid == nlmsvc_pid) {
+		if (nlmsvc_ops)
+			nlmsvc_invalidate_all();
+		nlm_shutdown_hosts();
+		nlmsvc_pid = 0;
+	} else
+		printk(KERN_DEBUG
+			"lockd: new process, skipping host shutdown\n");
+	wake_up(&lockd_exit);
+		
+	/* Exit the RPC thread */
+	svc_exit_thread(rqstp);
+
+	/* release rpciod */
+	rpciod_down();
+
+	/* Release module */
+	unlock_kernel();
+	module_put_and_exit(0);
+}
+
+/*
+ * Bring up the lockd process if it's not already up.
+ */
+int
+lockd_up(void)
+{
+	static int		warned;
+	struct svc_serv *	serv;
+	int			error = 0;
+
+	down(&nlmsvc_sema);
+	/*
+	 * Unconditionally increment the user count ... this is
+	 * the number of clients who _want_ a lockd process.
+	 */
+	nlmsvc_users++; 
+	/*
+	 * Check whether we're already up and running.
+	 */
+	if (nlmsvc_pid)
+		goto out;
+
+	/*
+	 * Sanity check: if there's no pid,
+	 * we should be the first user ...
+	 */
+	if (nlmsvc_users > 1)
+		printk(KERN_WARNING
+			"lockd_up: no pid, %d users??\n", nlmsvc_users);
+
+	error = -ENOMEM;
+	serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE);
+	if (!serv) {
+		printk(KERN_WARNING "lockd_up: create service failed\n");
+		goto out;
+	}
+
+	if ((error = svc_makesock(serv, IPPROTO_UDP, nlm_udpport)) < 0 
+#ifdef CONFIG_NFSD_TCP
+	 || (error = svc_makesock(serv, IPPROTO_TCP, nlm_tcpport)) < 0
+#endif
+		) {
+		if (warned++ == 0) 
+			printk(KERN_WARNING
+				"lockd_up: makesock failed, error=%d\n", error);
+		goto destroy_and_out;
+	} 
+	warned = 0;
+
+	/*
+	 * Create the kernel thread and wait for it to start.
+	 */
+	error = svc_create_thread(lockd, serv);
+	if (error) {
+		printk(KERN_WARNING
+			"lockd_up: create thread failed, error=%d\n", error);
+		goto destroy_and_out;
+	}
+	down(&lockd_start);
+
+	/*
+	 * Note: svc_serv structures have an initial use count of 1,
+	 * so we exit through here on both success and failure.
+	 */
+destroy_and_out:
+	svc_destroy(serv);
+out:
+	up(&nlmsvc_sema);
+	return error;
+}
+EXPORT_SYMBOL(lockd_up);
+
+/*
+ * Decrement the user count and bring down lockd if we're the last.
+ */
+void
+lockd_down(void)
+{
+	static int warned;
+
+	down(&nlmsvc_sema);
+	if (nlmsvc_users) {
+		if (--nlmsvc_users)
+			goto out;
+	} else
+		printk(KERN_WARNING "lockd_down: no users! pid=%d\n", nlmsvc_pid);
+
+	if (!nlmsvc_pid) {
+		if (warned++ == 0)
+			printk(KERN_WARNING "lockd_down: no lockd running.\n"); 
+		goto out;
+	}
+	warned = 0;
+
+	kill_proc(nlmsvc_pid, SIGKILL, 1);
+	/*
+	 * Wait for the lockd process to exit, but since we're holding
+	 * the lockd semaphore, we can't wait around forever ...
+	 */
+	clear_thread_flag(TIF_SIGPENDING);
+	interruptible_sleep_on_timeout(&lockd_exit, HZ);
+	if (nlmsvc_pid) {
+		printk(KERN_WARNING 
+			"lockd_down: lockd failed to exit, clearing pid\n");
+		nlmsvc_pid = 0;
+	}
+	spin_lock_irq(&current->sighand->siglock);
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+out:
+	up(&nlmsvc_sema);
+}
+EXPORT_SYMBOL(lockd_down);
+
+/*
+ * Sysctl parameters (same as module parameters, different interface).
+ */
+
+/* Something that isn't CTL_ANY, CTL_NONE or a value that may clash. */
+#define CTL_UNNUMBERED		-2
+
+static ctl_table nlm_sysctls[] = {
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "nlm_grace_period",
+		.data		= &nlm_grace_period,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_doulongvec_minmax,
+		.extra1		= (unsigned long *) &nlm_grace_period_min,
+		.extra2		= (unsigned long *) &nlm_grace_period_max,
+	},
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "nlm_timeout",
+		.data		= &nlm_timeout,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_doulongvec_minmax,
+		.extra1		= (unsigned long *) &nlm_timeout_min,
+		.extra2		= (unsigned long *) &nlm_timeout_max,
+	},
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "nlm_udpport",
+		.data		= &nlm_udpport,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.extra1		= (int *) &nlm_port_min,
+		.extra2		= (int *) &nlm_port_max,
+	},
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "nlm_tcpport",
+		.data		= &nlm_tcpport,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.extra1		= (int *) &nlm_port_min,
+		.extra2		= (int *) &nlm_port_max,
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table nlm_sysctl_dir[] = {
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "nfs",
+		.mode		= 0555,
+		.child		= nlm_sysctls,
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table nlm_sysctl_root[] = {
+	{
+		.ctl_name	= CTL_FS,
+		.procname	= "fs",
+		.mode		= 0555,
+		.child		= nlm_sysctl_dir,
+	},
+	{ .ctl_name = 0 }
+};
+
+/*
+ * Module (and driverfs) parameters.
+ */
+
+#define param_set_min_max(name, type, which_strtol, min, max)		\
+static int param_set_##name(const char *val, struct kernel_param *kp)	\
+{									\
+	char *endp;							\
+	__typeof__(type) num = which_strtol(val, &endp, 0);		\
+	if (endp == val || *endp || num < (min) || num > (max))		\
+		return -EINVAL;						\
+	*((int *) kp->arg) = num;					\
+	return 0;							\
+}
+
+static inline int is_callback(u32 proc)
+{
+	return proc == NLMPROC_GRANTED
+		|| proc == NLMPROC_GRANTED_MSG
+		|| proc == NLMPROC_TEST_RES
+		|| proc == NLMPROC_LOCK_RES
+		|| proc == NLMPROC_CANCEL_RES
+		|| proc == NLMPROC_UNLOCK_RES
+		|| proc == NLMPROC_NSM_NOTIFY;
+}
+
+
+static int lockd_authenticate(struct svc_rqst *rqstp)
+{
+	rqstp->rq_client = NULL;
+	switch (rqstp->rq_authop->flavour) {
+		case RPC_AUTH_NULL:
+		case RPC_AUTH_UNIX:
+			if (rqstp->rq_proc == 0)
+				return SVC_OK;
+			if (is_callback(rqstp->rq_proc)) {
+				/* Leave it to individual procedures to
+				 * call nlmsvc_lookup_host(rqstp)
+				 */
+				return SVC_OK;
+			}
+			return svc_set_client(rqstp);
+	}
+	return SVC_DENIED;
+}
+
+
+param_set_min_max(port, int, simple_strtol, 0, 65535)
+param_set_min_max(grace_period, unsigned long, simple_strtoul,
+		  nlm_grace_period_min, nlm_grace_period_max)
+param_set_min_max(timeout, unsigned long, simple_strtoul,
+		  nlm_timeout_min, nlm_timeout_max)
+
+MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
+MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
+MODULE_LICENSE("GPL");
+
+module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
+		  &nlm_grace_period, 0644);
+module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
+		  &nlm_timeout, 0644);
+module_param_call(nlm_udpport, param_set_port, param_get_int,
+		  &nlm_udpport, 0644);
+module_param_call(nlm_tcpport, param_set_port, param_get_int,
+		  &nlm_tcpport, 0644);
+
+/*
+ * Initialising and terminating the module.
+ */
+
+static int __init init_nlm(void)
+{
+	nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root, 0);
+	return nlm_sysctl_table ? 0 : -ENOMEM;
+}
+
+static void __exit exit_nlm(void)
+{
+	/* FIXME: delete all NLM clients */
+	nlm_shutdown_hosts();
+	unregister_sysctl_table(nlm_sysctl_table);
+}
+
+module_init(init_nlm);
+module_exit(exit_nlm);
+
+/*
+ * Define NLM program and procedures
+ */
+static struct svc_version	nlmsvc_version1 = {
+		.vs_vers	= 1,
+		.vs_nproc	= 17,
+		.vs_proc	= nlmsvc_procedures,
+		.vs_xdrsize	= NLMSVC_XDRSIZE,
+};
+static struct svc_version	nlmsvc_version3 = {
+		.vs_vers	= 3,
+		.vs_nproc	= 24,
+		.vs_proc	= nlmsvc_procedures,
+		.vs_xdrsize	= NLMSVC_XDRSIZE,
+};
+#ifdef CONFIG_LOCKD_V4
+static struct svc_version	nlmsvc_version4 = {
+		.vs_vers	= 4,
+		.vs_nproc	= 24,
+		.vs_proc	= nlmsvc_procedures4,
+		.vs_xdrsize	= NLMSVC_XDRSIZE,
+};
+#endif
+static struct svc_version *	nlmsvc_version[] = {
+	[1] = &nlmsvc_version1,
+	[3] = &nlmsvc_version3,
+#ifdef CONFIG_LOCKD_V4
+	[4] = &nlmsvc_version4,
+#endif
+};
+
+static struct svc_stat		nlmsvc_stats;
+
+#define NLM_NRVERS	(sizeof(nlmsvc_version)/sizeof(nlmsvc_version[0]))
+static struct svc_program	nlmsvc_program = {
+	.pg_prog		= NLM_PROGRAM,		/* program number */
+	.pg_nvers		= NLM_NRVERS,		/* number of entries in nlmsvc_version */
+	.pg_vers		= nlmsvc_version,	/* version table */
+	.pg_name		= "lockd",		/* service name */
+	.pg_class		= "nfsd",		/* share authentication with nfsd */
+	.pg_stats		= &nlmsvc_stats,	/* stats table */
+	.pg_authenticate = &lockd_authenticate	/* export authentication */
+};