[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / lockd / svc.c

/*
 * 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/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/smp.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
#include <linux/kthread.h>
#include <linux/freezer.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 <net/ip.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_GPL(nlmsvc_ops);

static DEFINE_MUTEX(nlmsvc_mutex);
static unsigned int		nlmsvc_users;
static struct task_struct	*nlmsvc_task;
static struct svc_rqst		*nlmsvc_rqst;
unsigned long			nlmsvc_timeout;

/*
 * 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;

/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
static unsigned int		nlm_max_connections = 1024;

/*
 * 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;

#ifdef CONFIG_SYSCTL
static struct ctl_table_header * nlm_sysctl_table;
#endif

static unsigned long get_lockd_grace_period(void)
{
	/* Note: nlm_timeout should always be nonzero */
	if (nlm_grace_period)
		return roundup(nlm_grace_period, nlm_timeout) * HZ;
	else
		return nlm_timeout * 5 * HZ;
}

static struct lock_manager lockd_manager = {
};

static void grace_ender(struct work_struct *not_used)
{
	locks_end_grace(&lockd_manager);
}

static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);

static void set_grace_period(void)
{
	unsigned long grace_period = get_lockd_grace_period();

	locks_start_grace(&lockd_manager);
	cancel_delayed_work_sync(&grace_period_end);
	schedule_delayed_work(&grace_period_end, grace_period);
}

static void restart_grace(void)
{
	if (nlmsvc_ops) {
		cancel_delayed_work_sync(&grace_period_end);
		locks_end_grace(&lockd_manager);
		nlmsvc_invalidate_all();
		set_grace_period();
	}
}

/*
 * This is the lockd kernel thread
 */
static int
lockd(void *vrqstp)
{
	int		err = 0, preverr = 0;
	struct svc_rqst *rqstp = vrqstp;

	/* try_to_freeze() is called from svc_recv() */
	set_freezable();

	/* Allow SIGKILL to tell lockd to drop all of its locks */
	allow_signal(SIGKILL);

	dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");

	/*
	 * FIXME: it would be nice if lockd didn't spend its entire life
	 * running under the BKL. At the very least, it would be good to
	 * have someone clarify what it's intended to protect here. I've
	 * seen some handwavy posts about posix locking needing to be
	 * done under the BKL, but it's far from clear.
	 */
	lock_kernel();

	if (!nlm_timeout)
		nlm_timeout = LOCKD_DFLT_TIMEO;
	nlmsvc_timeout = nlm_timeout * HZ;

	set_grace_period();

	/*
	 * The main request loop. We don't terminate until the last
	 * NFS mount or NFS daemon has gone away.
	 */
	while (!kthread_should_stop()) {
		long timeout = MAX_SCHEDULE_TIMEOUT;
		RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);

		/* update sv_maxconn if it has changed */
		rqstp->rq_server->sv_maxconn = nlm_max_connections;

		if (signalled()) {
			flush_signals(current);
			restart_grace();
			continue;
		}

		timeout = nlmsvc_retry_blocked();

		/*
		 * Find a socket with data available and call its
		 * recvfrom routine.
		 */
		err = svc_recv(rqstp, timeout);
		if (err == -EAGAIN || err == -EINTR) {
			preverr = err;
			continue;
		}
		if (err < 0) {
			if (err != preverr) {
				printk(KERN_WARNING "%s: unexpected error "
					"from svc_recv (%d)\n", __func__, err);
				preverr = err;
			}
			schedule_timeout_interruptible(HZ);
			continue;
		}
		preverr = err;

		dprintk("lockd: request from %s\n",
				svc_print_addr(rqstp, buf, sizeof(buf)));

		svc_process(rqstp);
	}
	flush_signals(current);
	cancel_delayed_work_sync(&grace_period_end);
	locks_end_grace(&lockd_manager);
	if (nlmsvc_ops)
		nlmsvc_invalidate_all();
	nlm_shutdown_hosts();
	unlock_kernel();
	return 0;
}

static int create_lockd_listener(struct svc_serv *serv, const char *name,
				 const int family, const unsigned short port)
{
	struct svc_xprt *xprt;

	xprt = svc_find_xprt(serv, name, family, 0);
	if (xprt == NULL)
		return svc_create_xprt(serv, name, family, port,
						SVC_SOCK_DEFAULTS);
	svc_xprt_put(xprt);
	return 0;
}

static int create_lockd_family(struct svc_serv *serv, const int family)
{
	int err;

	err = create_lockd_listener(serv, "udp", family, nlm_udpport);
	if (err < 0)
		return err;

	return create_lockd_listener(serv, "tcp", family, nlm_tcpport);
}

/*
 * Ensure there are active UDP and TCP listeners for lockd.
 *
 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
 * local services (such as rpc.statd) still require UDP, and
 * some NFS servers do not yet support NLM over TCP.
 *
 * Returns zero if all listeners are available; otherwise a
 * negative errno value is returned.
 */
static int make_socks(struct svc_serv *serv)
{
	static int warned;
	int err;

	err = create_lockd_family(serv, PF_INET);
	if (err < 0)
		goto out_err;

	err = create_lockd_family(serv, PF_INET6);
	if (err < 0 && err != -EAFNOSUPPORT)
		goto out_err;

	warned = 0;
	return 0;

out_err:
	if (warned++ == 0)
		printk(KERN_WARNING
			"lockd_up: makesock failed, error=%d\n", err);
	return err;
}

/*
 * Bring up the lockd process if it's not already up.
 */
int lockd_up(void)
{
	struct svc_serv *serv;
	int		error = 0;

	mutex_lock(&nlmsvc_mutex);
	/*
	 * Check whether we're already up and running.
	 */
	if (nlmsvc_rqst)
		goto out;

	/*
	 * Sanity check: if there's no pid,
	 * we should be the first user ...
	 */
	if (nlmsvc_users)
		printk(KERN_WARNING
			"lockd_up: no pid, %d users??\n", nlmsvc_users);

	error = -ENOMEM;
	serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
	if (!serv) {
		printk(KERN_WARNING "lockd_up: create service failed\n");
		goto out;
	}

	error = make_socks(serv);
	if (error < 0)
		goto destroy_and_out;

	/*
	 * Create the kernel thread and wait for it to start.
	 */
	nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
	if (IS_ERR(nlmsvc_rqst)) {
		error = PTR_ERR(nlmsvc_rqst);
		nlmsvc_rqst = NULL;
		printk(KERN_WARNING
			"lockd_up: svc_rqst allocation failed, error=%d\n",
			error);
		goto destroy_and_out;
	}

	svc_sock_update_bufs(serv);
	serv->sv_maxconn = nlm_max_connections;

	nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
	if (IS_ERR(nlmsvc_task)) {
		error = PTR_ERR(nlmsvc_task);
		svc_exit_thread(nlmsvc_rqst);
		nlmsvc_task = NULL;
		nlmsvc_rqst = NULL;
		printk(KERN_WARNING
			"lockd_up: kthread_run failed, error=%d\n", error);
		goto destroy_and_out;
	}

	/*
	 * 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:
	if (!error)
		nlmsvc_users++;
	mutex_unlock(&nlmsvc_mutex);
	return error;
}
EXPORT_SYMBOL_GPL(lockd_up);

/*
 * Decrement the user count and bring down lockd if we're the last.
 */
void
lockd_down(void)
{
	mutex_lock(&nlmsvc_mutex);
	if (nlmsvc_users) {
		if (--nlmsvc_users)
			goto out;
	} else {
		printk(KERN_ERR "lockd_down: no users! task=%p\n",
			nlmsvc_task);
		BUG();
	}

	if (!nlmsvc_task) {
		printk(KERN_ERR "lockd_down: no lockd running.\n");
		BUG();
	}
	kthread_stop(nlmsvc_task);
	svc_exit_thread(nlmsvc_rqst);
	nlmsvc_task = NULL;
	nlmsvc_rqst = NULL;
out:
	mutex_unlock(&nlmsvc_mutex);
}
EXPORT_SYMBOL_GPL(lockd_down);

#ifdef CONFIG_SYSCTL

/*
 * Sysctl parameters (same as module parameters, different interface).
 */

static ctl_table nlm_sysctls[] = {
	{
		.procname	= "nlm_grace_period",
		.data		= &nlm_grace_period,
		.maxlen		= sizeof(unsigned long),
		.mode		= 0644,
		.proc_handler	= proc_doulongvec_minmax,
		.extra1		= (unsigned long *) &nlm_grace_period_min,
		.extra2		= (unsigned long *) &nlm_grace_period_max,
	},
	{
		.procname	= "nlm_timeout",
		.data		= &nlm_timeout,
		.maxlen		= sizeof(unsigned long),
		.mode		= 0644,
		.proc_handler	= proc_doulongvec_minmax,
		.extra1		= (unsigned long *) &nlm_timeout_min,
		.extra2		= (unsigned long *) &nlm_timeout_max,
	},
	{
		.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,
	},
	{
		.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,
	},
	{
		.procname	= "nsm_use_hostnames",
		.data		= &nsm_use_hostnames,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "nsm_local_state",
		.data		= &nsm_local_state,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{ }
};

static ctl_table nlm_sysctl_dir[] = {
	{
		.procname	= "nfs",
		.mode		= 0555,
		.child		= nlm_sysctls,
	},
	{ }
};

static ctl_table nlm_sysctl_root[] = {
	{
		.procname	= "fs",
		.mode		= 0555,
		.child		= nlm_sysctl_dir,
	},
	{ }
};

#endif	/* CONFIG_SYSCTL */

/*
 * Module (and sysfs) 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);
module_param(nsm_use_hostnames, bool, 0644);
module_param(nlm_max_connections, uint, 0644);

/*
 * Initialising and terminating the module.
 */

static int __init init_nlm(void)
{
#ifdef CONFIG_SYSCTL
	nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
	return nlm_sysctl_table ? 0 : -ENOMEM;
#else
	return 0;
#endif
}

static void __exit exit_nlm(void)
{
	/* FIXME: delete all NLM clients */
	nlm_shutdown_hosts();
#ifdef CONFIG_SYSCTL
	unregister_sysctl_table(nlm_sysctl_table);
#endif
}

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	ARRAY_SIZE(nlmsvc_version)
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 */
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svc.c
	3	*
	4	* This is the central lockd service.
	5	*
	6	* FIXME: Separate the lockd NFS server functionality from the lockd NFS
	7	* client functionality. Oh why didn't Sun create two separate
	8	* services in the first place?
	9	*
	10	* Authors: Olaf Kirch (okir@monad.swb.de)
	11	*
	12	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	13	*/
	14
1da177e4 LT	15	#include <linux/module.h>
	16	#include <linux/init.h>
	17	#include <linux/sysctl.h>
	18	#include <linux/moduleparam.h>
	19
	20	#include <linux/sched.h>
	21	#include <linux/errno.h>
	22	#include <linux/in.h>
	23	#include <linux/uio.h>
1da177e4 LT	24	#include <linux/smp.h>
1da177e4 LT	25	#include <linux/smp_lock.h>
353ab6e9	26	#include <linux/mutex.h>
d751a7cd	27	#include <linux/kthread.h>
83144186	28	#include <linux/freezer.h>
1da177e4 LT	29
	30	#include <linux/sunrpc/types.h>
	31	#include <linux/sunrpc/stats.h>
	32	#include <linux/sunrpc/clnt.h>
	33	#include <linux/sunrpc/svc.h>
	34	#include <linux/sunrpc/svcsock.h>
24e36663	35	#include <net/ip.h>
1da177e4 LT	36	#include <linux/lockd/lockd.h>
	37	#include <linux/nfs.h>
	38
	39	#define NLMDBG_FACILITY NLMDBG_SVC
	40	#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
	41	#define ALLOWED_SIGS (sigmask(SIGKILL))
	42
	43	static struct svc_program nlmsvc_program;
	44
	45	struct nlmsvc_binding * nlmsvc_ops;
2de59872	46	EXPORT_SYMBOL_GPL(nlmsvc_ops);
1da177e4	47
353ab6e9	48	static DEFINE_MUTEX(nlmsvc_mutex);
1da177e4	49	static unsigned int nlmsvc_users;
d751a7cd	50	static struct task_struct *nlmsvc_task;
abd1ec4e	51	static struct svc_rqst *nlmsvc_rqst;
1da177e4 LT	52	unsigned long nlmsvc_timeout;
1da177e4 LT	53
1da177e4 LT	54	/*
	55	* These can be set at insmod time (useful for NFS as root filesystem),
	56	* and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
	57	*/
	58	static unsigned long nlm_grace_period;
	59	static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
	60	static int nlm_udpport, nlm_tcpport;
	61
c72a476b JL	62	/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
	63	static unsigned int nlm_max_connections = 1024;
	64
1da177e4 LT	65	/*
	66	* Constants needed for the sysctl interface.
	67	*/
	68	static const unsigned long nlm_grace_period_min = 0;
	69	static const unsigned long nlm_grace_period_max = 240;
	70	static const unsigned long nlm_timeout_min = 3;
	71	static const unsigned long nlm_timeout_max = 20;
	72	static const int nlm_port_min = 0, nlm_port_max = 65535;
	73
90d5b180	74	#ifdef CONFIG_SYSCTL
1da177e4	75	static struct ctl_table_header * nlm_sysctl_table;
90d5b180	76	#endif
1da177e4	77
9a8db97e	78	static unsigned long get_lockd_grace_period(void)
1da177e4	79	{
1da177e4 LT	80	/* Note: nlm_timeout should always be nonzero */
1da177e4 LT	81	if (nlm_grace_period)
9a8db97e	82	return roundup(nlm_grace_period, nlm_timeout) * HZ;
1da177e4	83	else
9a8db97e ME	84	return nlm_timeout * 5 * HZ;
	85	}
	86
af558e33 BF	87	static struct lock_manager lockd_manager = {
af558e33 BF	88	};
9a8db97e	89
c8ab5f2a	90	static void grace_ender(struct work_struct *not_used)
9a8db97e	91	{
af558e33	92	locks_end_grace(&lockd_manager);
1da177e4 LT	93	}
1da177e4 LT	94
c8ab5f2a BF	95	static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
	96
	97	static void set_grace_period(void)
1da177e4	98	{
af558e33	99	unsigned long grace_period = get_lockd_grace_period();
c8ab5f2a	100
af558e33	101	locks_start_grace(&lockd_manager);
c8ab5f2a BF	102	cancel_delayed_work_sync(&grace_period_end);
c8ab5f2a BF	103	schedule_delayed_work(&grace_period_end, grace_period);
1da177e4 LT	104	}
1da177e4 LT	105
89996df4 BF	106	static void restart_grace(void)
	107	{
	108	if (nlmsvc_ops) {
	109	cancel_delayed_work_sync(&grace_period_end);
	110	locks_end_grace(&lockd_manager);
	111	nlmsvc_invalidate_all();
	112	set_grace_period();
	113	}
	114	}
	115
1da177e4 LT	116	/*
	117	* This is the lockd kernel thread
	118	*/
d751a7cd JL	119	static int
d751a7cd JL	120	lockd(void *vrqstp)
1da177e4	121	{
f97c650d	122	int err = 0, preverr = 0;
d751a7cd	123	struct svc_rqst *rqstp = vrqstp;
1da177e4	124
d751a7cd	125	/* try_to_freeze() is called from svc_recv() */
83144186	126	set_freezable();
1da177e4	127
d751a7cd	128	/* Allow SIGKILL to tell lockd to drop all of its locks */
1da177e4 LT	129	allow_signal(SIGKILL);
1da177e4 LT	130
1da177e4 LT	131	dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
1da177e4 LT	132
d751a7cd JL	133	/*
	134	* FIXME: it would be nice if lockd didn't spend its entire life
	135	* running under the BKL. At the very least, it would be good to
	136	* have someone clarify what it's intended to protect here. I've
	137	* seen some handwavy posts about posix locking needing to be
	138	* done under the BKL, but it's far from clear.
	139	*/
	140	lock_kernel();
	141
1da177e4 LT	142	if (!nlm_timeout)
	143	nlm_timeout = LOCKD_DFLT_TIMEO;
	144	nlmsvc_timeout = nlm_timeout * HZ;
	145
c8ab5f2a	146	set_grace_period();
1da177e4 LT	147
	148	/*
	149	* The main request loop. We don't terminate until the last
d751a7cd	150	* NFS mount or NFS daemon has gone away.
1da177e4	151	*/
d751a7cd	152	while (!kthread_should_stop()) {
1da177e4	153	long timeout = MAX_SCHEDULE_TIMEOUT;
5216a8e7	154	RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1da177e4	155
c72a476b JL	156	/* update sv_maxconn if it has changed */
	157	rqstp->rq_server->sv_maxconn = nlm_max_connections;
	158
1da177e4 LT	159	if (signalled()) {
1da177e4 LT	160	flush_signals(current);
89996df4	161	restart_grace();
d751a7cd	162	continue;
1da177e4 LT	163	}
1da177e4 LT	164
8fafa900 BF	165	timeout = nlmsvc_retry_blocked();
8fafa900 BF	166
1da177e4 LT	167	/*
	168	* Find a socket with data available and call its
	169	* recvfrom routine.
	170	*/
6fb2b47f	171	err = svc_recv(rqstp, timeout);
f97c650d JL	172	if (err == -EAGAIN \|\| err == -EINTR) {
f97c650d JL	173	preverr = err;
1da177e4	174	continue;
f97c650d	175	}
1da177e4	176	if (err < 0) {
f97c650d JL	177	if (err != preverr) {
	178	printk(KERN_WARNING "%s: unexpected error "
	179	"from svc_recv (%d)\n", __func__, err);
	180	preverr = err;
	181	}
	182	schedule_timeout_interruptible(HZ);
	183	continue;
1da177e4	184	}
f97c650d	185	preverr = err;
1da177e4	186
ad06e4bd CL	187	dprintk("lockd: request from %s\n",
ad06e4bd CL	188	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4	189
6fb2b47f	190	svc_process(rqstp);
1da177e4	191	}
2bd61579	192	flush_signals(current);
c8ab5f2a	193	cancel_delayed_work_sync(&grace_period_end);
2c5e7615	194	locks_end_grace(&lockd_manager);
d751a7cd JL	195	if (nlmsvc_ops)
	196	nlmsvc_invalidate_all();
	197	nlm_shutdown_hosts();
d751a7cd	198	unlock_kernel();
d751a7cd	199	return 0;
1da177e4 LT	200	}
1da177e4 LT	201
eb16e907 CL	202	static int create_lockd_listener(struct svc_serv serv, const char name,
eb16e907 CL	203	const int family, const unsigned short port)
d3fe5ea7 CL	204	{
	205	struct svc_xprt *xprt;
	206
eb16e907	207	xprt = svc_find_xprt(serv, name, family, 0);
d3fe5ea7	208	if (xprt == NULL)
eb16e907 CL	209	return svc_create_xprt(serv, name, family, port,
eb16e907 CL	210	SVC_SOCK_DEFAULTS);
d3fe5ea7 CL	211	svc_xprt_put(xprt);
	212	return 0;
	213	}
	214
eb16e907 CL	215	static int create_lockd_family(struct svc_serv *serv, const int family)
	216	{
	217	int err;
	218
	219	err = create_lockd_listener(serv, "udp", family, nlm_udpport);
	220	if (err < 0)
	221	return err;
	222
	223	return create_lockd_listener(serv, "tcp", family, nlm_tcpport);
	224	}
	225
482fb94e	226	/*
8c3916f4 CL	227	* Ensure there are active UDP and TCP listeners for lockd.
	228	*
	229	* Even if we have only TCP NFS mounts and/or TCP NFSDs, some
	230	* local services (such as rpc.statd) still require UDP, and
	231	* some NFS servers do not yet support NLM over TCP.
	232	*
	233	* Returns zero if all listeners are available; otherwise a
	234	* negative errno value is returned.
482fb94e	235	*/
8c3916f4	236	static int make_socks(struct svc_serv *serv)
24e36663	237	{
482fb94e	238	static int warned;
0dba7c2a	239	int err;
482fb94e	240
eb16e907	241	err = create_lockd_family(serv, PF_INET);
0dba7c2a CL	242	if (err < 0)
	243	goto out_err;
	244
eb16e907 CL	245	err = create_lockd_family(serv, PF_INET6);
eb16e907 CL	246	if (err < 0 && err != -EAFNOSUPPORT)
0dba7c2a CL	247	goto out_err;
	248
	249	warned = 0;
	250	return 0;
	251
	252	out_err:
	253	if (warned++ == 0)
7dcf91ec	254	printk(KERN_WARNING
0dba7c2a	255	"lockd_up: makesock failed, error=%d\n", err);
24e36663 N	256	return err;
	257	}
	258
1da177e4 LT	259	/*
	260	* Bring up the lockd process if it's not already up.
	261	*/
26a41409	262	int lockd_up(void)
1da177e4	263	{
d751a7cd	264	struct svc_serv *serv;
d751a7cd	265	int error = 0;
1da177e4	266
353ab6e9	267	mutex_lock(&nlmsvc_mutex);
1da177e4 LT	268	/*
	269	* Check whether we're already up and running.
	270	*/
8c3916f4	271	if (nlmsvc_rqst)
1da177e4 LT	272	goto out;
	273
	274	/*
	275	* Sanity check: if there's no pid,
	276	* we should be the first user ...
	277	*/
4a3ae42d	278	if (nlmsvc_users)
1da177e4 LT	279	printk(KERN_WARNING
	280	"lockd_up: no pid, %d users??\n", nlmsvc_users);
	281
	282	error = -ENOMEM;
49a9072f	283	serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
1da177e4 LT	284	if (!serv) {
	285	printk(KERN_WARNING "lockd_up: create service failed\n");
	286	goto out;
	287	}
	288
8c3916f4 CL	289	error = make_socks(serv);
8c3916f4 CL	290	if (error < 0)
1da177e4	291	goto destroy_and_out;
1da177e4 LT	292
	293	/*
	294	* Create the kernel thread and wait for it to start.
	295	*/
abd1ec4e JL	296	nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
	297	if (IS_ERR(nlmsvc_rqst)) {
	298	error = PTR_ERR(nlmsvc_rqst);
	299	nlmsvc_rqst = NULL;
d751a7cd JL	300	printk(KERN_WARNING
	301	"lockd_up: svc_rqst allocation failed, error=%d\n",
	302	error);
	303	goto destroy_and_out;
	304	}
	305
	306	svc_sock_update_bufs(serv);
c72a476b	307	serv->sv_maxconn = nlm_max_connections;
d751a7cd	308
abd1ec4e	309	nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
d751a7cd JL	310	if (IS_ERR(nlmsvc_task)) {
d751a7cd JL	311	error = PTR_ERR(nlmsvc_task);
abd1ec4e	312	svc_exit_thread(nlmsvc_rqst);
d751a7cd	313	nlmsvc_task = NULL;
abd1ec4e	314	nlmsvc_rqst = NULL;
1da177e4	315	printk(KERN_WARNING
d751a7cd	316	"lockd_up: kthread_run failed, error=%d\n", error);
1da177e4 LT	317	goto destroy_and_out;
1da177e4 LT	318	}
1da177e4 LT	319
	320	/*
	321	* Note: svc_serv structures have an initial use count of 1,
	322	* so we exit through here on both success and failure.
	323	*/
	324	destroy_and_out:
	325	svc_destroy(serv);
	326	out:
4a3ae42d N	327	if (!error)
4a3ae42d N	328	nlmsvc_users++;
353ab6e9	329	mutex_unlock(&nlmsvc_mutex);
1da177e4 LT	330	return error;
1da177e4 LT	331	}
2de59872	332	EXPORT_SYMBOL_GPL(lockd_up);
1da177e4 LT	333
	334	/*
	335	* Decrement the user count and bring down lockd if we're the last.
	336	*/
	337	void
	338	lockd_down(void)
	339	{
353ab6e9	340	mutex_lock(&nlmsvc_mutex);
1da177e4 LT	341	if (nlmsvc_users) {
	342	if (--nlmsvc_users)
	343	goto out;
d751a7cd JL	344	} else {
	345	printk(KERN_ERR "lockd_down: no users! task=%p\n",
	346	nlmsvc_task);
	347	BUG();
1da177e4	348	}
1da177e4	349
d751a7cd JL	350	if (!nlmsvc_task) {
	351	printk(KERN_ERR "lockd_down: no lockd running.\n");
	352	BUG();
1da177e4	353	}
d751a7cd	354	kthread_stop(nlmsvc_task);
abd1ec4e JL	355	svc_exit_thread(nlmsvc_rqst);
	356	nlmsvc_task = NULL;
	357	nlmsvc_rqst = NULL;
1da177e4	358	out:
353ab6e9	359	mutex_unlock(&nlmsvc_mutex);
1da177e4	360	}
2de59872	361	EXPORT_SYMBOL_GPL(lockd_down);
1da177e4	362
90d5b180 CL	363	#ifdef CONFIG_SYSCTL
90d5b180 CL	364
1da177e4 LT	365	/*
	366	* Sysctl parameters (same as module parameters, different interface).
	367	*/
	368
1da177e4 LT	369	static ctl_table nlm_sysctls[] = {
1da177e4 LT	370	{
1da177e4 LT	371	.procname = "nlm_grace_period",
1da177e4 LT	372	.data = &nlm_grace_period,
7ee91ec1	373	.maxlen = sizeof(unsigned long),
1da177e4	374	.mode = 0644,
6d456111	375	.proc_handler = proc_doulongvec_minmax,
1da177e4 LT	376	.extra1 = (unsigned long *) &nlm_grace_period_min,
	377	.extra2 = (unsigned long *) &nlm_grace_period_max,
	378	},
	379	{
1da177e4 LT	380	.procname = "nlm_timeout",
1da177e4 LT	381	.data = &nlm_timeout,
7ee91ec1	382	.maxlen = sizeof(unsigned long),
1da177e4	383	.mode = 0644,
6d456111	384	.proc_handler = proc_doulongvec_minmax,
1da177e4 LT	385	.extra1 = (unsigned long *) &nlm_timeout_min,
	386	.extra2 = (unsigned long *) &nlm_timeout_max,
	387	},
	388	{
1da177e4 LT	389	.procname = "nlm_udpport",
	390	.data = &nlm_udpport,
	391	.maxlen = sizeof(int),
	392	.mode = 0644,
6d456111	393	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	394	.extra1 = (int *) &nlm_port_min,
	395	.extra2 = (int *) &nlm_port_max,
	396	},
	397	{
1da177e4 LT	398	.procname = "nlm_tcpport",
	399	.data = &nlm_tcpport,
	400	.maxlen = sizeof(int),
	401	.mode = 0644,
6d456111	402	.proc_handler = proc_dointvec_minmax,
1da177e4 LT	403	.extra1 = (int *) &nlm_port_min,
	404	.extra2 = (int *) &nlm_port_max,
	405	},
abd1f500	406	{
abd1f500 OK	407	.procname = "nsm_use_hostnames",
	408	.data = &nsm_use_hostnames,
	409	.maxlen = sizeof(int),
	410	.mode = 0644,
6d456111	411	.proc_handler = proc_dointvec,
abd1f500	412	},
460f5cac	413	{
460f5cac OK	414	.procname = "nsm_local_state",
	415	.data = &nsm_local_state,
	416	.maxlen = sizeof(int),
	417	.mode = 0644,
6d456111	418	.proc_handler = proc_dointvec,
460f5cac	419	},
ab09203e	420	{ }
1da177e4 LT	421	};
	422
	423	static ctl_table nlm_sysctl_dir[] = {
	424	{
1da177e4 LT	425	.procname = "nfs",
	426	.mode = 0555,
	427	.child = nlm_sysctls,
	428	},
ab09203e	429	{ }
1da177e4 LT	430	};
	431
	432	static ctl_table nlm_sysctl_root[] = {
	433	{
1da177e4 LT	434	.procname = "fs",
	435	.mode = 0555,
	436	.child = nlm_sysctl_dir,
	437	},
ab09203e	438	{ }
1da177e4 LT	439	};
1da177e4 LT	440
90d5b180 CL	441	#endif /* CONFIG_SYSCTL */
90d5b180 CL	442
1da177e4	443	/*
405ae7d3	444	* Module (and sysfs) parameters.
1da177e4 LT	445	*/
	446
	447	#define param_set_min_max(name, type, which_strtol, min, max) \
	448	static int param_set_##name(const char val, struct kernel_param kp) \
	449	{ \
	450	char *endp; \
	451	__typeof__(type) num = which_strtol(val, &endp, 0); \
	452	if (endp == val \|\| *endp \|\| num < (min) \|\| num > (max)) \
	453	return -EINVAL; \
	454	((int ) kp->arg) = num; \
	455	return 0; \
	456	}
	457
	458	static inline int is_callback(u32 proc)
	459	{
	460	return proc == NLMPROC_GRANTED
	461	\|\| proc == NLMPROC_GRANTED_MSG
	462	\|\| proc == NLMPROC_TEST_RES
	463	\|\| proc == NLMPROC_LOCK_RES
	464	\|\| proc == NLMPROC_CANCEL_RES
	465	\|\| proc == NLMPROC_UNLOCK_RES
	466	\|\| proc == NLMPROC_NSM_NOTIFY;
	467	}
	468
	469
	470	static int lockd_authenticate(struct svc_rqst *rqstp)
	471	{
	472	rqstp->rq_client = NULL;
	473	switch (rqstp->rq_authop->flavour) {
	474	case RPC_AUTH_NULL:
	475	case RPC_AUTH_UNIX:
	476	if (rqstp->rq_proc == 0)
	477	return SVC_OK;
	478	if (is_callback(rqstp->rq_proc)) {
	479	/* Leave it to individual procedures to
	480	* call nlmsvc_lookup_host(rqstp)
	481	*/
	482	return SVC_OK;
	483	}
	484	return svc_set_client(rqstp);
	485	}
	486	return SVC_DENIED;
	487	}
	488
	489
	490	param_set_min_max(port, int, simple_strtol, 0, 65535)
	491	param_set_min_max(grace_period, unsigned long, simple_strtoul,
	492	nlm_grace_period_min, nlm_grace_period_max)
	493	param_set_min_max(timeout, unsigned long, simple_strtoul,
	494	nlm_timeout_min, nlm_timeout_max)
	495
	496	MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
	497	MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
	498	MODULE_LICENSE("GPL");
	499
	500	module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
	501	&nlm_grace_period, 0644);
	502	module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
	503	&nlm_timeout, 0644);
	504	module_param_call(nlm_udpport, param_set_port, param_get_int,
	505	&nlm_udpport, 0644);
	506	module_param_call(nlm_tcpport, param_set_port, param_get_int,
	507	&nlm_tcpport, 0644);
abd1f500	508	module_param(nsm_use_hostnames, bool, 0644);
c72a476b	509	module_param(nlm_max_connections, uint, 0644);
1da177e4 LT	510
	511	/*
	512	* Initialising and terminating the module.
	513	*/
	514
	515	static int __init init_nlm(void)
	516	{
90d5b180	517	#ifdef CONFIG_SYSCTL
0b4d4147	518	nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
1da177e4	519	return nlm_sysctl_table ? 0 : -ENOMEM;
90d5b180 CL	520	#else
	521	return 0;
	522	#endif
1da177e4 LT	523	}
	524
	525	static void __exit exit_nlm(void)
	526	{
	527	/* FIXME: delete all NLM clients */
	528	nlm_shutdown_hosts();
90d5b180	529	#ifdef CONFIG_SYSCTL
1da177e4	530	unregister_sysctl_table(nlm_sysctl_table);
90d5b180	531	#endif
1da177e4 LT	532	}
	533
	534	module_init(init_nlm);
	535	module_exit(exit_nlm);
	536
	537	/*
	538	* Define NLM program and procedures
	539	*/
	540	static struct svc_version nlmsvc_version1 = {
	541	.vs_vers = 1,
	542	.vs_nproc = 17,
	543	.vs_proc = nlmsvc_procedures,
	544	.vs_xdrsize = NLMSVC_XDRSIZE,
	545	};
	546	static struct svc_version nlmsvc_version3 = {
	547	.vs_vers = 3,
	548	.vs_nproc = 24,
	549	.vs_proc = nlmsvc_procedures,
	550	.vs_xdrsize = NLMSVC_XDRSIZE,
	551	};
	552	#ifdef CONFIG_LOCKD_V4
	553	static struct svc_version nlmsvc_version4 = {
	554	.vs_vers = 4,
	555	.vs_nproc = 24,
	556	.vs_proc = nlmsvc_procedures4,
	557	.vs_xdrsize = NLMSVC_XDRSIZE,
	558	};
	559	#endif
	560	static struct svc_version * nlmsvc_version[] = {
	561	[1] = &nlmsvc_version1,
	562	[3] = &nlmsvc_version3,
	563	#ifdef CONFIG_LOCKD_V4
	564	[4] = &nlmsvc_version4,
	565	#endif
	566	};
	567
	568	static struct svc_stat nlmsvc_stats;
	569
e8c96f8c	570	#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
1da177e4 LT	571	static struct svc_program nlmsvc_program = {
	572	.pg_prog = NLM_PROGRAM, /* program number */
	573	.pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
	574	.pg_vers = nlmsvc_version, /* version table */
	575	.pg_name = "lockd", /* service name */
	576	.pg_class = "nfsd", /* share authentication with nfsd */
	577	.pg_stats = &nlmsvc_stats, /* stats table */
	578	.pg_authenticate = &lockd_authenticate /* export authentication */
	579	};