[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/slab.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/mutex.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/lockd/sm_inter.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 DEFINE_MUTEX(nlmsvc_mutex);
static unsigned int		nlmsvc_users;
static pid_t			nlmsvc_pid;
static struct svc_serv		*nlmsvc_serv;
int				nlmsvc_grace_period;
unsigned long			nlmsvc_timeout;

static DECLARE_COMPLETION(lockd_start_done);
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;
int				nsm_use_hostnames = 0;

/*
 * 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)
{
	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;
	nlmsvc_serv = rqstp->rq_server;
	complete(&lockd_start_done);

	daemonize("lockd");

	/* Process request with signals blocked, but allow SIGKILL.  */
	allow_signal(SIGKILL);

	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;
		char buf[RPC_MAX_ADDRBUFLEN];

		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(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 %s\n",
				svc_print_addr(rqstp, buf, sizeof(buf)));

		svc_process(rqstp);
	}

	flush_signals(current);

	/*
	 * 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;
		nlmsvc_serv = NULL;
	} else
		printk(KERN_DEBUG
			"lockd: new process, skipping host shutdown\n");
	wake_up(&lockd_exit);

	/* Exit the RPC thread */
	svc_exit_thread(rqstp);

	/* Release module */
	unlock_kernel();
	module_put_and_exit(0);
}


static int find_socket(struct svc_serv *serv, int proto)
{
	struct svc_sock *svsk;
	int found = 0;
	list_for_each_entry(svsk, &serv->sv_permsocks, sk_list)
		if (svsk->sk_sk->sk_protocol == proto) {
			found = 1;
			break;
		}
	return found;
}

/*
 * Make any sockets that are needed but not present.
 * If nlm_udpport or nlm_tcpport were set as module
 * options, make those sockets unconditionally
 */
static int make_socks(struct svc_serv *serv, int proto)
{
	static int warned;
	int err = 0;

	if (proto == IPPROTO_UDP || nlm_udpport)
		if (!find_socket(serv, IPPROTO_UDP))
			err = svc_makesock(serv, IPPROTO_UDP, nlm_udpport,
						SVC_SOCK_DEFAULTS);
	if (err >= 0 && (proto == IPPROTO_TCP || nlm_tcpport))
		if (!find_socket(serv, IPPROTO_TCP))
			err = svc_makesock(serv, IPPROTO_TCP, nlm_tcpport,
						SVC_SOCK_DEFAULTS);

	if (err >= 0) {
		warned = 0;
		err = 0;
	} else 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(int proto) /* Maybe add a 'family' option when IPv6 is supported ?? */
{
	struct svc_serv *	serv;
	int			error = 0;

	mutex_lock(&nlmsvc_mutex);
	/*
	 * Check whether we're already up and running.
	 */
	if (nlmsvc_pid) {
		if (proto)
			error = make_socks(nlmsvc_serv, proto);
		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;
	}

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

	/*
	 * 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;
	}
	wait_for_completion(&lockd_start_done);

	/*
	 * 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(lockd_up);

/*
 * Decrement the user count and bring down lockd if we're the last.
 */
void
lockd_down(void)
{
	static int warned;

	mutex_lock(&nlmsvc_mutex);
	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:
	mutex_unlock(&nlmsvc_mutex);
}
EXPORT_SYMBOL(lockd_down);

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

static ctl_table nlm_sysctls[] = {
	{
		.ctl_name	= CTL_UNNUMBERED,
		.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,
	},
	{
		.ctl_name	= CTL_UNNUMBERED,
		.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,
	},
	{
		.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	= CTL_UNNUMBERED,
		.procname	= "nsm_use_hostnames",
		.data		= &nsm_use_hostnames,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{
		.ctl_name	= CTL_UNNUMBERED,
		.procname	= "nsm_local_state",
		.data		= &nsm_local_state,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec,
	},
	{ .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 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);

/*
 * Initialising and terminating the module.
 */

static int __init init_nlm(void)
{
	nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
	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	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>
	24	#include <linux/slab.h>
	25	#include <linux/smp.h>
	26	#include <linux/smp_lock.h>
353ab6e9	27	#include <linux/mutex.h>
1da177e4 LT	28
	29	#include <linux/sunrpc/types.h>
	30	#include <linux/sunrpc/stats.h>
	31	#include <linux/sunrpc/clnt.h>
	32	#include <linux/sunrpc/svc.h>
	33	#include <linux/sunrpc/svcsock.h>
24e36663	34	#include <net/ip.h>
1da177e4	35	#include <linux/lockd/lockd.h>
460f5cac	36	#include <linux/lockd/sm_inter.h>
1da177e4 LT	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;
	46	EXPORT_SYMBOL(nlmsvc_ops);
	47
353ab6e9	48	static DEFINE_MUTEX(nlmsvc_mutex);
1da177e4 LT	49	static unsigned int nlmsvc_users;
1da177e4 LT	50	static pid_t nlmsvc_pid;
24e36663	51	static struct svc_serv *nlmsvc_serv;
1da177e4 LT	52	int nlmsvc_grace_period;
	53	unsigned long nlmsvc_timeout;
	54
353ab6e9	55	static DECLARE_COMPLETION(lockd_start_done);
1da177e4 LT	56	static DECLARE_WAIT_QUEUE_HEAD(lockd_exit);
	57
	58	/*
	59	* These can be set at insmod time (useful for NFS as root filesystem),
	60	* and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
	61	*/
	62	static unsigned long nlm_grace_period;
	63	static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
	64	static int nlm_udpport, nlm_tcpport;
abd1f500	65	int nsm_use_hostnames = 0;
1da177e4 LT	66
	67	/*
	68	* Constants needed for the sysctl interface.
	69	*/
	70	static const unsigned long nlm_grace_period_min = 0;
	71	static const unsigned long nlm_grace_period_max = 240;
	72	static const unsigned long nlm_timeout_min = 3;
	73	static const unsigned long nlm_timeout_max = 20;
	74	static const int nlm_port_min = 0, nlm_port_max = 65535;
	75
	76	static struct ctl_table_header * nlm_sysctl_table;
	77
	78	static unsigned long set_grace_period(void)
	79	{
	80	unsigned long grace_period;
	81
	82	/* Note: nlm_timeout should always be nonzero */
	83	if (nlm_grace_period)
	84	grace_period = ((nlm_grace_period + nlm_timeout - 1)
	85	/ nlm_timeout) * nlm_timeout * HZ;
	86	else
	87	grace_period = nlm_timeout * 5 * HZ;
	88	nlmsvc_grace_period = 1;
	89	return grace_period + jiffies;
	90	}
	91
	92	static inline void clear_grace_period(void)
	93	{
	94	nlmsvc_grace_period = 0;
	95	}
	96
	97	/*
	98	* This is the lockd kernel thread
	99	*/
	100	static void
	101	lockd(struct svc_rqst *rqstp)
	102	{
1da177e4 LT	103	int err = 0;
	104	unsigned long grace_period_expire;
	105
	106	/* Lock module and set up kernel thread */
	107	/* lockd_up is waiting for us to startup, so will
	108	* be holding a reference to this module, so it
	109	* is safe to just claim another reference
	110	*/
	111	__module_get(THIS_MODULE);
	112	lock_kernel();
	113
	114	/*
	115	* Let our maker know we're running.
	116	*/
	117	nlmsvc_pid = current->pid;
6fb2b47f	118	nlmsvc_serv = rqstp->rq_server;
353ab6e9	119	complete(&lockd_start_done);
1da177e4 LT	120
	121	daemonize("lockd");
	122
	123	/* Process request with signals blocked, but allow SIGKILL. */
	124	allow_signal(SIGKILL);
	125
1da177e4 LT	126	dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
	127
	128	if (!nlm_timeout)
	129	nlm_timeout = LOCKD_DFLT_TIMEO;
	130	nlmsvc_timeout = nlm_timeout * HZ;
	131
	132	grace_period_expire = set_grace_period();
	133
	134	/*
	135	* The main request loop. We don't terminate until the last
	136	* NFS mount or NFS daemon has gone away, and we've been sent a
	137	* signal, or else another process has taken over our job.
	138	*/
	139	while ((nlmsvc_users \|\| !signalled()) && nlmsvc_pid == current->pid) {
	140	long timeout = MAX_SCHEDULE_TIMEOUT;
ad06e4bd	141	char buf[RPC_MAX_ADDRBUFLEN];
1da177e4 LT	142
	143	if (signalled()) {
	144	flush_signals(current);
	145	if (nlmsvc_ops) {
	146	nlmsvc_invalidate_all();
	147	grace_period_expire = set_grace_period();
	148	}
	149	}
	150
	151	/*
	152	* Retry any blocked locks that have been notified by
	153	* the VFS. Don't do this during grace period.
	154	* (Theoretically, there shouldn't even be blocked locks
	155	* during grace period).
	156	*/
	157	if (!nlmsvc_grace_period) {
	158	timeout = nlmsvc_retry_blocked();
	159	} else if (time_before(grace_period_expire, jiffies))
	160	clear_grace_period();
	161
	162	/*
	163	* Find a socket with data available and call its
	164	* recvfrom routine.
	165	*/
6fb2b47f	166	err = svc_recv(rqstp, timeout);
1da177e4 LT	167	if (err == -EAGAIN \|\| err == -EINTR)
	168	continue;
	169	if (err < 0) {
	170	printk(KERN_WARNING
	171	"lockd: terminating on error %d\n",
	172	-err);
	173	break;
	174	}
	175
ad06e4bd CL	176	dprintk("lockd: request from %s\n",
ad06e4bd CL	177	svc_print_addr(rqstp, buf, sizeof(buf)));
1da177e4	178
6fb2b47f	179	svc_process(rqstp);
1da177e4 LT	180	}
1da177e4 LT	181
2bd61579 TM	182	flush_signals(current);
2bd61579 TM	183
1da177e4 LT	184	/*
	185	* Check whether there's a new lockd process before
	186	* shutting down the hosts and clearing the slot.
	187	*/
	188	if (!nlmsvc_pid \|\| current->pid == nlmsvc_pid) {
	189	if (nlmsvc_ops)
	190	nlmsvc_invalidate_all();
	191	nlm_shutdown_hosts();
	192	nlmsvc_pid = 0;
24e36663	193	nlmsvc_serv = NULL;
1da177e4 LT	194	} else
	195	printk(KERN_DEBUG
	196	"lockd: new process, skipping host shutdown\n");
	197	wake_up(&lockd_exit);
46be925f	198
1da177e4 LT	199	/* Exit the RPC thread */
	200	svc_exit_thread(rqstp);
	201
1da177e4 LT	202	/* Release module */
	203	unlock_kernel();
	204	module_put_and_exit(0);
	205	}
	206
24e36663 N	207
	208	static int find_socket(struct svc_serv *serv, int proto)
	209	{
	210	struct svc_sock *svsk;
	211	int found = 0;
	212	list_for_each_entry(svsk, &serv->sv_permsocks, sk_list)
	213	if (svsk->sk_sk->sk_protocol == proto) {
	214	found = 1;
	215	break;
	216	}
	217	return found;
	218	}
	219
482fb94e CL	220	/*
	221	* Make any sockets that are needed but not present.
	222	* If nlm_udpport or nlm_tcpport were set as module
	223	* options, make those sockets unconditionally
	224	*/
24e36663 N	225	static int make_socks(struct svc_serv *serv, int proto)
24e36663 N	226	{
482fb94e	227	static int warned;
24e36663	228	int err = 0;
482fb94e	229
24e36663 N	230	if (proto == IPPROTO_UDP \|\| nlm_udpport)
24e36663 N	231	if (!find_socket(serv, IPPROTO_UDP))
482fb94e CL	232	err = svc_makesock(serv, IPPROTO_UDP, nlm_udpport,
	233	SVC_SOCK_DEFAULTS);
	234	if (err >= 0 && (proto == IPPROTO_TCP \|\| nlm_tcpport))
24e36663	235	if (!find_socket(serv, IPPROTO_TCP))
482fb94e CL	236	err = svc_makesock(serv, IPPROTO_TCP, nlm_tcpport,
	237	SVC_SOCK_DEFAULTS);
	238
	239	if (err >= 0) {
7dcf91ec	240	warned = 0;
482fb94e CL	241	err = 0;
482fb94e CL	242	} else if (warned++ == 0)
7dcf91ec N	243	printk(KERN_WARNING
7dcf91ec N	244	"lockd_up: makesock failed, error=%d\n", err);
24e36663 N	245	return err;
	246	}
	247
1da177e4 LT	248	/*
	249	* Bring up the lockd process if it's not already up.
	250	*/
	251	int
24e36663	252	lockd_up(int proto) /* Maybe add a 'family' option when IPv6 is supported ?? */
1da177e4	253	{
1da177e4 LT	254	struct svc_serv * serv;
	255	int error = 0;
	256
353ab6e9	257	mutex_lock(&nlmsvc_mutex);
1da177e4 LT	258	/*
	259	* Check whether we're already up and running.
	260	*/
24e36663	261	if (nlmsvc_pid) {
4a3ae42d N	262	if (proto)
4a3ae42d N	263	error = make_socks(nlmsvc_serv, proto);
1da177e4	264	goto out;
24e36663	265	}
1da177e4 LT	266
	267	/*
	268	* Sanity check: if there's no pid,
	269	* we should be the first user ...
	270	*/
4a3ae42d	271	if (nlmsvc_users)
1da177e4 LT	272	printk(KERN_WARNING
	273	"lockd_up: no pid, %d users??\n", nlmsvc_users);
	274
	275	error = -ENOMEM;
bc591ccf	276	serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
1da177e4 LT	277	if (!serv) {
	278	printk(KERN_WARNING "lockd_up: create service failed\n");
	279	goto out;
	280	}
	281
7dcf91ec	282	if ((error = make_socks(serv, proto)) < 0)
1da177e4	283	goto destroy_and_out;
1da177e4 LT	284
	285	/*
	286	* Create the kernel thread and wait for it to start.
	287	*/
	288	error = svc_create_thread(lockd, serv);
	289	if (error) {
	290	printk(KERN_WARNING
	291	"lockd_up: create thread failed, error=%d\n", error);
	292	goto destroy_and_out;
	293	}
353ab6e9	294	wait_for_completion(&lockd_start_done);
1da177e4 LT	295
	296	/*
	297	* Note: svc_serv structures have an initial use count of 1,
	298	* so we exit through here on both success and failure.
	299	*/
	300	destroy_and_out:
	301	svc_destroy(serv);
	302	out:
4a3ae42d N	303	if (!error)
4a3ae42d N	304	nlmsvc_users++;
353ab6e9	305	mutex_unlock(&nlmsvc_mutex);
1da177e4 LT	306	return error;
	307	}
	308	EXPORT_SYMBOL(lockd_up);
	309
	310	/*
	311	* Decrement the user count and bring down lockd if we're the last.
	312	*/
	313	void
	314	lockd_down(void)
	315	{
	316	static int warned;
	317
353ab6e9	318	mutex_lock(&nlmsvc_mutex);
1da177e4 LT	319	if (nlmsvc_users) {
	320	if (--nlmsvc_users)
	321	goto out;
	322	} else
	323	printk(KERN_WARNING "lockd_down: no users! pid=%d\n", nlmsvc_pid);
	324
	325	if (!nlmsvc_pid) {
	326	if (warned++ == 0)
	327	printk(KERN_WARNING "lockd_down: no lockd running.\n");
	328	goto out;
	329	}
	330	warned = 0;
	331
	332	kill_proc(nlmsvc_pid, SIGKILL, 1);
	333	/*
	334	* Wait for the lockd process to exit, but since we're holding
	335	* the lockd semaphore, we can't wait around forever ...
	336	*/
	337	clear_thread_flag(TIF_SIGPENDING);
	338	interruptible_sleep_on_timeout(&lockd_exit, HZ);
	339	if (nlmsvc_pid) {
	340	printk(KERN_WARNING
	341	"lockd_down: lockd failed to exit, clearing pid\n");
	342	nlmsvc_pid = 0;
	343	}
	344	spin_lock_irq(&current->sighand->siglock);
	345	recalc_sigpending();
	346	spin_unlock_irq(&current->sighand->siglock);
	347	out:
353ab6e9	348	mutex_unlock(&nlmsvc_mutex);
1da177e4 LT	349	}
	350	EXPORT_SYMBOL(lockd_down);
	351
	352	/*
	353	* Sysctl parameters (same as module parameters, different interface).
	354	*/
	355
1da177e4 LT	356	static ctl_table nlm_sysctls[] = {
	357	{
	358	.ctl_name = CTL_UNNUMBERED,
	359	.procname = "nlm_grace_period",
	360	.data = &nlm_grace_period,
7ee91ec1	361	.maxlen = sizeof(unsigned long),
1da177e4 LT	362	.mode = 0644,
	363	.proc_handler = &proc_doulongvec_minmax,
	364	.extra1 = (unsigned long *) &nlm_grace_period_min,
	365	.extra2 = (unsigned long *) &nlm_grace_period_max,
	366	},
	367	{
	368	.ctl_name = CTL_UNNUMBERED,
	369	.procname = "nlm_timeout",
	370	.data = &nlm_timeout,
7ee91ec1	371	.maxlen = sizeof(unsigned long),
1da177e4 LT	372	.mode = 0644,
	373	.proc_handler = &proc_doulongvec_minmax,
	374	.extra1 = (unsigned long *) &nlm_timeout_min,
	375	.extra2 = (unsigned long *) &nlm_timeout_max,
	376	},
	377	{
	378	.ctl_name = CTL_UNNUMBERED,
	379	.procname = "nlm_udpport",
	380	.data = &nlm_udpport,
	381	.maxlen = sizeof(int),
	382	.mode = 0644,
	383	.proc_handler = &proc_dointvec_minmax,
	384	.extra1 = (int *) &nlm_port_min,
	385	.extra2 = (int *) &nlm_port_max,
	386	},
	387	{
	388	.ctl_name = CTL_UNNUMBERED,
	389	.procname = "nlm_tcpport",
	390	.data = &nlm_tcpport,
	391	.maxlen = sizeof(int),
	392	.mode = 0644,
	393	.proc_handler = &proc_dointvec_minmax,
	394	.extra1 = (int *) &nlm_port_min,
	395	.extra2 = (int *) &nlm_port_max,
	396	},
abd1f500 OK	397	{
	398	.ctl_name = CTL_UNNUMBERED,
	399	.procname = "nsm_use_hostnames",
	400	.data = &nsm_use_hostnames,
	401	.maxlen = sizeof(int),
	402	.mode = 0644,
	403	.proc_handler = &proc_dointvec,
	404	},
460f5cac OK	405	{
	406	.ctl_name = CTL_UNNUMBERED,
	407	.procname = "nsm_local_state",
	408	.data = &nsm_local_state,
	409	.maxlen = sizeof(int),
	410	.mode = 0644,
	411	.proc_handler = &proc_dointvec,
	412	},
1da177e4 LT	413	{ .ctl_name = 0 }
	414	};
	415
	416	static ctl_table nlm_sysctl_dir[] = {
	417	{
	418	.ctl_name = CTL_UNNUMBERED,
	419	.procname = "nfs",
	420	.mode = 0555,
	421	.child = nlm_sysctls,
	422	},
	423	{ .ctl_name = 0 }
	424	};
	425
	426	static ctl_table nlm_sysctl_root[] = {
	427	{
	428	.ctl_name = CTL_FS,
	429	.procname = "fs",
	430	.mode = 0555,
	431	.child = nlm_sysctl_dir,
	432	},
	433	{ .ctl_name = 0 }
	434	};
	435
	436	/*
405ae7d3	437	* Module (and sysfs) parameters.
1da177e4 LT	438	*/
	439
	440	#define param_set_min_max(name, type, which_strtol, min, max) \
	441	static int param_set_##name(const char val, struct kernel_param kp) \
	442	{ \
	443	char *endp; \
	444	__typeof__(type) num = which_strtol(val, &endp, 0); \
	445	if (endp == val \|\| *endp \|\| num < (min) \|\| num > (max)) \
	446	return -EINVAL; \
	447	((int ) kp->arg) = num; \
	448	return 0; \
	449	}
	450
	451	static inline int is_callback(u32 proc)
	452	{
	453	return proc == NLMPROC_GRANTED
	454	\|\| proc == NLMPROC_GRANTED_MSG
	455	\|\| proc == NLMPROC_TEST_RES
	456	\|\| proc == NLMPROC_LOCK_RES
	457	\|\| proc == NLMPROC_CANCEL_RES
	458	\|\| proc == NLMPROC_UNLOCK_RES
	459	\|\| proc == NLMPROC_NSM_NOTIFY;
	460	}
	461
	462
	463	static int lockd_authenticate(struct svc_rqst *rqstp)
	464	{
	465	rqstp->rq_client = NULL;
	466	switch (rqstp->rq_authop->flavour) {
	467	case RPC_AUTH_NULL:
	468	case RPC_AUTH_UNIX:
	469	if (rqstp->rq_proc == 0)
	470	return SVC_OK;
	471	if (is_callback(rqstp->rq_proc)) {
	472	/* Leave it to individual procedures to
	473	* call nlmsvc_lookup_host(rqstp)
	474	*/
	475	return SVC_OK;
	476	}
	477	return svc_set_client(rqstp);
	478	}
	479	return SVC_DENIED;
	480	}
	481
	482
	483	param_set_min_max(port, int, simple_strtol, 0, 65535)
	484	param_set_min_max(grace_period, unsigned long, simple_strtoul,
	485	nlm_grace_period_min, nlm_grace_period_max)
	486	param_set_min_max(timeout, unsigned long, simple_strtoul,
	487	nlm_timeout_min, nlm_timeout_max)
	488
	489	MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
	490	MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
	491	MODULE_LICENSE("GPL");
	492
	493	module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
	494	&nlm_grace_period, 0644);
	495	module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
	496	&nlm_timeout, 0644);
	497	module_param_call(nlm_udpport, param_set_port, param_get_int,
	498	&nlm_udpport, 0644);
	499	module_param_call(nlm_tcpport, param_set_port, param_get_int,
	500	&nlm_tcpport, 0644);
abd1f500	501	module_param(nsm_use_hostnames, bool, 0644);
1da177e4 LT	502
	503	/*
	504	* Initialising and terminating the module.
	505	*/
	506
	507	static int __init init_nlm(void)
	508	{
0b4d4147	509	nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
1da177e4 LT	510	return nlm_sysctl_table ? 0 : -ENOMEM;
	511	}
	512
	513	static void __exit exit_nlm(void)
	514	{
	515	/* FIXME: delete all NLM clients */
	516	nlm_shutdown_hosts();
	517	unregister_sysctl_table(nlm_sysctl_table);
	518	}
	519
	520	module_init(init_nlm);
	521	module_exit(exit_nlm);
	522
	523	/*
	524	* Define NLM program and procedures
	525	*/
	526	static struct svc_version nlmsvc_version1 = {
	527	.vs_vers = 1,
	528	.vs_nproc = 17,
	529	.vs_proc = nlmsvc_procedures,
	530	.vs_xdrsize = NLMSVC_XDRSIZE,
	531	};
	532	static struct svc_version nlmsvc_version3 = {
	533	.vs_vers = 3,
	534	.vs_nproc = 24,
	535	.vs_proc = nlmsvc_procedures,
	536	.vs_xdrsize = NLMSVC_XDRSIZE,
	537	};
	538	#ifdef CONFIG_LOCKD_V4
	539	static struct svc_version nlmsvc_version4 = {
	540	.vs_vers = 4,
	541	.vs_nproc = 24,
	542	.vs_proc = nlmsvc_procedures4,
	543	.vs_xdrsize = NLMSVC_XDRSIZE,
	544	};
	545	#endif
	546	static struct svc_version * nlmsvc_version[] = {
	547	[1] = &nlmsvc_version1,
	548	[3] = &nlmsvc_version3,
	549	#ifdef CONFIG_LOCKD_V4
	550	[4] = &nlmsvc_version4,
	551	#endif
	552	};
	553
	554	static struct svc_stat nlmsvc_stats;
	555
e8c96f8c	556	#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
1da177e4 LT	557	static struct svc_program nlmsvc_program = {
	558	.pg_prog = NLM_PROGRAM, /* program number */
	559	.pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
	560	.pg_vers = nlmsvc_version, /* version table */
	561	.pg_name = "lockd", /* service name */
	562	.pg_class = "nfsd", /* share authentication with nfsd */
	563	.pg_stats = &nlmsvc_stats, /* stats table */
	564	.pg_authenticate = &lockd_authenticate /* export authentication */
	565	};