[mirror_ubuntu-artful-kernel.git] / fs / lockd / host.c

/*
 * linux/fs/lockd/host.c
 *
 * Management for NLM peer hosts. The nlm_host struct is shared
 * between client and server implementation. The only reason to
 * do so is to reduce code bloat.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/sm_inter.h>
#include <linux/mutex.h>


#define NLMDBG_FACILITY		NLMDBG_HOSTCACHE
#define NLM_HOST_MAX		64
#define NLM_HOST_NRHASH		32
#define NLM_ADDRHASH(addr)	(ntohl(addr) & (NLM_HOST_NRHASH-1))
#define NLM_HOST_REBIND		(60 * HZ)
#define NLM_HOST_EXPIRE		((nrhosts > NLM_HOST_MAX)? 300 * HZ : 120 * HZ)
#define NLM_HOST_COLLECT	((nrhosts > NLM_HOST_MAX)? 120 * HZ :  60 * HZ)

static struct nlm_host *	nlm_hosts[NLM_HOST_NRHASH];
static unsigned long		next_gc;
static int			nrhosts;
static DEFINE_MUTEX(nlm_host_mutex);


static void			nlm_gc_hosts(void);

/*
 * Find an NLM server handle in the cache. If there is none, create it.
 */
struct nlm_host *
nlmclnt_lookup_host(struct sockaddr_in *sin, int proto, int version)
{
	return nlm_lookup_host(0, sin, proto, version);
}

/*
 * Find an NLM client handle in the cache. If there is none, create it.
 */
struct nlm_host *
nlmsvc_lookup_host(struct svc_rqst *rqstp)
{
	return nlm_lookup_host(1, &rqstp->rq_addr,
			       rqstp->rq_prot, rqstp->rq_vers);
}

/*
 * Common host lookup routine for server & client
 */
struct nlm_host *
nlm_lookup_host(int server, struct sockaddr_in *sin,
					int proto, int version)
{
	struct nlm_host	*host, **hp;
	u32		addr;
	int		hash;

	dprintk("lockd: nlm_lookup_host(%08x, p=%d, v=%d)\n",
			(unsigned)(sin? ntohl(sin->sin_addr.s_addr) : 0), proto, version);

	hash = NLM_ADDRHASH(sin->sin_addr.s_addr);

	/* Lock hash table */
	mutex_lock(&nlm_host_mutex);

	if (time_after_eq(jiffies, next_gc))
		nlm_gc_hosts();

	for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) {
		if (host->h_proto != proto)
			continue;
		if (host->h_version != version)
			continue;
		if (host->h_server != server)
			continue;

		if (nlm_cmp_addr(&host->h_addr, sin)) {
			if (hp != nlm_hosts + hash) {
				*hp = host->h_next;
				host->h_next = nlm_hosts[hash];
				nlm_hosts[hash] = host;
			}
			nlm_get_host(host);
			mutex_unlock(&nlm_host_mutex);
			return host;
		}
	}

	/* Ooops, no host found, create it */
	dprintk("lockd: creating host entry\n");

	host = kzalloc(sizeof(*host), GFP_KERNEL);
	if (!host)
		goto nohost;

	addr = sin->sin_addr.s_addr;
	sprintf(host->h_name, "%u.%u.%u.%u", NIPQUAD(addr));

	host->h_addr       = *sin;
	host->h_addr.sin_port = 0;	/* ouch! */
	host->h_version    = version;
	host->h_proto      = proto;
	host->h_rpcclnt    = NULL;
	mutex_init(&host->h_mutex);
	host->h_nextrebind = jiffies + NLM_HOST_REBIND;
	host->h_expires    = jiffies + NLM_HOST_EXPIRE;
	atomic_set(&host->h_count, 1);
	init_waitqueue_head(&host->h_gracewait);
	init_rwsem(&host->h_rwsem);
	host->h_state      = 0;			/* pseudo NSM state */
	host->h_nsmstate   = 0;			/* real NSM state */
	host->h_server	   = server;
	host->h_next       = nlm_hosts[hash];
	nlm_hosts[hash]    = host;
	INIT_LIST_HEAD(&host->h_lockowners);
	spin_lock_init(&host->h_lock);
	INIT_LIST_HEAD(&host->h_granted);
	INIT_LIST_HEAD(&host->h_reclaim);

	if (++nrhosts > NLM_HOST_MAX)
		next_gc = 0;

nohost:
	mutex_unlock(&nlm_host_mutex);
	return host;
}

struct nlm_host *
nlm_find_client(void)
{
	/* find a nlm_host for a client for which h_killed == 0.
	 * and return it
	 */
	int hash;
	mutex_lock(&nlm_host_mutex);
	for (hash = 0 ; hash < NLM_HOST_NRHASH; hash++) {
		struct nlm_host *host, **hp;
		for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) {
			if (host->h_server &&
			    host->h_killed == 0) {
				nlm_get_host(host);
				mutex_unlock(&nlm_host_mutex);
				return host;
			}
		}
	}
	mutex_unlock(&nlm_host_mutex);
	return NULL;
}

				
/*
 * Create the NLM RPC client for an NLM peer
 */
struct rpc_clnt *
nlm_bind_host(struct nlm_host *host)
{
	struct rpc_clnt	*clnt;

	dprintk("lockd: nlm_bind_host(%08x)\n",
			(unsigned)ntohl(host->h_addr.sin_addr.s_addr));

	/* Lock host handle */
	mutex_lock(&host->h_mutex);

	/* If we've already created an RPC client, check whether
	 * RPC rebind is required
	 */
	if ((clnt = host->h_rpcclnt) != NULL) {
		if (time_after_eq(jiffies, host->h_nextrebind)) {
			rpc_force_rebind(clnt);
			host->h_nextrebind = jiffies + NLM_HOST_REBIND;
			dprintk("lockd: next rebind in %ld jiffies\n",
					host->h_nextrebind - jiffies);
		}
	} else {
		unsigned long increment = nlmsvc_timeout * HZ;
		struct rpc_timeout timeparms = {
			.to_initval	= increment,
			.to_increment	= increment,
			.to_maxval	= increment * 6UL,
			.to_retries	= 5U,
		};
		struct rpc_create_args args = {
			.protocol	= host->h_proto,
			.address	= (struct sockaddr *)&host->h_addr,
			.addrsize	= sizeof(host->h_addr),
			.timeout	= &timeparms,
			.servername	= host->h_name,
			.program	= &nlm_program,
			.version	= host->h_version,
			.authflavor	= RPC_AUTH_UNIX,
			.flags		= (RPC_CLNT_CREATE_HARDRTRY |
					   RPC_CLNT_CREATE_AUTOBIND),
		};

		clnt = rpc_create(&args);
		if (!IS_ERR(clnt))
			host->h_rpcclnt = clnt;
		else {
			printk("lockd: couldn't create RPC handle for %s\n", host->h_name);
			clnt = NULL;
		}
	}

	mutex_unlock(&host->h_mutex);
	return clnt;
}

/*
 * Force a portmap lookup of the remote lockd port
 */
void
nlm_rebind_host(struct nlm_host *host)
{
	dprintk("lockd: rebind host %s\n", host->h_name);
	if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) {
		rpc_force_rebind(host->h_rpcclnt);
		host->h_nextrebind = jiffies + NLM_HOST_REBIND;
	}
}

/*
 * Increment NLM host count
 */
struct nlm_host * nlm_get_host(struct nlm_host *host)
{
	if (host) {
		dprintk("lockd: get host %s\n", host->h_name);
		atomic_inc(&host->h_count);
		host->h_expires = jiffies + NLM_HOST_EXPIRE;
	}
	return host;
}

/*
 * Release NLM host after use
 */
void nlm_release_host(struct nlm_host *host)
{
	if (host != NULL) {
		dprintk("lockd: release host %s\n", host->h_name);
		BUG_ON(atomic_read(&host->h_count) < 0);
		if (atomic_dec_and_test(&host->h_count)) {
			BUG_ON(!list_empty(&host->h_lockowners));
			BUG_ON(!list_empty(&host->h_granted));
			BUG_ON(!list_empty(&host->h_reclaim));
		}
	}
}

/*
 * Shut down the hosts module.
 * Note that this routine is called only at server shutdown time.
 */
void
nlm_shutdown_hosts(void)
{
	struct nlm_host	*host;
	int		i;

	dprintk("lockd: shutting down host module\n");
	mutex_lock(&nlm_host_mutex);

	/* First, make all hosts eligible for gc */
	dprintk("lockd: nuking all hosts...\n");
	for (i = 0; i < NLM_HOST_NRHASH; i++) {
		for (host = nlm_hosts[i]; host; host = host->h_next)
			host->h_expires = jiffies - 1;
	}

	/* Then, perform a garbage collection pass */
	nlm_gc_hosts();
	mutex_unlock(&nlm_host_mutex);

	/* complain if any hosts are left */
	if (nrhosts) {
		printk(KERN_WARNING "lockd: couldn't shutdown host module!\n");
		dprintk("lockd: %d hosts left:\n", nrhosts);
		for (i = 0; i < NLM_HOST_NRHASH; i++) {
			for (host = nlm_hosts[i]; host; host = host->h_next) {
				dprintk("       %s (cnt %d use %d exp %ld)\n",
					host->h_name, atomic_read(&host->h_count),
					host->h_inuse, host->h_expires);
			}
		}
	}
}

/*
 * Garbage collect any unused NLM hosts.
 * This GC combines reference counting for async operations with
 * mark & sweep for resources held by remote clients.
 */
static void
nlm_gc_hosts(void)
{
	struct nlm_host	**q, *host;
	struct rpc_clnt	*clnt;
	int		i;

	dprintk("lockd: host garbage collection\n");
	for (i = 0; i < NLM_HOST_NRHASH; i++) {
		for (host = nlm_hosts[i]; host; host = host->h_next)
			host->h_inuse = 0;
	}

	/* Mark all hosts that hold locks, blocks or shares */
	nlmsvc_mark_resources();

	for (i = 0; i < NLM_HOST_NRHASH; i++) {
		q = &nlm_hosts[i];
		while ((host = *q) != NULL) {
			if (atomic_read(&host->h_count) || host->h_inuse
			 || time_before(jiffies, host->h_expires)) {
				dprintk("nlm_gc_hosts skipping %s (cnt %d use %d exp %ld)\n",
					host->h_name, atomic_read(&host->h_count),
					host->h_inuse, host->h_expires);
				q = &host->h_next;
				continue;
			}
			dprintk("lockd: delete host %s\n", host->h_name);
			*q = host->h_next;

			/*
			 * Unmonitor unless host was invalidated (i.e. lockd restarted)
			 */
			nsm_unmonitor(host);

			if ((clnt = host->h_rpcclnt) != NULL) {
				if (atomic_read(&clnt->cl_users)) {
					printk(KERN_WARNING
						"lockd: active RPC handle\n");
					clnt->cl_dead = 1;
				} else {
					rpc_destroy_client(host->h_rpcclnt);
				}
			}
			kfree(host);
			nrhosts--;
		}
	}

	next_gc = jiffies + NLM_HOST_COLLECT;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/host.c
	3	*
	4	* Management for NLM peer hosts. The nlm_host struct is shared
	5	* between client and server implementation. The only reason to
	6	* do so is to reduce code bloat.
	7	*
	8	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	9	*/
	10
	11	#include <linux/types.h>
	12	#include <linux/sched.h>
	13	#include <linux/slab.h>
	14	#include <linux/in.h>
	15	#include <linux/sunrpc/clnt.h>
	16	#include <linux/sunrpc/svc.h>
	17	#include <linux/lockd/lockd.h>
	18	#include <linux/lockd/sm_inter.h>
353ab6e9	19	#include <linux/mutex.h>
1da177e4 LT	20
	21
	22	#define NLMDBG_FACILITY NLMDBG_HOSTCACHE
	23	#define NLM_HOST_MAX 64
	24	#define NLM_HOST_NRHASH 32
	25	#define NLM_ADDRHASH(addr) (ntohl(addr) & (NLM_HOST_NRHASH-1))
	26	#define NLM_HOST_REBIND (60 * HZ)
	27	#define NLM_HOST_EXPIRE ((nrhosts > NLM_HOST_MAX)? 300 * HZ : 120 * HZ)
	28	#define NLM_HOST_COLLECT ((nrhosts > NLM_HOST_MAX)? 120 * HZ : 60 * HZ)
1da177e4 LT	29
	30	static struct nlm_host * nlm_hosts[NLM_HOST_NRHASH];
	31	static unsigned long next_gc;
	32	static int nrhosts;
353ab6e9	33	static DEFINE_MUTEX(nlm_host_mutex);
1da177e4 LT	34
	35
	36	static void nlm_gc_hosts(void);
	37
	38	/*
	39	* Find an NLM server handle in the cache. If there is none, create it.
	40	*/
	41	struct nlm_host *
	42	nlmclnt_lookup_host(struct sockaddr_in *sin, int proto, int version)
	43	{
	44	return nlm_lookup_host(0, sin, proto, version);
	45	}
	46
	47	/*
	48	* Find an NLM client handle in the cache. If there is none, create it.
	49	*/
	50	struct nlm_host *
	51	nlmsvc_lookup_host(struct svc_rqst *rqstp)
	52	{
	53	return nlm_lookup_host(1, &rqstp->rq_addr,
	54	rqstp->rq_prot, rqstp->rq_vers);
	55	}
	56
	57	/*
	58	* Common host lookup routine for server & client
	59	*/
	60	struct nlm_host *
	61	nlm_lookup_host(int server, struct sockaddr_in *sin,
	62	int proto, int version)
	63	{
	64	struct nlm_host host, *hp;
	65	u32 addr;
	66	int hash;
	67
	68	dprintk("lockd: nlm_lookup_host(%08x, p=%d, v=%d)\n",
	69	(unsigned)(sin? ntohl(sin->sin_addr.s_addr) : 0), proto, version);
	70
	71	hash = NLM_ADDRHASH(sin->sin_addr.s_addr);
	72
	73	/* Lock hash table */
353ab6e9	74	mutex_lock(&nlm_host_mutex);
1da177e4 LT	75
	76	if (time_after_eq(jiffies, next_gc))
	77	nlm_gc_hosts();
	78
	79	for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) {
	80	if (host->h_proto != proto)
	81	continue;
	82	if (host->h_version != version)
	83	continue;
	84	if (host->h_server != server)
	85	continue;
	86
	87	if (nlm_cmp_addr(&host->h_addr, sin)) {
	88	if (hp != nlm_hosts + hash) {
	89	*hp = host->h_next;
	90	host->h_next = nlm_hosts[hash];
	91	nlm_hosts[hash] = host;
	92	}
	93	nlm_get_host(host);
353ab6e9	94	mutex_unlock(&nlm_host_mutex);
1da177e4 LT	95	return host;
	96	}
	97	}
	98
	99	/* Ooops, no host found, create it */
	100	dprintk("lockd: creating host entry\n");
	101
f8314dc6 PI	102	host = kzalloc(sizeof(*host), GFP_KERNEL);
f8314dc6 PI	103	if (!host)
1da177e4	104	goto nohost;
1da177e4 LT	105
	106	addr = sin->sin_addr.s_addr;
	107	sprintf(host->h_name, "%u.%u.%u.%u", NIPQUAD(addr));
	108
	109	host->h_addr = *sin;
	110	host->h_addr.sin_port = 0; /* ouch! */
	111	host->h_version = version;
	112	host->h_proto = proto;
	113	host->h_rpcclnt = NULL;
50467914	114	mutex_init(&host->h_mutex);
1da177e4 LT	115	host->h_nextrebind = jiffies + NLM_HOST_REBIND;
	116	host->h_expires = jiffies + NLM_HOST_EXPIRE;
	117	atomic_set(&host->h_count, 1);
	118	init_waitqueue_head(&host->h_gracewait);
28df955a	119	init_rwsem(&host->h_rwsem);
1da177e4 LT	120	host->h_state = 0; /* pseudo NSM state */
	121	host->h_nsmstate = 0; /* real NSM state */
	122	host->h_server = server;
	123	host->h_next = nlm_hosts[hash];
	124	nlm_hosts[hash] = host;
	125	INIT_LIST_HEAD(&host->h_lockowners);
	126	spin_lock_init(&host->h_lock);
26bcbf96 CH	127	INIT_LIST_HEAD(&host->h_granted);
26bcbf96 CH	128	INIT_LIST_HEAD(&host->h_reclaim);
1da177e4 LT	129
	130	if (++nrhosts > NLM_HOST_MAX)
	131	next_gc = 0;
	132
	133	nohost:
353ab6e9	134	mutex_unlock(&nlm_host_mutex);
1da177e4 LT	135	return host;
	136	}
	137
	138	struct nlm_host *
	139	nlm_find_client(void)
	140	{
	141	/* find a nlm_host for a client for which h_killed == 0.
	142	* and return it
	143	*/
	144	int hash;
353ab6e9	145	mutex_lock(&nlm_host_mutex);
1da177e4 LT	146	for (hash = 0 ; hash < NLM_HOST_NRHASH; hash++) {
	147	struct nlm_host host, *hp;
	148	for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) {
	149	if (host->h_server &&
	150	host->h_killed == 0) {
	151	nlm_get_host(host);
353ab6e9	152	mutex_unlock(&nlm_host_mutex);
1da177e4 LT	153	return host;
	154	}
	155	}
	156	}
353ab6e9	157	mutex_unlock(&nlm_host_mutex);
1da177e4 LT	158	return NULL;
	159	}
	160
	161
	162	/*
	163	* Create the NLM RPC client for an NLM peer
	164	*/
	165	struct rpc_clnt *
	166	nlm_bind_host(struct nlm_host *host)
	167	{
	168	struct rpc_clnt *clnt;
1da177e4 LT	169
	170	dprintk("lockd: nlm_bind_host(%08x)\n",
	171	(unsigned)ntohl(host->h_addr.sin_addr.s_addr));
	172
	173	/* Lock host handle */
50467914	174	mutex_lock(&host->h_mutex);
1da177e4 LT	175
	176	/* If we've already created an RPC client, check whether
	177	* RPC rebind is required
1da177e4 LT	178	*/
1da177e4 LT	179	if ((clnt = host->h_rpcclnt) != NULL) {
43118c29	180	if (time_after_eq(jiffies, host->h_nextrebind)) {
35f5a422	181	rpc_force_rebind(clnt);
1da177e4 LT	182	host->h_nextrebind = jiffies + NLM_HOST_REBIND;
	183	dprintk("lockd: next rebind in %ld jiffies\n",
	184	host->h_nextrebind - jiffies);
	185	}
	186	} else {
e1ec7892 CL	187	unsigned long increment = nlmsvc_timeout * HZ;
	188	struct rpc_timeout timeparms = {
	189	.to_initval = increment,
	190	.to_increment = increment,
	191	.to_maxval = increment * 6UL,
	192	.to_retries = 5U,
	193	};
	194	struct rpc_create_args args = {
	195	.protocol = host->h_proto,
	196	.address = (struct sockaddr *)&host->h_addr,
	197	.addrsize = sizeof(host->h_addr),
	198	.timeout = &timeparms,
	199	.servername = host->h_name,
	200	.program = &nlm_program,
	201	.version = host->h_version,
	202	.authflavor = RPC_AUTH_UNIX,
	203	.flags = (RPC_CLNT_CREATE_HARDRTRY \|
	204	RPC_CLNT_CREATE_AUTOBIND),
	205	};
	206
	207	clnt = rpc_create(&args);
	208	if (!IS_ERR(clnt))
	209	host->h_rpcclnt = clnt;
	210	else {
	211	printk("lockd: couldn't create RPC handle for %s\n", host->h_name);
	212	clnt = NULL;
	213	}
1da177e4 LT	214	}
1da177e4 LT	215
50467914	216	mutex_unlock(&host->h_mutex);
1da177e4	217	return clnt;
1da177e4 LT	218	}
	219
	220	/*
	221	* Force a portmap lookup of the remote lockd port
	222	*/
	223	void
	224	nlm_rebind_host(struct nlm_host *host)
	225	{
	226	dprintk("lockd: rebind host %s\n", host->h_name);
	227	if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) {
35f5a422	228	rpc_force_rebind(host->h_rpcclnt);
1da177e4 LT	229	host->h_nextrebind = jiffies + NLM_HOST_REBIND;
	230	}
	231	}
	232
	233	/*
	234	* Increment NLM host count
	235	*/
	236	struct nlm_host * nlm_get_host(struct nlm_host *host)
	237	{
	238	if (host) {
	239	dprintk("lockd: get host %s\n", host->h_name);
	240	atomic_inc(&host->h_count);
	241	host->h_expires = jiffies + NLM_HOST_EXPIRE;
	242	}
	243	return host;
	244	}
	245
	246	/*
	247	* Release NLM host after use
	248	*/
	249	void nlm_release_host(struct nlm_host *host)
	250	{
	251	if (host != NULL) {
	252	dprintk("lockd: release host %s\n", host->h_name);
1da177e4	253	BUG_ON(atomic_read(&host->h_count) < 0);
4c060b53 TM	254	if (atomic_dec_and_test(&host->h_count)) {
	255	BUG_ON(!list_empty(&host->h_lockowners));
	256	BUG_ON(!list_empty(&host->h_granted));
	257	BUG_ON(!list_empty(&host->h_reclaim));
	258	}
1da177e4 LT	259	}
	260	}
	261
	262	/*
	263	* Shut down the hosts module.
	264	* Note that this routine is called only at server shutdown time.
	265	*/
	266	void
	267	nlm_shutdown_hosts(void)
	268	{
	269	struct nlm_host *host;
	270	int i;
	271
	272	dprintk("lockd: shutting down host module\n");
353ab6e9	273	mutex_lock(&nlm_host_mutex);
1da177e4 LT	274
	275	/* First, make all hosts eligible for gc */
	276	dprintk("lockd: nuking all hosts...\n");
	277	for (i = 0; i < NLM_HOST_NRHASH; i++) {
	278	for (host = nlm_hosts[i]; host; host = host->h_next)
	279	host->h_expires = jiffies - 1;
	280	}
	281
	282	/* Then, perform a garbage collection pass */
	283	nlm_gc_hosts();
353ab6e9	284	mutex_unlock(&nlm_host_mutex);
1da177e4 LT	285
	286	/* complain if any hosts are left */
	287	if (nrhosts) {
	288	printk(KERN_WARNING "lockd: couldn't shutdown host module!\n");
	289	dprintk("lockd: %d hosts left:\n", nrhosts);
	290	for (i = 0; i < NLM_HOST_NRHASH; i++) {
	291	for (host = nlm_hosts[i]; host; host = host->h_next) {
	292	dprintk(" %s (cnt %d use %d exp %ld)\n",
	293	host->h_name, atomic_read(&host->h_count),
	294	host->h_inuse, host->h_expires);
	295	}
	296	}
	297	}
	298	}
	299
	300	/*
	301	* Garbage collect any unused NLM hosts.
	302	* This GC combines reference counting for async operations with
	303	* mark & sweep for resources held by remote clients.
	304	*/
	305	static void
	306	nlm_gc_hosts(void)
	307	{
	308	struct nlm_host *q, host;
	309	struct rpc_clnt *clnt;
	310	int i;
	311
	312	dprintk("lockd: host garbage collection\n");
	313	for (i = 0; i < NLM_HOST_NRHASH; i++) {
	314	for (host = nlm_hosts[i]; host; host = host->h_next)
	315	host->h_inuse = 0;
	316	}
	317
	318	/* Mark all hosts that hold locks, blocks or shares */
	319	nlmsvc_mark_resources();
	320
	321	for (i = 0; i < NLM_HOST_NRHASH; i++) {
	322	q = &nlm_hosts[i];
	323	while ((host = *q) != NULL) {
	324	if (atomic_read(&host->h_count) \|\| host->h_inuse
	325	\|\| time_before(jiffies, host->h_expires)) {
	326	dprintk("nlm_gc_hosts skipping %s (cnt %d use %d exp %ld)\n",
	327	host->h_name, atomic_read(&host->h_count),
	328	host->h_inuse, host->h_expires);
	329	q = &host->h_next;
	330	continue;
	331	}
	332	dprintk("lockd: delete host %s\n", host->h_name);
	333	*q = host->h_next;
977faf39 OK	334
	335	/*
	336	* Unmonitor unless host was invalidated (i.e. lockd restarted)
	337	*/
	338	nsm_unmonitor(host);
	339
1da177e4 LT	340	if ((clnt = host->h_rpcclnt) != NULL) {
	341	if (atomic_read(&clnt->cl_users)) {
	342	printk(KERN_WARNING
	343	"lockd: active RPC handle\n");
	344	clnt->cl_dead = 1;
	345	} else {
	346	rpc_destroy_client(host->h_rpcclnt);
	347	}
	348	}
1da177e4 LT	349	kfree(host);
	350	nrhosts--;
	351	}
	352	}
	353
	354	next_gc = jiffies + NLM_HOST_COLLECT;
	355	}
	356