[net-next-2.6.git] / fs / nfsd / nfssvc.c

/*
 * linux/fs/nfsd/nfssvc.c
 *
 * Central processing for nfsd.
 *
 * Authors:	Olaf Kirch (okir@monad.swb.de)
 *
 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/config.h>
#include <linux/module.h>

#include <linux/time.h>
#include <linux/errno.h>
#include <linux/nfs.h>
#include <linux/in.h>
#include <linux/uio.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/fs_struct.h>

#include <linux/sunrpc/types.h>
#include <linux/sunrpc/stats.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/cache.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/stats.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/syscall.h>
#include <linux/lockd/bind.h>
#include <linux/nfsacl.h>

#define NFSDDBG_FACILITY	NFSDDBG_SVC

/* these signals will be delivered to an nfsd thread 
 * when handling a request
 */
#define ALLOWED_SIGS	(sigmask(SIGKILL))
/* these signals will be delivered to an nfsd thread
 * when not handling a request. i.e. when waiting
 */
#define SHUTDOWN_SIGS	(sigmask(SIGKILL) | sigmask(SIGHUP) | sigmask(SIGINT) | sigmask(SIGQUIT))
/* if the last thread dies with SIGHUP, then the exports table is
 * left unchanged ( like 2.4-{0-9} ).  Any other signal will clear
 * the exports table (like 2.2).
 */
#define	SIG_NOCLEAN	SIGHUP

extern struct svc_program	nfsd_program;
static void			nfsd(struct svc_rqst *rqstp);
struct timeval			nfssvc_boot;
       struct svc_serv 		*nfsd_serv;
static atomic_t			nfsd_busy;
static unsigned long		nfsd_last_call;
static DEFINE_SPINLOCK(nfsd_call_lock);

struct nfsd_list {
	struct list_head 	list;
	struct task_struct	*task;
};
static struct list_head nfsd_list = LIST_HEAD_INIT(nfsd_list);

static struct svc_version *	nfsd_version[] = {
	[2] = &nfsd_version2,
#if defined(CONFIG_NFSD_V3)
	[3] = &nfsd_version3,
#endif
#if defined(CONFIG_NFSD_V4)
	[4] = &nfsd_version4,
#endif
};

#define NFSD_MINVERS    	2
#define NFSD_NRVERS		(sizeof(nfsd_version)/sizeof(nfsd_version[0]))
static struct svc_version *nfsd_versions[NFSD_NRVERS];

struct svc_program		nfsd_program = {
	.pg_prog		= NFS_PROGRAM,		/* program number */
	.pg_nvers		= NFSD_NRVERS,		/* nr of entries in nfsd_version */
	.pg_vers		= nfsd_versions,	/* version table */
	.pg_name		= "nfsd",		/* program name */
	.pg_class		= "nfsd",		/* authentication class */
	.pg_stats		= &nfsd_svcstats,	/* version table */
	.pg_authenticate	= &svc_set_client,	/* export authentication */

};

/*
 * Maximum number of nfsd processes
 */
#define	NFSD_MAXSERVS		8192

int nfsd_nrthreads(void)
{
	if (nfsd_serv == NULL)
		return 0;
	else
		return nfsd_serv->sv_nrthreads;
}

int
nfsd_svc(unsigned short port, int nrservs)
{
	int	error;
	int	none_left, found_one, i;
	struct list_head *victim;
	
	lock_kernel();
	dprintk("nfsd: creating service: vers 0x%x\n",
		nfsd_versbits);
	error = -EINVAL;
	if (nrservs <= 0)
		nrservs = 0;
	if (nrservs > NFSD_MAXSERVS)
		nrservs = NFSD_MAXSERVS;
	
	/* Readahead param cache - will no-op if it already exists */
	error =	nfsd_racache_init(2*nrservs);
	if (error<0)
		goto out;
	error = nfs4_state_start();
	if (error<0)
		goto out;
	if (!nfsd_serv) {
		/*
		 * Use the nfsd_ctlbits to define which
		 * versions that will be advertised.
		 * If nfsd_ctlbits doesn't list any version,
		 * export them all.
		 */
		found_one = 0;

		for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
			if (NFSCTL_VERISSET(nfsd_versbits, i)) {
				nfsd_program.pg_vers[i] = nfsd_version[i];
				found_one = 1;
			} else
				nfsd_program.pg_vers[i] = NULL;
		}

		if (!found_one) {
			for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
				nfsd_program.pg_vers[i] = nfsd_version[i];
		}

		atomic_set(&nfsd_busy, 0);
		error = -ENOMEM;
		nfsd_serv = svc_create(&nfsd_program, NFSD_BUFSIZE);
		if (nfsd_serv == NULL)
			goto out;
		error = svc_makesock(nfsd_serv, IPPROTO_UDP, port);
		if (error < 0)
			goto failure;

#ifdef CONFIG_NFSD_TCP
		error = svc_makesock(nfsd_serv, IPPROTO_TCP, port);
		if (error < 0)
			goto failure;
#endif
		do_gettimeofday(&nfssvc_boot);		/* record boot time */
	} else
		nfsd_serv->sv_nrthreads++;
	nrservs -= (nfsd_serv->sv_nrthreads-1);
	while (nrservs > 0) {
		nrservs--;
		__module_get(THIS_MODULE);
		error = svc_create_thread(nfsd, nfsd_serv);
		if (error < 0) {
			module_put(THIS_MODULE);
			break;
		}
	}
	victim = nfsd_list.next;
	while (nrservs < 0 && victim != &nfsd_list) {
		struct nfsd_list *nl =
			list_entry(victim,struct nfsd_list, list);
		victim = victim->next;
		send_sig(SIG_NOCLEAN, nl->task, 1);
		nrservs++;
	}
 failure:
	none_left = (nfsd_serv->sv_nrthreads == 1);
	svc_destroy(nfsd_serv);		/* Release server */
	if (none_left) {
		nfsd_serv = NULL;
		nfsd_racache_shutdown();
		nfs4_state_shutdown();
	}
 out:
	unlock_kernel();
	return error;
}

static inline void
update_thread_usage(int busy_threads)
{
	unsigned long prev_call;
	unsigned long diff;
	int decile;

	spin_lock(&nfsd_call_lock);
	prev_call = nfsd_last_call;
	nfsd_last_call = jiffies;
	decile = busy_threads*10/nfsdstats.th_cnt;
	if (decile>0 && decile <= 10) {
		diff = nfsd_last_call - prev_call;
		if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP)
			nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP;
		if (decile == 10)
			nfsdstats.th_fullcnt++;
	}
	spin_unlock(&nfsd_call_lock);
}

/*
 * This is the NFS server kernel thread
 */
static void
nfsd(struct svc_rqst *rqstp)
{
	struct svc_serv	*serv = rqstp->rq_server;
	struct fs_struct *fsp;
	int		err;
	struct nfsd_list me;
	sigset_t shutdown_mask, allowed_mask;

	/* Lock module and set up kernel thread */
	lock_kernel();
	daemonize("nfsd");

	/* After daemonize() this kernel thread shares current->fs
	 * with the init process. We need to create files with a
	 * umask of 0 instead of init's umask. */
	fsp = copy_fs_struct(current->fs);
	if (!fsp) {
		printk("Unable to start nfsd thread: out of memory\n");
		goto out;
	}
	exit_fs(current);
	current->fs = fsp;
	current->fs->umask = 0;

	siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS);
	siginitsetinv(&allowed_mask, ALLOWED_SIGS);

	nfsdstats.th_cnt++;

	lockd_up();				/* start lockd */

	me.task = current;
	list_add(&me.list, &nfsd_list);

	unlock_kernel();

	/*
	 * We want less throttling in balance_dirty_pages() so that nfs to
	 * localhost doesn't cause nfsd to lock up due to all the client's
	 * dirty pages.
	 */
	current->flags |= PF_LESS_THROTTLE;

	/*
	 * The main request loop
	 */
	for (;;) {
		/* Block all but the shutdown signals */
		sigprocmask(SIG_SETMASK, &shutdown_mask, NULL);

		/*
		 * Find a socket with data available and call its
		 * recvfrom routine.
		 */
		while ((err = svc_recv(serv, rqstp,
				       60*60*HZ)) == -EAGAIN)
			;
		if (err < 0)
			break;
		update_thread_usage(atomic_read(&nfsd_busy));
		atomic_inc(&nfsd_busy);

		/* Lock the export hash tables for reading. */
		exp_readlock();

		/* Process request with signals blocked.  */
		sigprocmask(SIG_SETMASK, &allowed_mask, NULL);

		svc_process(serv, rqstp);

		/* Unlock export hash tables */
		exp_readunlock();
		update_thread_usage(atomic_read(&nfsd_busy));
		atomic_dec(&nfsd_busy);
	}

	if (err != -EINTR) {
		printk(KERN_WARNING "nfsd: terminating on error %d\n", -err);
	} else {
		unsigned int	signo;

		for (signo = 1; signo <= _NSIG; signo++)
			if (sigismember(&current->pending.signal, signo) &&
			    !sigismember(&current->blocked, signo))
				break;
		err = signo;
	}
	/* Clear signals before calling lockd_down() and svc_exit_thread() */
	flush_signals(current);

	lock_kernel();

	/* Release lockd */
	lockd_down();

	/* Check if this is last thread */
	if (serv->sv_nrthreads==1) {
		
		printk(KERN_WARNING "nfsd: last server has exited\n");
		if (err != SIG_NOCLEAN) {
			printk(KERN_WARNING "nfsd: unexporting all filesystems\n");
			nfsd_export_flush();
		}
		nfsd_serv = NULL;
	        nfsd_racache_shutdown();	/* release read-ahead cache */
		nfs4_state_shutdown();
	}
	list_del(&me.list);
	nfsdstats.th_cnt --;

out:
	/* Release the thread */
	svc_exit_thread(rqstp);

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

int
nfsd_dispatch(struct svc_rqst *rqstp, u32 *statp)
{
	struct svc_procedure	*proc;
	kxdrproc_t		xdr;
	u32			nfserr;
	u32			*nfserrp;

	dprintk("nfsd_dispatch: vers %d proc %d\n",
				rqstp->rq_vers, rqstp->rq_proc);
	proc = rqstp->rq_procinfo;

	/* Check whether we have this call in the cache. */
	switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
	case RC_INTR:
	case RC_DROPIT:
		return 0;
	case RC_REPLY:
		return 1;
	case RC_DOIT:;
		/* do it */
	}

	/* Decode arguments */
	xdr = proc->pc_decode;
	if (xdr && !xdr(rqstp, (u32*)rqstp->rq_arg.head[0].iov_base,
			rqstp->rq_argp)) {
		dprintk("nfsd: failed to decode arguments!\n");
		nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
		*statp = rpc_garbage_args;
		return 1;
	}

	/* need to grab the location to store the status, as
	 * nfsv4 does some encoding while processing 
	 */
	nfserrp = rqstp->rq_res.head[0].iov_base
		+ rqstp->rq_res.head[0].iov_len;
	rqstp->rq_res.head[0].iov_len += sizeof(u32);

	/* Now call the procedure handler, and encode NFS status. */
	nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
	if (nfserr == nfserr_jukebox && rqstp->rq_vers == 2)
		nfserr = nfserr_dropit;
	if (nfserr == nfserr_dropit) {
		dprintk("nfsd: Dropping request due to malloc failure!\n");
		nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
		return 0;
	}

	if (rqstp->rq_proc != 0)
		*nfserrp++ = nfserr;

	/* Encode result.
	 * For NFSv2, additional info is never returned in case of an error.
	 */
	if (!(nfserr && rqstp->rq_vers == 2)) {
		xdr = proc->pc_encode;
		if (xdr && !xdr(rqstp, nfserrp,
				rqstp->rq_resp)) {
			/* Failed to encode result. Release cache entry */
			dprintk("nfsd: failed to encode result!\n");
			nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
			*statp = rpc_system_err;
			return 1;
		}
	}

	/* Store reply in cache. */
	nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);
	return 1;
}

#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
static struct svc_stat	nfsd_acl_svcstats;
static struct svc_version *	nfsd_acl_version[] = {
	[2] = &nfsd_acl_version2,
	[3] = &nfsd_acl_version3,
};

#define NFSD_ACL_NRVERS		(sizeof(nfsd_acl_version)/sizeof(nfsd_acl_version[0]))
static struct svc_program	nfsd_acl_program = {
	.pg_prog		= NFS_ACL_PROGRAM,
	.pg_nvers		= NFSD_ACL_NRVERS,
	.pg_vers		= nfsd_acl_version,
	.pg_name		= "nfsd",
	.pg_class		= "nfsd",
	.pg_stats		= &nfsd_acl_svcstats,
	.pg_authenticate	= &svc_set_client,
};

static struct svc_stat	nfsd_acl_svcstats = {
	.program	= &nfsd_acl_program,
};

#define nfsd_acl_program_p	&nfsd_acl_program
#else
#define nfsd_acl_program_p	NULL
#endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/nfsd/nfssvc.c
	3	*
	4	* Central processing for nfsd.
	5	*
	6	* Authors: Olaf Kirch (okir@monad.swb.de)
	7	*
	8	* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
	9	*/
	10
	11	#include <linux/config.h>
	12	#include <linux/module.h>
	13
	14	#include <linux/time.h>
	15	#include <linux/errno.h>
	16	#include <linux/nfs.h>
	17	#include <linux/in.h>
	18	#include <linux/uio.h>
	19	#include <linux/unistd.h>
	20	#include <linux/slab.h>
	21	#include <linux/smp.h>
	22	#include <linux/smp_lock.h>
	23	#include <linux/fs_struct.h>
	24
	25	#include <linux/sunrpc/types.h>
	26	#include <linux/sunrpc/stats.h>
	27	#include <linux/sunrpc/svc.h>
	28	#include <linux/sunrpc/svcsock.h>
	29	#include <linux/sunrpc/cache.h>
	30	#include <linux/nfsd/nfsd.h>
	31	#include <linux/nfsd/stats.h>
	32	#include <linux/nfsd/cache.h>
70c3b76c	33	#include <linux/nfsd/syscall.h>
1da177e4	34	#include <linux/lockd/bind.h>
a257cdd0	35	#include <linux/nfsacl.h>
1da177e4 LT	36
	37	#define NFSDDBG_FACILITY NFSDDBG_SVC
	38
	39	/* these signals will be delivered to an nfsd thread
	40	* when handling a request
	41	*/
	42	#define ALLOWED_SIGS (sigmask(SIGKILL))
	43	/* these signals will be delivered to an nfsd thread
	44	* when not handling a request. i.e. when waiting
	45	*/
	46	#define SHUTDOWN_SIGS (sigmask(SIGKILL) \| sigmask(SIGHUP) \| sigmask(SIGINT) \| sigmask(SIGQUIT))
	47	/* if the last thread dies with SIGHUP, then the exports table is
	48	* left unchanged ( like 2.4-{0-9} ). Any other signal will clear
	49	* the exports table (like 2.2).
	50	*/
	51	#define SIG_NOCLEAN SIGHUP
	52
	53	extern struct svc_program nfsd_program;
	54	static void nfsd(struct svc_rqst *rqstp);
	55	struct timeval nfssvc_boot;
70c3b76c	56	struct svc_serv *nfsd_serv;
1da177e4 LT	57	static atomic_t nfsd_busy;
	58	static unsigned long nfsd_last_call;
	59	static DEFINE_SPINLOCK(nfsd_call_lock);
	60
	61	struct nfsd_list {
	62	struct list_head list;
	63	struct task_struct *task;
	64	};
	65	static struct list_head nfsd_list = LIST_HEAD_INIT(nfsd_list);
	66
70c3b76c N	67	static struct svc_version * nfsd_version[] = {
	68	[2] = &nfsd_version2,
	69	#if defined(CONFIG_NFSD_V3)
	70	[3] = &nfsd_version3,
	71	#endif
	72	#if defined(CONFIG_NFSD_V4)
	73	[4] = &nfsd_version4,
	74	#endif
	75	};
	76
	77	#define NFSD_MINVERS 2
	78	#define NFSD_NRVERS (sizeof(nfsd_version)/sizeof(nfsd_version[0]))
	79	static struct svc_version *nfsd_versions[NFSD_NRVERS];
	80
	81	struct svc_program nfsd_program = {
	82	.pg_prog = NFS_PROGRAM, /* program number */
	83	.pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */
	84	.pg_vers = nfsd_versions, /* version table */
	85	.pg_name = "nfsd", /* program name */
	86	.pg_class = "nfsd", /* authentication class */
	87	.pg_stats = &nfsd_svcstats, /* version table */
	88	.pg_authenticate = &svc_set_client, /* export authentication */
	89
	90	};
	91
1da177e4 LT	92	/*
	93	* Maximum number of nfsd processes
	94	*/
	95	#define NFSD_MAXSERVS 8192
	96
	97	int nfsd_nrthreads(void)
	98	{
	99	if (nfsd_serv == NULL)
	100	return 0;
	101	else
	102	return nfsd_serv->sv_nrthreads;
	103	}
	104
	105	int
	106	nfsd_svc(unsigned short port, int nrservs)
	107	{
	108	int error;
70c3b76c	109	int none_left, found_one, i;
1da177e4 LT	110	struct list_head *victim;
	111
	112	lock_kernel();
70c3b76c N	113	dprintk("nfsd: creating service: vers 0x%x\n",
70c3b76c N	114	nfsd_versbits);
1da177e4 LT	115	error = -EINVAL;
	116	if (nrservs <= 0)
	117	nrservs = 0;
	118	if (nrservs > NFSD_MAXSERVS)
	119	nrservs = NFSD_MAXSERVS;
	120
	121	/* Readahead param cache - will no-op if it already exists */
	122	error = nfsd_racache_init(2*nrservs);
	123	if (error<0)
	124	goto out;
76a3550e	125	error = nfs4_state_start();
1da177e4 LT	126	if (error<0)
	127	goto out;
	128	if (!nfsd_serv) {
70c3b76c N	129	/*
	130	* Use the nfsd_ctlbits to define which
	131	* versions that will be advertised.
	132	* If nfsd_ctlbits doesn't list any version,
	133	* export them all.
	134	*/
	135	found_one = 0;
	136
	137	for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {
	138	if (NFSCTL_VERISSET(nfsd_versbits, i)) {
	139	nfsd_program.pg_vers[i] = nfsd_version[i];
	140	found_one = 1;
	141	} else
	142	nfsd_program.pg_vers[i] = NULL;
	143	}
	144
	145	if (!found_one) {
	146	for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)
	147	nfsd_program.pg_vers[i] = nfsd_version[i];
	148	}
	149
1da177e4 LT	150	atomic_set(&nfsd_busy, 0);
	151	error = -ENOMEM;
	152	nfsd_serv = svc_create(&nfsd_program, NFSD_BUFSIZE);
	153	if (nfsd_serv == NULL)
	154	goto out;
	155	error = svc_makesock(nfsd_serv, IPPROTO_UDP, port);
	156	if (error < 0)
	157	goto failure;
	158
	159	#ifdef CONFIG_NFSD_TCP
	160	error = svc_makesock(nfsd_serv, IPPROTO_TCP, port);
	161	if (error < 0)
	162	goto failure;
	163	#endif
	164	do_gettimeofday(&nfssvc_boot); /* record boot time */
	165	} else
	166	nfsd_serv->sv_nrthreads++;
	167	nrservs -= (nfsd_serv->sv_nrthreads-1);
	168	while (nrservs > 0) {
	169	nrservs--;
	170	__module_get(THIS_MODULE);
	171	error = svc_create_thread(nfsd, nfsd_serv);
	172	if (error < 0) {
	173	module_put(THIS_MODULE);
	174	break;
	175	}
	176	}
	177	victim = nfsd_list.next;
	178	while (nrservs < 0 && victim != &nfsd_list) {
	179	struct nfsd_list *nl =
	180	list_entry(victim,struct nfsd_list, list);
	181	victim = victim->next;
	182	send_sig(SIG_NOCLEAN, nl->task, 1);
	183	nrservs++;
	184	}
	185	failure:
	186	none_left = (nfsd_serv->sv_nrthreads == 1);
	187	svc_destroy(nfsd_serv); /* Release server */
	188	if (none_left) {
	189	nfsd_serv = NULL;
	190	nfsd_racache_shutdown();
	191	nfs4_state_shutdown();
	192	}
	193	out:
	194	unlock_kernel();
	195	return error;
	196	}
	197
	198	static inline void
	199	update_thread_usage(int busy_threads)
	200	{
	201	unsigned long prev_call;
	202	unsigned long diff;
	203	int decile;
	204
	205	spin_lock(&nfsd_call_lock);
	206	prev_call = nfsd_last_call;
	207	nfsd_last_call = jiffies;
	208	decile = busy_threads*10/nfsdstats.th_cnt;
	209	if (decile>0 && decile <= 10) {
	210	diff = nfsd_last_call - prev_call;
	211	if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP)
	212	nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP;
	213	if (decile == 10)
214	nfsdstats.th_fullcnt++;
215	}
216	spin_unlock(&nfsd_call_lock);
217	}
218
219	/*
220	* This is the NFS server kernel thread
221	*/
222	static void
223	nfsd(struct svc_rqst *rqstp)
224	{
225	struct svc_serv *serv = rqstp->rq_server;
226	struct fs_struct *fsp;
227	int err;
228	struct nfsd_list me;
229	sigset_t shutdown_mask, allowed_mask;
230
231	/* Lock module and set up kernel thread */
232	lock_kernel();
233	daemonize("nfsd");
234
235	/* After daemonize() this kernel thread shares current->fs
236	* with the init process. We need to create files with a
237	* umask of 0 instead of init's umask. */
238	fsp = copy_fs_struct(current->fs);
239	if (!fsp) {
240	printk("Unable to start nfsd thread: out of memory\n");
241	goto out;
242	}
243	exit_fs(current);
244	current->fs = fsp;
245	current->fs->umask = 0;
246
247	siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS);
248	siginitsetinv(&allowed_mask, ALLOWED_SIGS);
249
250	nfsdstats.th_cnt++;
251
252	lockd_up(); /* start lockd */
253
254	me.task = current;
255	list_add(&me.list, &nfsd_list);
256
257	unlock_kernel();
258
259	/*
260	* We want less throttling in balance_dirty_pages() so that nfs to
261	* localhost doesn't cause nfsd to lock up due to all the client's
262	* dirty pages.
263	*/
264	current->flags \|= PF_LESS_THROTTLE;
265
266	/*
267	* The main request loop
268	*/
269	for (;;) {
270	/* Block all but the shutdown signals */
271	sigprocmask(SIG_SETMASK, &shutdown_mask, NULL);
272
273	/*
274	* Find a socket with data available and call its
275	* recvfrom routine.
276	*/
277	while ((err = svc_recv(serv, rqstp,
278	6060HZ)) == -EAGAIN)
279	;
280	if (err < 0)
281	break;
282	update_thread_usage(atomic_read(&nfsd_busy));
283	atomic_inc(&nfsd_busy);
284
285	/* Lock the export hash tables for reading. */
286	exp_readlock();
287
288	/* Process request with signals blocked. */
289	sigprocmask(SIG_SETMASK, &allowed_mask, NULL);
290
291	svc_process(serv, rqstp);
292
293	/* Unlock export hash tables */
294	exp_readunlock();
295	update_thread_usage(atomic_read(&nfsd_busy));
296	atomic_dec(&nfsd_busy);
297	}
298
299	if (err != -EINTR) {
300	printk(KERN_WARNING "nfsd: terminating on error %d\n", -err);
301	} else {
302	unsigned int signo;
303
304	for (signo = 1; signo <= _NSIG; signo++)
305	if (sigismember(&current->pending.signal, signo) &&
306	!sigismember(&current->blocked, signo))
307	break;
308	err = signo;
309	}
9e416052 N	310	/* Clear signals before calling lockd_down() and svc_exit_thread() */
9e416052 N	311	flush_signals(current);
1da177e4 LT	312
	313	lock_kernel();
	314
	315	/* Release lockd */
	316	lockd_down();
	317
	318	/* Check if this is last thread */
	319	if (serv->sv_nrthreads==1) {
	320
	321	printk(KERN_WARNING "nfsd: last server has exited\n");
	322	if (err != SIG_NOCLEAN) {
	323	printk(KERN_WARNING "nfsd: unexporting all filesystems\n");
	324	nfsd_export_flush();
	325	}
	326	nfsd_serv = NULL;
	327	nfsd_racache_shutdown(); /* release read-ahead cache */
	328	nfs4_state_shutdown();
	329	}
	330	list_del(&me.list);
	331	nfsdstats.th_cnt --;
	332
	333	out:
	334	/* Release the thread */
	335	svc_exit_thread(rqstp);
	336
	337	/* Release module */
c4f92dba	338	unlock_kernel();
1da177e4 LT	339	module_put_and_exit(0);
	340	}
	341
	342	int
	343	nfsd_dispatch(struct svc_rqst rqstp, u32 statp)
	344	{
	345	struct svc_procedure *proc;
	346	kxdrproc_t xdr;
	347	u32 nfserr;
	348	u32 *nfserrp;
	349
	350	dprintk("nfsd_dispatch: vers %d proc %d\n",
	351	rqstp->rq_vers, rqstp->rq_proc);
	352	proc = rqstp->rq_procinfo;
	353
	354	/* Check whether we have this call in the cache. */
	355	switch (nfsd_cache_lookup(rqstp, proc->pc_cachetype)) {
	356	case RC_INTR:
	357	case RC_DROPIT:
	358	return 0;
	359	case RC_REPLY:
	360	return 1;
	361	case RC_DOIT:;
	362	/* do it */
	363	}
	364
	365	/* Decode arguments */
	366	xdr = proc->pc_decode;
	367	if (xdr && !xdr(rqstp, (u32*)rqstp->rq_arg.head[0].iov_base,
	368	rqstp->rq_argp)) {
	369	dprintk("nfsd: failed to decode arguments!\n");
	370	nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
	371	*statp = rpc_garbage_args;
	372	return 1;
	373	}
	374
	375	/* need to grab the location to store the status, as
	376	* nfsv4 does some encoding while processing
	377	*/
	378	nfserrp = rqstp->rq_res.head[0].iov_base
	379	+ rqstp->rq_res.head[0].iov_len;
	380	rqstp->rq_res.head[0].iov_len += sizeof(u32);
	381
	382	/* Now call the procedure handler, and encode NFS status. */
	383	nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp);
	384	if (nfserr == nfserr_jukebox && rqstp->rq_vers == 2)
	385	nfserr = nfserr_dropit;
	386	if (nfserr == nfserr_dropit) {
	387	dprintk("nfsd: Dropping request due to malloc failure!\n");
	388	nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
	389	return 0;
	390	}
	391
	392	if (rqstp->rq_proc != 0)
	393	*nfserrp++ = nfserr;
	394
	395	/* Encode result.
	396	* For NFSv2, additional info is never returned in case of an error.
	397	*/
	398	if (!(nfserr && rqstp->rq_vers == 2)) {
	399	xdr = proc->pc_encode;
	400	if (xdr && !xdr(rqstp, nfserrp,
	401	rqstp->rq_resp)) {
	402	/* Failed to encode result. Release cache entry */
403	dprintk("nfsd: failed to encode result!\n");
404	nfsd_cache_update(rqstp, RC_NOCACHE, NULL);
405	*statp = rpc_system_err;
406	return 1;
407	}
408	}
409
410	/* Store reply in cache. */
411	nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1);
412	return 1;
413	}
414
a257cdd0 AG	415	#if defined(CONFIG_NFSD_V2_ACL) \|\| defined(CONFIG_NFSD_V3_ACL)
	416	static struct svc_stat nfsd_acl_svcstats;
	417	static struct svc_version * nfsd_acl_version[] = {
	418	[2] = &nfsd_acl_version2,
	419	[3] = &nfsd_acl_version3,
	420	};
	421
	422	#define NFSD_ACL_NRVERS (sizeof(nfsd_acl_version)/sizeof(nfsd_acl_version[0]))
	423	static struct svc_program nfsd_acl_program = {
	424	.pg_prog = NFS_ACL_PROGRAM,
	425	.pg_nvers = NFSD_ACL_NRVERS,
	426	.pg_vers = nfsd_acl_version,
	427	.pg_name = "nfsd",
21348425	428	.pg_class = "nfsd",
a257cdd0	429	.pg_stats = &nfsd_acl_svcstats,
80d188a6	430	.pg_authenticate = &svc_set_client,
a257cdd0 AG	431	};
	432
	433	static struct svc_stat nfsd_acl_svcstats = {
	434	.program = &nfsd_acl_program,
	435	};
	436
	437	#define nfsd_acl_program_p &nfsd_acl_program
	438	#else
	439	#define nfsd_acl_program_p NULL
	440	#endif /* defined(CONFIG_NFSD_V2_ACL) \|\| defined(CONFIG_NFSD_V3_ACL) */