fs/nfsd/nfssvc.c - kernel/msm-4.9 - Gitiles

 /*
  * 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) */
	/*
	* 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,
	6060HZ)) == -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) */