fs/nfsd/nfsctl.c - android_kernel_oneplus_msm8996 - Gitiles

 /*
  * linux/fs/nfsd/nfsctl.c
  *
  * Syscall interface to knfsd.
  *
  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  */

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

 #include <linux/linkage.h>
 #include <linux/time.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/fcntl.h>
 #include <linux/net.h>
 #include <linux/in.h>
 #include <linux/syscalls.h>
 #include <linux/unistd.h>
 #include <linux/slab.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/pagemap.h>
 #include <linux/init.h>

 #include <linux/nfs.h>
 #include <linux/nfsd_idmap.h>
 #include <linux/sunrpc/svc.h>
 #include <linux/nfsd/nfsd.h>
 #include <linux/nfsd/cache.h>
 #include <linux/nfsd/xdr.h>
 #include <linux/nfsd/syscall.h>
 #include <linux/nfsd/interface.h>

 #include <asm/uaccess.h>

 /*
  *	We have a single directory with 9 nodes in it.
  */
 enum {
 	NFSD_Root = 1,
 	NFSD_Svc,
 	NFSD_Add,
 	NFSD_Del,
 	NFSD_Export,
 	NFSD_Unexport,
 	NFSD_Getfd,
 	NFSD_Getfs,
 	NFSD_List,
 	NFSD_Fh,
 	NFSD_Threads,
 	NFSD_Leasetime,
 	NFSD_RecoveryDir,
 };

 /*
  * write() for these nodes.
  */
 static ssize_t write_svc(struct file *file, char *buf, size_t size);
 static ssize_t write_add(struct file *file, char *buf, size_t size);
 static ssize_t write_del(struct file *file, char *buf, size_t size);
 static ssize_t write_export(struct file *file, char *buf, size_t size);
 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
 static ssize_t write_threads(struct file *file, char *buf, size_t size);
 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);

 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 	[NFSD_Svc] = write_svc,
 	[NFSD_Add] = write_add,
 	[NFSD_Del] = write_del,
 	[NFSD_Export] = write_export,
 	[NFSD_Unexport] = write_unexport,
 	[NFSD_Getfd] = write_getfd,
 	[NFSD_Getfs] = write_getfs,
 	[NFSD_Fh] = write_filehandle,
 	[NFSD_Threads] = write_threads,
 	[NFSD_Leasetime] = write_leasetime,
 	[NFSD_RecoveryDir] = write_recoverydir,
 };

 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 {
 	ino_t ino =  file->f_dentry->d_inode->i_ino;
 	char *data;
 	ssize_t rv;

 	if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino])
 		return -EINVAL;

 	data = simple_transaction_get(file, buf, size);
 	if (IS_ERR(data))
 		return PTR_ERR(data);

 	rv =  write_op[ino](file, data, size);
 	if (rv>0) {
 		simple_transaction_set(file, rv);
 		rv = size;
 	}
 	return rv;
 }

 static struct file_operations transaction_ops = {
 	.write		= nfsctl_transaction_write,
 	.read		= simple_transaction_read,
 	.release	= simple_transaction_release,
 };

 extern struct seq_operations nfs_exports_op;
 static int exports_open(struct inode *inode, struct file *file)
 {
 	return seq_open(file, &nfs_exports_op);
 }

 static struct file_operations exports_operations = {
 	.open		= exports_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };

 /*----------------------------------------------------------------------------*/
 /*
  * payload - write methods
  * If the method has a response, the response should be put in buf,
  * and the length returned.  Otherwise return 0 or and -error.
  */

 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 {
 	struct nfsctl_svc *data;
 	if (size < sizeof(*data))
 		return -EINVAL;
 	data = (struct nfsctl_svc*) buf;
 	return nfsd_svc(data->svc_port, data->svc_nthreads);
 }

 static ssize_t write_add(struct file *file, char *buf, size_t size)
 {
 	struct nfsctl_client *data;
 	if (size < sizeof(*data))
 		return -EINVAL;
 	data = (struct nfsctl_client *)buf;
 	return exp_addclient(data);
 }

 static ssize_t write_del(struct file *file, char *buf, size_t size)
 {
 	struct nfsctl_client *data;
 	if (size < sizeof(*data))
 		return -EINVAL;
 	data = (struct nfsctl_client *)buf;
 	return exp_delclient(data);
 }

 static ssize_t write_export(struct file *file, char *buf, size_t size)
 {
 	struct nfsctl_export *data;
 	if (size < sizeof(*data))
 		return -EINVAL;
 	data = (struct nfsctl_export*)buf;
 	return exp_export(data);
 }

 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 {
 	struct nfsctl_export *data;

 	if (size < sizeof(*data))
 		return -EINVAL;
 	data = (struct nfsctl_export*)buf;
 	return exp_unexport(data);
 }

 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 {
 	struct nfsctl_fsparm *data;
 	struct sockaddr_in *sin;
 	struct auth_domain *clp;
 	int err = 0;
 	struct knfsd_fh *res;

 	if (size < sizeof(*data))
 		return -EINVAL;
 	data = (struct nfsctl_fsparm*)buf;
 	err = -EPROTONOSUPPORT;
 	if (data->gd_addr.sa_family != AF_INET)
 		goto out;
 	sin = (struct sockaddr_in *)&data->gd_addr;
 	if (data->gd_maxlen > NFS3_FHSIZE)
 		data->gd_maxlen = NFS3_FHSIZE;

 	res = (struct knfsd_fh*)buf;

 	exp_readlock();
 	if (!(clp = auth_unix_lookup(sin->sin_addr)))
 		err = -EPERM;
 	else {
 		err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 		auth_domain_put(clp);
 	}
 	exp_readunlock();
 	if (err == 0)
 		err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
  out:
 	return err;
 }

 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 {
 	struct nfsctl_fdparm *data;
 	struct sockaddr_in *sin;
 	struct auth_domain *clp;
 	int err = 0;
 	struct knfsd_fh fh;
 	char *res;

 	if (size < sizeof(*data))
 		return -EINVAL;
 	data = (struct nfsctl_fdparm*)buf;
 	err = -EPROTONOSUPPORT;
 	if (data->gd_addr.sa_family != AF_INET)
 		goto out;
 	err = -EINVAL;
 	if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 		goto out;

 	res = buf;
 	sin = (struct sockaddr_in *)&data->gd_addr;
 	exp_readlock();
 	if (!(clp = auth_unix_lookup(sin->sin_addr)))
 		err = -EPERM;
 	else {
 		err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 		auth_domain_put(clp);
 	}
 	exp_readunlock();

 	if (err == 0) {
 		memset(res,0, NFS_FHSIZE);
 		memcpy(res, &fh.fh_base, fh.fh_size);
 		err = NFS_FHSIZE;
 	}
  out:
 	return err;
 }

 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 {
 	/* request is:
 	 *   domain path maxsize
 	 * response is
 	 *   filehandle
 	 *
 	 * qword quoting is used, so filehandle will be \x....
 	 */
 	char *dname, *path;
 	int maxsize;
 	char *mesg = buf;
 	int len;
 	struct auth_domain *dom;
 	struct knfsd_fh fh;

 	if (buf[size-1] != '\n')
 		return -EINVAL;
 	buf[size-1] = 0;

 	dname = mesg;
 	len = qword_get(&mesg, dname, size);
 	if (len <= 0) return -EINVAL;

 	path = dname+len+1;
 	len = qword_get(&mesg, path, size);
 	if (len <= 0) return -EINVAL;

 	len = get_int(&mesg, &maxsize);
 	if (len)
 		return len;

 	if (maxsize < NFS_FHSIZE)
 		return -EINVAL;
 	if (maxsize > NFS3_FHSIZE)
 		maxsize = NFS3_FHSIZE;

 	if (qword_get(&mesg, mesg, size)>0)
 		return -EINVAL;

 	/* we have all the words, they are in buf.. */
 	dom = unix_domain_find(dname);
 	if (!dom)
 		return -ENOMEM;

 	len = exp_rootfh(dom, path, &fh,  maxsize);
 	auth_domain_put(dom);
 	if (len)
 		return len;

 	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 	mesg[-1] = '\n';
 	return mesg - buf;
 }

 extern int nfsd_nrthreads(void);

 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 {
 	/* if size > 0, look for a number of threads and call nfsd_svc
 	 * then write out number of threads as reply
 	 */
 	char *mesg = buf;
 	int rv;
 	if (size > 0) {
 		int newthreads;
 		rv = get_int(&mesg, &newthreads);
 		if (rv)
 			return rv;
 		if (newthreads <0)
 			return -EINVAL;
 		rv = nfsd_svc(2049, newthreads);
 		if (rv)
 			return rv;
 	}
 	sprintf(buf, "%d\n", nfsd_nrthreads());
 	return strlen(buf);
 }

 extern time_t nfs4_leasetime(void);

 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 {
 	/* if size > 10 seconds, call
 	 * nfs4_reset_lease() then write out the new lease (seconds) as reply
 	 */
 	char *mesg = buf;
 	int rv;

 	if (size > 0) {
 		int lease;
 		rv = get_int(&mesg, &lease);
 		if (rv)
 			return rv;
 		if (lease < 10 || lease > 3600)
 			return -EINVAL;
 		nfs4_reset_lease(lease);
 	}
 	sprintf(buf, "%ld\n", nfs4_lease_time());
 	return strlen(buf);
 }

 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 {
 	char *mesg = buf;
 	char *recdir;
 	int len, status;

 	if (size > PATH_MAX || buf[size-1] != '\n')
 		return -EINVAL;
 	buf[size-1] = 0;

 	recdir = mesg;
 	len = qword_get(&mesg, recdir, size);
 	if (len <= 0)
 		return -EINVAL;

 	status = nfs4_reset_recoverydir(recdir);
 	return strlen(buf);
 }

 /*----------------------------------------------------------------------------*/
 /*
  *	populating the filesystem.
  */

 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 {
 	static struct tree_descr nfsd_files[] = {
 		[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 		[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 		[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 		[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 		[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 		[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 		[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 #ifdef CONFIG_NFSD_V4
 		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 #endif
 		/* last one */ {""}
 	};
 	return simple_fill_super(sb, 0x6e667364, nfsd_files);
 }

 static struct super_block *nfsd_get_sb(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data)
 {
 	return get_sb_single(fs_type, flags, data, nfsd_fill_super);
 }

 static struct file_system_type nfsd_fs_type = {
 	.owner		= THIS_MODULE,
 	.name		= "nfsd",
 	.get_sb		= nfsd_get_sb,
 	.kill_sb	= kill_litter_super,
 };

 static int __init init_nfsd(void)
 {
 	int retval;
 	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");

 	nfsd_stat_init();	/* Statistics */
 	nfsd_cache_init();	/* RPC reply cache */
 	nfsd_export_init();	/* Exports table */
 	nfsd_lockd_init();	/* lockd->nfsd callbacks */
 	nfs4_state_init();	/* NFSv4 locking state */
 	nfsd_idmap_init();      /* Name to ID mapping */
 	if (proc_mkdir("fs/nfs", NULL)) {
 		struct proc_dir_entry *entry;
 		entry = create_proc_entry("fs/nfs/exports", 0, NULL);
 		if (entry)
 			entry->proc_fops =  &exports_operations;
 	}
 	retval = register_filesystem(&nfsd_fs_type);
 	if (retval) {
 		nfsd_export_shutdown();
 		nfsd_cache_shutdown();
 		remove_proc_entry("fs/nfs/exports", NULL);
 		remove_proc_entry("fs/nfs", NULL);
 		nfsd_stat_shutdown();
 		nfsd_lockd_shutdown();
 	}
 	return retval;
 }

 static void __exit exit_nfsd(void)
 {
 	nfsd_export_shutdown();
 	nfsd_cache_shutdown();
 	remove_proc_entry("fs/nfs/exports", NULL);
 	remove_proc_entry("fs/nfs", NULL);
 	nfsd_stat_shutdown();
 	nfsd_lockd_shutdown();
 	nfsd_idmap_shutdown();
 	unregister_filesystem(&nfsd_fs_type);
 }

 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 MODULE_LICENSE("GPL");
 module_init(init_nfsd)
 module_exit(exit_nfsd)
	/*
	* linux/fs/nfsd/nfsctl.c
	*
	* Syscall interface to knfsd.
	*
	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	*/

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

	#include <linux/linkage.h>
	#include <linux/time.h>
	#include <linux/errno.h>
	#include <linux/fs.h>
	#include <linux/fcntl.h>
	#include <linux/net.h>
	#include <linux/in.h>
	#include <linux/syscalls.h>
	#include <linux/unistd.h>
	#include <linux/slab.h>
	#include <linux/proc_fs.h>
	#include <linux/seq_file.h>
	#include <linux/pagemap.h>
	#include <linux/init.h>

	#include <linux/nfs.h>
	#include <linux/nfsd_idmap.h>
	#include <linux/sunrpc/svc.h>
	#include <linux/nfsd/nfsd.h>
	#include <linux/nfsd/cache.h>
	#include <linux/nfsd/xdr.h>
	#include <linux/nfsd/syscall.h>
	#include <linux/nfsd/interface.h>

	#include <asm/uaccess.h>

	/*
	* We have a single directory with 9 nodes in it.
	*/
	enum {
	NFSD_Root = 1,
	NFSD_Svc,
	NFSD_Add,
	NFSD_Del,
	NFSD_Export,
	NFSD_Unexport,
	NFSD_Getfd,
	NFSD_Getfs,
	NFSD_List,
	NFSD_Fh,
	NFSD_Threads,
	NFSD_Leasetime,
	NFSD_RecoveryDir,
	};

	/*
	* write() for these nodes.
	*/
	static ssize_t write_svc(struct file file, char buf, size_t size);
	static ssize_t write_add(struct file file, char buf, size_t size);
	static ssize_t write_del(struct file file, char buf, size_t size);
	static ssize_t write_export(struct file file, char buf, size_t size);
	static ssize_t write_unexport(struct file file, char buf, size_t size);
	static ssize_t write_getfd(struct file file, char buf, size_t size);
	static ssize_t write_getfs(struct file file, char buf, size_t size);
	static ssize_t write_filehandle(struct file file, char buf, size_t size);
	static ssize_t write_threads(struct file file, char buf, size_t size);
	static ssize_t write_leasetime(struct file file, char buf, size_t size);
	static ssize_t write_recoverydir(struct file file, char buf, size_t size);

	static ssize_t (write_op[])(struct file , char *, size_t) = {
	[NFSD_Svc] = write_svc,
	[NFSD_Add] = write_add,
	[NFSD_Del] = write_del,
	[NFSD_Export] = write_export,
	[NFSD_Unexport] = write_unexport,
	[NFSD_Getfd] = write_getfd,
	[NFSD_Getfs] = write_getfs,
	[NFSD_Fh] = write_filehandle,
	[NFSD_Threads] = write_threads,
	[NFSD_Leasetime] = write_leasetime,
	[NFSD_RecoveryDir] = write_recoverydir,
	};

	static ssize_t nfsctl_transaction_write(struct file file, const char __user buf, size_t size, loff_t *pos)
	{
	ino_t ino = file->f_dentry->d_inode->i_ino;
	char *data;
	ssize_t rv;

	if (ino >= sizeof(write_op)/sizeof(write_op[0]) \|\| !write_op[ino])
	return -EINVAL;

	data = simple_transaction_get(file, buf, size);
	if (IS_ERR(data))
	return PTR_ERR(data);

	rv = write_op[ino](file, data, size);
	if (rv>0) {
	simple_transaction_set(file, rv);
	rv = size;
	}
	return rv;
	}

	static struct file_operations transaction_ops = {
	.write = nfsctl_transaction_write,
	.read = simple_transaction_read,
	.release = simple_transaction_release,
	};

	extern struct seq_operations nfs_exports_op;
	static int exports_open(struct inode inode, struct file file)
	{
	return seq_open(file, &nfs_exports_op);
	}

	static struct file_operations exports_operations = {
	.open = exports_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
	};

	/----------------------------------------------------------------------------/
	/*
	* payload - write methods
	* If the method has a response, the response should be put in buf,
	* and the length returned. Otherwise return 0 or and -error.
	*/

	static ssize_t write_svc(struct file file, char buf, size_t size)
	{
	struct nfsctl_svc *data;
	if (size < sizeof(*data))
	return -EINVAL;
	data = (struct nfsctl_svc*) buf;
	return nfsd_svc(data->svc_port, data->svc_nthreads);
	}

	static ssize_t write_add(struct file file, char buf, size_t size)
	{
	struct nfsctl_client *data;
	if (size < sizeof(*data))
	return -EINVAL;
	data = (struct nfsctl_client *)buf;
	return exp_addclient(data);
	}

	static ssize_t write_del(struct file file, char buf, size_t size)
	{
	struct nfsctl_client *data;
	if (size < sizeof(*data))
	return -EINVAL;
	data = (struct nfsctl_client *)buf;
	return exp_delclient(data);
	}

	static ssize_t write_export(struct file file, char buf, size_t size)
	{
	struct nfsctl_export *data;
	if (size < sizeof(*data))
	return -EINVAL;
	data = (struct nfsctl_export*)buf;
	return exp_export(data);
	}

	static ssize_t write_unexport(struct file file, char buf, size_t size)
	{
	struct nfsctl_export *data;

	if (size < sizeof(*data))
	return -EINVAL;
	data = (struct nfsctl_export*)buf;
	return exp_unexport(data);
	}

	static ssize_t write_getfs(struct file file, char buf, size_t size)
	{
	struct nfsctl_fsparm *data;
	struct sockaddr_in *sin;
	struct auth_domain *clp;
	int err = 0;
	struct knfsd_fh *res;

	if (size < sizeof(*data))
	return -EINVAL;
	data = (struct nfsctl_fsparm*)buf;
	err = -EPROTONOSUPPORT;
	if (data->gd_addr.sa_family != AF_INET)
	goto out;
	sin = (struct sockaddr_in *)&data->gd_addr;
	if (data->gd_maxlen > NFS3_FHSIZE)
	data->gd_maxlen = NFS3_FHSIZE;

	res = (struct knfsd_fh*)buf;

	exp_readlock();
	if (!(clp = auth_unix_lookup(sin->sin_addr)))
	err = -EPERM;
	else {
	err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
	auth_domain_put(clp);
	}
	exp_readunlock();
	if (err == 0)
	err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
	out:
	return err;
	}

	static ssize_t write_getfd(struct file file, char buf, size_t size)
	{
	struct nfsctl_fdparm *data;
	struct sockaddr_in *sin;
	struct auth_domain *clp;
	int err = 0;
	struct knfsd_fh fh;
	char *res;

	if (size < sizeof(*data))
	return -EINVAL;
	data = (struct nfsctl_fdparm*)buf;
	err = -EPROTONOSUPPORT;
	if (data->gd_addr.sa_family != AF_INET)
	goto out;
	err = -EINVAL;
	if (data->gd_version < 2 \|\| data->gd_version > NFSSVC_MAXVERS)
	goto out;

	res = buf;
	sin = (struct sockaddr_in *)&data->gd_addr;
	exp_readlock();
	if (!(clp = auth_unix_lookup(sin->sin_addr)))
	err = -EPERM;
	else {
	err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
	auth_domain_put(clp);
	}
	exp_readunlock();

	if (err == 0) {
	memset(res,0, NFS_FHSIZE);
	memcpy(res, &fh.fh_base, fh.fh_size);
	err = NFS_FHSIZE;
	}
	out:
	return err;
	}

	static ssize_t write_filehandle(struct file file, char buf, size_t size)
	{
	/* request is:
	* domain path maxsize
	* response is
	* filehandle
	*
	* qword quoting is used, so filehandle will be \x....
	*/
	char dname, path;
	int maxsize;
	char *mesg = buf;
	int len;
	struct auth_domain *dom;
	struct knfsd_fh fh;

	if (buf[size-1] != '\n')
	return -EINVAL;
	buf[size-1] = 0;

	dname = mesg;
	len = qword_get(&mesg, dname, size);
	if (len <= 0) return -EINVAL;

	path = dname+len+1;
	len = qword_get(&mesg, path, size);
	if (len <= 0) return -EINVAL;

	len = get_int(&mesg, &maxsize);
	if (len)
	return len;

	if (maxsize < NFS_FHSIZE)
	return -EINVAL;
	if (maxsize > NFS3_FHSIZE)
	maxsize = NFS3_FHSIZE;

	if (qword_get(&mesg, mesg, size)>0)
	return -EINVAL;

	/* we have all the words, they are in buf.. */
	dom = unix_domain_find(dname);
	if (!dom)
	return -ENOMEM;

	len = exp_rootfh(dom, path, &fh, maxsize);
	auth_domain_put(dom);
	if (len)
	return len;

	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
	mesg[-1] = '\n';
	return mesg - buf;
	}

	extern int nfsd_nrthreads(void);

	static ssize_t write_threads(struct file file, char buf, size_t size)
	{
	/* if size > 0, look for a number of threads and call nfsd_svc
	* then write out number of threads as reply
	*/
	char *mesg = buf;
	int rv;
	if (size > 0) {
	int newthreads;
	rv = get_int(&mesg, &newthreads);
	if (rv)
	return rv;
	if (newthreads <0)
	return -EINVAL;
	rv = nfsd_svc(2049, newthreads);
	if (rv)
	return rv;
	}
	sprintf(buf, "%d\n", nfsd_nrthreads());
	return strlen(buf);
	}

	extern time_t nfs4_leasetime(void);

	static ssize_t write_leasetime(struct file file, char buf, size_t size)
	{
	/* if size > 10 seconds, call
	* nfs4_reset_lease() then write out the new lease (seconds) as reply
	*/
	char *mesg = buf;
	int rv;

	if (size > 0) {
	int lease;
	rv = get_int(&mesg, &lease);
	if (rv)
	return rv;
	if (lease < 10 \|\| lease > 3600)
	return -EINVAL;
	nfs4_reset_lease(lease);
	}
	sprintf(buf, "%ld\n", nfs4_lease_time());
	return strlen(buf);
	}

	static ssize_t write_recoverydir(struct file file, char buf, size_t size)
	{
	char *mesg = buf;
	char *recdir;
	int len, status;

	if (size > PATH_MAX \|\| buf[size-1] != '\n')
	return -EINVAL;
	buf[size-1] = 0;

	recdir = mesg;
	len = qword_get(&mesg, recdir, size);
	if (len <= 0)
	return -EINVAL;

	status = nfs4_reset_recoverydir(recdir);
	return strlen(buf);
	}

	/----------------------------------------------------------------------------/
	/*
	* populating the filesystem.
	*/

	static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
	{
	static struct tree_descr nfsd_files[] = {
	[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
	[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
	[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
	[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
	[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
	[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR\|S_IRUSR},
	[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR\|S_IRUSR},
	[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
	[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR\|S_IRUSR},
	[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR\|S_IRUSR},
	#ifdef CONFIG_NFSD_V4
	[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR\|S_IRUSR},
	[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR\|S_IRUSR},
	#endif
	/* last one */ {""}
	};
	return simple_fill_super(sb, 0x6e667364, nfsd_files);
	}

	static struct super_block nfsd_get_sb(struct file_system_type fs_type,
	int flags, const char dev_name, void data)
	{
	return get_sb_single(fs_type, flags, data, nfsd_fill_super);
	}

	static struct file_system_type nfsd_fs_type = {
	.owner = THIS_MODULE,
	.name = "nfsd",
	.get_sb = nfsd_get_sb,
	.kill_sb = kill_litter_super,
	};

	static int __init init_nfsd(void)
	{
	int retval;
	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");

	nfsd_stat_init(); /* Statistics */
	nfsd_cache_init(); /* RPC reply cache */
	nfsd_export_init(); /* Exports table */
	nfsd_lockd_init(); /* lockd->nfsd callbacks */
	nfs4_state_init(); /* NFSv4 locking state */
	nfsd_idmap_init(); /* Name to ID mapping */
	if (proc_mkdir("fs/nfs", NULL)) {
	struct proc_dir_entry *entry;
	entry = create_proc_entry("fs/nfs/exports", 0, NULL);
	if (entry)
	entry->proc_fops = &exports_operations;
	}
	retval = register_filesystem(&nfsd_fs_type);
	if (retval) {
	nfsd_export_shutdown();
	nfsd_cache_shutdown();
	remove_proc_entry("fs/nfs/exports", NULL);
	remove_proc_entry("fs/nfs", NULL);
	nfsd_stat_shutdown();
	nfsd_lockd_shutdown();
	}
	return retval;
	}

	static void __exit exit_nfsd(void)
	{
	nfsd_export_shutdown();
	nfsd_cache_shutdown();
	remove_proc_entry("fs/nfs/exports", NULL);
	remove_proc_entry("fs/nfs", NULL);
	nfsd_stat_shutdown();
	nfsd_lockd_shutdown();
	nfsd_idmap_shutdown();
	unregister_filesystem(&nfsd_fs_type);
	}

	MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
	MODULE_LICENSE("GPL");
	module_init(init_nfsd)
	module_exit(exit_nfsd)