[thirdparty/linux.git] / fs / nfsd / nfsctl.c

/*
 * 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,
};

/*
 * 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_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,
};

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);
}

/*----------------------------------------------------------------------------*/
/*
 *	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},
#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 */
#ifdef CONFIG_NFSD_V4
	nfsd_idmap_init();      /* Name to ID mapping */
#endif /* CONFIG_NFSD_V4 */
	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();
#ifdef CONFIG_NFSD_V4
	nfsd_idmap_shutdown();
#endif /* CONFIG_NFSD_V4 */
	unregister_filesystem(&nfsd_fs_type);
}

MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
MODULE_LICENSE("GPL");
module_init(init_nfsd)
module_exit(exit_nfsd)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/nfsd/nfsctl.c
	3	*
	4	* Syscall interface to knfsd.
	5	*
	6	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	7	*/
	8
	9	#include <linux/config.h>
	10	#include <linux/module.h>
	11
	12	#include <linux/linkage.h>
	13	#include <linux/time.h>
	14	#include <linux/errno.h>
	15	#include <linux/fs.h>
	16	#include <linux/fcntl.h>
	17	#include <linux/net.h>
	18	#include <linux/in.h>
	19	#include <linux/syscalls.h>
	20	#include <linux/unistd.h>
	21	#include <linux/slab.h>
	22	#include <linux/proc_fs.h>
	23	#include <linux/seq_file.h>
	24	#include <linux/pagemap.h>
	25	#include <linux/init.h>
	26
	27	#include <linux/nfs.h>
	28	#include <linux/nfsd_idmap.h>
	29	#include <linux/sunrpc/svc.h>
	30	#include <linux/nfsd/nfsd.h>
	31	#include <linux/nfsd/cache.h>
	32	#include <linux/nfsd/xdr.h>
	33	#include <linux/nfsd/syscall.h>
	34	#include <linux/nfsd/interface.h>
	35
	36	#include <asm/uaccess.h>
	37
	38	/*
	39	* We have a single directory with 9 nodes in it.
	40	*/
	41	enum {
	42	NFSD_Root = 1,
	43	NFSD_Svc,
	44	NFSD_Add,
	45	NFSD_Del,
	46	NFSD_Export,
	47	NFSD_Unexport,
	48	NFSD_Getfd,
	49	NFSD_Getfs,
	50	NFSD_List,
	51	NFSD_Fh,
	52	NFSD_Threads,
	53	NFSD_Leasetime,
	54	};
	55
	56	/*
	57	* write() for these nodes.
	58	*/
	59	static ssize_t write_svc(struct file file, char buf, size_t size);
	60	static ssize_t write_add(struct file file, char buf, size_t size);
	61	static ssize_t write_del(struct file file, char buf, size_t size);
	62	static ssize_t write_export(struct file file, char buf, size_t size);
	63	static ssize_t write_unexport(struct file file, char buf, size_t size);
	64	static ssize_t write_getfd(struct file file, char buf, size_t size);
65	static ssize_t write_getfs(struct file file, char buf, size_t size);
66	static ssize_t write_filehandle(struct file file, char buf, size_t size);
67	static ssize_t write_threads(struct file file, char buf, size_t size);
68	static ssize_t write_leasetime(struct file file, char buf, size_t size);
69
70	static ssize_t (write_op[])(struct file , char *, size_t) = {
71	[NFSD_Svc] = write_svc,
72	[NFSD_Add] = write_add,
73	[NFSD_Del] = write_del,
74	[NFSD_Export] = write_export,
75	[NFSD_Unexport] = write_unexport,
76	[NFSD_Getfd] = write_getfd,
77	[NFSD_Getfs] = write_getfs,
78	[NFSD_Fh] = write_filehandle,
79	[NFSD_Threads] = write_threads,
80	[NFSD_Leasetime] = write_leasetime,
81	};
82
83	static ssize_t nfsctl_transaction_write(struct file file, const char __user buf, size_t size, loff_t *pos)
84	{
85	ino_t ino = file->f_dentry->d_inode->i_ino;
86	char *data;
87	ssize_t rv;
88
89	if (ino >= sizeof(write_op)/sizeof(write_op[0]) \|\| !write_op[ino])
90	return -EINVAL;
91
92	data = simple_transaction_get(file, buf, size);
93	if (IS_ERR(data))
94	return PTR_ERR(data);
95
96	rv = write_op[ino](file, data, size);
97	if (rv>0) {
98	simple_transaction_set(file, rv);
99	rv = size;
100	}
101	return rv;
102	}
103
104	static struct file_operations transaction_ops = {
105	.write = nfsctl_transaction_write,
106	.read = simple_transaction_read,
107	.release = simple_transaction_release,
108	};
109
110	extern struct seq_operations nfs_exports_op;
111	static int exports_open(struct inode inode, struct file file)
112	{
113	return seq_open(file, &nfs_exports_op);
114	}
115
116	static struct file_operations exports_operations = {
117	.open = exports_open,
118	.read = seq_read,
119	.llseek = seq_lseek,
120	.release = seq_release,
121	};
122
123	/----------------------------------------------------------------------------/
124	/*
125	* payload - write methods
126	* If the method has a response, the response should be put in buf,
127	* and the length returned. Otherwise return 0 or and -error.
128	*/
129
130	static ssize_t write_svc(struct file file, char buf, size_t size)
131	{
132	struct nfsctl_svc *data;
133	if (size < sizeof(*data))
134	return -EINVAL;
135	data = (struct nfsctl_svc*) buf;
136	return nfsd_svc(data->svc_port, data->svc_nthreads);
137	}
138
139	static ssize_t write_add(struct file file, char buf, size_t size)
140	{
141	struct nfsctl_client *data;
142	if (size < sizeof(*data))
143	return -EINVAL;
144	data = (struct nfsctl_client *)buf;
145	return exp_addclient(data);
146	}
147
148	static ssize_t write_del(struct file file, char buf, size_t size)
149	{
150	struct nfsctl_client *data;
151	if (size < sizeof(*data))
152	return -EINVAL;
153	data = (struct nfsctl_client *)buf;
154	return exp_delclient(data);
155	}
156
157	static ssize_t write_export(struct file file, char buf, size_t size)
158	{
159	struct nfsctl_export *data;
160	if (size < sizeof(*data))
161	return -EINVAL;
162	data = (struct nfsctl_export*)buf;
163	return exp_export(data);
164	}
165
166	static ssize_t write_unexport(struct file file, char buf, size_t size)
167	{
168	struct nfsctl_export *data;
169
170	if (size < sizeof(*data))
171	return -EINVAL;
172	data = (struct nfsctl_export*)buf;
173	return exp_unexport(data);
174	}
175
176	static ssize_t write_getfs(struct file file, char buf, size_t size)
177	{
178	struct nfsctl_fsparm *data;
179	struct sockaddr_in *sin;
180	struct auth_domain *clp;
181	int err = 0;
182	struct knfsd_fh *res;
183
184	if (size < sizeof(*data))
185	return -EINVAL;
186	data = (struct nfsctl_fsparm*)buf;
187	err = -EPROTONOSUPPORT;
188	if (data->gd_addr.sa_family != AF_INET)
189	goto out;
190	sin = (struct sockaddr_in *)&data->gd_addr;
191	if (data->gd_maxlen > NFS3_FHSIZE)
192	data->gd_maxlen = NFS3_FHSIZE;
193
194	res = (struct knfsd_fh*)buf;
195
196	exp_readlock();
197	if (!(clp = auth_unix_lookup(sin->sin_addr)))
198	err = -EPERM;
199	else {
200	err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
201	auth_domain_put(clp);
202	}
203	exp_readunlock();
204	if (err == 0)
205	err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
206	out:
207	return err;
208	}
209
210	static ssize_t write_getfd(struct file file, char buf, size_t size)
211	{
212	struct nfsctl_fdparm *data;
213	struct sockaddr_in *sin;
214	struct auth_domain *clp;
215	int err = 0;
216	struct knfsd_fh fh;
217	char *res;
218
219	if (size < sizeof(*data))
220	return -EINVAL;
221	data = (struct nfsctl_fdparm*)buf;
222	err = -EPROTONOSUPPORT;
223	if (data->gd_addr.sa_family != AF_INET)
224	goto out;
225	err = -EINVAL;
226	if (data->gd_version < 2 \|\| data->gd_version > NFSSVC_MAXVERS)
227	goto out;
228
229	res = buf;
230	sin = (struct sockaddr_in *)&data->gd_addr;
231	exp_readlock();
232	if (!(clp = auth_unix_lookup(sin->sin_addr)))
233	err = -EPERM;
234	else {
235	err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
236	auth_domain_put(clp);
237	}
238	exp_readunlock();
239
240	if (err == 0) {
241	memset(res,0, NFS_FHSIZE);
242	memcpy(res, &fh.fh_base, fh.fh_size);
243	err = NFS_FHSIZE;
244	}
245	out:
246	return err;
247	}
248
249	static ssize_t write_filehandle(struct file file, char buf, size_t size)
250	{
251	/* request is:
252	* domain path maxsize
253	* response is
254	* filehandle
255	*
256	* qword quoting is used, so filehandle will be \x....
257	*/
258	char dname, path;
259	int maxsize;
260	char *mesg = buf;
261	int len;
262	struct auth_domain *dom;
263	struct knfsd_fh fh;
264
265	if (buf[size-1] != '\n')
266	return -EINVAL;
267	buf[size-1] = 0;
268
269	dname = mesg;
270	len = qword_get(&mesg, dname, size);
271	if (len <= 0) return -EINVAL;
272
273	path = dname+len+1;
274	len = qword_get(&mesg, path, size);
275	if (len <= 0) return -EINVAL;
276
277	len = get_int(&mesg, &maxsize);
278	if (len)
279	return len;
280
281	if (maxsize < NFS_FHSIZE)
282	return -EINVAL;
283	if (maxsize > NFS3_FHSIZE)
284	maxsize = NFS3_FHSIZE;
285
286	if (qword_get(&mesg, mesg, size)>0)
287	return -EINVAL;
288
289	/* we have all the words, they are in buf.. */
290	dom = unix_domain_find(dname);
291	if (!dom)
292	return -ENOMEM;
293
294	len = exp_rootfh(dom, path, &fh, maxsize);
295	auth_domain_put(dom);
296	if (len)
297	return len;
298
299	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
300	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
301	mesg[-1] = '\n';
302	return mesg - buf;
303	}
304
305	extern int nfsd_nrthreads(void);
306
307	static ssize_t write_threads(struct file file, char buf, size_t size)
308	{
309	/* if size > 0, look for a number of threads and call nfsd_svc
310	* then write out number of threads as reply
311	*/
312	char *mesg = buf;
313	int rv;
314	if (size > 0) {
315	int newthreads;
316	rv = get_int(&mesg, &newthreads);
317	if (rv)
318	return rv;
319	if (newthreads <0)
320	return -EINVAL;
321	rv = nfsd_svc(2049, newthreads);
322	if (rv)
323	return rv;
324	}
325	sprintf(buf, "%d\n", nfsd_nrthreads());
326	return strlen(buf);
327	}
328
329	extern time_t nfs4_leasetime(void);
330
331	static ssize_t write_leasetime(struct file file, char buf, size_t size)
332	{
333	/* if size > 10 seconds, call
334	* nfs4_reset_lease() then write out the new lease (seconds) as reply
335	*/
336	char *mesg = buf;
337	int rv;
338
339	if (size > 0) {
340	int lease;
341	rv = get_int(&mesg, &lease);
342	if (rv)
343	return rv;
344	if (lease < 10 \|\| lease > 3600)
345	return -EINVAL;
346	nfs4_reset_lease(lease);
347	}
348	sprintf(buf, "%ld\n", nfs4_lease_time());
349	return strlen(buf);
350	}
351
352	/----------------------------------------------------------------------------/
353	/*
354	* populating the filesystem.
355	*/
356
357	static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
358	{
359	static struct tree_descr nfsd_files[] = {
360	[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
361	[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
362	[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
363	[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
364	[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
365	[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR\|S_IRUSR},
366	[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR\|S_IRUSR},
367	[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
368	[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR\|S_IRUSR},
369	[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR\|S_IRUSR},
370	#ifdef CONFIG_NFSD_V4
371	[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR\|S_IRUSR},
372	#endif
373	/* last one */ {""}
374	};
375	return simple_fill_super(sb, 0x6e667364, nfsd_files);
376	}
377
378	static struct super_block nfsd_get_sb(struct file_system_type fs_type,
379	int flags, const char dev_name, void data)
380	{
381	return get_sb_single(fs_type, flags, data, nfsd_fill_super);
382	}
383
384	static struct file_system_type nfsd_fs_type = {
385	.owner = THIS_MODULE,
386	.name = "nfsd",
387	.get_sb = nfsd_get_sb,
388	.kill_sb = kill_litter_super,
389	};
390
391	static int __init init_nfsd(void)
392	{
393	int retval;
394	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
395
396	nfsd_stat_init(); /* Statistics */
397	nfsd_cache_init(); /* RPC reply cache */
398	nfsd_export_init(); /* Exports table */
399	nfsd_lockd_init(); /* lockd->nfsd callbacks */
400	#ifdef CONFIG_NFSD_V4
401	nfsd_idmap_init(); /* Name to ID mapping */
402	#endif /* CONFIG_NFSD_V4 */
403	if (proc_mkdir("fs/nfs", NULL)) {
404	struct proc_dir_entry *entry;
405	entry = create_proc_entry("fs/nfs/exports", 0, NULL);
406	if (entry)
407	entry->proc_fops = &exports_operations;
408	}
409	retval = register_filesystem(&nfsd_fs_type);
410	if (retval) {
411	nfsd_export_shutdown();
412	nfsd_cache_shutdown();
413	remove_proc_entry("fs/nfs/exports", NULL);
414	remove_proc_entry("fs/nfs", NULL);
415	nfsd_stat_shutdown();
416	nfsd_lockd_shutdown();
417	}
418	return retval;
419	}
420
421	static void __exit exit_nfsd(void)
422	{
423	nfsd_export_shutdown();
424	nfsd_cache_shutdown();
425	remove_proc_entry("fs/nfs/exports", NULL);
426	remove_proc_entry("fs/nfs", NULL);
427	nfsd_stat_shutdown();
428	nfsd_lockd_shutdown();
429	#ifdef CONFIG_NFSD_V4
430	nfsd_idmap_shutdown();
431	#endif /* CONFIG_NFSD_V4 */
432	unregister_filesystem(&nfsd_fs_type);
433	}
434
435	MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
436	MODULE_LICENSE("GPL");
437	module_init(init_nfsd)
438	module_exit(exit_nfsd)