[net-next-2.6.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,
	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 ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
{
	if (! file->private_data) {
		/* An attempt to read a transaction file without writing
		 * causes a 0-byte write so that the file can return
		 * state information
		 */
		ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
		if (rv < 0)
			return rv;
	}
	return simple_transaction_read(file, buf, size, pos);
}

static struct file_operations transaction_ops = {
	.write		= nfsctl_transaction_write,
	.read		= nfsctl_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)
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,
0964a3d3	54	NFSD_RecoveryDir,
1da177e4 LT	55	};
	56
	57	/*
	58	* write() for these nodes.
	59	*/
	60	static ssize_t write_svc(struct file file, char buf, size_t size);
	61	static ssize_t write_add(struct file file, char buf, size_t size);
	62	static ssize_t write_del(struct file file, char buf, size_t size);
	63	static ssize_t write_export(struct file file, char buf, size_t size);
	64	static ssize_t write_unexport(struct file file, char buf, size_t size);
	65	static ssize_t write_getfd(struct file file, char buf, size_t size);
	66	static ssize_t write_getfs(struct file file, char buf, size_t size);
	67	static ssize_t write_filehandle(struct file file, char buf, size_t size);
	68	static ssize_t write_threads(struct file file, char buf, size_t size);
	69	static ssize_t write_leasetime(struct file file, char buf, size_t size);
0964a3d3	70	static ssize_t write_recoverydir(struct file file, char buf, size_t size);
1da177e4 LT	71
	72	static ssize_t (write_op[])(struct file , char *, size_t) = {
	73	[NFSD_Svc] = write_svc,
	74	[NFSD_Add] = write_add,
	75	[NFSD_Del] = write_del,
	76	[NFSD_Export] = write_export,
	77	[NFSD_Unexport] = write_unexport,
	78	[NFSD_Getfd] = write_getfd,
	79	[NFSD_Getfs] = write_getfs,
	80	[NFSD_Fh] = write_filehandle,
	81	[NFSD_Threads] = write_threads,
	82	[NFSD_Leasetime] = write_leasetime,
0964a3d3	83	[NFSD_RecoveryDir] = write_recoverydir,
1da177e4 LT	84	};
	85
	86	static ssize_t nfsctl_transaction_write(struct file file, const char __user buf, size_t size, loff_t *pos)
	87	{
	88	ino_t ino = file->f_dentry->d_inode->i_ino;
	89	char *data;
	90	ssize_t rv;
	91
	92	if (ino >= sizeof(write_op)/sizeof(write_op[0]) \|\| !write_op[ino])
	93	return -EINVAL;
	94
	95	data = simple_transaction_get(file, buf, size);
	96	if (IS_ERR(data))
	97	return PTR_ERR(data);
	98
	99	rv = write_op[ino](file, data, size);
	100	if (rv>0) {
	101	simple_transaction_set(file, rv);
	102	rv = size;
	103	}
	104	return rv;
	105	}
	106
7390022d N	107	static ssize_t nfsctl_transaction_read(struct file file, char __user buf, size_t size, loff_t *pos)
	108	{
	109	if (! file->private_data) {
	110	/* An attempt to read a transaction file without writing
	111	* causes a 0-byte write so that the file can return
	112	* state information
	113	*/
	114	ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
	115	if (rv < 0)
	116	return rv;
	117	}
	118	return simple_transaction_read(file, buf, size, pos);
	119	}
	120
1da177e4 LT	121	static struct file_operations transaction_ops = {
1da177e4 LT	122	.write = nfsctl_transaction_write,
7390022d	123	.read = nfsctl_transaction_read,
1da177e4 LT	124	.release = simple_transaction_release,
	125	};
	126
	127	extern struct seq_operations nfs_exports_op;
	128	static int exports_open(struct inode inode, struct file file)
	129	{
	130	return seq_open(file, &nfs_exports_op);
	131	}
	132
	133	static struct file_operations exports_operations = {
	134	.open = exports_open,
	135	.read = seq_read,
	136	.llseek = seq_lseek,
	137	.release = seq_release,
	138	};
	139
	140	/----------------------------------------------------------------------------/
	141	/*
	142	* payload - write methods
	143	* If the method has a response, the response should be put in buf,
	144	* and the length returned. Otherwise return 0 or and -error.
	145	*/
	146
	147	static ssize_t write_svc(struct file file, char buf, size_t size)
	148	{
	149	struct nfsctl_svc *data;
	150	if (size < sizeof(*data))
	151	return -EINVAL;
	152	data = (struct nfsctl_svc*) buf;
	153	return nfsd_svc(data->svc_port, data->svc_nthreads);
	154	}
	155
	156	static ssize_t write_add(struct file file, char buf, size_t size)
	157	{
	158	struct nfsctl_client *data;
	159	if (size < sizeof(*data))
	160	return -EINVAL;
	161	data = (struct nfsctl_client *)buf;
	162	return exp_addclient(data);
	163	}
	164
	165	static ssize_t write_del(struct file file, char buf, size_t size)
	166	{
	167	struct nfsctl_client *data;
	168	if (size < sizeof(*data))
	169	return -EINVAL;
	170	data = (struct nfsctl_client *)buf;
	171	return exp_delclient(data);
	172	}
	173
	174	static ssize_t write_export(struct file file, char buf, size_t size)
	175	{
	176	struct nfsctl_export *data;
	177	if (size < sizeof(*data))
	178	return -EINVAL;
	179	data = (struct nfsctl_export*)buf;
	180	return exp_export(data);
	181	}
	182
	183	static ssize_t write_unexport(struct file file, char buf, size_t size)
	184	{
	185	struct nfsctl_export *data;
	186
	187	if (size < sizeof(*data))
188	return -EINVAL;
189	data = (struct nfsctl_export*)buf;
190	return exp_unexport(data);
191	}
192
193	static ssize_t write_getfs(struct file file, char buf, size_t size)
194	{
195	struct nfsctl_fsparm *data;
196	struct sockaddr_in *sin;
197	struct auth_domain *clp;
198	int err = 0;
199	struct knfsd_fh *res;
200
201	if (size < sizeof(*data))
202	return -EINVAL;
203	data = (struct nfsctl_fsparm*)buf;
204	err = -EPROTONOSUPPORT;
205	if (data->gd_addr.sa_family != AF_INET)
206	goto out;
207	sin = (struct sockaddr_in *)&data->gd_addr;
208	if (data->gd_maxlen > NFS3_FHSIZE)
209	data->gd_maxlen = NFS3_FHSIZE;
210
211	res = (struct knfsd_fh*)buf;
212
213	exp_readlock();
214	if (!(clp = auth_unix_lookup(sin->sin_addr)))
215	err = -EPERM;
216	else {
217	err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
218	auth_domain_put(clp);
219	}
220	exp_readunlock();
221	if (err == 0)
222	err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
223	out:
224	return err;
225	}
226
227	static ssize_t write_getfd(struct file file, char buf, size_t size)
228	{
229	struct nfsctl_fdparm *data;
230	struct sockaddr_in *sin;
231	struct auth_domain *clp;
232	int err = 0;
233	struct knfsd_fh fh;
234	char *res;
235
236	if (size < sizeof(*data))
237	return -EINVAL;
238	data = (struct nfsctl_fdparm*)buf;
239	err = -EPROTONOSUPPORT;
240	if (data->gd_addr.sa_family != AF_INET)
241	goto out;
242	err = -EINVAL;
243	if (data->gd_version < 2 \|\| data->gd_version > NFSSVC_MAXVERS)
244	goto out;
245
246	res = buf;
247	sin = (struct sockaddr_in *)&data->gd_addr;
248	exp_readlock();
249	if (!(clp = auth_unix_lookup(sin->sin_addr)))
250	err = -EPERM;
251	else {
252	err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
253	auth_domain_put(clp);
254	}
255	exp_readunlock();
256
257	if (err == 0) {
258	memset(res,0, NFS_FHSIZE);
259	memcpy(res, &fh.fh_base, fh.fh_size);
260	err = NFS_FHSIZE;
261	}
262	out:
263	return err;
264	}
265
266	static ssize_t write_filehandle(struct file file, char buf, size_t size)
267	{
268	/* request is:
269	* domain path maxsize
270	* response is
271	* filehandle
272	*
273	* qword quoting is used, so filehandle will be \x....
274	*/
275	char dname, path;
276	int maxsize;
277	char *mesg = buf;
278	int len;
279	struct auth_domain *dom;
280	struct knfsd_fh fh;
281
282	if (buf[size-1] != '\n')
283	return -EINVAL;
284	buf[size-1] = 0;
285
286	dname = mesg;
287	len = qword_get(&mesg, dname, size);
288	if (len <= 0) return -EINVAL;
289
290	path = dname+len+1;
291	len = qword_get(&mesg, path, size);
292	if (len <= 0) return -EINVAL;
293
294	len = get_int(&mesg, &maxsize);
295	if (len)
296	return len;
297
298	if (maxsize < NFS_FHSIZE)
299	return -EINVAL;
300	if (maxsize > NFS3_FHSIZE)
301	maxsize = NFS3_FHSIZE;
302
303	if (qword_get(&mesg, mesg, size)>0)
304	return -EINVAL;
305
306	/* we have all the words, they are in buf.. */
307	dom = unix_domain_find(dname);
308	if (!dom)
309	return -ENOMEM;
310
311	len = exp_rootfh(dom, path, &fh, maxsize);
312	auth_domain_put(dom);
313	if (len)
314	return len;
315
316	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
317	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
318	mesg[-1] = '\n';
319	return mesg - buf;
320	}
321
322	extern int nfsd_nrthreads(void);
323
324	static ssize_t write_threads(struct file file, char buf, size_t size)
325	{
326	/* if size > 0, look for a number of threads and call nfsd_svc
327	* then write out number of threads as reply
328	*/
329	char *mesg = buf;
330	int rv;
331	if (size > 0) {
332	int newthreads;
333	rv = get_int(&mesg, &newthreads);
334	if (rv)
335	return rv;
336	if (newthreads <0)
337	return -EINVAL;
338	rv = nfsd_svc(2049, newthreads);
339	if (rv)
340	return rv;
341	}
342	sprintf(buf, "%d\n", nfsd_nrthreads());
343	return strlen(buf);
344	}
345
346	extern time_t nfs4_leasetime(void);
347
348	static ssize_t write_leasetime(struct file file, char buf, size_t size)
349	{
350	/* if size > 10 seconds, call
351	* nfs4_reset_lease() then write out the new lease (seconds) as reply
352	*/
353	char *mesg = buf;
354	int rv;
355
356	if (size > 0) {
357	int lease;
358	rv = get_int(&mesg, &lease);
359	if (rv)
360	return rv;
361	if (lease < 10 \|\| lease > 3600)
362	return -EINVAL;
363	nfs4_reset_lease(lease);
364	}
365	sprintf(buf, "%ld\n", nfs4_lease_time());
366	return strlen(buf);
367	}
368
0964a3d3 N	369	static ssize_t write_recoverydir(struct file file, char buf, size_t size)
	370	{
	371	char *mesg = buf;
	372	char *recdir;
	373	int len, status;
	374
	375	if (size > PATH_MAX \|\| buf[size-1] != '\n')
	376	return -EINVAL;
	377	buf[size-1] = 0;
	378
	379	recdir = mesg;
	380	len = qword_get(&mesg, recdir, size);
	381	if (len <= 0)
	382	return -EINVAL;
	383
	384	status = nfs4_reset_recoverydir(recdir);
	385	return strlen(buf);
	386	}
	387
1da177e4 LT	388	/----------------------------------------------------------------------------/
	389	/*
	390	* populating the filesystem.
	391	*/
	392
	393	static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
	394	{
	395	static struct tree_descr nfsd_files[] = {
	396	[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
	397	[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
	398	[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
	399	[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
	400	[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
	401	[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR\|S_IRUSR},
	402	[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR\|S_IRUSR},
	403	[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
	404	[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR\|S_IRUSR},
	405	[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR\|S_IRUSR},
	406	#ifdef CONFIG_NFSD_V4
	407	[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR\|S_IRUSR},
0964a3d3	408	[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR\|S_IRUSR},
1da177e4 LT	409	#endif
	410	/* last one */ {""}
	411	};
	412	return simple_fill_super(sb, 0x6e667364, nfsd_files);
	413	}
	414
	415	static struct super_block nfsd_get_sb(struct file_system_type fs_type,
	416	int flags, const char dev_name, void data)
	417	{
	418	return get_sb_single(fs_type, flags, data, nfsd_fill_super);
	419	}
	420
	421	static struct file_system_type nfsd_fs_type = {
	422	.owner = THIS_MODULE,
	423	.name = "nfsd",
	424	.get_sb = nfsd_get_sb,
	425	.kill_sb = kill_litter_super,
	426	};
	427
	428	static int __init init_nfsd(void)
	429	{
	430	int retval;
	431	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
	432
	433	nfsd_stat_init(); /* Statistics */
	434	nfsd_cache_init(); /* RPC reply cache */
	435	nfsd_export_init(); /* Exports table */
	436	nfsd_lockd_init(); /* lockd->nfsd callbacks */
ac4d8ff2	437	nfs4_state_init(); /* NFSv4 locking state */
1da177e4	438	nfsd_idmap_init(); /* Name to ID mapping */
1da177e4 LT	439	if (proc_mkdir("fs/nfs", NULL)) {
	440	struct proc_dir_entry *entry;
	441	entry = create_proc_entry("fs/nfs/exports", 0, NULL);
	442	if (entry)
	443	entry->proc_fops = &exports_operations;
	444	}
	445	retval = register_filesystem(&nfsd_fs_type);
	446	if (retval) {
	447	nfsd_export_shutdown();
	448	nfsd_cache_shutdown();
	449	remove_proc_entry("fs/nfs/exports", NULL);
	450	remove_proc_entry("fs/nfs", NULL);
	451	nfsd_stat_shutdown();
	452	nfsd_lockd_shutdown();
	453	}
	454	return retval;
	455	}
	456
	457	static void __exit exit_nfsd(void)
	458	{
	459	nfsd_export_shutdown();
	460	nfsd_cache_shutdown();
	461	remove_proc_entry("fs/nfs/exports", NULL);
	462	remove_proc_entry("fs/nfs", NULL);
	463	nfsd_stat_shutdown();
	464	nfsd_lockd_shutdown();
1da177e4	465	nfsd_idmap_shutdown();
1da177e4 LT	466	unregister_filesystem(&nfsd_fs_type);
	467	}
	468
	469	MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
	470	MODULE_LICENSE("GPL");
	471	module_init(init_nfsd)
	472	module_exit(exit_nfsd)