[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/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/string.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>

unsigned int nfsd_versbits = ~0;

/*
 *	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_Versions,
	/*
	 * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
	 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
	 */
#ifdef CONFIG_NFSD_V4
	NFSD_Leasetime,
	NFSD_RecoveryDir,
#endif
};

/*
 * 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_versions(struct file *file, char *buf, size_t size);
#ifdef CONFIG_NFSD_V4
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);
#endif

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_Versions] = write_versions,
#ifdef CONFIG_NFSD_V4
	[NFSD_Leasetime] = write_leasetime,
	[NFSD_RecoveryDir] = write_recoverydir,
#endif
};

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 >= ARRAY_SIZE(write_op) || !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 const 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 const 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);
}

static ssize_t write_versions(struct file *file, char *buf, size_t size)
{
	/*
	 * Format:
	 *   [-/+]vers [-/+]vers ...
	 */
	char *mesg = buf;
	char *vers, sign;
	int len, num;
	ssize_t tlen = 0;
	char *sep;

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

		vers = mesg;
		len = qword_get(&mesg, vers, size);
		if (len <= 0) return -EINVAL;
		do {
			sign = *vers;
			if (sign == '+' || sign == '-')
				num = simple_strtol((vers+1), NULL, 0);
			else
				num = simple_strtol(vers, NULL, 0);
			switch(num) {
			case 2:
			case 3:
			case 4:
				if (sign != '-')
					NFSCTL_VERSET(nfsd_versbits, num);
				else
					NFSCTL_VERUNSET(nfsd_versbits, num);
				break;
			default:
				return -EINVAL;
			}
			vers += len + 1;
			tlen += len;
		} while ((len = qword_get(&mesg, vers, size)) > 0);
		/* If all get turned off, turn them back on, as
		 * having no versions is BAD
		 */
		if ((nfsd_versbits & NFSCTL_VERALL)==0)
			nfsd_versbits = NFSCTL_VERALL;
	}
	/* Now write current state into reply buffer */
	len = 0;
	sep = "";
	for (num=2 ; num <= 4 ; num++)
		if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) {
			len += sprintf(buf+len, "%s%c%d", sep,
				       NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-',
				       num);
			sep = " ";
		}
	len += sprintf(buf+len, "\n");
	return len;
}

#ifdef CONFIG_NFSD_V4
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);
}
#endif

/*----------------------------------------------------------------------------*/
/*
 *	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},
		[NFSD_Versions] = {"versions", &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 int nfsd_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
}

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
1da177e4 LT	9	#include <linux/module.h>
	10
	11	#include <linux/linkage.h>
	12	#include <linux/time.h>
	13	#include <linux/errno.h>
	14	#include <linux/fs.h>
	15	#include <linux/fcntl.h>
	16	#include <linux/net.h>
	17	#include <linux/in.h>
	18	#include <linux/syscalls.h>
	19	#include <linux/unistd.h>
	20	#include <linux/slab.h>
	21	#include <linux/proc_fs.h>
	22	#include <linux/seq_file.h>
	23	#include <linux/pagemap.h>
	24	#include <linux/init.h>
70c3b76c	25	#include <linux/string.h>
1da177e4 LT	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
70c3b76c N	38	unsigned int nfsd_versbits = ~0;
70c3b76c N	39
1da177e4 LT	40	/*
	41	* We have a single directory with 9 nodes in it.
	42	*/
	43	enum {
	44	NFSD_Root = 1,
	45	NFSD_Svc,
	46	NFSD_Add,
	47	NFSD_Del,
	48	NFSD_Export,
	49	NFSD_Unexport,
	50	NFSD_Getfd,
	51	NFSD_Getfs,
	52	NFSD_List,
	53	NFSD_Fh,
	54	NFSD_Threads,
70c3b76c N	55	NFSD_Versions,
	56	/*
	57	* The below MUST come last. Otherwise we leave a hole in nfsd_files[]
	58	* with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
	59	*/
	60	#ifdef CONFIG_NFSD_V4
1da177e4	61	NFSD_Leasetime,
0964a3d3	62	NFSD_RecoveryDir,
70c3b76c	63	#endif
1da177e4 LT	64	};
	65
	66	/*
	67	* write() for these nodes.
	68	*/
	69	static ssize_t write_svc(struct file file, char buf, size_t size);
	70	static ssize_t write_add(struct file file, char buf, size_t size);
	71	static ssize_t write_del(struct file file, char buf, size_t size);
	72	static ssize_t write_export(struct file file, char buf, size_t size);
	73	static ssize_t write_unexport(struct file file, char buf, size_t size);
	74	static ssize_t write_getfd(struct file file, char buf, size_t size);
	75	static ssize_t write_getfs(struct file file, char buf, size_t size);
	76	static ssize_t write_filehandle(struct file file, char buf, size_t size);
	77	static ssize_t write_threads(struct file file, char buf, size_t size);
70c3b76c N	78	static ssize_t write_versions(struct file file, char buf, size_t size);
70c3b76c N	79	#ifdef CONFIG_NFSD_V4
1da177e4	80	static ssize_t write_leasetime(struct file file, char buf, size_t size);
0964a3d3	81	static ssize_t write_recoverydir(struct file file, char buf, size_t size);
70c3b76c	82	#endif
1da177e4 LT	83
	84	static ssize_t (write_op[])(struct file , char *, size_t) = {
	85	[NFSD_Svc] = write_svc,
	86	[NFSD_Add] = write_add,
	87	[NFSD_Del] = write_del,
	88	[NFSD_Export] = write_export,
	89	[NFSD_Unexport] = write_unexport,
	90	[NFSD_Getfd] = write_getfd,
	91	[NFSD_Getfs] = write_getfs,
	92	[NFSD_Fh] = write_filehandle,
	93	[NFSD_Threads] = write_threads,
70c3b76c N	94	[NFSD_Versions] = write_versions,
70c3b76c N	95	#ifdef CONFIG_NFSD_V4
1da177e4	96	[NFSD_Leasetime] = write_leasetime,
0964a3d3	97	[NFSD_RecoveryDir] = write_recoverydir,
70c3b76c	98	#endif
1da177e4 LT	99	};
	100
	101	static ssize_t nfsctl_transaction_write(struct file file, const char __user buf, size_t size, loff_t *pos)
	102	{
	103	ino_t ino = file->f_dentry->d_inode->i_ino;
	104	char *data;
	105	ssize_t rv;
	106
e8c96f8c	107	if (ino >= ARRAY_SIZE(write_op) \|\| !write_op[ino])
1da177e4 LT	108	return -EINVAL;
	109
	110	data = simple_transaction_get(file, buf, size);
	111	if (IS_ERR(data))
	112	return PTR_ERR(data);
	113
	114	rv = write_op[ino](file, data, size);
	115	if (rv>0) {
	116	simple_transaction_set(file, rv);
	117	rv = size;
	118	}
	119	return rv;
	120	}
	121
7390022d N	122	static ssize_t nfsctl_transaction_read(struct file file, char __user buf, size_t size, loff_t *pos)
	123	{
	124	if (! file->private_data) {
	125	/* An attempt to read a transaction file without writing
	126	* causes a 0-byte write so that the file can return
	127	* state information
	128	*/
	129	ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
	130	if (rv < 0)
	131	return rv;
	132	}
	133	return simple_transaction_read(file, buf, size, pos);
	134	}
	135
4b6f5d20	136	static const struct file_operations transaction_ops = {
1da177e4	137	.write = nfsctl_transaction_write,
7390022d	138	.read = nfsctl_transaction_read,
1da177e4 LT	139	.release = simple_transaction_release,
	140	};
	141
	142	extern struct seq_operations nfs_exports_op;
	143	static int exports_open(struct inode inode, struct file file)
	144	{
	145	return seq_open(file, &nfs_exports_op);
	146	}
	147
4b6f5d20	148	static const struct file_operations exports_operations = {
1da177e4 LT	149	.open = exports_open,
	150	.read = seq_read,
	151	.llseek = seq_lseek,
	152	.release = seq_release,
	153	};
	154
	155	/----------------------------------------------------------------------------/
	156	/*
	157	* payload - write methods
	158	* If the method has a response, the response should be put in buf,
	159	* and the length returned. Otherwise return 0 or and -error.
	160	*/
	161
	162	static ssize_t write_svc(struct file file, char buf, size_t size)
	163	{
	164	struct nfsctl_svc *data;
	165	if (size < sizeof(*data))
	166	return -EINVAL;
	167	data = (struct nfsctl_svc*) buf;
	168	return nfsd_svc(data->svc_port, data->svc_nthreads);
	169	}
	170
	171	static ssize_t write_add(struct file file, char buf, size_t size)
	172	{
	173	struct nfsctl_client *data;
	174	if (size < sizeof(*data))
	175	return -EINVAL;
	176	data = (struct nfsctl_client *)buf;
	177	return exp_addclient(data);
	178	}
	179
	180	static ssize_t write_del(struct file file, char buf, size_t size)
	181	{
	182	struct nfsctl_client *data;
	183	if (size < sizeof(*data))
	184	return -EINVAL;
	185	data = (struct nfsctl_client *)buf;
	186	return exp_delclient(data);
	187	}
	188
	189	static ssize_t write_export(struct file file, char buf, size_t size)
	190	{
	191	struct nfsctl_export *data;
	192	if (size < sizeof(*data))
	193	return -EINVAL;
	194	data = (struct nfsctl_export*)buf;
	195	return exp_export(data);
	196	}
	197
	198	static ssize_t write_unexport(struct file file, char buf, size_t size)
	199	{
	200	struct nfsctl_export *data;
	201
	202	if (size < sizeof(*data))
	203	return -EINVAL;
	204	data = (struct nfsctl_export*)buf;
	205	return exp_unexport(data);
	206	}
	207
	208	static ssize_t write_getfs(struct file file, char buf, size_t size)
	209	{
	210	struct nfsctl_fsparm *data;
	211	struct sockaddr_in *sin;
	212	struct auth_domain *clp;
213	int err = 0;
214	struct knfsd_fh *res;
215
216	if (size < sizeof(*data))
217	return -EINVAL;
218	data = (struct nfsctl_fsparm*)buf;
219	err = -EPROTONOSUPPORT;
220	if (data->gd_addr.sa_family != AF_INET)
221	goto out;
222	sin = (struct sockaddr_in *)&data->gd_addr;
223	if (data->gd_maxlen > NFS3_FHSIZE)
224	data->gd_maxlen = NFS3_FHSIZE;
225
226	res = (struct knfsd_fh*)buf;
227
228	exp_readlock();
229	if (!(clp = auth_unix_lookup(sin->sin_addr)))
230	err = -EPERM;
231	else {
232	err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
233	auth_domain_put(clp);
234	}
235	exp_readunlock();
236	if (err == 0)
237	err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
238	out:
239	return err;
240	}
241
242	static ssize_t write_getfd(struct file file, char buf, size_t size)
243	{
244	struct nfsctl_fdparm *data;
245	struct sockaddr_in *sin;
246	struct auth_domain *clp;
247	int err = 0;
248	struct knfsd_fh fh;
249	char *res;
250
251	if (size < sizeof(*data))
252	return -EINVAL;
253	data = (struct nfsctl_fdparm*)buf;
254	err = -EPROTONOSUPPORT;
255	if (data->gd_addr.sa_family != AF_INET)
256	goto out;
257	err = -EINVAL;
258	if (data->gd_version < 2 \|\| data->gd_version > NFSSVC_MAXVERS)
259	goto out;
260
261	res = buf;
262	sin = (struct sockaddr_in *)&data->gd_addr;
263	exp_readlock();
264	if (!(clp = auth_unix_lookup(sin->sin_addr)))
265	err = -EPERM;
266	else {
267	err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
268	auth_domain_put(clp);
269	}
270	exp_readunlock();
271
272	if (err == 0) {
273	memset(res,0, NFS_FHSIZE);
274	memcpy(res, &fh.fh_base, fh.fh_size);
275	err = NFS_FHSIZE;
276	}
277	out:
278	return err;
279	}
280
281	static ssize_t write_filehandle(struct file file, char buf, size_t size)
282	{
283	/* request is:
284	* domain path maxsize
285	* response is
286	* filehandle
287	*
288	* qword quoting is used, so filehandle will be \x....
289	*/
290	char dname, path;
291	int maxsize;
292	char *mesg = buf;
293	int len;
294	struct auth_domain *dom;
295	struct knfsd_fh fh;
296
297	if (buf[size-1] != '\n')
298	return -EINVAL;
299	buf[size-1] = 0;
300
301	dname = mesg;
302	len = qword_get(&mesg, dname, size);
303	if (len <= 0) return -EINVAL;
304
305	path = dname+len+1;
306	len = qword_get(&mesg, path, size);
307	if (len <= 0) return -EINVAL;
308
309	len = get_int(&mesg, &maxsize);
310	if (len)
311	return len;
312
313	if (maxsize < NFS_FHSIZE)
314	return -EINVAL;
315	if (maxsize > NFS3_FHSIZE)
316	maxsize = NFS3_FHSIZE;
317
318	if (qword_get(&mesg, mesg, size)>0)
319	return -EINVAL;
320
321	/* we have all the words, they are in buf.. */
322	dom = unix_domain_find(dname);
323	if (!dom)
324	return -ENOMEM;
325
326	len = exp_rootfh(dom, path, &fh, maxsize);
327	auth_domain_put(dom);
328	if (len)
329	return len;
330
331	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
332	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
333	mesg[-1] = '\n';
334	return mesg - buf;
335	}
336
337	extern int nfsd_nrthreads(void);
338
339	static ssize_t write_threads(struct file file, char buf, size_t size)
340	{
341	/* if size > 0, look for a number of threads and call nfsd_svc
342	* then write out number of threads as reply
343	*/
344	char *mesg = buf;
345	int rv;
346	if (size > 0) {
347	int newthreads;
348	rv = get_int(&mesg, &newthreads);
349	if (rv)
350	return rv;
351	if (newthreads <0)
352	return -EINVAL;
353	rv = nfsd_svc(2049, newthreads);
354	if (rv)
355	return rv;
356	}
357	sprintf(buf, "%d\n", nfsd_nrthreads());
358	return strlen(buf);
359	}
360
70c3b76c N	361	static ssize_t write_versions(struct file file, char buf, size_t size)
	362	{
	363	/*
	364	* Format:
	365	* [-/+]vers [-/+]vers ...
	366	*/
	367	char *mesg = buf;
	368	char *vers, sign;
	369	int len, num;
	370	ssize_t tlen = 0;
	371	char *sep;
	372
	373	if (size>0) {
	374	if (nfsd_serv)
	375	return -EBUSY;
	376	if (buf[size-1] != '\n')
	377	return -EINVAL;
	378	buf[size-1] = 0;
	379
	380	vers = mesg;
	381	len = qword_get(&mesg, vers, size);
	382	if (len <= 0) return -EINVAL;
	383	do {
	384	sign = *vers;
	385	if (sign == '+' \|\| sign == '-')
	386	num = simple_strtol((vers+1), NULL, 0);
	387	else
	388	num = simple_strtol(vers, NULL, 0);
	389	switch(num) {
	390	case 2:
	391	case 3:
	392	case 4:
	393	if (sign != '-')
	394	NFSCTL_VERSET(nfsd_versbits, num);
	395	else
	396	NFSCTL_VERUNSET(nfsd_versbits, num);
	397	break;
	398	default:
	399	return -EINVAL;
	400	}
	401	vers += len + 1;
	402	tlen += len;
	403	} while ((len = qword_get(&mesg, vers, size)) > 0);
	404	/* If all get turned off, turn them back on, as
	405	* having no versions is BAD
	406	*/
	407	if ((nfsd_versbits & NFSCTL_VERALL)==0)
	408	nfsd_versbits = NFSCTL_VERALL;
	409	}
	410	/* Now write current state into reply buffer */
	411	len = 0;
	412	sep = "";
	413	for (num=2 ; num <= 4 ; num++)
	414	if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) {
	415	len += sprintf(buf+len, "%s%c%d", sep,
	416	NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-',
	417	num);
	418	sep = " ";
	419	}
	420	len += sprintf(buf+len, "\n");
	421	return len;
	422	}
	423
	424	#ifdef CONFIG_NFSD_V4
1da177e4 LT	425	extern time_t nfs4_leasetime(void);
	426
	427	static ssize_t write_leasetime(struct file file, char buf, size_t size)
	428	{
	429	/* if size > 10 seconds, call
	430	* nfs4_reset_lease() then write out the new lease (seconds) as reply
	431	*/
	432	char *mesg = buf;
	433	int rv;
	434
	435	if (size > 0) {
	436	int lease;
	437	rv = get_int(&mesg, &lease);
	438	if (rv)
	439	return rv;
	440	if (lease < 10 \|\| lease > 3600)
	441	return -EINVAL;
	442	nfs4_reset_lease(lease);
	443	}
	444	sprintf(buf, "%ld\n", nfs4_lease_time());
	445	return strlen(buf);
	446	}
	447
0964a3d3 N	448	static ssize_t write_recoverydir(struct file file, char buf, size_t size)
	449	{
	450	char *mesg = buf;
	451	char *recdir;
	452	int len, status;
	453
	454	if (size > PATH_MAX \|\| buf[size-1] != '\n')
	455	return -EINVAL;
	456	buf[size-1] = 0;
	457
	458	recdir = mesg;
	459	len = qword_get(&mesg, recdir, size);
	460	if (len <= 0)
	461	return -EINVAL;
	462
	463	status = nfs4_reset_recoverydir(recdir);
	464	return strlen(buf);
	465	}
70c3b76c	466	#endif
0964a3d3	467
1da177e4 LT	468	/----------------------------------------------------------------------------/
	469	/*
	470	* populating the filesystem.
	471	*/
	472
	473	static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
	474	{
	475	static struct tree_descr nfsd_files[] = {
	476	[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
	477	[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
	478	[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
	479	[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
	480	[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
	481	[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR\|S_IRUSR},
	482	[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR\|S_IRUSR},
	483	[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
	484	[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR\|S_IRUSR},
	485	[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR\|S_IRUSR},
70c3b76c	486	[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR\|S_IRUSR},
1da177e4 LT	487	#ifdef CONFIG_NFSD_V4
1da177e4 LT	488	[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR\|S_IRUSR},
0964a3d3	489	[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR\|S_IRUSR},
1da177e4 LT	490	#endif
	491	/* last one */ {""}
	492	};
	493	return simple_fill_super(sb, 0x6e667364, nfsd_files);
	494	}
	495
454e2398 DH	496	static int nfsd_get_sb(struct file_system_type *fs_type,
454e2398 DH	497	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	498	{
454e2398	499	return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
1da177e4 LT	500	}
	501
	502	static struct file_system_type nfsd_fs_type = {
	503	.owner = THIS_MODULE,
	504	.name = "nfsd",
	505	.get_sb = nfsd_get_sb,
	506	.kill_sb = kill_litter_super,
	507	};
	508
	509	static int __init init_nfsd(void)
	510	{
	511	int retval;
	512	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
	513
	514	nfsd_stat_init(); /* Statistics */
	515	nfsd_cache_init(); /* RPC reply cache */
	516	nfsd_export_init(); /* Exports table */
	517	nfsd_lockd_init(); /* lockd->nfsd callbacks */
ac4d8ff2	518	nfs4_state_init(); /* NFSv4 locking state */
1da177e4	519	nfsd_idmap_init(); /* Name to ID mapping */
1da177e4 LT	520	if (proc_mkdir("fs/nfs", NULL)) {
	521	struct proc_dir_entry *entry;
	522	entry = create_proc_entry("fs/nfs/exports", 0, NULL);
	523	if (entry)
	524	entry->proc_fops = &exports_operations;
	525	}
	526	retval = register_filesystem(&nfsd_fs_type);
	527	if (retval) {
	528	nfsd_export_shutdown();
	529	nfsd_cache_shutdown();
	530	remove_proc_entry("fs/nfs/exports", NULL);
	531	remove_proc_entry("fs/nfs", NULL);
	532	nfsd_stat_shutdown();
	533	nfsd_lockd_shutdown();
	534	}
	535	return retval;
	536	}
	537
	538	static void __exit exit_nfsd(void)
	539	{
	540	nfsd_export_shutdown();
	541	nfsd_cache_shutdown();
	542	remove_proc_entry("fs/nfs/exports", NULL);
	543	remove_proc_entry("fs/nfs", NULL);
	544	nfsd_stat_shutdown();
	545	nfsd_lockd_shutdown();
1da177e4	546	nfsd_idmap_shutdown();
1da177e4 LT	547	unregister_filesystem(&nfsd_fs_type);
	548	}
	549
	550	MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
	551	MODULE_LICENSE("GPL");
	552	module_init(init_nfsd)
	553	module_exit(exit_nfsd)