[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/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 >= 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);
}

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 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>
70c3b76c	26	#include <linux/string.h>
1da177e4 LT	27
	28	#include <linux/nfs.h>
	29	#include <linux/nfsd_idmap.h>
	30	#include <linux/sunrpc/svc.h>
	31	#include <linux/nfsd/nfsd.h>
	32	#include <linux/nfsd/cache.h>
	33	#include <linux/nfsd/xdr.h>
	34	#include <linux/nfsd/syscall.h>
	35	#include <linux/nfsd/interface.h>
	36
	37	#include <asm/uaccess.h>
	38
70c3b76c N	39	unsigned int nfsd_versbits = ~0;
70c3b76c N	40
1da177e4 LT	41	/*
	42	* We have a single directory with 9 nodes in it.
	43	*/
	44	enum {
	45	NFSD_Root = 1,
	46	NFSD_Svc,
	47	NFSD_Add,
	48	NFSD_Del,
	49	NFSD_Export,
	50	NFSD_Unexport,
	51	NFSD_Getfd,
	52	NFSD_Getfs,
	53	NFSD_List,
	54	NFSD_Fh,
	55	NFSD_Threads,
70c3b76c N	56	NFSD_Versions,
	57	/*
	58	* The below MUST come last. Otherwise we leave a hole in nfsd_files[]
	59	* with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
	60	*/
	61	#ifdef CONFIG_NFSD_V4
1da177e4	62	NFSD_Leasetime,
0964a3d3	63	NFSD_RecoveryDir,
70c3b76c	64	#endif
1da177e4 LT	65	};
	66
	67	/*
	68	* write() for these nodes.
	69	*/
	70	static ssize_t write_svc(struct file file, char buf, size_t size);
	71	static ssize_t write_add(struct file file, char buf, size_t size);
	72	static ssize_t write_del(struct file file, char buf, size_t size);
	73	static ssize_t write_export(struct file file, char buf, size_t size);
	74	static ssize_t write_unexport(struct file file, char buf, size_t size);
	75	static ssize_t write_getfd(struct file file, char buf, size_t size);
	76	static ssize_t write_getfs(struct file file, char buf, size_t size);
	77	static ssize_t write_filehandle(struct file file, char buf, size_t size);
	78	static ssize_t write_threads(struct file file, char buf, size_t size);
70c3b76c N	79	static ssize_t write_versions(struct file file, char buf, size_t size);
70c3b76c N	80	#ifdef CONFIG_NFSD_V4
1da177e4	81	static ssize_t write_leasetime(struct file file, char buf, size_t size);
0964a3d3	82	static ssize_t write_recoverydir(struct file file, char buf, size_t size);
70c3b76c	83	#endif
1da177e4 LT	84
	85	static ssize_t (write_op[])(struct file , char *, size_t) = {
	86	[NFSD_Svc] = write_svc,
	87	[NFSD_Add] = write_add,
	88	[NFSD_Del] = write_del,
	89	[NFSD_Export] = write_export,
	90	[NFSD_Unexport] = write_unexport,
	91	[NFSD_Getfd] = write_getfd,
	92	[NFSD_Getfs] = write_getfs,
	93	[NFSD_Fh] = write_filehandle,
	94	[NFSD_Threads] = write_threads,
70c3b76c N	95	[NFSD_Versions] = write_versions,
70c3b76c N	96	#ifdef CONFIG_NFSD_V4
1da177e4	97	[NFSD_Leasetime] = write_leasetime,
0964a3d3	98	[NFSD_RecoveryDir] = write_recoverydir,
70c3b76c	99	#endif
1da177e4 LT	100	};
	101
	102	static ssize_t nfsctl_transaction_write(struct file file, const char __user buf, size_t size, loff_t *pos)
	103	{
	104	ino_t ino = file->f_dentry->d_inode->i_ino;
	105	char *data;
	106	ssize_t rv;
	107
	108	if (ino >= sizeof(write_op)/sizeof(write_op[0]) \|\| !write_op[ino])
	109	return -EINVAL;
	110
	111	data = simple_transaction_get(file, buf, size);
	112	if (IS_ERR(data))
	113	return PTR_ERR(data);
	114
	115	rv = write_op[ino](file, data, size);
	116	if (rv>0) {
	117	simple_transaction_set(file, rv);
	118	rv = size;
	119	}
	120	return rv;
	121	}
	122
7390022d N	123	static ssize_t nfsctl_transaction_read(struct file file, char __user buf, size_t size, loff_t *pos)
	124	{
	125	if (! file->private_data) {
	126	/* An attempt to read a transaction file without writing
	127	* causes a 0-byte write so that the file can return
	128	* state information
	129	*/
	130	ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
	131	if (rv < 0)
	132	return rv;
	133	}
	134	return simple_transaction_read(file, buf, size, pos);
	135	}
	136
1da177e4 LT	137	static struct file_operations transaction_ops = {
1da177e4 LT	138	.write = nfsctl_transaction_write,
7390022d	139	.read = nfsctl_transaction_read,
1da177e4 LT	140	.release = simple_transaction_release,
	141	};
	142
	143	extern struct seq_operations nfs_exports_op;
	144	static int exports_open(struct inode inode, struct file file)
	145	{
	146	return seq_open(file, &nfs_exports_op);
	147	}
	148
	149	static struct file_operations exports_operations = {
	150	.open = exports_open,
	151	.read = seq_read,
	152	.llseek = seq_lseek,
	153	.release = seq_release,
	154	};
	155
	156	/----------------------------------------------------------------------------/
	157	/*
	158	* payload - write methods
	159	* If the method has a response, the response should be put in buf,
	160	* and the length returned. Otherwise return 0 or and -error.
	161	*/
	162
	163	static ssize_t write_svc(struct file file, char buf, size_t size)
	164	{
	165	struct nfsctl_svc *data;
	166	if (size < sizeof(*data))
	167	return -EINVAL;
	168	data = (struct nfsctl_svc*) buf;
	169	return nfsd_svc(data->svc_port, data->svc_nthreads);
	170	}
	171
	172	static ssize_t write_add(struct file file, char buf, size_t size)
	173	{
	174	struct nfsctl_client *data;
	175	if (size < sizeof(*data))
	176	return -EINVAL;
	177	data = (struct nfsctl_client *)buf;
	178	return exp_addclient(data);
	179	}
	180
	181	static ssize_t write_del(struct file file, char buf, size_t size)
	182	{
	183	struct nfsctl_client *data;
	184	if (size < sizeof(*data))
	185	return -EINVAL;
	186	data = (struct nfsctl_client *)buf;
	187	return exp_delclient(data);
	188	}
	189
	190	static ssize_t write_export(struct file file, char buf, size_t size)
	191	{
	192	struct nfsctl_export *data;
	193	if (size < sizeof(*data))
	194	return -EINVAL;
	195	data = (struct nfsctl_export*)buf;
	196	return exp_export(data);
	197	}
	198
	199	static ssize_t write_unexport(struct file file, char buf, size_t size)
	200	{
	201	struct nfsctl_export *data;
	202
	203	if (size < sizeof(*data))
204	return -EINVAL;
205	data = (struct nfsctl_export*)buf;
206	return exp_unexport(data);
207	}
208
209	static ssize_t write_getfs(struct file file, char buf, size_t size)
210	{
211	struct nfsctl_fsparm *data;
212	struct sockaddr_in *sin;
213	struct auth_domain *clp;
214	int err = 0;
215	struct knfsd_fh *res;
216
217	if (size < sizeof(*data))
218	return -EINVAL;
219	data = (struct nfsctl_fsparm*)buf;
220	err = -EPROTONOSUPPORT;
221	if (data->gd_addr.sa_family != AF_INET)
222	goto out;
223	sin = (struct sockaddr_in *)&data->gd_addr;
224	if (data->gd_maxlen > NFS3_FHSIZE)
225	data->gd_maxlen = NFS3_FHSIZE;
226
227	res = (struct knfsd_fh*)buf;
228
229	exp_readlock();
230	if (!(clp = auth_unix_lookup(sin->sin_addr)))
231	err = -EPERM;
232	else {
233	err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
234	auth_domain_put(clp);
235	}
236	exp_readunlock();
237	if (err == 0)
238	err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
239	out:
240	return err;
241	}
242
243	static ssize_t write_getfd(struct file file, char buf, size_t size)
244	{
245	struct nfsctl_fdparm *data;
246	struct sockaddr_in *sin;
247	struct auth_domain *clp;
248	int err = 0;
249	struct knfsd_fh fh;
250	char *res;
251
252	if (size < sizeof(*data))
253	return -EINVAL;
254	data = (struct nfsctl_fdparm*)buf;
255	err = -EPROTONOSUPPORT;
256	if (data->gd_addr.sa_family != AF_INET)
257	goto out;
258	err = -EINVAL;
259	if (data->gd_version < 2 \|\| data->gd_version > NFSSVC_MAXVERS)
260	goto out;
261
262	res = buf;
263	sin = (struct sockaddr_in *)&data->gd_addr;
264	exp_readlock();
265	if (!(clp = auth_unix_lookup(sin->sin_addr)))
266	err = -EPERM;
267	else {
268	err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
269	auth_domain_put(clp);
270	}
271	exp_readunlock();
272
273	if (err == 0) {
274	memset(res,0, NFS_FHSIZE);
275	memcpy(res, &fh.fh_base, fh.fh_size);
276	err = NFS_FHSIZE;
277	}
278	out:
279	return err;
280	}
281
282	static ssize_t write_filehandle(struct file file, char buf, size_t size)
283	{
284	/* request is:
285	* domain path maxsize
286	* response is
287	* filehandle
288	*
289	* qword quoting is used, so filehandle will be \x....
290	*/
291	char dname, path;
292	int maxsize;
293	char *mesg = buf;
294	int len;
295	struct auth_domain *dom;
296	struct knfsd_fh fh;
297
298	if (buf[size-1] != '\n')
299	return -EINVAL;
300	buf[size-1] = 0;
301
302	dname = mesg;
303	len = qword_get(&mesg, dname, size);
304	if (len <= 0) return -EINVAL;
305
306	path = dname+len+1;
307	len = qword_get(&mesg, path, size);
308	if (len <= 0) return -EINVAL;
309
310	len = get_int(&mesg, &maxsize);
311	if (len)
312	return len;
313
314	if (maxsize < NFS_FHSIZE)
315	return -EINVAL;
316	if (maxsize > NFS3_FHSIZE)
317	maxsize = NFS3_FHSIZE;
318
319	if (qword_get(&mesg, mesg, size)>0)
320	return -EINVAL;
321
322	/* we have all the words, they are in buf.. */
323	dom = unix_domain_find(dname);
324	if (!dom)
325	return -ENOMEM;
326
327	len = exp_rootfh(dom, path, &fh, maxsize);
328	auth_domain_put(dom);
329	if (len)
330	return len;
331
332	mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
333	qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
334	mesg[-1] = '\n';
335	return mesg - buf;
336	}
337
338	extern int nfsd_nrthreads(void);
339
340	static ssize_t write_threads(struct file file, char buf, size_t size)
341	{
342	/* if size > 0, look for a number of threads and call nfsd_svc
343	* then write out number of threads as reply
344	*/
345	char *mesg = buf;
346	int rv;
347	if (size > 0) {
348	int newthreads;
349	rv = get_int(&mesg, &newthreads);
350	if (rv)
351	return rv;
352	if (newthreads <0)
353	return -EINVAL;
354	rv = nfsd_svc(2049, newthreads);
355	if (rv)
356	return rv;
357	}
358	sprintf(buf, "%d\n", nfsd_nrthreads());
359	return strlen(buf);
360	}
361
70c3b76c N	362	static ssize_t write_versions(struct file file, char buf, size_t size)
	363	{
	364	/*
	365	* Format:
	366	* [-/+]vers [-/+]vers ...
	367	*/
	368	char *mesg = buf;
	369	char *vers, sign;
	370	int len, num;
	371	ssize_t tlen = 0;
	372	char *sep;
	373
	374	if (size>0) {
	375	if (nfsd_serv)
	376	return -EBUSY;
	377	if (buf[size-1] != '\n')
	378	return -EINVAL;
	379	buf[size-1] = 0;
	380
	381	vers = mesg;
	382	len = qword_get(&mesg, vers, size);
	383	if (len <= 0) return -EINVAL;
	384	do {
	385	sign = *vers;
	386	if (sign == '+' \|\| sign == '-')
	387	num = simple_strtol((vers+1), NULL, 0);
	388	else
	389	num = simple_strtol(vers, NULL, 0);
	390	switch(num) {
	391	case 2:
	392	case 3:
	393	case 4:
	394	if (sign != '-')
	395	NFSCTL_VERSET(nfsd_versbits, num);
	396	else
	397	NFSCTL_VERUNSET(nfsd_versbits, num);
	398	break;
	399	default:
	400	return -EINVAL;
	401	}
	402	vers += len + 1;
	403	tlen += len;
	404	} while ((len = qword_get(&mesg, vers, size)) > 0);
	405	/* If all get turned off, turn them back on, as
	406	* having no versions is BAD
	407	*/
	408	if ((nfsd_versbits & NFSCTL_VERALL)==0)
	409	nfsd_versbits = NFSCTL_VERALL;
	410	}
	411	/* Now write current state into reply buffer */
	412	len = 0;
	413	sep = "";
	414	for (num=2 ; num <= 4 ; num++)
	415	if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) {
	416	len += sprintf(buf+len, "%s%c%d", sep,
	417	NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-',
	418	num);
	419	sep = " ";
	420	}
	421	len += sprintf(buf+len, "\n");
	422	return len;
	423	}
	424
	425	#ifdef CONFIG_NFSD_V4
1da177e4 LT	426	extern time_t nfs4_leasetime(void);
	427
	428	static ssize_t write_leasetime(struct file file, char buf, size_t size)
	429	{
	430	/* if size > 10 seconds, call
	431	* nfs4_reset_lease() then write out the new lease (seconds) as reply
	432	*/
	433	char *mesg = buf;
	434	int rv;
	435
	436	if (size > 0) {
	437	int lease;
	438	rv = get_int(&mesg, &lease);
	439	if (rv)
	440	return rv;
	441	if (lease < 10 \|\| lease > 3600)
	442	return -EINVAL;
	443	nfs4_reset_lease(lease);
	444	}
	445	sprintf(buf, "%ld\n", nfs4_lease_time());
	446	return strlen(buf);
	447	}
	448
0964a3d3 N	449	static ssize_t write_recoverydir(struct file file, char buf, size_t size)
	450	{
	451	char *mesg = buf;
	452	char *recdir;
	453	int len, status;
	454
	455	if (size > PATH_MAX \|\| buf[size-1] != '\n')
	456	return -EINVAL;
	457	buf[size-1] = 0;
	458
	459	recdir = mesg;
	460	len = qword_get(&mesg, recdir, size);
	461	if (len <= 0)
	462	return -EINVAL;
	463
	464	status = nfs4_reset_recoverydir(recdir);
	465	return strlen(buf);
	466	}
70c3b76c	467	#endif
0964a3d3	468
1da177e4 LT	469	/----------------------------------------------------------------------------/
	470	/*
	471	* populating the filesystem.
	472	*/
	473
	474	static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
	475	{
	476	static struct tree_descr nfsd_files[] = {
	477	[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
	478	[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
	479	[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
	480	[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
	481	[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
	482	[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR\|S_IRUSR},
	483	[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR\|S_IRUSR},
	484	[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
	485	[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR\|S_IRUSR},
	486	[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR\|S_IRUSR},
70c3b76c	487	[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR\|S_IRUSR},
1da177e4 LT	488	#ifdef CONFIG_NFSD_V4
1da177e4 LT	489	[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR\|S_IRUSR},
0964a3d3	490	[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR\|S_IRUSR},
1da177e4 LT	491	#endif
	492	/* last one */ {""}
	493	};
	494	return simple_fill_super(sb, 0x6e667364, nfsd_files);
	495	}
	496
	497	static struct super_block nfsd_get_sb(struct file_system_type fs_type,
	498	int flags, const char dev_name, void data)
	499	{
	500	return get_sb_single(fs_type, flags, data, nfsd_fill_super);
	501	}
	502
	503	static struct file_system_type nfsd_fs_type = {
	504	.owner = THIS_MODULE,
	505	.name = "nfsd",
	506	.get_sb = nfsd_get_sb,
	507	.kill_sb = kill_litter_super,
	508	};
	509
	510	static int __init init_nfsd(void)
	511	{
	512	int retval;
	513	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
	514
	515	nfsd_stat_init(); /* Statistics */
	516	nfsd_cache_init(); /* RPC reply cache */
	517	nfsd_export_init(); /* Exports table */
	518	nfsd_lockd_init(); /* lockd->nfsd callbacks */
ac4d8ff2	519	nfs4_state_init(); /* NFSv4 locking state */
1da177e4	520	nfsd_idmap_init(); /* Name to ID mapping */
1da177e4 LT	521	if (proc_mkdir("fs/nfs", NULL)) {
	522	struct proc_dir_entry *entry;
	523	entry = create_proc_entry("fs/nfs/exports", 0, NULL);
	524	if (entry)
	525	entry->proc_fops = &exports_operations;
	526	}
	527	retval = register_filesystem(&nfsd_fs_type);
	528	if (retval) {
	529	nfsd_export_shutdown();
	530	nfsd_cache_shutdown();
	531	remove_proc_entry("fs/nfs/exports", NULL);
	532	remove_proc_entry("fs/nfs", NULL);
	533	nfsd_stat_shutdown();
	534	nfsd_lockd_shutdown();
	535	}
	536	return retval;
	537	}
	538
	539	static void __exit exit_nfsd(void)
	540	{
	541	nfsd_export_shutdown();
	542	nfsd_cache_shutdown();
	543	remove_proc_entry("fs/nfs/exports", NULL);
	544	remove_proc_entry("fs/nfs", NULL);
	545	nfsd_stat_shutdown();
	546	nfsd_lockd_shutdown();
1da177e4	547	nfsd_idmap_shutdown();
1da177e4 LT	548	unregister_filesystem(&nfsd_fs_type);
	549	}
	550
	551	MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
	552	MODULE_LICENSE("GPL");
	553	module_init(init_nfsd)
	554	module_exit(exit_nfsd)