1 files changed, 438 insertions, 0 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
new file mode 100644
index 000000000000..161afdcb8f7d
--- /dev/null
+++ b/fs/nfsd/nfsctl.c
@@ -0,0 +1,438 @@
+/*
+ * 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)