/*
* 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 */
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)
