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/*

 *      fs/nfsctl.c

 *

 *      This should eventually move to userland.

 *

 */

#include <linux/types.h>

#include <linux/file.h>

#include <linux/fs.h>

#include <linux/sunrpc/svc.h>

#include <linux/nfsd/nfsd.h>

#include <linux/nfsd/syscall.h>

#include <linux/linkage.h>

#include <linux/namei.h>

#include <linux/mount.h>

#include <linux/syscalls.h>

#include <asm/uaccess.h>

/*

 * open a file on nfsd fs

 */

static struct file *do_open(char *name, int flags)

{

        struct nameidata nd;

        struct vfsmount *mnt;

        int error;

        mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);

        if (IS_ERR(mnt))

                return (struct file *)mnt;

        error = vfs_path_lookup(mnt->mnt_root, mnt, name, 0, &nd);

        mntput(mnt);    /* drop do_kern_mount reference */

        if (error)

                return ERR_PTR(error);

        if (flags == O_RDWR)

                error = may_open(&nd,MAY_READ|MAY_WRITE,FMODE_READ|FMODE_WRITE);

        else

                error = may_open(&nd, MAY_WRITE, FMODE_WRITE);

        if (!error)

                return dentry_open(nd.dentry, nd.mnt, flags);

        path_release(&nd);

        return ERR_PTR(error);

}

static struct {

        char *name; int wsize; int rsize;

} map[] = {

        [NFSCTL_SVC] = {

                .name   = ".svc",

                .wsize  = sizeof(struct nfsctl_svc)

        },

        [NFSCTL_ADDCLIENT] = {

                .name   = ".add",

                .wsize  = sizeof(struct nfsctl_client)

        },

        [NFSCTL_DELCLIENT] = {

                .name   = ".del",

                .wsize  = sizeof(struct nfsctl_client)

        },

        [NFSCTL_EXPORT] = {

                .name   = ".export",

                .wsize  = sizeof(struct nfsctl_export)

        },

        [NFSCTL_UNEXPORT] = {

                .name   = ".unexport",

                .wsize  = sizeof(struct nfsctl_export)

        },

        [NFSCTL_GETFD] = {

                .name   = ".getfd",

                .wsize  = sizeof(struct nfsctl_fdparm),

                .rsize  = NFS_FHSIZE

        },

        [NFSCTL_GETFS] = {

                .name   = ".getfs",

                .wsize  = sizeof(struct nfsctl_fsparm),

                .rsize  = sizeof(struct knfsd_fh)

        },

};

long

asmlinkage sys_nfsservctl(int cmd, struct nfsctl_arg __user *arg, void __user *res)

{

        struct file *file;

        void __user *p = &arg->u;

        int version;

        int err;

        if (copy_from_user(&version, &arg->ca_version, sizeof(int)))

                return -EFAULT;

        if (version != NFSCTL_VERSION)

                return -EINVAL;

        if (cmd < 0 || cmd >= ARRAY_SIZE(map) || !map[cmd].name)

                return -EINVAL;

        file = do_open(map[cmd].name, map[cmd].rsize ? O_RDWR : O_WRONLY);

        if (IS_ERR(file))

                return PTR_ERR(file);

        err = file->f_op->write(file, p, map[cmd].wsize, &file->f_pos);

        if (err >= 0 && map[cmd].rsize)

                err = file->f_op->read(file, res, map[cmd].rsize, &file->f_pos);

        if (err >= 0)

                err = 0;

        fput(file);

        return err;

}