/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
/*        All Rights Reserved   */

/*
 * Portions of this source code were derived from Berkeley 4.3 BSD
 * under license from the Regents of the University of California.
 */

#include <sys/types.h>
#include <sys/t_lock.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/user.h>
#include <sys/fstyp.h>
#include <sys/kmem.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/vfs.h>
#include <sys/cred.h>
#include <sys/vnode.h>
#include <sys/dnlc.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/cmn_err.h>
#include <sys/swap.h>
#include <sys/debug.h>
#include <sys/pathname.h>
#include <sys/cladm.h>

/*
 * System calls.
 */

/*
 * "struct mounta" defined in sys/vfs.h.
 */

/* ARGSUSED */
int
mount(long *lp, rval_t *rp)
{
        vnode_t *vp = NULL;
        struct vfs *vfsp;       /* dummy argument */
        int error;
        struct mounta *uap;
#if defined(_LP64)
        struct mounta native;

        /*
         * Make a struct mounta if we are DATAMODEL_LP64
         */
        uap = &native;
        uap->spec = (char *)*lp++;
        uap->dir = (char *)*lp++;
        uap->flags = (int)*lp++;
        uap->fstype = (char *)*lp++;
        uap->dataptr = (char *)*lp++;
        uap->datalen = (int)*lp++;
        uap->optptr = (char *)*lp++;
        uap->optlen = (int)*lp++;
#else   /* !defined(_LP64) */
        /*
         * 32 bit kernels can take a shortcut and just cast
         * the args array to the structure.
         */
        uap = (struct mounta *)lp;
#endif  /* _LP64 */
        /*
         * Resolve second path name (mount point).
         */
        if (error = lookupname(uap->dir, UIO_USERSPACE, FOLLOW, NULLVPP, &vp))
                return (set_errno(error));

        /*
         * Some mount flags are disallowed through the system call interface.
         */
        uap->flags &= MS_MASK;

        if ((vp->v_flag & VPXFS) && ((uap->flags & MS_GLOBAL) != MS_GLOBAL)) {
                /*
                 * Clustering: if we're doing a mount onto the global
                 * namespace, and the mount is not a global mount, return
                 * an error.
                 */
                error = ENOTSUP;
        } else if (uap->flags & MS_GLOBAL) {
                /*
                 * Clustering: global mount specified.
                 */
                if ((cluster_bootflags & CLUSTER_BOOTED) == 0) {
                        /*
                         * If we're not booted as a cluster,
                         * global mounts are not allowed.
                         */
                        error = ENOTSUP;
                } else {
                        error = domount("pxfs", uap, vp, CRED(), &vfsp);
                        if (!error)
                                VFS_RELE(vfsp);
                }
        } else {
                error = domount(NULL, uap, vp, CRED(), &vfsp);
                if (!error)
                        VFS_RELE(vfsp);
        }
        VN_RELE(vp);
        rp->r_val2 = error;
        return (error ? set_errno(error) : 0);
}