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

/*	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T	*/
/*	The copyright notice above does not evidence any   	*/
/*	actual or intended publication of such source code.	*/

/*
 * +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 * 		PROPRIETARY NOTICE (Combined)
 *
 * This source code is unpublished proprietary information
 * constituting, or derived under license from AT&T's UNIX(r) System V.
 * In addition, portions of such source code were derived from Berkeley
 * 4.3 BSD under license from the Regents of the University of
 * California.
 *
 *
 *
 * 		Copyright Notice
 *
 * Notice of copyright on this source code product does not indicate
 * publication.
 *
 * 	(c) 1986,1987,1988,1989,1993  Sun Microsystems, Inc
 * 	(c) 1983,1984,1985,1986,1987,1988,1989  AT&T.
 *		All rights reserved.
 *
 */

#pragma ident	"@(#)sysfs.c	1.2	96/09/29 SMI"	/* SVr4 1.42	*/

#include <sys/types.h>
#include <sys/t_lock.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/fstyp.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/cmn_err.h>
#include <sys/buf.h>
#include <sys/debug.h>
#include <sys/pathname.h>

/*
 * System call to map fstype numbers to names, and vice versa.
 */

static int sysfsind(char *);
static int sysfstyp(int, char *);

int
sysfs(int opcode, long a1, long a2)
{
	int error;

	switch (opcode) {
	case GETFSIND:
		error = sysfsind((char *)a1);
		break;
	case GETFSTYP:
		error = sysfstyp((int)a1, (char *)a2);
		break;
	case GETNFSTYP:
		/*
		 * Return number of fstypes configured in the system.
		 */
		return (nfstype - 1);
	default:
		error = set_errno(EINVAL);
	}

	return (error);
}

static int
sysfsind(char *fsname)
{
	/*
	 * Translate fs identifier to an index into the vfssw structure.
	 */
	struct vfssw *vswp;
	char fsbuf[FSTYPSZ];
	int retval;
	size_t len = 0;

	retval = copyinstr(fsname, fsbuf, FSTYPSZ, &len);
	if (retval == ENOENT)			/* XXX */
		retval = EINVAL;		/* XXX */
	if (len == 1)			/* Includes null byte */
		retval = EINVAL;
	if (retval)
		return (set_errno(retval));
	/*
	 * Search the vfssw table for the fs identifier
	 * and return the index.
	 */
	if ((vswp = vfs_getvfssw(fsbuf)) != NULL) {
		retval = vswp - vfssw;
		RUNLOCK_VFSSW();
		return (retval);
	}

	return (set_errno(EINVAL));
}

static int
sysfstyp(int index, char *cbuf)
{
	/*
	 * Translate fstype index into an fs identifier.
	 */
	char *src;
	struct vfssw *vswp;
	char *osrc;
	int error = 0;

	if (index <= 0 || index >= nfstype)
		return (set_errno(EINVAL));
	RLOCK_VFSSW();
	vswp = &vfssw[index];

	osrc = src = vswp->vsw_name;
	while (*src++)
		;

	if (copyout(osrc, cbuf, src - osrc))
		error = set_errno(EFAULT);
	RUNLOCK_VFSSW();
	return (error);
}
