/* * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * Further, this software is distributed without any warranty that it is * free of the rightful claim of any third person regarding infringement * or the like.  Any license provided herein, whether implied or * otherwise, applies only to this software file.  Patent licenses, if * any, provided herein do not apply to combinations of this program with * other software, or any other product whatsoever. * * You should have received a copy of the GNU General Public License along * with this program; if not, write the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston MA 02111-1307, USA. * * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, * Mountain View, CA  94043, or: * * http://www.sgi.com * * For further information regarding this notice, see: * * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ */#include <linux/string.h>#include <linux/errno.h>#include <asm/uaccess.h>#include <xfs_types.h>#include "debug.h"#include "move.h"/* Read from kernel buffer at src to user/kernel buffer defined * by the uio structure. Advance the pointer in the uio struct * as we go. */intuio_read(caddr_t src, size_t len, struct uio *uio){	size_t	count;	if (!len || !uio->uio_resid)		return 0;	count = uio->uio_iov->iov_len;	if (!count)		return 0;	if (count > len)		count = len;	if (uio->uio_segflg == UIO_USERSPACE) {		if (copy_to_user(uio->uio_iov->iov_base, src, count))			return EFAULT;	} else {		ASSERT(uio->uio_segflg == UIO_SYSSPACE);		memcpy(uio->uio_iov->iov_base, src, count);	}	uio->uio_iov->iov_base = (void*)((char*)uio->uio_iov->iov_base + count);	uio->uio_iov->iov_len -= count;	uio->uio_offset += count;	uio->uio_resid -= count;	return 0;}