/*
 * file.c - NTFS kernel file operations. Part of the Linux-NTFS project.
 *
 * Copyright (c) 2001 Anton Altaparmakov.
 *
 * This program/include file is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program/include file is distributed in the hope that it will be 
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty 
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program (in the main directory of the Linux-NTFS 
 * distribution in the file COPYING); if not, write to the Free Software
 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "ntfs.h"

/**
 * ntfs_file_open - called when an inode is about to be opened
 * @vi:		inode to be opened
 * @filp:	file structure describing the inode
 *
 * Limit file size to the page cache limit on architectures where unsigned long
 * is 32-bits. This is the most we can do for now without overflowing the page
 * cache page index. Doing it this way means we don't run into problems because
 * of existing too large files. It would be better to allow the user to read
 * the beginning of the file but I doubt very much anyone is going to hit this
 * check on a 32-bit architecture, so there is no point in adding the extra
 * complexity required to support this.
 *
 * On 64-bit architectures, the check is hopefully optimized away by the
 * compiler.
 *
 * After the check passes, just call generic_file_open() to do its work.
 */
static int ntfs_file_open(struct inode *vi, struct file *filp)
{
	if (sizeof(unsigned long) < 8) {
		if (vi->i_size > MAX_LFS_FILESIZE)
			return -EFBIG;
	}
	return generic_file_open(vi, filp);
}

struct file_operations ntfs_file_ops = {
	.llseek		= generic_file_llseek,	/* Seek inside file. */
	.read		= generic_file_read,	/* Read from file. */
#ifdef NTFS_RW
	.write		= generic_file_write,	/* Write to a file. */
#endif
	.mmap		= generic_file_mmap,	/* Mmap file. */
	.sendfile	= generic_file_sendfile,/* Zero-copy data send with the
						   data source being on the
						   ntfs partition. We don't
						   need to care about the data
						   destination. */
	.open		= ntfs_file_open,	/* Open file. */
};

struct inode_operations ntfs_file_inode_ops = {
#ifdef NTFS_RW
	.truncate	= ntfs_truncate,
	.setattr	= ntfs_setattr,
#endif
};

struct file_operations ntfs_empty_file_ops = {};

struct inode_operations ntfs_empty_inode_ops = {};