2 * file.c - NTFS kernel file operations. Part of the Linux-NTFS project.
4 * Copyright (c) 2001 Anton Altaparmakov.
6 * This program/include file is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program/include file is distributed in the hope that it will be
12 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program (in the main directory of the Linux-NTFS
18 * distribution in the file COPYING); if not, write to the Free Software
19 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 * ntfs_file_open - called when an inode is about to be opened
26 * @vi: inode to be opened
27 * @filp: file structure describing the inode
29 * Limit file size to the page cache limit on architectures where unsigned long
30 * is 32-bits. This is the most we can do for now without overflowing the page
31 * cache page index. Doing it this way means we don't run into problems because
32 * of existing too large files. It would be better to allow the user to read
33 * the beginning of the file but I doubt very much anyone is going to hit this
34 * check on a 32-bit architecture, so there is no point in adding the extra
35 * complexity required to support this.
37 * On 64-bit architectures, the check is hopefully optimized away by the
40 * After the check passes, just call generic_file_open() to do its work.
42 static int ntfs_file_open(struct inode *vi, struct file *filp)
44 if (sizeof(unsigned long) < 8) {
45 if (vi->i_size > MAX_LFS_FILESIZE)
48 return generic_file_open(vi, filp);
51 struct file_operations ntfs_file_ops = {
52 .llseek = generic_file_llseek, /* Seek inside file. */
53 .read = generic_file_read, /* Read from file. */
55 .write = generic_file_write, /* Write to a file. */
57 .mmap = generic_file_mmap, /* Mmap file. */
58 .sendfile = generic_file_sendfile,/* Zero-copy data send with the
59 data source being on the
60 ntfs partition. We don't
61 need to care about the data
63 .open = ntfs_file_open, /* Open file. */
66 struct inode_operations ntfs_file_inode_ops = {
68 .truncate = ntfs_truncate,
69 .setattr = ntfs_setattr,
73 struct file_operations ntfs_empty_file_ops = {};
75 struct inode_operations ntfs_empty_inode_ops = {};