1/* file-mmu.c: ramfs MMU-based file operations
2 *
3 * Resizable simple ram filesystem for Linux.
4 *
5 * Copyright (C) 2000 Linus Torvalds.
6 *               2000 Transmeta Corp.
7 *
8 * Usage limits added by David Gibson, Linuxcare Australia.
9 * This file is released under the GPL.
10 */
11
12/*
13 * NOTE! This filesystem is probably most useful
14 * not as a real filesystem, but as an example of
15 * how virtual filesystems can be written.
16 *
17 * It doesn't get much simpler than this. Consider
18 * that this file implements the full semantics of
19 * a POSIX-compliant read-write filesystem.
20 *
21 * Note in particular how the filesystem does not
22 * need to implement any data structures of its own
23 * to keep track of the virtual data: using the VFS
24 * caches is sufficient.
25 */
26
27#include <linux/fs.h>
28#include <linux/mm.h>
29
30const struct address_space_operations ramfs_aops = {
31	.readpage	= simple_readpage,
32	.prepare_write	= simple_prepare_write,
33	.commit_write	= simple_commit_write,
34	.set_page_dirty = __set_page_dirty_no_writeback,
35};
36
37const struct file_operations ramfs_file_operations = {
38	.read		= do_sync_read,
39	.aio_read	= generic_file_aio_read,
40	.write		= do_sync_write,
41	.aio_write	= generic_file_aio_write,
42	.mmap		= generic_file_mmap,
43	.fsync		= simple_sync_file,
44	.sendfile	= generic_file_sendfile,
45	.llseek		= generic_file_llseek,
46};
47
48const struct inode_operations ramfs_file_inode_operations = {
49	.getattr	= simple_getattr,
50};
51