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David Howells642fb4d2006-01-06 00:11:41 -08001/* 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
David Howells642fb4d2006-01-06 00:11:41 -080027#include <linux/fs.h>
David Howells642fb4d2006-01-06 00:11:41 -080028
29struct address_space_operations ramfs_aops = {
30 .readpage = simple_readpage,
31 .prepare_write = simple_prepare_write,
32 .commit_write = simple_commit_write
33};
34
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080035const struct file_operations ramfs_file_operations = {
David Howells642fb4d2006-01-06 00:11:41 -080036 .read = generic_file_read,
37 .write = generic_file_write,
38 .mmap = generic_file_mmap,
39 .fsync = simple_sync_file,
40 .sendfile = generic_file_sendfile,
41 .llseek = generic_file_llseek,
42};
43
44struct inode_operations ramfs_file_inode_operations = {
45 .getattr = simple_getattr,
46};