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 #include <linux/ramfs.h>
30 
31 #include "internal.h"
32 
33 const struct address_space_operations ramfs_aops = {
34 	.readpage	= simple_readpage,
35 	.write_begin	= simple_write_begin,
36 	.write_end	= simple_write_end,
37 	.set_page_dirty = __set_page_dirty_no_writeback,
38 };
39 
40 const struct file_operations ramfs_file_operations = {
41 	.read		= do_sync_read,
42 	.aio_read	= generic_file_aio_read,
43 	.write		= do_sync_write,
44 	.aio_write	= generic_file_aio_write,
45 	.mmap		= generic_file_mmap,
46 	.fsync		= noop_fsync,
47 	.splice_read	= generic_file_splice_read,
48 	.splice_write	= generic_file_splice_write,
49 	.llseek		= generic_file_llseek,
50 };
51 
52 const struct inode_operations ramfs_file_inode_operations = {
53 	.setattr	= simple_setattr,
54 	.getattr	= simple_getattr,
55 };
56