blob: b41a514b0976559a0f17f24bd98cdcea354b0c47 [file] [log] [blame]
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>
Dimitri Gorokhovik131612d2006-12-29 16:48:24 -080028#include <linux/mm.h>
David Howells642fb4d2006-01-06 00:11:41 -080029
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070030const struct address_space_operations ramfs_aops = {
David Howells642fb4d2006-01-06 00:11:41 -080031 .readpage = simple_readpage,
Nick Piggin800d15a2007-10-16 01:25:03 -070032 .write_begin = simple_write_begin,
33 .write_end = simple_write_end,
Ken Chen46626292007-02-10 01:43:17 -080034 .set_page_dirty = __set_page_dirty_no_writeback,
David Howells642fb4d2006-01-06 00:11:41 -080035};
36
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080037const struct file_operations ramfs_file_operations = {
Badari Pulavarty543ade12006-09-30 23:28:48 -070038 .read = do_sync_read,
39 .aio_read = generic_file_aio_read,
40 .write = do_sync_write,
41 .aio_write = generic_file_aio_write,
David Howells642fb4d2006-01-06 00:11:41 -080042 .mmap = generic_file_mmap,
43 .fsync = simple_sync_file,
Jens Axboe5ffc4ef2007-06-01 11:49:19 +020044 .splice_read = generic_file_splice_read,
David Howells642fb4d2006-01-06 00:11:41 -080045 .llseek = generic_file_llseek,
46};
47
Arjan van de Venc5ef1c42007-02-12 00:55:40 -080048const struct inode_operations ramfs_file_inode_operations = {
David Howells642fb4d2006-01-06 00:11:41 -080049 .getattr = simple_getattr,
50};