1 /* file-mmu.c: ramfs MMU-based file operations
3 * Resizable simple ram filesystem for Linux.
5 * Copyright (C) 2000 Linus Torvalds.
8 * Usage limits added by David Gibson, Linuxcare Australia.
9 * This file is released under the GPL.
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.
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.
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.
29 #include <linux/ramfs.h>
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,
40 const struct file_operations ramfs_file_operations = {
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 = simple_sync_file,
47 .splice_read = generic_file_splice_read,
48 .splice_write = generic_file_splice_write,
49 .llseek = generic_file_llseek,
52 const struct inode_operations ramfs_file_inode_operations = {
53 .getattr = simple_getattr,