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#include <linux/sched.h>
31
32#include "internal.h"
33
34static unsigned long ramfs_mmu_get_unmapped_area(struct file *file,
35		unsigned long addr, unsigned long len, unsigned long pgoff,
36		unsigned long flags)
37{
38	return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
39}
40
41const struct file_operations ramfs_file_operations = {
42	.read_iter	= generic_file_read_iter,
43	.write_iter	= generic_file_write_iter,
 
 
44	.mmap		= generic_file_mmap,
45	.fsync		= noop_fsync,
46	.splice_read	= filemap_splice_read,
47	.splice_write	= iter_file_splice_write,
48	.llseek		= generic_file_llseek,
49	.get_unmapped_area	= ramfs_mmu_get_unmapped_area,
50};
51
52const struct inode_operations ramfs_file_inode_operations = {
53	.setattr	= simple_setattr,
54	.getattr	= simple_getattr,
55};

 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
33const 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
40const 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
52const struct inode_operations ramfs_file_inode_operations = {
53	.setattr	= simple_setattr,
54	.getattr	= simple_getattr,
55};