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642fb4d1 DH |
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 | ||
642fb4d1 | 27 | #include <linux/fs.h> |
131612df | 28 | #include <linux/mm.h> |
4488c59c AB |
29 | #include <linux/ramfs.h> |
30 | ||
31 | #include "internal.h" | |
642fb4d1 | 32 | |
f5e54d6e | 33 | const struct address_space_operations ramfs_aops = { |
642fb4d1 | 34 | .readpage = simple_readpage, |
800d15a5 NP |
35 | .write_begin = simple_write_begin, |
36 | .write_end = simple_write_end, | |
46626296 | 37 | .set_page_dirty = __set_page_dirty_no_writeback, |
642fb4d1 DH |
38 | }; |
39 | ||
4b6f5d20 | 40 | const struct file_operations ramfs_file_operations = { |
543ade1f BP |
41 | .read = do_sync_read, |
42 | .aio_read = generic_file_aio_read, | |
43 | .write = do_sync_write, | |
44 | .aio_write = generic_file_aio_write, | |
642fb4d1 | 45 | .mmap = generic_file_mmap, |
1b061d92 | 46 | .fsync = noop_fsync, |
5ffc4ef4 | 47 | .splice_read = generic_file_splice_read, |
8b3d3567 | 48 | .splice_write = generic_file_splice_write, |
642fb4d1 DH |
49 | .llseek = generic_file_llseek, |
50 | }; | |
51 | ||
c5ef1c42 | 52 | const struct inode_operations ramfs_file_inode_operations = { |
3322e79a | 53 | .setattr = simple_setattr, |
642fb4d1 DH |
54 | .getattr = simple_getattr, |
55 | }; |