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authorDavid Howells <dhowells@redhat.com>2006-01-06 03:11:41 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 11:33:32 -0500
commit642fb4d1f1dd2417aa69189fe5ceb81e4fb72900 (patch)
tree77427e3141a6160bfa09ed3af4428c6e874f3e0c /fs/ramfs/file-mmu.c
parent9f6d4b0c21a6894dad7665d3dda4174c7c120784 (diff)
[PATCH] NOMMU: Provide shared-writable mmap support on ramfs
The attached patch makes ramfs support shared-writable mmaps by: (1) Attempting to perform a contiguous block allocation to the requested size when truncate attempts to increase the file from zero size, such as happens when: fd = shm_open("/file/on/ramfs", ...): ftruncate(fd, size_requested); addr = mmap(NULL, subsize, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED, fd, offset); (2) Permitting any shared-writable mapping over any contiguous set of extant pages. get_unmapped_area() will return the address into the actual ramfs pages. The mapping may start anywhere and be of any size, but may not go over the end of file. Multiple mappings may overlap in any way. (3) Not permitting a file to be shrunk if it would truncate any shared mappings (private mappings are copied). Thus this patch provides support for POSIX shared memory on NOMMU kernels, with certain limitations such as there being a large enough block of pages available to support the allocation and it only working on directly mappable filesystems. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/ramfs/file-mmu.c')
-rw-r--r--fs/ramfs/file-mmu.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/fs/ramfs/file-mmu.c b/fs/ramfs/file-mmu.c
new file mode 100644
index 000000000000..2115383dcc8d
--- /dev/null
+++ b/fs/ramfs/file-mmu.c
@@ -0,0 +1,57 @@
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/module.h>
28#include <linux/fs.h>
29#include <linux/pagemap.h>
30#include <linux/highmem.h>
31#include <linux/init.h>
32#include <linux/string.h>
33#include <linux/smp_lock.h>
34#include <linux/backing-dev.h>
35#include <linux/ramfs.h>
36
37#include <asm/uaccess.h>
38#include "internal.h"
39
40struct address_space_operations ramfs_aops = {
41 .readpage = simple_readpage,
42 .prepare_write = simple_prepare_write,
43 .commit_write = simple_commit_write
44};
45
46struct file_operations ramfs_file_operations = {
47 .read = generic_file_read,
48 .write = generic_file_write,
49 .mmap = generic_file_mmap,
50 .fsync = simple_sync_file,
51 .sendfile = generic_file_sendfile,
52 .llseek = generic_file_llseek,
53};
54
55struct inode_operations ramfs_file_inode_operations = {
56 .getattr = simple_getattr,
57};