| /* file-mmu.c: ramfs MMU-based file operations |
| * |
| * Resizable simple ram filesystem for Linux. |
| * |
| * Copyright (C) 2000 Linus Torvalds. |
| * 2000 Transmeta Corp. |
| * |
| * Usage limits added by David Gibson, Linuxcare Australia. |
| * This file is released under the GPL. |
| */ |
| |
| /* |
| * NOTE! This filesystem is probably most useful |
| * not as a real filesystem, but as an example of |
| * how virtual filesystems can be written. |
| * |
| * It doesn't get much simpler than this. Consider |
| * that this file implements the full semantics of |
| * a POSIX-compliant read-write filesystem. |
| * |
| * Note in particular how the filesystem does not |
| * need to implement any data structures of its own |
| * to keep track of the virtual data: using the VFS |
| * caches is sufficient. |
| */ |
| |
| #include <linux/fs.h> |
| #include <linux/mm.h> |
| |
| const struct address_space_operations ramfs_aops = { |
| .readpage = simple_readpage, |
| .prepare_write = simple_prepare_write, |
| .commit_write = simple_commit_write, |
| .set_page_dirty = __set_page_dirty_no_writeback, |
| }; |
| |
| const struct file_operations ramfs_file_operations = { |
| .read = do_sync_read, |
| .aio_read = generic_file_aio_read, |
| .write = do_sync_write, |
| .aio_write = generic_file_aio_write, |
| .mmap = generic_file_mmap, |
| .fsync = simple_sync_file, |
| .splice_read = generic_file_splice_read, |
| .llseek = generic_file_llseek, |
| }; |
| |
| const struct inode_operations ramfs_file_inode_operations = { |
| .getattr = simple_getattr, |
| }; |