| 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 | |
| 33 | const struct file_operations ramfs_file_operations = { |
| 34 | .read = do_sync_read, |
| 35 | .aio_read = generic_file_aio_read, |
| 36 | .write = do_sync_write, |
| 37 | .aio_write = generic_file_aio_write, |
| 38 | .mmap = generic_file_mmap, |
| 39 | .fsync = noop_fsync, |
| 40 | .splice_read = generic_file_splice_read, |
| 41 | .splice_write = generic_file_splice_write, |
| 42 | .llseek = generic_file_llseek, |
| 43 | }; |
| 44 | |
| 45 | const struct inode_operations ramfs_file_inode_operations = { |
| 46 | .setattr = simple_setattr, |
| 47 | .getattr = simple_getattr, |
| 48 | }; |