/* 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> #include <linux/ramfs.h> #include "internal.h" const struct file_operations ramfs_file_operations = { .read = new_sync_read, .read_iter = generic_file_read_iter, .write = new_sync_write, .write_iter = generic_file_write_iter, .mmap = generic_file_mmap, .fsync = noop_fsync, .splice_read = generic_file_splice_read, .splice_write = iter_file_splice_write, .llseek = generic_file_llseek, }; const struct inode_operations ramfs_file_inode_operations = { .setattr = simple_setattr, .getattr = simple_getattr, };