/* 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 <linux/sched.h>

#include "internal.h"

static unsigned long ramfs_mmu_get_unmapped_area(struct file *file,
                unsigned long addr, unsigned long len, unsigned long pgoff,
                unsigned long flags)
{
        return mm_get_unmapped_area(file, addr, len, pgoff, flags);
}

const struct file_operations ramfs_file_operations = {
        .read_iter      = generic_file_read_iter,
        .write_iter     = generic_file_write_iter,
        .mmap_prepare   = generic_file_mmap_prepare,
        .fsync          = noop_fsync,
        .splice_read    = filemap_splice_read,
        .splice_write   = iter_file_splice_write,
        .llseek         = generic_file_llseek,
        .get_unmapped_area      = ramfs_mmu_get_unmapped_area,
};

const struct inode_operations ramfs_file_inode_operations = {
        .setattr        = simple_setattr,
        .getattr        = simple_getattr,
};