88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/*
|
|
* fs/sdcardfs/mmap.c
|
|
*
|
|
* Copyright (c) 2013 Samsung Electronics Co. Ltd
|
|
* Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
|
|
* Sunghwan Yun, Sungjong Seo
|
|
*
|
|
* This program has been developed as a stackable file system based on
|
|
* the WrapFS which written by
|
|
*
|
|
* Copyright (c) 1998-2011 Erez Zadok
|
|
* Copyright (c) 2009 Shrikar Archak
|
|
* Copyright (c) 2003-2011 Stony Brook University
|
|
* Copyright (c) 2003-2011 The Research Foundation of SUNY
|
|
*
|
|
* This file is dual licensed. It may be redistributed and/or modified
|
|
* under the terms of the Apache 2.0 License OR version 2 of the GNU
|
|
* General Public License.
|
|
*/
|
|
|
|
#include "sdcardfs.h"
|
|
|
|
static int sdcardfs_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
int err;
|
|
struct file *file;
|
|
const struct vm_operations_struct *lower_vm_ops;
|
|
|
|
file = (struct file *)vma->vm_private_data;
|
|
lower_vm_ops = SDCARDFS_F(file)->lower_vm_ops;
|
|
BUG_ON(!lower_vm_ops);
|
|
|
|
err = lower_vm_ops->fault(vma, vmf);
|
|
return err;
|
|
}
|
|
|
|
static void sdcardfs_vm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct file *file = (struct file *)vma->vm_private_data;
|
|
|
|
get_file(file);
|
|
}
|
|
|
|
static void sdcardfs_vm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct file *file = (struct file *)vma->vm_private_data;
|
|
|
|
fput(file);
|
|
}
|
|
|
|
static int sdcardfs_page_mkwrite(struct vm_area_struct *vma,
|
|
struct vm_fault *vmf)
|
|
{
|
|
int err = 0;
|
|
struct file *file;
|
|
const struct vm_operations_struct *lower_vm_ops;
|
|
|
|
file = (struct file *)vma->vm_private_data;
|
|
lower_vm_ops = SDCARDFS_F(file)->lower_vm_ops;
|
|
BUG_ON(!lower_vm_ops);
|
|
if (!lower_vm_ops->page_mkwrite)
|
|
goto out;
|
|
|
|
err = lower_vm_ops->page_mkwrite(vma, vmf);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static ssize_t sdcardfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
|
|
{
|
|
/*
|
|
* This function should never be called directly. We need it
|
|
* to exist, to get past a check in open_check_o_direct(),
|
|
* which is called from do_last().
|
|
*/
|
|
return -EINVAL;
|
|
}
|
|
|
|
const struct address_space_operations sdcardfs_aops = {
|
|
.direct_IO = sdcardfs_direct_IO,
|
|
};
|
|
|
|
const struct vm_operations_struct sdcardfs_vm_ops = {
|
|
.fault = sdcardfs_fault,
|
|
.page_mkwrite = sdcardfs_page_mkwrite,
|
|
.open = sdcardfs_vm_open,
|
|
.close = sdcardfs_vm_close,
|
|
};
|