/* * 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, };