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