vm_fault_t ext4_filemap_fault(struct vm_fault *vmf)
{
	struct inode *inode = file_inode(vmf->vma->vm_file);
	vm_fault_t ret;

	down_read(&EXT4_I(inode)->i_mmap_sem);
	ret = filemap_fault(vmf);
	up_read(&EXT4_I(inode)->i_mmap_sem);

	return ret;
}
vm_fault_t ext4_filemap_fault(struct vm_fault *vmf)
{
	struct inode *inode = file_inode(vmf->vma->vm_file);
	vm_fault_t ret;

	down_read(&EXT4_I(inode)->i_mmap_sem);
	ret = filemap_fault(vmf);
	up_read(&EXT4_I(inode)->i_mmap_sem);

	return ret;
}