Re: [PATCH v1] exfat: move extend valid_size into ->page_mkwrite()

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

On Wed, Apr 03, 2024 at 07:34:08AM +0000, Yuezhang.Mo@xxxxxxxx wrote:
> +static int exfat_file_mmap(struct file *file, struct vm_area_struct *vma)
> +{
> +	struct address_space *mapping = file->f_mapping;
> +
> +	if (!mapping->a_ops->read_folio)
> +		return -ENOEXEC;

Why do you need this check?

> +	file_accessed(file);
> +	vma->vm_ops = &exfat_file_vm_ops;
> +	return 0;
>  }