Re: [PATCH 2/9] proc: add a read_iter method to proc proc_ops

[Luis Chamberlain]

On Fri, Jun 26, 2020 at 09:58:29AM +0200, Christoph Hellwig wrote:
> diff --git a/fs/proc/inode.c b/fs/proc/inode.c
> index 28d6105e908e4c..fa86619cebc2be 100644
> --- a/fs/proc/inode.c
> +++ b/fs/proc/inode.c
> @@ -297,6 +297,29 @@ static loff_t proc_reg_llseek(struct file *file, loff_t 
> offset, int whence)
>       return rv;
>  }
>  
> +static ssize_t pde_read_iter(struct proc_dir_entry *pde, struct kiocb *iocb,
> +             struct iov_iter *iter)
> +{
> +     if (!pde->proc_ops->proc_read_iter)
> +             return -EINVAL;

When is this true?

> +     return pde->proc_ops->proc_read_iter(iocb, iter);
> +}
> +

  Luis