linux-kernel - Re: [PATCH 8/9] fs: don't allow kernel reads and writes without iter ops

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Message-ID: <20200626135147.GB25039@casper.infradead.org>
Date:   Fri, 26 Jun 2020 14:51:47 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 8/9] fs: don't allow kernel reads and writes without iter
 ops

On Fri, Jun 26, 2020 at 09:58:35AM +0200, Christoph Hellwig wrote:
> +static void warn_unsupported(struct file *file, const char *op)
> +{
> +	char pathname[128], *path;
> +
> +	path = file_path(file, pathname, sizeof(pathname));
> +	if (IS_ERR(path))
> +		path = "(unknown)";
> +	pr_warn_ratelimited(
> +		"kernel %s not supported for file %s (pid: %d comm: %.20s)\n",
> +		op, path, current->pid, current->comm);
> +}
> +

how about just:

	pr_warn_ratelimited(
		"kernel %s not supported for file %pD4 (pid: %d comm: %.20s)\n",
			op, file, current->pid, current->comm);

also, is the pid really that interesting?