linux-kernel - Re: [PATCH 1/2] quota: Add mountpath based quota support

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Message-ID: <20210212083835.GF19583@pengutronix.de>
Date:   Fri, 12 Feb 2021 09:38:35 +0100
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, Jan Kara <jack@...e.com>,
        Richard Weinberger <richard@....at>
Subject: Re: [PATCH 1/2] quota: Add mountpath based quota support

On Thu, Feb 11, 2021 at 03:38:13PM +0000, Christoph Hellwig wrote:
> > +	if (!mountpoint)
> > +		return -ENODEV;
> > +
> > +	ret = user_path_at(AT_FDCWD, mountpoint,
> > +			     LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT, &mountpath);
> 
> user_path_at handles an empty path, although you'll get EFAULT instead.
> Do we care about the -ENODEV here?

The quotactl manpage documents EFAULT as error code for invalid addr or
special argument, so we really should return -EFAULT here.

Existing quotactl gets this wrong as well:

	if (!special) {
		if (cmds == Q_SYNC)
			return quota_sync_all(type);
		return -ENODEV;
	}

Should we fix this or is there userspace code that is confused by a changed
return value?

Sascha

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