linux-kernel - Re: [PATCH] debugfs show actual source in /proc/mounts

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Message-ID: <alpine.WNT.2.20.2408181925400.3116@CLUIJ>
Date: Sun, 18 Aug 2024 19:29:00 -0600 (Mountain Daylight Time)
From: Marc Aurèle La France <tsi@...oix.net>
To: Eric Sandeen <sandeen@...hat.com>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Christian Brauner <brauner@...nel.org>,
        David Howells <dhowells@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] debugfs show actual source in /proc/mounts

On Tue, 2024-Aug-13, Eric Sandeen wrote:
> On 8/13/24 4:54 AM, Greg Kroah-Hartman wrote:
>> On Sat, Aug 10, 2024 at 01:25:27PM -0600, Marc Aurèle La France wrote:
>>> After its conversion to the new mount API, debugfs displays "none" in
>>> /proc/mounts instead of the actual source.  Fix this by recognising its
>>> "source" mount option.

>>> Signed-off-by: Marc Aurèle La France <tsi@...oix.net>
>>> Fixes: a20971c18752 ("vfs: Convert debugfs to use the new mount API")
>>> Cc: stable@...r.kernel.org # 6.10.x: 9f111059e725: fs_parse: add uid & gid option option parsing helpers
>>> Cc: stable@...r.kernel.org # 6.10.x: 49abee5991e1: debugfs: Convert to new uid/gid option parsing helpers

>> As this came from a fs tree, I'll let the vfs maintainer take it if they
>> think it is ok as I know nothing about the fs_parse stuff at the moment,
>> sorry.

> Hm, I guess this is OK, though it seems a little unexpected for debugfs
> to have to parse the trivial internal "source" option.

> This actually worked OK until

> 0c07c273a5fe debugfs: continue to ignore unknown mount options

> but after that commit, debugfs claims to parse "source" successfully even
> though it has not. So really, it Fixes: that commit, not the original
> conversion.

> I'm not sure of a better approach offhand, but maybe a comment about why
> Opt_source exists in debugfs would help future readers?

Meaning what?  I'd say you're in a better position to explain why debugfs
shouldn't follow other fs's in this regard.

Marc.