linux-kernel - Re: [PATCH 3/9] VFS: Introduce a mount context

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Message-ID: <30059.1494403518@warthog.procyon.org.uk>
Date:   Wed, 10 May 2017 09:05:18 +0100
From:   David Howells <dhowells@...hat.com>
To:     Miklos Szeredi <mszeredi@...hat.com>
Cc:     dhowells@...hat.com, Jeff Layton <jlayton@...hat.com>,
        viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-nfs@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/9] VFS: Introduce a mount context

Miklos Szeredi <mszeredi@...hat.com> wrote:

> And the static string thing that David implemented is also a very good
> idea, IMO.

There is an issue with it: it's fine as long as you keep a ref on the module
that generated it or clear all strings as part of module removal (which the
mount context in this patchset does).  With the NFS mount context I did, I
have to keep a ref on the NFS protocol module as well as the NFS filesystem
module.

I'm tempted to make it conditionally copy the string using kvasprintf_const()
- which would also permit format substitution.

David