linux-kernel - Re: [PATCH v2 1/2] fs: warn about impending deprecation of mandatory locks

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Date:   Fri, 20 Aug 2021 11:50:51 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     David Laight <David.Laight@...LAB.COM>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "ebiederm@...ssion.com" <ebiederm@...ssion.com>,
        "david@...hat.com" <david@...hat.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "v9fs-developer@...ts.sourceforge.net" 
        <v9fs-developer@...ts.sourceforge.net>,
        "linux-afs@...ts.infradead.org" <linux-afs@...ts.infradead.org>,
        "cluster-devel@...hat.com" <cluster-devel@...hat.com>,
        "ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "luto@...nel.org" <luto@...nel.org>,
        "bfields@...ldses.org" <bfields@...ldses.org>,
        "w@....eu" <w@....eu>, "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] fs: warn about impending deprecation of
 mandatory locks

On Fri, 2021-08-20 at 15:49 +0000, David Laight wrote:
> From: Jeff Layton
> > Sent: 20 August 2021 14:57
> > 
> > We've had CONFIG_MANDATORY_FILE_LOCKING since 2015 and a lot of distros
> > have disabled it. Warn the stragglers that still use "-o mand" that
> > we'll be dropping support for that mount option.
> > 
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Jeff Layton <jlayton@...nel.org>
> > ---
> >  fs/namespace.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/fs/namespace.c b/fs/namespace.c
> > index ab4174a3c802..ffab0bb1e649 100644
> > --- a/fs/namespace.c
> > +++ b/fs/namespace.c
> > @@ -1716,8 +1716,16 @@ static inline bool may_mount(void)
> >  }
> > 
> >  #ifdef	CONFIG_MANDATORY_FILE_LOCKING
> > +static bool warned_mand;
> >  static inline bool may_mandlock(void)
> >  {
> > +	if (!warned_mand) {
> > +		warned_mand = true;
> > +		pr_warn("======================================================\n");
> > +		pr_warn("WARNING: the mand mount option is being deprecated and\n");
> > +		pr_warn("         will be removed in v5.15!\n");
> > +		pr_warn("======================================================\n");
> > +	}
> >  	return capable(CAP_SYS_ADMIN);
> >  }
> 
> If that is called more than once you don't want the 'inline'.
> I doubt it matters is not inlined - hardly a hot path.
> 
> 	David
> 
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)
> 

ACK. Of course. That really needs to not be inline. I'll fix that up in
my tree.

Thanks!
-- 
Jeff Layton <jlayton@...nel.org>