linux-kernel - Re: [PATCH] ceph: demote quotarealm lookup warning to a debug message

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Message-ID: <CAOi1vP8oO156ZH0Ge3d5V0fu+NTW6LO12bxgy1h-W5X4+9zN=w@mail.gmail.com>
Date:   Thu, 7 May 2020 18:26:03 +0200
From:   Ilya Dryomov <idryomov@...il.com>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Ceph Development <ceph-devel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Gregory Farnum <gfarnum@...hat.com>,
        Luis Henriques <lhenriques@...e.com>
Subject: Re: [PATCH] ceph: demote quotarealm lookup warning to a debug message

On Thu, May 7, 2020 at 3:44 PM Jeff Layton <jlayton@...nel.org> wrote:
>
> On Tue, 2020-05-05 at 13:59 +0100, Luis Henriques wrote:
> > A misconfigured cephx can easily result in having the kernel client
> > flooding the logs with:
> >
> >   ceph: Can't lookup inode 1 (err: -13)
> >
> > Change his message to debug level.
> >
> > Link: https://tracker.ceph.com/issues/44546
> > Signed-off-by: Luis Henriques <lhenriques@...e.com>
> > ---
> > Hi!
> >
> > This patch should fix some harmless warnings when using cephx to restrict
> > users access to certain filesystem paths.  I've added a comment to the
> > tracker where removing this warning could result (unlikely, IMHO!) in an
> > admin to miss not-so-harmless bogus configurations.
> >
> > Cheers,
> > --
> > Luís
> >
> >  fs/ceph/quota.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c
> > index de56dee60540..19507e2fdb57 100644
> > --- a/fs/ceph/quota.c
> > +++ b/fs/ceph/quota.c
> > @@ -159,8 +159,8 @@ static struct inode *lookup_quotarealm_inode(struct ceph_mds_client *mdsc,
> >       }
> >
> >       if (IS_ERR(in)) {
> > -             pr_warn("Can't lookup inode %llx (err: %ld)\n",
> > -                     realm->ino, PTR_ERR(in));
> > +             dout("Can't lookup inode %llx (err: %ld)\n",
> > +                  realm->ino, PTR_ERR(in));
> >               qri->timeout = jiffies + msecs_to_jiffies(60 * 1000); /* XXX */
> >       } else {
> >               qri->timeout = 0;
> >
>
> Ilya,
>
> We've had a number of reports where people get a ton of kernel log spam
> when they hit this problem. I think we probably ought to mark this patch
> for stable and go ahead and send it to Linus for v5.7 -- any objection?

Sure, I'll queue it up.

Thanks,

                Ilya