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

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Date:   Thu, 07 May 2020 09:44:13 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     Ilya Dryomov <idryomov@...il.com>
Cc:     ceph-devel@...r.kernel.org, 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 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?

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