[PATCH] ceph: demote quotarealm lookup warning to a debug message

[PATCH] ceph: demote quotarealm lookup warning to a debug message

[Luis Henriques]

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@suse.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;

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

[Jeff Layton]

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@suse.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;
> 

Merged into testing.

Thanks Luis!
-- 
Jeff Layton <jlayton@kernel.org>

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

[Jeff Layton]

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@suse.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@kernel.org>

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

[Ilya Dryomov]

On Thu, May 7, 2020 at 3:44 PM Jeff Layton <jlayton@kernel.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@suse.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