[PATCH] nfsd: don't create nfsv4recoverydir in nfsdfs when not used.

[PATCH] nfsd: don't create nfsv4recoverydir in nfsdfs when not used.

[NeilBrown]

When CONFIG_NFSD_LEGACY_CLIENT_TRACKING is not set, the virtual file
  /proc/fs/nfsd/nfsv4recoverydir
is created but responds EINVAL to any access.
This is not useful, is somewhat surprising, and it causes ltp to
complain.

The only known user of this file is in nfs-utils, which handles
non-existence and read-failure equally well.  So there is nothing to
gain from leaving the file present but inaccessible.

So this patch removes the file when its content is not available - i.e.
when that config option is not selected.

Also remove the #ifdef which hides some of the enum values when
CONFIG_NFSD_V$ not selection.  simple_fill_super() quietly ignores array
entries that are not present, so having slots in the array that don't
get used is perfectly acceptable.  So there is no value in this #ifdef.

Reported-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Fixes: 74fd48739d04 ("nfsd: new Kconfig option for legacy client tracking")
Signed-off-by: NeilBrown <neilb@suse.de>
---
 fs/nfsd/nfsctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 93c87587e646..340c5d61f199 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -48,12 +48,10 @@ enum {
 	NFSD_MaxBlkSize,
 	NFSD_MaxConnections,
 	NFSD_Filecache,
-#ifdef CONFIG_NFSD_V4
 	NFSD_Leasetime,
 	NFSD_Gracetime,
 	NFSD_RecoveryDir,
 	NFSD_V4EndGrace,
-#endif
 	NFSD_MaxReserved
 };
 
@@ -1360,7 +1358,9 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
 #ifdef CONFIG_NFSD_V4
 		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 		[NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
+#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
 		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
+#endif
 		[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
 #endif
 		/* last one */ {""}
-- 
2.44.0

Re: [PATCH] nfsd: don't create nfsv4recoverydir in nfsdfs when not used.

[Petr Vorel]

Hi Neil, all,

> When CONFIG_NFSD_LEGACY_CLIENT_TRACKING is not set, the virtual file
>   /proc/fs/nfsd/nfsv4recoverydir
> is created but responds EINVAL to any access.
> This is not useful, is somewhat surprising, and it causes ltp to
> complain.

> The only known user of this file is in nfs-utils, which handles
> non-existence and read-failure equally well.  So there is nothing to
> gain from leaving the file present but inaccessible.

> So this patch removes the file when its content is not available - i.e.
> when that config option is not selected.

> Also remove the #ifdef which hides some of the enum values when
> CONFIG_NFSD_V$ not selection.  simple_fill_super() quietly ignores array
> entries that are not present, so having slots in the array that don't
> get used is perfectly acceptable.  So there is no value in this #ifdef.

> Reported-by: Petr Vorel <pvorel@suse.cz>
> Reviewed-by: Jeff Layton <jlayton@kernel.org>
> Fixes: 74fd48739d04 ("nfsd: new Kconfig option for legacy client tracking")
> Signed-off-by: NeilBrown <neilb@suse.de>
> ---
>  fs/nfsd/nfsctl.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

> diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> index 93c87587e646..340c5d61f199 100644
> --- a/fs/nfsd/nfsctl.c
> +++ b/fs/nfsd/nfsctl.c
> @@ -48,12 +48,10 @@ enum {
>  	NFSD_MaxBlkSize,
>  	NFSD_MaxConnections,
>  	NFSD_Filecache,
> -#ifdef CONFIG_NFSD_V4
>  	NFSD_Leasetime,
>  	NFSD_Gracetime,
>  	NFSD_RecoveryDir,
>  	NFSD_V4EndGrace,
> -#endif
>  	NFSD_MaxReserved
>  };

> @@ -1360,7 +1358,9 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
>  #ifdef CONFIG_NFSD_V4
>  		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
>  		[NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
> +#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
>  		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
> +#endif

LGTM.

Reviewed-by: Petr Vorel <pvorel@suse.cz>

Kind regards,
Petr

>  		[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
>  #endif
>  		/* last one */ {""}

Re: [PATCH] nfsd: don't create nfsv4recoverydir in nfsdfs when not used.

[Chuck Lever]

On Wed, Apr 17, 2024 at 07:25:16AM +0200, Petr Vorel wrote:
> Hi Neil, all,
> 
> > When CONFIG_NFSD_LEGACY_CLIENT_TRACKING is not set, the virtual file
> >   /proc/fs/nfsd/nfsv4recoverydir
> > is created but responds EINVAL to any access.
> > This is not useful, is somewhat surprising, and it causes ltp to
> > complain.
> 
> > The only known user of this file is in nfs-utils, which handles
> > non-existence and read-failure equally well.  So there is nothing to
> > gain from leaving the file present but inaccessible.
> 
> > So this patch removes the file when its content is not available - i.e.
> > when that config option is not selected.
> 
> > Also remove the #ifdef which hides some of the enum values when
> > CONFIG_NFSD_V$ not selection.  simple_fill_super() quietly ignores array
> > entries that are not present, so having slots in the array that don't
> > get used is perfectly acceptable.  So there is no value in this #ifdef.
> 
> > Reported-by: Petr Vorel <pvorel@suse.cz>
> > Reviewed-by: Jeff Layton <jlayton@kernel.org>
> > Fixes: 74fd48739d04 ("nfsd: new Kconfig option for legacy client tracking")
> > Signed-off-by: NeilBrown <neilb@suse.de>
> > ---
> >  fs/nfsd/nfsctl.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> > index 93c87587e646..340c5d61f199 100644
> > --- a/fs/nfsd/nfsctl.c
> > +++ b/fs/nfsd/nfsctl.c
> > @@ -48,12 +48,10 @@ enum {
> >  	NFSD_MaxBlkSize,
> >  	NFSD_MaxConnections,
> >  	NFSD_Filecache,
> > -#ifdef CONFIG_NFSD_V4
> >  	NFSD_Leasetime,
> >  	NFSD_Gracetime,
> >  	NFSD_RecoveryDir,
> >  	NFSD_V4EndGrace,
> > -#endif
> >  	NFSD_MaxReserved
> >  };
> 
> > @@ -1360,7 +1358,9 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
> >  #ifdef CONFIG_NFSD_V4
> >  		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
> >  		[NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
> > +#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
> >  		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
> > +#endif
> 
> LGTM.
> 
> Reviewed-by: Petr Vorel <pvorel@suse.cz>
> 
> Kind regards,
> Petr
> 
> >  		[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
> >  #endif
> >  		/* last one */ {""}

Thanks to you both! Applied to nfsd-next (for v6.10), unless you'd
like this to go in sooner.

-- 
Chuck Lever

Re: [PATCH] nfsd: don't create nfsv4recoverydir in nfsdfs when not used.

[Petr Vorel]

> On Wed, Apr 17, 2024 at 07:25:16AM +0200, Petr Vorel wrote:
> > Hi Neil, all,

> > > When CONFIG_NFSD_LEGACY_CLIENT_TRACKING is not set, the virtual file
> > >   /proc/fs/nfsd/nfsv4recoverydir
> > > is created but responds EINVAL to any access.
> > > This is not useful, is somewhat surprising, and it causes ltp to
> > > complain.

> > > The only known user of this file is in nfs-utils, which handles
> > > non-existence and read-failure equally well.  So there is nothing to
> > > gain from leaving the file present but inaccessible.

> > > So this patch removes the file when its content is not available - i.e.
> > > when that config option is not selected.

> > > Also remove the #ifdef which hides some of the enum values when
> > > CONFIG_NFSD_V$ not selection.  simple_fill_super() quietly ignores array
> > > entries that are not present, so having slots in the array that don't
> > > get used is perfectly acceptable.  So there is no value in this #ifdef.

> > > Reported-by: Petr Vorel <pvorel@suse.cz>
> > > Reviewed-by: Jeff Layton <jlayton@kernel.org>
> > > Fixes: 74fd48739d04 ("nfsd: new Kconfig option for legacy client tracking")
> > > Signed-off-by: NeilBrown <neilb@suse.de>
> > > ---
> > >  fs/nfsd/nfsctl.c | 4 ++--
> > >  1 file changed, 2 insertions(+), 2 deletions(-)

> > > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> > > index 93c87587e646..340c5d61f199 100644
> > > --- a/fs/nfsd/nfsctl.c
> > > +++ b/fs/nfsd/nfsctl.c
> > > @@ -48,12 +48,10 @@ enum {
> > >  	NFSD_MaxBlkSize,
> > >  	NFSD_MaxConnections,
> > >  	NFSD_Filecache,
> > > -#ifdef CONFIG_NFSD_V4
> > >  	NFSD_Leasetime,
> > >  	NFSD_Gracetime,
> > >  	NFSD_RecoveryDir,
> > >  	NFSD_V4EndGrace,
> > > -#endif
> > >  	NFSD_MaxReserved
> > >  };

> > > @@ -1360,7 +1358,9 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
> > >  #ifdef CONFIG_NFSD_V4
> > >  		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
> > >  		[NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
> > > +#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
> > >  		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
> > > +#endif

> > LGTM.

> > Reviewed-by: Petr Vorel <pvorel@suse.cz>

> > Kind regards,
> > Petr

> > >  		[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
> > >  #endif
> > >  		/* last one */ {""}

> Thanks to you both! Applied to nfsd-next (for v6.10), unless you'd
> like this to go in sooner.

OK for me, I guess LTP testers can wait.

Kind regards,
Petr

Re: [PATCH] nfsd: don't create nfsv4recoverydir in nfsdfs when not used.

[Petr Vorel]

> On Wed, Apr 17, 2024 at 07:25:16AM +0200, Petr Vorel wrote:
> > Hi Neil, all,

> > > When CONFIG_NFSD_LEGACY_CLIENT_TRACKING is not set, the virtual file
> > >   /proc/fs/nfsd/nfsv4recoverydir
> > > is created but responds EINVAL to any access.
> > > This is not useful, is somewhat surprising, and it causes ltp to
> > > complain.

> > > The only known user of this file is in nfs-utils, which handles
> > > non-existence and read-failure equally well.  So there is nothing to
> > > gain from leaving the file present but inaccessible.

> > > So this patch removes the file when its content is not available - i.e.
> > > when that config option is not selected.

> > > Also remove the #ifdef which hides some of the enum values when
> > > CONFIG_NFSD_V$ not selection.  simple_fill_super() quietly ignores array
> > > entries that are not present, so having slots in the array that don't
> > > get used is perfectly acceptable.  So there is no value in this #ifdef.

> > > Reported-by: Petr Vorel <pvorel@suse.cz>
> > > Reviewed-by: Jeff Layton <jlayton@kernel.org>
> > > Fixes: 74fd48739d04 ("nfsd: new Kconfig option for legacy client tracking")
> > > Signed-off-by: NeilBrown <neilb@suse.de>
> > > ---
> > >  fs/nfsd/nfsctl.c | 4 ++--
> > >  1 file changed, 2 insertions(+), 2 deletions(-)

> > > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> > > index 93c87587e646..340c5d61f199 100644
> > > --- a/fs/nfsd/nfsctl.c
> > > +++ b/fs/nfsd/nfsctl.c
> > > @@ -48,12 +48,10 @@ enum {
> > >  	NFSD_MaxBlkSize,
> > >  	NFSD_MaxConnections,
> > >  	NFSD_Filecache,
> > > -#ifdef CONFIG_NFSD_V4
> > >  	NFSD_Leasetime,
> > >  	NFSD_Gracetime,
> > >  	NFSD_RecoveryDir,
> > >  	NFSD_V4EndGrace,
> > > -#endif
> > >  	NFSD_MaxReserved
> > >  };

> > > @@ -1360,7 +1358,9 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
> > >  #ifdef CONFIG_NFSD_V4
> > >  		[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
> > >  		[NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
> > > +#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
> > >  		[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
> > > +#endif

> > LGTM.

> > Reviewed-by: Petr Vorel <pvorel@suse.cz>

> > Kind regards,
> > Petr

> > >  		[NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
> > >  #endif
> > >  		/* last one */ {""}

> Thanks to you both! Applied to nfsd-next (for v6.10), unless you'd
> like this to go in sooner.

Also thanks to all for a very quick fix.

Kind regards,
Petr