[PATCH] nfsd: don't destroy global nfs4_file table in per-net shutdown

[PATCH] nfsd: don't destroy global nfs4_file table in per-net shutdown

[Jeff Layton]

The nfs4_file table is global, so shutting it down when a containerized
nfsd is shut down is wrong and can lead to double-frees. Tear down the
nfs4_file_rhltable in nfs4_state_shutdown instead of
nfs4_state_shutdown_net.

Fixes: d47b295e8d76 (NFSD: Use rhashtable for managing nfs4_file objects)
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2169017
Reported-by: JianHong Yin <jiyin@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/nfsd/nfs4state.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index af22dfdc6fcc..a202be19f26f 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -8218,7 +8218,6 @@ nfs4_state_shutdown_net(struct net *net)
 
 	nfsd4_client_tracking_exit(net);
 	nfs4_state_destroy_net(net);
-	rhltable_destroy(&nfs4_file_rhltable);
 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
 	nfsd4_ssc_shutdown_umount(nn);
 #endif
@@ -8228,6 +8227,7 @@ void
 nfs4_state_shutdown(void)
 {
 	nfsd4_destroy_callback_queue();
+	rhltable_destroy(&nfs4_file_rhltable);
 }
 
 static void
-- 
2.39.1

Re: [PATCH] nfsd: don't destroy global nfs4_file table in per-net shutdown

[Chuck Lever III]

> On Feb 11, 2023, at 7:50 AM, Jeff Layton <jlayton@kernel.org> wrote:
> 
> The nfs4_file table is global, so shutting it down when a containerized
> nfsd is shut down is wrong and can lead to double-frees. Tear down the
> nfs4_file_rhltable in nfs4_state_shutdown instead of
> nfs4_state_shutdown_net.

D'oh!


> Fixes: d47b295e8d76 (NFSD: Use rhashtable for managing nfs4_file objects)
> Link: https://bugzilla.redhat.com/show_bug.cgi?id=2169017
> Reported-by: JianHong Yin <jiyin@redhat.com>
> Signed-off-by: Jeff Layton <jlayton@kernel.org>

Thanks to you and JianHong. Applied to nfsd-fixes.


> ---
> fs/nfsd/nfs4state.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index af22dfdc6fcc..a202be19f26f 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -8218,7 +8218,6 @@ nfs4_state_shutdown_net(struct net *net)
> 
> 	nfsd4_client_tracking_exit(net);
> 	nfs4_state_destroy_net(net);
> -	rhltable_destroy(&nfs4_file_rhltable);
> #ifdef CONFIG_NFSD_V4_2_INTER_SSC
> 	nfsd4_ssc_shutdown_umount(nn);
> #endif
> @@ -8228,6 +8227,7 @@ void
> nfs4_state_shutdown(void)
> {
> 	nfsd4_destroy_callback_queue();
> +	rhltable_destroy(&nfs4_file_rhltable);
> }
> 
> static void
> -- 
> 2.39.1
> 

--
Chuck Lever

Re: [PATCH] nfsd: don't destroy global nfs4_file table in per-net shutdown

[Jeff Layton]

On Sat, 2023-02-11 at 20:31 +0000, Chuck Lever III wrote:
> 
> > On Feb 11, 2023, at 7:50 AM, Jeff Layton <jlayton@kernel.org> wrote:
> > 
> > The nfs4_file table is global, so shutting it down when a containerized
> > nfsd is shut down is wrong and can lead to double-frees. Tear down the
> > nfs4_file_rhltable in nfs4_state_shutdown instead of
> > nfs4_state_shutdown_net.
> 
> D'oh!
> 
> 
> > Fixes: d47b295e8d76 (NFSD: Use rhashtable for managing nfs4_file objects)
> > Link: https://bugzilla.redhat.com/show_bug.cgi?id=2169017
> > Reported-by: JianHong Yin <jiyin@redhat.com>
> > Signed-off-by: Jeff Layton <jlayton@kernel.org>
> 
> Thanks to you and JianHong. Applied to nfsd-fixes.
> 

Thanks for grabbing it quickly. It'd be great to get this in before v6.2
ships...

> 
> > ---
> > fs/nfsd/nfs4state.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> > index af22dfdc6fcc..a202be19f26f 100644
> > --- a/fs/nfsd/nfs4state.c
> > +++ b/fs/nfsd/nfs4state.c
> > @@ -8218,7 +8218,6 @@ nfs4_state_shutdown_net(struct net *net)
> > 
> > 	nfsd4_client_tracking_exit(net);
> > 	nfs4_state_destroy_net(net);
> > -	rhltable_destroy(&nfs4_file_rhltable);
> > #ifdef CONFIG_NFSD_V4_2_INTER_SSC
> > 	nfsd4_ssc_shutdown_umount(nn);
> > #endif
> > @@ -8228,6 +8227,7 @@ void
> > nfs4_state_shutdown(void)
> > {
> > 	nfsd4_destroy_callback_queue();
> > +	rhltable_destroy(&nfs4_file_rhltable);
> > }
> > 
> > static void
> > -- 
> > 2.39.1
> > 
> 
> --
> Chuck Lever
> 
> 
> 

-- 
Jeff Layton <jlayton@kernel.org>