Patch "NFSD: replace delayed_work with work_struct for nfsd_client_shrinker" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    NFSD: replace delayed_work with work_struct for nfsd_client_shrinker

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfsd-replace-delayed_work-with-work_struct-for-nfsd_.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 4ccc752af4c61bb9b0325cc4771a8aa31f4f25ca
Author: Dai Ngo <dai.ngo@xxxxxxxxxx>
Date:   Wed Jan 11 16:06:51 2023 -0800

    NFSD: replace delayed_work with work_struct for nfsd_client_shrinker
    
    [ Upstream commit 7c24fa225081f31bc6da6a355c1ba801889ab29a ]
    
    Since nfsd4_state_shrinker_count always calls mod_delayed_work with
    0 delay, we can replace delayed_work with work_struct to save some
    space and overhead.
    
    Also add the call to cancel_work after unregister the shrinker
    in nfs4_state_shutdown_net.
    
    Signed-off-by: Dai Ngo <dai.ngo@xxxxxxxxxx>
    Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
    Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>

diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 8c854ba3285bb..51a4b7885cae2 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -195,7 +195,7 @@ struct nfsd_net {
 
 	atomic_t		nfsd_courtesy_clients;
 	struct shrinker		nfsd_client_shrinker;
-	struct delayed_work	nfsd_shrinker_work;
+	struct work_struct	nfsd_shrinker_work;
 };
 
 /* Simple check to find out if a given net was properly initialized */
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index ca0a1816500c3..22799f5ce686e 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4411,7 +4411,7 @@ nfsd4_state_shrinker_count(struct shrinker *shrink, struct shrink_control *sc)
 	if (!count)
 		count = atomic_long_read(&num_delegations);
 	if (count)
-		mod_delayed_work(laundry_wq, &nn->nfsd_shrinker_work, 0);
+		queue_work(laundry_wq, &nn->nfsd_shrinker_work);
 	return (unsigned long)count;
 }
 
@@ -6228,8 +6228,7 @@ deleg_reaper(struct nfsd_net *nn)
 static void
 nfsd4_state_shrinker_worker(struct work_struct *work)
 {
-	struct delayed_work *dwork = to_delayed_work(work);
-	struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
+	struct nfsd_net *nn = container_of(work, struct nfsd_net,
 				nfsd_shrinker_work);
 
 	courtesy_client_reaper(nn);
@@ -8057,7 +8056,7 @@ static int nfs4_state_create_net(struct net *net)
 	INIT_LIST_HEAD(&nn->blocked_locks_lru);
 
 	INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
-	INIT_DELAYED_WORK(&nn->nfsd_shrinker_work, nfsd4_state_shrinker_worker);
+	INIT_WORK(&nn->nfsd_shrinker_work, nfsd4_state_shrinker_worker);
 	get_net(net);
 
 	nn->nfsd_client_shrinker.scan_objects = nfsd4_state_shrinker_scan;
@@ -8164,6 +8163,7 @@ nfs4_state_shutdown_net(struct net *net)
 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 
 	unregister_shrinker(&nn->nfsd_client_shrinker);
+	cancel_work(&nn->nfsd_shrinker_work);
 	cancel_delayed_work_sync(&nn->laundromat_work);
 	locks_end_grace(&nn->nfsd4_manager);
 




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