From a0926d15271a0139606d54d0521c527746e2815b Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@primarydata.com>
Date: Wed, 30 Jul 2014 08:27:18 -0400
Subject: nfsd: add a forget_client set_clnt routine

...that relies on the client_lock instead of client_mutex.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/fault_inject.c b/fs/nfsd/fault_inject.c
index a0387fd..5f3ead0 100644
--- a/fs/nfsd/fault_inject.c
+++ b/fs/nfsd/fault_inject.c
@@ -136,7 +136,7 @@ static struct nfsd_fault_inject_op inject_ops[] = {
 		.file     = "forget_clients",
 		.get	  = nfsd_inject_print_clients,
 		.set_val  = nfsd_inject_set,
-		.set_clnt = nfsd_inject_set_client,
+		.set_clnt = nfsd_inject_forget_client,
 		.forget   = nfsd_forget_client,
 	},
 	{
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 2225e11..c4c28f8 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -5760,6 +5760,34 @@ u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
 	return 1;
 }
 
+u64
+nfsd_inject_forget_client(struct nfsd_fault_inject_op *op,
+			  struct sockaddr_storage *addr, size_t addr_size)
+{
+	u64 count = 0;
+	struct nfs4_client *clp;
+	struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
+					  nfsd_net_id);
+
+	if (!nfsd_netns_ready(nn))
+		return count;
+
+	spin_lock(&nn->client_lock);
+	clp = nfsd_find_client(addr, addr_size);
+	if (clp) {
+		if (mark_client_expired_locked(clp) == nfs_ok)
+			++count;
+		else
+			clp = NULL;
+	}
+	spin_unlock(&nn->client_lock);
+
+	if (clp)
+		expire_client(clp);
+
+	return count;
+}
+
 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
 			     const char *type)
 {
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 7c7580e..77a1903 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -480,6 +480,9 @@ struct nfs4_client *nfsd_find_client(struct sockaddr_storage *, size_t);
 
 u64 nfsd_inject_print_clients(struct nfsd_fault_inject_op *op);
 u64 nfsd_forget_client(struct nfs4_client *, u64);
+u64 nfsd_inject_forget_client(struct nfsd_fault_inject_op *,
+			      struct sockaddr_storage *, size_t);
+
 u64 nfsd_forget_client_locks(struct nfs4_client*, u64);
 u64 nfsd_forget_client_openowners(struct nfs4_client *, u64);
 u64 nfsd_forget_client_delegations(struct nfs4_client *, u64);
-- 
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