NFSD: Clean up forgetting openowners

Using "forget_n_state()" forces me to implement the code needed to
forget a specific client's openowners.
Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4state.c

@@ -4637,6 +4637,26 @@ u64 nfsd_forget_client_locks(struct nfs4_client *clp, u64 max)
 	return nfsd_foreach_client_lock(clp, max, release_lockowner);
 }
 
+static u64 nfsd_foreach_client_open(struct nfs4_client *clp, u64 max, void (*func)(struct nfs4_openowner *))
+{
+	struct nfs4_openowner *oop, *next;
+	u64 count = 0;
+
+	list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
+		if (func)
+			func(oop);
+		if (++count == max)
+			break;
+	}
+
+	return count;
+}
+
+u64 nfsd_forget_client_openowners(struct nfs4_client *clp, u64 max)
+{
+	return nfsd_foreach_client_open(clp, max, release_openowner);
+}
+
 u64 nfsd_for_n_state(u64 max, u64 (*func)(struct nfs4_client *, u64))
 {
 	struct nfs4_client *clp, *next;
@@ -4661,30 +4681,6 @@ void nfsd_forget_clients(u64 num)
 	printk(KERN_INFO "NFSD: Forgot %llu clients", count);
 }
 
-static void release_openowner_sop(struct nfs4_stateowner *sop)
-{
-	release_openowner(openowner(sop));
-}
-
-static int nfsd_release_n_owners(u64 num, bool is_open_owner,
-				void (*release_sop)(struct nfs4_stateowner *),
-				struct nfsd_net *nn)
-{
-	int i, count = 0;
-	struct nfs4_stateowner *sop, *next;
-
-	for (i = 0; i < OWNER_HASH_SIZE; i++) {
-		list_for_each_entry_safe(sop, next, &nn->ownerstr_hashtbl[i], so_strhash) {
-			if (sop->so_is_open_owner != is_open_owner)
-				continue;
-			release_sop(sop);
-			if (++count == num)
-				return count;
-		}
-	}
-	return count;
-}
-
 void nfsd_forget_locks(u64 num)
 {
 	u64 count = nfsd_for_n_state(num, nfsd_forget_client_locks);
@@ -4693,9 +4689,8 @@ void nfsd_forget_locks(u64 num)
 
 void nfsd_forget_openowners(u64 num)
 {
-	struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id);
-	int count = nfsd_release_n_owners(num, true, release_openowner_sop, nn);
-	printk(KERN_INFO "NFSD: Forgot %d open owners", count);
+	u64 count = nfsd_for_n_state(num, nfsd_forget_client_openowners);
+	printk(KERN_INFO "NFSD: Forgot %llu open owners", count);
 }
 
 static int nfsd_process_n_delegations(u64 num, struct list_head *list)