[PATCH] kNFSd: Fix problems when releasing cache item.

When releasing a cache item we always release anything
that is part of the key, but we ONLY release the content
is if it is valid.  i.e. if CACHE_VALID but not CACHE_NEGATIVE.

fs/nfsd/export.c

@@ -70,7 +70,8 @@ void expkey_put(struct cache_head *item, struct cache_detail *cd)
 {
 	if (cache_put(item, cd)) {
 		struct svc_expkey *key = container_of(item, struct svc_expkey, h);
-		if (key->ek_export)
+		if (test_bit(CACHE_VALID, &item->flags) &&
+		    !test_bit(CACHE_NEGATIVE, &item->flags))
 			exp_put(key->ek_export);
 		auth_domain_put(key->ek_client);
 		kfree(key);

net/sunrpc/svcauth_unix.c

@@ -90,6 +90,8 @@ void ip_map_put(struct cache_head *item, struct cache_detail *cd)
 {
 	struct ip_map *im = container_of(item, struct ip_map,h);
 	if (cache_put(item, cd)) {
+		if (test_bit(CACHE_VALID, &item->flags) &&
+		    !test_bit(CACHE_NEGATIVE, &item->flags))
 			auth_domain_put(&im->m_client->h);
 		kfree(im);
 	}