diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index 405ebc3..3264dcf 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -32,7 +32,7 @@ static struct fscache_object *cachefiles_alloc_object(
 	struct cachefiles_cache *cache;
 	struct cachefiles_xattr *auxdata;
 	unsigned keylen, auxlen;
-	void *buffer;
+	void *buffer, *p;
 	char *key;
 
 	cache = container_of(_cache, struct cachefiles_cache, cache);
@@ -65,8 +65,12 @@ static struct fscache_object *cachefiles_alloc_object(
 	if (!buffer)
 		goto nomem_buffer;
 
-	keylen = cookie->def->get_key(cookie->netfs_data, buffer + 2, 512);
-	ASSERTCMP(keylen, <, 512);
+	keylen = cookie->key_len;
+	if (keylen <= sizeof(cookie->inline_key))
+		p = cookie->inline_key;
+	else
+		p = cookie->key;
+	memcpy(buffer + 2, p, keylen);
 
 	*(uint16_t *)buffer = keylen;
 	((char *)buffer)[keylen + 2] = 0;
@@ -80,15 +84,17 @@ static struct fscache_object *cachefiles_alloc_object(
 
 	/* get hold of the auxiliary data and prepend the object type */
 	auxdata = buffer;
-	auxlen = 0;
-	if (cookie->def->get_aux) {
-		auxlen = cookie->def->get_aux(cookie->netfs_data,
-					      auxdata->data, 511);
-		ASSERTCMP(auxlen, <, 511);
+	auxlen = cookie->aux_len;
+	if (auxlen) {
+		if (auxlen <= sizeof(cookie->inline_aux))
+			p = cookie->inline_aux;
+		else
+			p = cookie->aux;
+		memcpy(auxdata->data, p, auxlen);
 	}
 
 	auxdata->len = auxlen + 1;
-	auxdata->type = cookie->def->type;
+	auxdata->type = cookie->type;
 
 	lookup_data->auxdata = auxdata;
 	lookup_data->key = key;
@@ -206,6 +212,7 @@ static void cachefiles_update_object(struct fscache_object *_object)
 	struct cachefiles_cache *cache;
 	struct fscache_cookie *cookie;
 	const struct cred *saved_cred;
+	const void *aux;
 	unsigned auxlen;
 
 	_enter("{OBJ%x}", _object->debug_id);
@@ -220,26 +227,29 @@ static void cachefiles_update_object(struct fscache_object *_object)
 	}
 
 	cookie = object->fscache.cookie;
+	auxlen = cookie->aux_len;
 
-	if (!cookie->def->get_aux) {
+	if (!auxlen) {
 		fscache_unuse_cookie(_object);
 		_leave(" [no aux]");
 		return;
 	}
 
-	auxdata = kmalloc(2 + 512 + 3, cachefiles_gfp);
+	auxdata = kmalloc(2 + auxlen + 3, cachefiles_gfp);
 	if (!auxdata) {
 		fscache_unuse_cookie(_object);
 		_leave(" [nomem]");
 		return;
 	}
 
-	auxlen = cookie->def->get_aux(cookie->netfs_data, auxdata->data, 511);
+	aux = (auxlen <= sizeof(cookie->inline_aux)) ?
+		cookie->inline_aux : cookie->aux;
+
+	memcpy(auxdata->data, aux, auxlen);
 	fscache_unuse_cookie(_object);
-	ASSERTCMP(auxlen, <, 511);
 
 	auxdata->len = auxlen + 1;
-	auxdata->type = cookie->def->type;
+	auxdata->type = cookie->type;
 
 	cachefiles_begin_secure(cache, &saved_cred);
 	cachefiles_update_object_xattr(object, auxdata);