[core] don't buffer request bodies smaller than 64k on disk

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@3046 152afb58-edef-0310-8abb-c4023f1b3aa9

NEWS

@@ -9,6 +9,7 @@ NEWS
   * [core] fix search for header end if split across chunks (fixes #2670)
   * [core] check configparserAlloc() result with force_assert
   * [mod_auth] implement and use safe_memclear, using memset_s or explicit_bzero if available (thx loganaden)
+  * [core] don't buffer request bodies smaller than 64k on disk
 
 - 1.4.37 - 2015-08-30
   * [mod_proxy] remove debug log line from error log (fixes #2659)

src/connections.c

@@ -983,7 +983,11 @@ found_header_end:
 		}
 		break;
 	case CON_STATE_READ_POST:
-		if (0 != chunkqueue_steal_with_tempfiles(srv, dst_cq, cq, con->request.content_length - dst_cq->bytes_in )) {
+		if (con->request.content_length <= 64*1024) {
+			/* don't buffer request bodies <= 64k on disk */
+			chunkqueue_steal(dst_cq, cq, con->request.content_length - dst_cq->bytes_in);
+		}
+		else if (0 != chunkqueue_steal_with_tempfiles(srv, dst_cq, cq, con->request.content_length - dst_cq->bytes_in )) {
 			con->http_status = 413; /* Request-Entity too large */
 			con->keep_alive = 0;
 			connection_set_state(srv, con, CON_STATE_HANDLE_REQUEST);