From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A8B9C10F14 for ; Thu, 3 Oct 2019 17:40:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 28AFD20865 for ; Thu, 3 Oct 2019 17:40:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570124440; bh=kEmCe5eFpDf0pcPFKgaycmMa56SMC86pe2QDKHFiby0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=mxOwiy/r3pV9zItF2dC672Qj2qUsnBGdhTgtHejvFZiW/1Nlz2FJYNu54KMjzB1eU eBRNKhrJFGXckZtKjmDHKk7RJVYC/kMxTJ7ccwYlzhagmORPVc+Wdx7Ngkt0tXW1tb Oka9aT2OJOE0D22h0E19dELu9vobcy3ws6A15a3U= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731455AbfJCP7z (ORCPT ); Thu, 3 Oct 2019 11:59:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:43302 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731434AbfJCP7w (ORCPT ); Thu, 3 Oct 2019 11:59:52 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2EB11222C9; Thu, 3 Oct 2019 15:59:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118391; bh=kEmCe5eFpDf0pcPFKgaycmMa56SMC86pe2QDKHFiby0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WDzpsgZduYtPLUfbxIdGmm01geD7xFAxFZx6PwolUPUtAe+pCUxRhtCHo0/Rad/BU K/q5rEJ2oKbZ3cwYGLjJFF6MgbM/DsA3SnrFCfsfCxtM3uj6QCFznWcIQxiCThuW+E AxbdEQzJCy+rQ7gI/aLx6i/6ybALNo9rM6yd9bFU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Shilovsky , Steve French , Ronnie Sahlberg Subject: [PATCH 4.4 95/99] CIFS: Fix oplock handling for SMB 2.1+ protocols Date: Thu, 3 Oct 2019 17:53:58 +0200 Message-Id: <20191003154341.829350191@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154252.297991283@linuxfoundation.org> References: <20191003154252.297991283@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pavel Shilovsky commit a016e2794fc3a245a91946038dd8f34d65e53cc3 upstream. There may be situations when a server negotiates SMB 2.1 protocol version or higher but responds to a CREATE request with an oplock rather than a lease. Currently the client doesn't handle such a case correctly: when another CREATE comes in the server sends an oplock break to the initial CREATE and the client doesn't send an ack back due to a wrong caching level being set (READ instead of RWH). Missing an oplock break ack makes the server wait until the break times out which dramatically increases the latency of the second CREATE. Fix this by properly detecting oplocks when using SMB 2.1 protocol version and higher. Cc: Signed-off-by: Pavel Shilovsky Signed-off-by: Steve French Reviewed-by: Ronnie Sahlberg Signed-off-by: Greg Kroah-Hartman --- fs/cifs/smb2ops.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -1335,6 +1335,11 @@ smb21_set_oplock_level(struct cifsInodeI if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE) return; + /* Check if the server granted an oplock rather than a lease */ + if (oplock & SMB2_OPLOCK_LEVEL_EXCLUSIVE) + return smb2_set_oplock_level(cinode, oplock, epoch, + purge_cache); + if (oplock & SMB2_LEASE_READ_CACHING_HE) { new_oplock |= CIFS_CACHE_READ_FLG; strcat(message, "R");