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,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 02B3CC43603 for ; Wed, 11 Dec 2019 15:25:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CBC442465A for ; Wed, 11 Dec 2019 15:25:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576077915; bh=yNEKqnYFfGAB5VCK7Vas/fD9z/qwhU9RBGBWkm0MGc4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WebKvJUvmUaIeMgEc3olU2mrqmbbPWwqGM0slFQvKhBaAv450yafmbpr5yeXBRRcb jm5EG7y9sEgcwyJqfsfyFUSi4waaYqPPe5883zzEAMAJBzj95WT5CTpmztLy1QfsFm da9rC4h9HwQAP9UL4+IZqfE8UmHpLtfMVR2/v39g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732970AbfLKPZO (ORCPT ); Wed, 11 Dec 2019 10:25:14 -0500 Received: from mail.kernel.org ([198.145.29.99]:56920 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732659AbfLKPZK (ORCPT ); Wed, 11 Dec 2019 10:25:10 -0500 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 A78B124658; Wed, 11 Dec 2019 15:25:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576077910; bh=yNEKqnYFfGAB5VCK7Vas/fD9z/qwhU9RBGBWkm0MGc4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sg6WPDBwiCn/2cnwWEGA65TtRsZ994or3Qgsk8xBKX8fThmVDfBYWH3r7GkHwxOMq FreWY1dFEe7GKa9PLTlfNFBp+QStXySso74aUDcn9qKQgpxmzGMf+Q4gIoDOZgXcPY q2JjzoJF405bwPV3tJ32KFJLvHYmtFyWhsO94n2E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Shilovsky , Steve French Subject: [PATCH 4.19 217/243] CIFS: Fix SMB2 oplock break processing Date: Wed, 11 Dec 2019 16:06:19 +0100 Message-Id: <20191211150353.989552055@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191211150339.185439726@linuxfoundation.org> References: <20191211150339.185439726@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 fa9c2362497fbd64788063288dc4e74daf977ebb upstream. Even when mounting modern protocol version the server may be configured without supporting SMB2.1 leases and the client uses SMB2 oplock to optimize IO performance through local caching. However there is a problem in oplock break handling that leads to missing a break notification on the client who has a file opened. It latter causes big latencies to other clients that are trying to open the same file. The problem reproduces when there are multiple shares from the same server mounted on the client. The processing code tries to match persistent and volatile file ids from the break notification with an open file but it skips all share besides the first one. Fix this by looking up in all shares belonging to the server that issued the oplock break. Cc: Stable Signed-off-by: Pavel Shilovsky Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/cifs/smb2misc.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- a/fs/cifs/smb2misc.c +++ b/fs/cifs/smb2misc.c @@ -673,10 +673,10 @@ smb2_is_valid_oplock_break(char *buffer, spin_lock(&cifs_tcp_ses_lock); list_for_each(tmp, &server->smb_ses_list) { ses = list_entry(tmp, struct cifs_ses, smb_ses_list); + list_for_each(tmp1, &ses->tcon_list) { tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); - cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); spin_lock(&tcon->open_file_lock); list_for_each(tmp2, &tcon->openFileList) { cfile = list_entry(tmp2, struct cifsFileInfo, @@ -688,6 +688,8 @@ smb2_is_valid_oplock_break(char *buffer, continue; cifs_dbg(FYI, "file id match, oplock break\n"); + cifs_stats_inc( + &tcon->stats.cifs_stats.num_oplock_brks); cinode = CIFS_I(d_inode(cfile->dentry)); spin_lock(&cfile->file_info_lock); if (!CIFS_CACHE_WRITE(cinode) && @@ -720,9 +722,6 @@ smb2_is_valid_oplock_break(char *buffer, return true; } spin_unlock(&tcon->open_file_lock); - spin_unlock(&cifs_tcp_ses_lock); - cifs_dbg(FYI, "No matching file for oplock break\n"); - return true; } } spin_unlock(&cifs_tcp_ses_lock);