From patchwork Fri Aug 21 02:29:39 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Norton.Zhu" X-Patchwork-Id: 7047711 Return-Path: X-Original-To: patchwork-ocfs2-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8D14DC05AC for ; Fri, 21 Aug 2015 02:36:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AC92020529 for ; Fri, 21 Aug 2015 02:36:06 +0000 (UTC) Received: from userp1040.oracle.com (userp1040.oracle.com [156.151.31.81]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0E7B520528 for ; Fri, 21 Aug 2015 02:36:05 +0000 (UTC) Received: from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id t7L2Yi3B016543 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 21 Aug 2015 02:34:47 GMT Received: from oss.oracle.com (oss-old-reserved.oracle.com [137.254.22.2]) by userv0022.oracle.com (8.13.8/8.13.8) with ESMTP id t7L2YgFr018307 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 21 Aug 2015 02:34:43 GMT Received: from localhost ([127.0.0.1] helo=lb-oss.oracle.com) by oss.oracle.com with esmtp (Exim 4.63) (envelope-from ) id 1ZScAE-0007yi-St; Thu, 20 Aug 2015 19:34:42 -0700 Received: from userv0022.oracle.com ([156.151.31.74]) by oss.oracle.com with esmtp (Exim 4.63) (envelope-from ) id 1ZSc9p-0007xr-8O for ocfs2-devel@oss.oracle.com; Thu, 20 Aug 2015 19:34:17 -0700 Received: from aserp1030.oracle.com (aserp1030.oracle.com [141.146.126.68]) by userv0022.oracle.com (8.13.8/8.13.8) with ESMTP id t7L2YG7j017635 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Fri, 21 Aug 2015 02:34:16 GMT Received: from userp2030.oracle.com (userp2030.oracle.com [156.151.31.89]) by aserp1030.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id t7L2YFnk011485 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Fri, 21 Aug 2015 02:34:16 GMT Received: from pps.filterd (userp2030.oracle.com [127.0.0.1]) by userp2030.oracle.com (8.15.0.59/8.15.0.59) with SMTP id t7L2YFYu045448 for ; Fri, 21 Aug 2015 02:34:15 GMT Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [58.251.152.64]) by userp2030.oracle.com with ESMTP id 1wbka3sakt-1 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=NOT) for ; Fri, 21 Aug 2015 02:34:14 +0000 Received: from 172.24.1.50 (EHLO szxeml431-hub.china.huawei.com) ([172.24.1.50]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CTM45139; Fri, 21 Aug 2015 10:29:53 +0800 (CST) Received: from [127.0.0.1] (10.177.29.54) by szxeml431-hub.china.huawei.com (10.82.67.208) with Microsoft SMTP Server id 14.3.235.1; Fri, 21 Aug 2015 10:29:41 +0800 To: From: "Norton.Zhu" Message-ID: <55D68D13.2010907@huawei.com> Date: Fri, 21 Aug 2015 10:29:39 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 X-Originating-IP: [10.177.29.54] X-CFilter-Loop: Reflected X-ServerName: szxga01-in.huawei.com X-Proofpoint-Virus-Version: vendor=nai engine=5700 definitions=7899 signatures=670626 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=4 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1507310000 definitions=main-1508210042 Cc: mfasheh@suse.com, ocfs2-devel@oss.oracle.com Subject: [Ocfs2-devel] [PATCH v2] ocfs2: optimize error handling in dlm_request_join X-BeenThere: ocfs2-devel@oss.oracle.com X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ocfs2-devel-bounces@oss.oracle.com Errors-To: ocfs2-devel-bounces@oss.oracle.com X-Source-IP: userv0022.oracle.com [156.151.31.74] X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently error handling in dlm_request_join is a little obscure. So optimize it to promote readability. changelog: If packet.code is invalid, reset it to JOIN_DISALLOW, keep it meaningful. It just make influence on the log printing. Signed-off-by: Norton.Zhu --- fs/ocfs2/dlm/dlmdomain.c | 71 ++++++++++++++++++++++++++---------------------- 1 file changed, 39 insertions(+), 32 deletions(-) diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c index 7df88a6..312a237 100644 --- a/fs/ocfs2/dlm/dlmdomain.c +++ b/fs/ocfs2/dlm/dlmdomain.c @@ -1465,39 +1465,46 @@ static int dlm_request_join(struct dlm_ctxt *dlm, if (status == -ENOPROTOOPT) { status = 0; *response = JOIN_OK_NO_MAP; - } else if (packet.code == JOIN_DISALLOW || - packet.code == JOIN_OK_NO_MAP) { - *response = packet.code; - } else if (packet.code == JOIN_PROTOCOL_MISMATCH) { - mlog(ML_NOTICE, - "This node requested DLM locking protocol %u.%u and " - "filesystem locking protocol %u.%u. At least one of " - "the protocol versions on node %d is not compatible, " - "disconnecting\n", - dlm->dlm_locking_proto.pv_major, - dlm->dlm_locking_proto.pv_minor, - dlm->fs_locking_proto.pv_major, - dlm->fs_locking_proto.pv_minor, - node); - status = -EPROTO; - *response = packet.code; - } else if (packet.code == JOIN_OK) { - *response = packet.code; - /* Use the same locking protocol as the remote node */ - dlm->dlm_locking_proto.pv_minor = packet.dlm_minor; - dlm->fs_locking_proto.pv_minor = packet.fs_minor; - mlog(0, - "Node %d responds JOIN_OK with DLM locking protocol " - "%u.%u and fs locking protocol %u.%u\n", - node, - dlm->dlm_locking_proto.pv_major, - dlm->dlm_locking_proto.pv_minor, - dlm->fs_locking_proto.pv_major, - dlm->fs_locking_proto.pv_minor); } else { - status = -EINVAL; - mlog(ML_ERROR, "invalid response %d from node %u\n", - packet.code, node); + *response = packet.code; + switch (packet.code) { + case JOIN_DISALLOW: + case JOIN_OK_NO_MAP: + break; + case JOIN_PROTOCOL_MISMATCH: + mlog(ML_NOTICE, + "This node requested DLM locking protocol %u.%u and " + "filesystem locking protocol %u.%u. At least one of " + "the protocol versions on node %d is not compatible, " + "disconnecting\n", + dlm->dlm_locking_proto.pv_major, + dlm->dlm_locking_proto.pv_minor, + dlm->fs_locking_proto.pv_major, + dlm->fs_locking_proto.pv_minor, + node); + status = -EPROTO; + break; + case JOIN_OK: + /* Use the same locking protocol as the remote node */ + dlm->dlm_locking_proto.pv_minor = packet.dlm_minor; + dlm->fs_locking_proto.pv_minor = packet.fs_minor; + mlog(0, + "Node %d responds JOIN_OK with DLM locking protocol " + "%u.%u and fs locking protocol %u.%u\n", + node, + dlm->dlm_locking_proto.pv_major, + dlm->dlm_locking_proto.pv_minor, + dlm->fs_locking_proto.pv_major, + dlm->fs_locking_proto.pv_minor); + break; + default: + status = -EINVAL; + mlog(ML_ERROR, "invalid response %d from node %u\n", + packet.code, node); + /* Reset response to JOIN_DISALLOW */ + *response = JOIN_DISALLOW; + break; + } } mlog(0, "status %d, node %d response is %d\n", status, node,