From patchwork Thu Oct 22 07:43:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anand Jain X-Patchwork-Id: 11850443 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,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 9531EC4363A for ; Thu, 22 Oct 2020 07:46:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3555121707 for ; Thu, 22 Oct 2020 07:46:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="ztA1TGft" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2507176AbgJVHqG (ORCPT ); Thu, 22 Oct 2020 03:46:06 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:58710 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2442023AbgJVHqF (ORCPT ); Thu, 22 Oct 2020 03:46:05 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 09M7iHiH136421; Thu, 22 Oct 2020 07:45:59 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=3lgTb5s9mcZDmJXNLrEMS44OxCOSHdKTVNG3EmCxgh4=; b=ztA1TGftukYifK6xgt6Wy4baT7nJLAY8WjTNvUkwQSJsK9QAI/z8kkxSimhOZYrwMdv8 dZYXuhcxWvklKYeljHUe2PAAqyktjGrbJYVkA/Ejpsk6dGaPIAKr+2uK8or40DJvzpiP xTVQnjtBR7oMDeHvF+2za7yxNvUtAfqegBTx61thAnaXrm7gV/wZTSS/jpTiuct4970M Nf0OBo6uzHNaAJFDNI29Y6qiWrnkPK4ucUq5cKDWMdSxUx7wM6NPZbjyQ43O9XlSFjwt u5nrl3HEEoVu9V7k3xkDolvw20c/U37C7/I1CiaTwtv0WWlVsfivFRXsMcWQugm2ASqi Jg== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2120.oracle.com with ESMTP id 34ak16mp7f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 22 Oct 2020 07:45:59 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 09M7a8EX176631; Thu, 22 Oct 2020 07:43:59 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3030.oracle.com with ESMTP id 348a6qaa52-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 22 Oct 2020 07:43:59 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 09M7hveW012650; Thu, 22 Oct 2020 07:43:57 GMT Received: from localhost.localdomain (/39.109.231.106) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 22 Oct 2020 00:43:56 -0700 From: Anand Jain To: linux-btrfs@vger.kernel.org Cc: josef@toxicpanda.com, dsterba@suse.com Subject: [PATCH v9 1/3] btrfs: add btrfs_strmatch helper Date: Thu, 22 Oct 2020 15:43:35 +0800 Message-Id: <75264e50d49f3c68cc14dc87510c8f3767390dcf.1603347462.git.anand.jain@oracle.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9781 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxlogscore=999 bulkscore=0 spamscore=0 adultscore=0 suspectscore=1 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2010220049 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9781 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 mlxscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 spamscore=0 mlxlogscore=999 suspectscore=1 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2010220050 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Add a generic helper to match the golden-string in the given-string, and ignore the leading and trailing whitespaces if any. Signed-off-by: Anand Jain Suggested-by: David Sterba --- v9: use Josef suggested C coding style, using single if statement. v5: born fs/btrfs/sysfs.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 8424f5d0e5ed..5ea262d289c6 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -863,6 +863,26 @@ static ssize_t btrfs_generation_show(struct kobject *kobj, } BTRFS_ATTR(, generation, btrfs_generation_show); +/* + * Match the %golden in the %given. Ignore the leading and trailing whitespaces + * if any. + */ +static int btrfs_strmatch(const char *given, const char *golden) +{ + size_t len = strlen(golden); + char *stripped; + + /* strip leading whitespace */ + stripped = skip_spaces(given); + + /* strip trailing whitespace */ + if ((strncmp(stripped, golden, len) == 0) && + (strlen(skip_spaces(stripped + len)) == 0)) + return 0; + + return -EINVAL; +} + static const struct attribute *btrfs_attrs[] = { BTRFS_ATTR_PTR(, label), BTRFS_ATTR_PTR(, nodesize),