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=-7.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_SANE_1 autolearn=no 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 57B44C433E0 for ; Thu, 28 Jan 2021 11:31:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 049B664DDB for ; Thu, 28 Jan 2021 11:31:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231146AbhA1Lb3 (ORCPT ); Thu, 28 Jan 2021 06:31:29 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:45372 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229594AbhA1Lb2 (ORCPT ); Thu, 28 Jan 2021 06:31:28 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 10SBTtas079084; Thu, 28 Jan 2021 11:30:43 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : in-reply-to; s=corp-2020-01-29; bh=uGd+0Xb/YePYFlGoeYygjd5U5w/9yKRZJtjuoquYzXQ=; b=pt6bYTUwhb4d20SJeNW8th3dXpaf5KjmJLL45S/Yji5Pr8bOQhec6/+0haUUGDYr4dlU f/2n1YMsjmLt0ufft/qOvf+la/004+lo78Q+DR/u7aIdbW6+uBUMKy6Ijgvq8Krf7zdT baNzv6/l3ec2TYXVcjQGzFgeWAVlfNhj/Oio7suAnDJcOHql+V4FS8sXZA9RAad3LzoS L2GFro9N2EcBMx9KtDzqygjgvJkjHxqNS5B+nj3rVQBCB5PxvbSYas8zeicv57tmCduT Kj04vWqFZXZQfIjuKvyNxLA7dJ78jDV8+LhXSwwGsB4w0zwQVqsKJgVhaLuHLDg7GSHK yw== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2130.oracle.com with ESMTP id 368b7r3pjx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 28 Jan 2021 11:30:43 +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 10SBLBdc001613; Thu, 28 Jan 2021 11:30:41 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3030.oracle.com with ESMTP id 368wcqjwdy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 28 Jan 2021 11:30:41 +0000 Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 10SBUdgg023435; Thu, 28 Jan 2021 11:30:39 GMT Received: from kadam (/102.36.221.92) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 28 Jan 2021 03:30:39 -0800 Date: Thu, 28 Jan 2021 14:30:33 +0300 From: Dan Carpenter To: Qu Wenruo Cc: linux-btrfs@vger.kernel.org Subject: Re: [PATCH] btrfs: add comment on why we can return 0 if we failed to atomically lock the page in read_extent_buffer_pages() Message-ID: <20210128113032.GS20820@kadam> References: <20210128112508.123614-1-wqu@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210128112508.123614-1-wqu@suse.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9877 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxscore=0 suspectscore=0 phishscore=0 mlxlogscore=999 bulkscore=0 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101280057 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9877 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 spamscore=0 phishscore=0 adultscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 mlxscore=0 clxscore=1015 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101280058 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Yeah. Once you know it's only for readahead then that makes perfect sense. Thanks! regards, dan carpenter