From patchwork Fri Oct 14 20:36:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ojaswin Mujoo X-Patchwork-Id: 13007310 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5DBCFC4321E for ; Fri, 14 Oct 2022 20:37:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231511AbiJNUh0 (ORCPT ); Fri, 14 Oct 2022 16:37:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231503AbiJNUhV (ORCPT ); Fri, 14 Oct 2022 16:37:21 -0400 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37A57E22EB; Fri, 14 Oct 2022 13:36:56 -0700 (PDT) Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 29EIxpxY032271; Fri, 14 Oct 2022 20:36:51 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=uju5r2ZMBGoIR5kk52WPXzsCPs50oTLfQ2yC39sIArk=; b=j129xyoM3Khu54r0771K7KNRRM9LVwj4/zp3Z2eGJ5b65a1fvhWvAC+k7qaJSFqB/YgN 8TtpqQYueW6LP+IN8p0GJNrBZhgWGyE0uHYttKwjXpRlLk8/GdEJtF2CbL1Tf+xErraK TkjLXPeYHex+yMoxjMy6h86CaMi2+0NVrqdUdOWE2Oxrz9uzX+qu7j9mxbcOrPSBiWEd FV8kUAXn2hYzy++tDfTffekSQh41xr8ytMk0nNBGujKBBY/dYTzNNoQRZnHhI95YknBP wtr0llOAvLkP2hZW+Od+v/vjP5qvm+EfQK/lHlR/E2gBBc0DI7zIDzfoA2SaQgOQYGeZ ww== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3k7dhejqqf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 14 Oct 2022 20:36:51 +0000 Received: from m0127361.ppops.net (m0127361.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 29EKAJPC004118; Fri, 14 Oct 2022 20:36:50 GMT Received: from ppma06ams.nl.ibm.com (66.31.33a9.ip4.static.sl-reverse.com [169.51.49.102]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3k7dhejqpm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 14 Oct 2022 20:36:50 +0000 Received: from pps.filterd (ppma06ams.nl.ibm.com [127.0.0.1]) by ppma06ams.nl.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 29EKamMH016753; Fri, 14 Oct 2022 20:36:48 GMT Received: from b06avi18878370.portsmouth.uk.ibm.com (b06avi18878370.portsmouth.uk.ibm.com [9.149.26.194]) by ppma06ams.nl.ibm.com with ESMTP id 3k30fjhws5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 14 Oct 2022 20:36:48 +0000 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 29EKbIKL52298158 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 14 Oct 2022 20:37:18 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6245442041; Fri, 14 Oct 2022 20:36:46 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 147B44203F; Fri, 14 Oct 2022 20:36:44 +0000 (GMT) Received: from li-bb2b2a4c-3307-11b2-a85c-8fa5c3a69313.ibm.com (unknown [9.43.122.214]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 14 Oct 2022 20:36:43 +0000 (GMT) From: Ojaswin Mujoo To: linux-ext4@vger.kernel.org, "Theodore Ts'o" Cc: Ritesh Harjani , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Andreas Dilger , Jan Kara , rookxu , Ritesh Harjani Subject: [PATCH v2 4/8] ext4: Move overlap assert logic into a separate function Date: Sat, 15 Oct 2022 02:06:26 +0530 Message-Id: <2cc301d39f072148ffabf136df255be707d8f706.1665776268.git.ojaswin@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: n5Cz3yqGrFiDadGxwfZ8gaw2bjXGfju3 X-Proofpoint-ORIG-GUID: 9I8RdPNSMvlL8vgjB2MTZLMIQbfBefJf X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-14_11,2022-10-14_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 mlxscore=0 spamscore=0 clxscore=1015 mlxlogscore=999 adultscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210140112 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Abstract out the logic to double check for overlaps in normalize_pa to a separate function. Since there has been no reports in past where we have seen any overlaps which hits this bug_on(), in future we can consider calling this function under "#ifdef AGGRESSIVE_CHECK" only. There are no functional changes in this patch Signed-off-by: Ojaswin Mujoo Reviewed-by: Ritesh Harjani (IBM) Reviewed-by: Jan Kara --- fs/ext4/mballoc.c | 36 ++++++++++++++++++++++++------------ 1 file changed, 24 insertions(+), 12 deletions(-) diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 89dcb72869cd..210f90a6229a 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -3984,6 +3984,29 @@ static void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac) mb_debug(sb, "goal %u blocks for locality group\n", ac->ac_g_ex.fe_len); } +static inline void +ext4_mb_pa_assert_overlap(struct ext4_allocation_context *ac, + ext4_lblk_t start, ext4_lblk_t end) +{ + struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); + struct ext4_inode_info *ei = EXT4_I(ac->ac_inode); + struct ext4_prealloc_space *tmp_pa; + ext4_lblk_t tmp_pa_start, tmp_pa_end; + + rcu_read_lock(); + list_for_each_entry_rcu(tmp_pa, &ei->i_prealloc_list, pa_inode_list) { + spin_lock(&tmp_pa->pa_lock); + if (tmp_pa->pa_deleted == 0) { + tmp_pa_start = tmp_pa->pa_lstart; + tmp_pa_end = tmp_pa->pa_lstart + EXT4_C2B(sbi, tmp_pa->pa_len); + + BUG_ON(!(start >= tmp_pa_end || end <= tmp_pa_start)); + } + spin_unlock(&tmp_pa->pa_lock); + } + rcu_read_unlock(); +} + /* * Normalization means making request better in terms of * size and alignment @@ -4140,18 +4163,7 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac, size = end - start; /* XXX: extra loop to check we really don't overlap preallocations */ - rcu_read_lock(); - list_for_each_entry_rcu(tmp_pa, &ei->i_prealloc_list, pa_inode_list) { - spin_lock(&tmp_pa->pa_lock); - if (tmp_pa->pa_deleted == 0) { - tmp_pa_start = tmp_pa->pa_lstart; - tmp_pa_end = tmp_pa->pa_lstart + EXT4_C2B(sbi, tmp_pa->pa_len); - - BUG_ON(!(start >= tmp_pa_end || end <= tmp_pa_start)); - } - spin_unlock(&tmp_pa->pa_lock); - } - rcu_read_unlock(); + ext4_mb_pa_assert_overlap(ac, start, end); /* * In this function "start" and "size" are normalized for better