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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2941CC433EF for ; Wed, 9 Feb 2022 23:15:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229522AbiBIXO7 (ORCPT ); Wed, 9 Feb 2022 18:14:59 -0500 Received: from gmail-smtp-in.l.google.com ([23.128.96.19]:46220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234898AbiBIXO0 (ORCPT ); Wed, 9 Feb 2022 18:14:26 -0500 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 76FFEE050B81; Wed, 9 Feb 2022 15:14:29 -0800 (PST) Received: from pps.filterd (m0246630.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 219KYQum020178; Wed, 9 Feb 2022 23:14:22 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 : content-transfer-encoding : content-type : mime-version; s=corp-2021-07-09; bh=ejzW0VqgQdVY08sCESJZErpFCOudvGY9O+7ETievUYY=; b=orttwnEgjYH7p6Az1IvNTU61x4nQ4j1NR6J5Q/meTrOnqN5FyBh9IVOrIWoqmlrWiwHw YYhvlxy0fMzBy6w1JwRA7JFMbYA9dnIT0w87veDTNc/IG/2RSkI9ft6iDKtV7FR+V69d 2VYuSsy4ojMuaCojP210e2xO2ZSbTDZK9ySoFj9zRJX8w8vVHcLRrcJpGm35dHFXbWKO Onwxo0CYgaWVzLzqEbBS5CQvJFm+EjjFppxRsWKnVbYmwKVmlHM1epAE/wdCJBRZp1fK OXDbzkALLifSXqwXUVQLxhmJyINl+X21X2RR6/HkqliiomcOiyoNsu52H5FAivYMKThH 8w== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by mx0b-00069f02.pphosted.com with ESMTP id 3e366wybq7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 09 Feb 2022 23:14:22 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.1.2/8.16.1.2) with SMTP id 219NAQr7039265; Wed, 9 Feb 2022 23:14:21 GMT Received: from nam12-mw2-obe.outbound.protection.outlook.com (mail-mw2nam12lp2045.outbound.protection.outlook.com [104.47.66.45]) by userp3020.oracle.com with ESMTP id 3e1jptxr01-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 09 Feb 2022 23:14:21 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Iotmn/2fo/RFlhI0IY7w+mQJ1SawUzErwear5UcIBxhppVuCdinNroxdMWowsK+ZxzmcQdZpwZL6oqVKhPr/9jbqGY7uLqMUDlz+AAHPW3PhRksHMnHvJ8xf0npkM29qQaktMThE12k9GnlKMpAlyK3/ARrZ+zf7p4e02aCoDVTvbkKHRQQvRcZAFbV1kGL6HkFChoE52z5RnryzPj0xocdzYDCfcz2/dI+q4JYX+V4RzKlqavYCCpJpk678JYydbjmtGmxmSjLJHkEOYBPEKfYyvRWW7o7KlXIjws7E9m0EQZivDIu/JeJYZA/YQCuHq9MMd6F75f4nT74PCET9Mw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=ejzW0VqgQdVY08sCESJZErpFCOudvGY9O+7ETievUYY=; b=Kh5fCTzzVZ8YNZMNh3zX9RtFhsfyPSFCbHY0XAXPt8U7pDtoB30tIUcwuALzNHXdQJfNpMR6oTjA4/IvxF517sdjbGgBc19d1fx0vBx6MPh13Ma5hFY8nRR6T3JozIwIZVO2kNRT28OjB5pNHWp9D+axLVSNEnrzg8f8fwLSb6ErxmMGHKFVXibWUeE+USkratBzKxJ9w/OhrmbinllpCCK0ZItDyTWO+OCpzeGkyLnx/nCnbyayno2PQIzPCdgEHxw8L0em604Y5exyvcVf7n8bhcGgzpYTOX3UIi/tBiZnkvuQkLL9Tv8hjRUynHJWNEgtNNlFlH81ixYKOm+9hg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none; dmarc=none; dkim=none; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ejzW0VqgQdVY08sCESJZErpFCOudvGY9O+7ETievUYY=; b=x0cN7SH4+RH+xXWIETkYlfhfePmFZ4pxKAmzYPOuMLqcvYR4iqVVFVuzemwU0X51R5nn39enofIIa1Sifwbi5tZ1By+WSN97BRBTnTTS3kn7xBki6v/dt8Sb38lJcB8yTdFfrB8us1lPUA/1TBt5qTB7jogzIHDH7cIVqWyXAIo= Received: from CH2PR10MB4166.namprd10.prod.outlook.com (2603:10b6:610:78::20) by BLAPR10MB4884.namprd10.prod.outlook.com (2603:10b6:208:30c::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4975.11; Wed, 9 Feb 2022 23:14:18 +0000 Received: from CH2PR10MB4166.namprd10.prod.outlook.com ([fe80::f4d7:8817:4bf5:8f2a]) by CH2PR10MB4166.namprd10.prod.outlook.com ([fe80::f4d7:8817:4bf5:8f2a%4]) with mapi id 15.20.4951.018; Wed, 9 Feb 2022 23:14:18 +0000 From: Stephen Brennan To: Alexander Viro Cc: Stephen Brennan , linux-kernel@vger.kernel.org, Luis Chamberlain , Andrew Morton , Jan Kara , linux-fsdevel@vger.kernel.org, Arnd Bergmann , Amir Goldstein Subject: [PATCH v2 4/4] dcache: stop walking siblings if remaining dentries all negative Date: Wed, 9 Feb 2022 15:14:06 -0800 Message-Id: <20220209231406.187668-5-stephen.s.brennan@oracle.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220209231406.187668-1-stephen.s.brennan@oracle.com> References: <20220209231406.187668-1-stephen.s.brennan@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SA0PR13CA0018.namprd13.prod.outlook.com (2603:10b6:806:130::23) To CH2PR10MB4166.namprd10.prod.outlook.com (2603:10b6:610:78::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0a31cfea-42a2-4e54-95ff-08d9ec21e610 X-MS-TrafficTypeDiagnostic: BLAPR10MB4884:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:115; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH2PR10MB4166.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(366004)(66476007)(86362001)(52116002)(8676002)(6666004)(6506007)(8936002)(103116003)(66946007)(83380400001)(66556008)(508600001)(4326008)(2616005)(38100700002)(1076003)(186003)(26005)(54906003)(2906002)(5660300002)(6486002)(38350700002)(6916009)(36756003)(316002)(6512007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?nO6rmJCpwVgiNVBJc6HkOKarNnUJ2w43PuCQIbIAaLB3rsQ42qW7xzxqly0g?= =?us-ascii?Q?aCL4TRNrfT9w1I1VlopJwpvlprGrZdjSR/F6ZifMsGu+TM8Q2u1g+sa3XR57?= =?us-ascii?Q?k3KqgEdOgBS32i/h9XsCVAfd0ntnk/J2jTWG7W+YuhrQQzUCADvJiUu5DGfN?= =?us-ascii?Q?JruacZ5ajsgM++Zrm9ld/8S/XIqvkpOWfKFDw0U412wryVbfT/NRc9twofPe?= =?us-ascii?Q?ta2XDPGYGs3IDsvWAw1s2YMrYxiAFm3KWCoDjceocKIAYS+gmsVrfEQycxHJ?= =?us-ascii?Q?EjTsAuyzu5q9ZobYALXaA9LoE+5/1VeFj8g9SGQAVaSxVBhZ52cqMWl/KBYO?= =?us-ascii?Q?uTx5A9/Q0uMt2pjZ2PLxQtTGQjJ9LwdrNdTjGSdIGNjgmatr5REtc6wUA67I?= =?us-ascii?Q?FrIhuVw2pWq3a05x3xQ9pNK7vWldxt1UWWg6GKrvwXHAfdEZoXmXHLM9tG9M?= =?us-ascii?Q?QcnT/WcgOg0czchcvbgV8XEmxAuw3B0aFfs2spptHV9vuWR8VIxZwWynl0Tc?= =?us-ascii?Q?d3twJCwLK23hunJUF18Sw2Lb4qcGpPuTqCUSlbPt7QEdpcYa+SngH+wFfoYq?= =?us-ascii?Q?xjD27/loeFaqzHKAJPkCXfBZUs/dg+q5tjjS5jIYF9Fq7YhaBp0oTu8ZTNN1?= =?us-ascii?Q?YGVDHqZIIIVkwWNqIk8SkpJbE7OoPQgNqndaxXxG3NPY1f5hOU/t6LxfLnHk?= =?us-ascii?Q?8bS992575vXdLH9k6NIYvm/EILn2uooWLKiJ7T3dYRLias8oa4UyjES6e06D?= =?us-ascii?Q?oefu1ZTEb8vo19W/EqJZ0pdY5D89F1dqfyvW4KpHAwWVYi2xnKka+ao49ZLD?= =?us-ascii?Q?eEPdK+ss8cf3aVvUHMdU3f3O6dySlhNEe/SKtsPwsmWn6b+NhlkRybWC82Vj?= =?us-ascii?Q?pzLEBQ0E1Hb4Msfw3F/J6gEsIiOcon64eLN09JkH3Nasw1Y3DKIN+SsH9Uw0?= =?us-ascii?Q?XFwekEsrWXeaO4c8tedDNi/lXYUPJzprt3/KtjR/5nzccy9tGk82yjtx0Dwa?= =?us-ascii?Q?0zdNKiBnRcW6uv5/WpFT9xzDpXroRoyP7JWVuwCOM2L3tM6a7INQV/rhburO?= =?us-ascii?Q?Fg6T7UlsLiyXAjVSvMMnyJ6y+LkexTcG70LJ09djukQ4EiAjOVg7g5VbvNqa?= =?us-ascii?Q?nQ6MjagenqqN5M5xnu/vP2XYaLmBSygSyZ9t1PlElJqdXLfK2CK0Xm2t/Uyt?= =?us-ascii?Q?sNrqRbXu9F9xmqMJurYoY09nHXdrquqzdYV4LDwqZH5SFgJL4TZDUZmVKtC6?= =?us-ascii?Q?sjlFCOMsZY5lqaucZ6xnqbbi4BIAP9wqo/m8ijmG2lMbZscOAJr1EIjlHBQy?= =?us-ascii?Q?H0wi9qb4pOjjfAt5/xjolM+fQ2a3bTFmj6raatGYyiZgx+m8oJBRjusWI14G?= =?us-ascii?Q?QaOVeP5G5AuIGfIy0ykzhlYV3y7b5Ek+BmKU+Lg0wbDlDH4jYpMuG/FCZmON?= =?us-ascii?Q?PfWt3UQcOsdo/fEJVbDrIMIFP6E7YqqlOK/N6IL1X57puS/Ef0EeFf71g69d?= =?us-ascii?Q?w+8OQ7f9TmMzpOsnnqRXZVbc7EBluMvJkSljZaq5WBRahEydD7cKuIDEePKA?= =?us-ascii?Q?IEDrfXuTJ8Gfu28212Ik/gclTihzr0RZjSs99AT4Adsj3rzVYlpKdS/IDVvR?= =?us-ascii?Q?wE6sGvk0ABnHqusaoNxzNATk9jglKHe9NZxrUDLra1r6PMpP8BNPTGYJDiO9?= =?us-ascii?Q?deTj8g=3D=3D?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0a31cfea-42a2-4e54-95ff-08d9ec21e610 X-MS-Exchange-CrossTenant-AuthSource: CH2PR10MB4166.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Feb 2022 23:14:18.8964 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 6S0zAcyCq3CYjRMRUQ7NO6ncJe5QnVil3EO75o2MsWbEMG4N4chiNKmJx/nIoI6ydAnb2OnVNKueQPMbtX0bT/RNoQQKnHYnPDa/enZGzTQ= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BLAPR10MB4884 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10253 signatures=673431 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 mlxscore=0 bulkscore=0 malwarescore=0 suspectscore=0 phishscore=0 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202090121 X-Proofpoint-GUID: zibqtQpcc6YnNWemx6tb3GRAy9FmN7rv X-Proofpoint-ORIG-GUID: zibqtQpcc6YnNWemx6tb3GRAy9FmN7rv Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Konstantin Khlebnikov Most walkers are interested only in positive dentries. Changes in simple_* libfs helpers are mostly cosmetic: it shouldn't cache negative dentries unless uses d_delete other than always_delete_dentry(). Signed-off-by: Konstantin Khlebnikov Signed-off-by: Gautham Ananthakrishna Signed-off-by: Stephen Brennan --- fs/dcache.c | 9 +++++++++ fs/libfs.c | 3 +++ 2 files changed, 12 insertions(+) diff --git a/fs/dcache.c b/fs/dcache.c index 8809643a4d5b..e98079ed86be 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1530,6 +1530,8 @@ static enum d_walk_ret path_check_mount(void *data, struct dentry *dentry) struct check_mount *info = data; struct path path = { .mnt = info->mnt, .dentry = dentry }; + if (d_is_tail_negative(dentry)) + return D_WALK_SKIP_SIBLINGS; if (likely(!d_mountpoint(dentry))) return D_WALK_CONTINUE; if (__path_is_mountpoint(&path)) { @@ -1776,6 +1778,10 @@ void shrink_dcache_for_umount(struct super_block *sb) static enum d_walk_ret find_submount(void *_data, struct dentry *dentry) { struct dentry **victim = _data; + + if (d_is_tail_negative(dentry)) + return D_WALK_SKIP_SIBLINGS; + if (d_mountpoint(dentry)) { __dget_dlock(dentry); *victim = dentry; @@ -3256,6 +3262,9 @@ static enum d_walk_ret d_genocide_kill(void *data, struct dentry *dentry) { struct dentry *root = data; if (dentry != root) { + if (d_is_tail_negative(dentry)) + return D_WALK_SKIP_SIBLINGS; + if (d_unhashed(dentry) || !dentry->d_inode) return D_WALK_SKIP; diff --git a/fs/libfs.c b/fs/libfs.c index ba7438ab9371..13cb44cf158e 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -411,6 +411,9 @@ int simple_empty(struct dentry *dentry) spin_lock(&dentry->d_lock); list_for_each_entry(child, &dentry->d_subdirs, d_child) { + if (d_is_tail_negative(child)) + break; + spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED); if (simple_positive(child)) { spin_unlock(&child->d_lock); -- 2.30.2