From patchwork Fri Nov 22 01:40:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alistair Popple X-Patchwork-Id: 13882583 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2040.outbound.protection.outlook.com [40.107.237.40]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7894F15CD58; Fri, 22 Nov 2024 01:41:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.237.40 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732239683; cv=fail; b=dNwzRoc0mTvKSZba7ucgigyQ3Ea87pVaiwN/dpz7ouFs2mHbv2MJ+PSofJPw9IGTQ1QC1SNZha8IgTOys4Cr2sKen5cSGelua11xskuETlotM6e+sdmMCEjnTwcLPPvlWEJn0hjkiHXke4KnjG9ti2gazjQTKqC6/fu1X9l6T6E= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732239683; c=relaxed/simple; bh=OMskb6tiJXN/oVWhmqvQ06ZN7nbmfyJDrXPM0IWvd4w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=KT7TcFDrC3jFTEOxfqychkGMnk74/I12bhk4+MjrwEIf22X4wA3GOQbLn9cwFL10RGf+JutzAtaBfK6b6FvsITLsnqeSuSjbtaVonZRHN6aHB4mB8kCwQlEp06WrkotvIjblKonkTPj+HrSfwquMgDQD3/0P4zogb6cK6P/B2d8= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=ru/dcUVL; arc=fail smtp.client-ip=40.107.237.40 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="ru/dcUVL" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=BHYG9WNQ2IqBx6KlQPGT05KkTMahrGbQmdjjUlGR+2iX+xM18ap9D71jEgQRgGm0R5udJftd6jlXZZfQT/Pk8PRTLCu41i89fJC8J069UjRpyzYGJIvda3GBSfYouU0dcrEkwipAFa+hR/W1QsEYrs211gximydRC7AefGCid9PYKerSc9VQW0k95se9+hYgFst/zbxaNIsQ/zAj5gLf276sE2hqN42el5tp7sRcN+rk/tVHkljRnPvDSoLl6hQKGR47YiRiL5HkE3tEOXjYzZOynqiwuHXyBVy1AhJxYnMcxGCDjG9cJj8HgwgGYiYFdVd/QpRxvWCrDzNPFb4fhw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; 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=JRQQVpyhJF5f1obr6Ie6XHXs8vyPo99NnnyCrsA9+Pc=; b=KbJYiWSsoYmRC+y6JNvfPgyoQ5u5Tv+JqlAHrcjE3QvVkBINnnUXNBwDz+jyYdykkyMyYGo5AS7inwGNWHVbbgtF6EKXYEz9JXpJU84w0tiMtbwFSiGNKZMnFRxujfX6wty2QaNClKw86Iit5u3vtpt6HQD+rWqTYlzBmO9ScWuUyTzZceXoAX3RrFD7pjJaC15TcqtDU8aP0RKmPO+7YOO2Y1+bcCkIHF6m2q1UJI7EnQWtVHVmB/ySGwmlIgOqquJXnJafY9TnNiXzY8U/cH7kT2fQ5wpqTR6Oul00EOa+KkPX1hWb3IiHQ2/eaoGkC3YekgcS9ZZj27wZnGVNIA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=JRQQVpyhJF5f1obr6Ie6XHXs8vyPo99NnnyCrsA9+Pc=; b=ru/dcUVLPZH/Ey5zbEfpLtfyBcKkXi0D3gHBAHbW9lqCvD6qaYoTzHspETvR1XZUuivurIfhPtYvz+DQF29/RbW7gOQy2FywKt+Bd0h4WbCOtBIJBgplbxndzpyNQ4bkEahmmX7Uw1fUZ2Mn2BXoFSwl1AiaU3KCaNN8SdmkLhwwaXmWFLblLWkEP+HPrLiVGUX0uuabqiLanleiI6QtTPvndZqOB2f+pB+BeG9h/If0hXV7XLJra6zL0SWreqb05tsC421w4nMWbwZraIqnPKFiqVZMXHWLyN8K596MK+r4VCzVJffCfAH2fkPdBpbW24X5rIWzFyFGU1cp+0pwXA== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from DS0PR12MB7726.namprd12.prod.outlook.com (2603:10b6:8:130::6) by IA1PR12MB6305.namprd12.prod.outlook.com (2603:10b6:208:3e7::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8182.17; Fri, 22 Nov 2024 01:41:18 +0000 Received: from DS0PR12MB7726.namprd12.prod.outlook.com ([fe80::953f:2f80:90c5:67fe]) by DS0PR12MB7726.namprd12.prod.outlook.com ([fe80::953f:2f80:90c5:67fe%4]) with mapi id 15.20.8182.016; Fri, 22 Nov 2024 01:41:18 +0000 From: Alistair Popple To: dan.j.williams@intel.com, linux-mm@kvack.org Cc: Alistair Popple , lina@asahilina.net, zhang.lyra@gmail.com, gerald.schaefer@linux.ibm.com, vishal.l.verma@intel.com, dave.jiang@intel.com, logang@deltatee.com, bhelgaas@google.com, jack@suse.cz, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, dave.hansen@linux.intel.com, ira.weiny@intel.com, willy@infradead.org, djwong@kernel.org, tytso@mit.edu, linmiaohe@huawei.com, david@redhat.com, peterx@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com Subject: [PATCH v3 02/25] fs/dax: Return unmapped busy pages from dax_layout_busy_page_range() Date: Fri, 22 Nov 2024 12:40:23 +1100 Message-ID: <0884b6a6e0f9ee4bb982a043da94fd910ee800f1.1732239628.git-series.apopple@nvidia.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: References: X-ClientProxiedBy: SYCPR01CA0041.ausprd01.prod.outlook.com (2603:10c6:10:e::29) To DS0PR12MB7726.namprd12.prod.outlook.com (2603:10b6:8:130::6) Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR12MB7726:EE_|IA1PR12MB6305:EE_ X-MS-Office365-Filtering-Correlation-Id: 458cb362-5519-42b3-6989-08dd0a96c264 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014|7053199007; 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:DS0PR12MB7726.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(366016)(7416014)(376014)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 458cb362-5519-42b3-6989-08dd0a96c264 X-MS-Exchange-CrossTenant-AuthSource: DS0PR12MB7726.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Nov 2024 01:41:18.0397 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: fKerGv082UjkAIE8S2+bAoi9U3PeEL1YGlo+2SSuWtVgBJ24Ok1liWEjhe40UXyOcoxk/vlhCYlxiypfY5wHAA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6305 dax_layout_busy_page_range() is used by file systems to scan the DAX page-cache to unmap mapping pages from user-space and to determine if any pages in the given range are busy, either due to ongoing DMA or other get_user_pages() usage. Currently it checks to see the file mapping is mapped into user-space with mapping_mapped() and returns early if not, skipping the check for DMA busy pages. This is wrong as pages may still be undergoing DMA access even if they have subsequently been unmapped from user-space. Fix this by dropping the check for mapping_mapped(). Signed-off-by: Alistair Popple Suggested-by: Dan Williams --- fs/dax.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/dax.c b/fs/dax.c index c62acd2..a675eb2 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -690,7 +690,7 @@ struct page *dax_layout_busy_page_range(struct address_space *mapping, if (IS_ENABLED(CONFIG_FS_DAX_LIMITED)) return NULL; - if (!dax_mapping(mapping) || !mapping_mapped(mapping)) + if (!dax_mapping(mapping)) return NULL; /* If end == LLONG_MAX, all pages from start to till end of file */