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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B142C4829E for ; Mon, 12 Feb 2024 22:04:15 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C457B6B00A9; Mon, 12 Feb 2024 17:04:14 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id BF5AA6B00AA; Mon, 12 Feb 2024 17:04:14 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A6F496B00AD; Mon, 12 Feb 2024 17:04:14 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 983596B00A9 for ; Mon, 12 Feb 2024 17:04:14 -0500 (EST) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 685D01A0575 for ; Mon, 12 Feb 2024 22:04:14 +0000 (UTC) X-FDA: 81784530828.14.871F0DE Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.20]) by imf19.hostedemail.com (Postfix) with ESMTP id 15E921A0025 for ; Mon, 12 Feb 2024 22:04:09 +0000 (UTC) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=khKJ+dFw; dmarc=pass (policy=none) header.from=intel.com; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}"); spf=pass (imf19.hostedemail.com: domain of dan.j.williams@intel.com designates 198.175.65.20 as permitted sender) smtp.mailfrom=dan.j.williams@intel.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1707775450; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=xHR8kZFDkaC8y1fxiiDOovfwwZswgXp35nQtQhl94jk=; b=c+goENy/lyCAK6fq2uaePRrBUpu5mTKKBWq+w4IWJJMmHW3pP30LeWXqZH4uikwXfAEgWI quWNCWYin60INcap8CG6jweacr4D0t/PAumAW8UOaOH2iv3O+LIK+58cpgAFhrwYVFLxrh Ka2/wncMrQ2GdltH2Jx0On3FB3RA3+s= ARC-Authentication-Results: i=2; imf19.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=khKJ+dFw; dmarc=pass (policy=none) header.from=intel.com; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}"); spf=pass (imf19.hostedemail.com: domain of dan.j.williams@intel.com designates 198.175.65.20 as permitted sender) smtp.mailfrom=dan.j.williams@intel.com ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1707775450; a=rsa-sha256; cv=fail; b=3HE89d3Qx6PVJCj2SmeRLPo7Qx/7d2Jt4DP8Nnde3uTMLUzANI5UZH98QtY8Bu/g3B3LrV j9yRTNyuX8kIonFZ5rvgqjjujP4apYD+AXkHAGI8TFU7BQIENIhpG5cR1s47kwcyMSfSPy Xbe/B5so8XI/rNi9oLxX0oQbXHxGHlw= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1707775450; x=1739311450; h=date:from:to:cc:subject:message-id:references: in-reply-to:mime-version; bh=J0O1SnAA2+qtyjA+UxGvsUFFSxIsq3NF44M1F8/x6Vg=; b=khKJ+dFwn2i4OWFrUQ0batLQRTQ/hURHrtwsl+Uc4Ei6QkVkp0vWHU1/ sOd/KlldW+B/5ulC0TpgXp6n7c+Nb4h6+054JjQI0mjFHC/8cpbC6cean oUS/dHkTTl61jFc2vJFfCGhV65koDE5NrE6KYydMSNubKM5Rm8X0dv50i ez2eul0j9GtmvZ7ElnrLsVOYbyn96nAHLaC9gjFviLCTkdiNawwNvtFdn B6ErPKgQuc1MXEAw/vk1g6tW3O9EJTgAH+gf8tzGvCpSC2zkusFQ+z+C8 zGCUWmY1WgHWiMHkQ0f2ZDK9zLhpovOgx3P4j6gAQiKV1bi8++4qpYtN1 Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10982"; a="1649421" X-IronPort-AV: E=Sophos;i="6.06,155,1705392000"; d="scan'208";a="1649421" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Feb 2024 14:04:08 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10982"; a="911612578" X-IronPort-AV: E=Sophos;i="6.06,155,1705392000"; d="scan'208";a="911612578" Received: from fmsmsx602.amr.corp.intel.com ([10.18.126.82]) by fmsmga002.fm.intel.com with ESMTP/TLS/AES256-GCM-SHA384; 12 Feb 2024 14:04:07 -0800 Received: from fmsmsx610.amr.corp.intel.com (10.18.126.90) by fmsmsx602.amr.corp.intel.com (10.18.126.82) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Mon, 12 Feb 2024 14:04:07 -0800 Received: from FMSEDG603.ED.cps.intel.com (10.1.192.133) by fmsmsx610.amr.corp.intel.com (10.18.126.90) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35 via Frontend Transport; Mon, 12 Feb 2024 14:04:07 -0800 Received: from NAM10-BN7-obe.outbound.protection.outlook.com (104.47.70.101) by edgegateway.intel.com (192.55.55.68) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Mon, 12 Feb 2024 14:04:07 -0800 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=YlFbrXfx6OGoSqCeLdGbGJJtZ5KpM5K6j16gNKWbgFL191Uaaz9zEJRG33Btbjc/+S+W/bzBqGGnJLxITa/wn0WnB1PKmolnwgRJ0vx8NETRcJC9YU9U9heDUhT6Ajg1/dPjKbj3ofNsIDdIorXjtHHepBKBjHfJv2zn/ctli+GIEJ1MGBjqcHAKC9K9ZSecg9kJbHVpBfu5FnYivghhyTWWV+OXOIsFiXM9ohOkRfUYNtXAyZF9Yb++N2bX9MWeCaVLYahhPohRCJJlODU1thk4O57NBCIs+i6ke80mRSrMs9jcxEZtG3ca08wQOH6vu9TFclt4pPWNo/Zu8eP4Lw== 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=xHR8kZFDkaC8y1fxiiDOovfwwZswgXp35nQtQhl94jk=; b=lrG4CHIvpMrTSQYDKYHJcbcIm0WoIPncjLdY+Wy8ErUICJNDLHVA2w+DNFecUzYHsuNKCyIwDlZPOw/B4nKMS4Q3ci8cN+6GW27unfcfgMO5PJVk8igtRN2VYjvVUmR3LAT6MMlPCUQUMwqywKiNafqK8Hejya8Cwz8ek2ZEvB2NOt5Jha8GOGmWBrAmCA9y2CAMo6OeBB/BQLPbIcScqF967CkA3lHUTYLoVseWH0y4ysaquqTC9pZsSioTO0WI7YyqeIcpvD3Qfne1MedHhhNknybpriJ0Gsh7M1SalaZMt8pyNhYo0hxYSenQZpFpKwhwOVty+hia4JhWaBw6bQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Received: from PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) by CH0PR11MB5281.namprd11.prod.outlook.com (2603:10b6:610:bc::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7270.39; Mon, 12 Feb 2024 22:04:04 +0000 Received: from PH8PR11MB8107.namprd11.prod.outlook.com ([fe80::6257:f90:c7dd:f0b2]) by PH8PR11MB8107.namprd11.prod.outlook.com ([fe80::6257:f90:c7dd:f0b2%4]) with mapi id 15.20.7270.036; Mon, 12 Feb 2024 22:04:04 +0000 Date: Mon, 12 Feb 2024 14:04:00 -0800 From: Dan Williams To: Mathieu Desnoyers , Dan Williams , Arnd Bergmann , Dave Chinner CC: , Mathieu Desnoyers , Andrew Morton , Linus Torvalds , Vishal Verma , Dave Jiang , Matthew Wilcox , Russell King , , , , , , , , , Alasdair Kergon , Mike Snitzer , Mikulas Patocka Subject: RE: [PATCH v5 5/8] virtio: Treat alloc_dax() -EOPNOTSUPP failure as non-fatal Message-ID: <65ca95d086dfd_d2d429470@dwillia2-xfh.jf.intel.com.notmuch> References: <20240212163101.19614-1-mathieu.desnoyers@efficios.com> <20240212163101.19614-6-mathieu.desnoyers@efficios.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20240212163101.19614-6-mathieu.desnoyers@efficios.com> X-ClientProxiedBy: MW4PR03CA0213.namprd03.prod.outlook.com (2603:10b6:303:b9::8) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|CH0PR11MB5281:EE_ X-MS-Office365-Filtering-Correlation-Id: 1be25b9f-3e83-411c-42d7-08dc2c16866e 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:PH8PR11MB8107.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(366004)(136003)(396003)(39860400002)(346002)(376002)(230922051799003)(1800799012)(451199024)(64100799003)(186009)(2906002)(5660300002)(7416002)(41300700001)(26005)(83380400001)(8676002)(4326008)(8936002)(66556008)(66476007)(9686003)(66946007)(6512007)(6506007)(6666004)(54906003)(6486002)(316002)(966005)(110136005)(82960400001)(478600001)(86362001)(38100700002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?1ddJQdIs12P07B519/NThz9BKHR9mzL0yDu22aewE/zFuaoBDF/z3WPUU8ve?= =?us-ascii?Q?NZoJtWJP9DfE9oERDeyOtT9oeyjxLyB/MSxOx1eyA6QJcyy+mHmEM8cfkpT3?= =?us-ascii?Q?C+RCkz6rVLl0V7a4J+IIBJo+OpwQjb7l5Y9LWDdIkZ769tEidrfngY7vBvYf?= =?us-ascii?Q?XoaR/jFqHV8dBSzrCK/tXRCsZt79IlYOWoNr4EzZQ/j1M4FVIeJrBfZckVed?= =?us-ascii?Q?6N3L90XqCq4IJnuA4Q0G1srJfhbYLhD2RvXtyl5irwlAf1l/ZNH6NpeIGbEq?= =?us-ascii?Q?zr8hTOnPRmwV40wLKz/8uPPLbA9L5xoQaj8UqQ7jA7RUNYfG0gGe4sWUcDUY?= =?us-ascii?Q?giNpyzEDtPGCyv9K8/QXCe1dJwp4Jx5zwpdhEz1pxe7mCz75QtX7UeMsmbCx?= =?us-ascii?Q?DKXY9TiSPw/hOSoSWnmBDFwvIYxOwbFsvtxsuYC/ztzHYDutcBgMED6bNa6g?= =?us-ascii?Q?fi0dhFSr8zE0pFeoPqw0BHfq1HXkBANAGkbqHVysz5ndb9W4mJbjNdPG7ulL?= =?us-ascii?Q?DY3zhMwITtYIvRBW9BrMimCEs1z7zi2kLNfyiUfW8555ZB9HuXme7BG7MTnD?= =?us-ascii?Q?Kxwqz6c4cDJq89bt5pS25QdNzVjN3z++lp2kx2HrhMkblWE6BrzOrY0k/GRH?= =?us-ascii?Q?judI61JTqV5j7hga/jnePGM1hD8J8KYZH+mHxe9VRlqo+7RZFTpexN72f9q7?= =?us-ascii?Q?iyns0UJRig71f+vfmlM6T9t2SPgkEnSQaClwjpQWYpDfbCTjtWViMtxb75XD?= =?us-ascii?Q?LxKlQhCDT9Ag/uJ8q2DYNkYMa3TSCjwBPR0ZqI8y7U1ctlk3Aq/6TOPOytR3?= =?us-ascii?Q?H2DlutvuTONC/STw/0iPLw3AXftFE6VDFMDh5ulp+blj7/VwhdPz0e8zqK1C?= =?us-ascii?Q?4TIfGNhj9hrWbVso7SeevmHpnWSjM34nrvHFl5YMCuQeAYbXlHOeXrvNwLbH?= =?us-ascii?Q?8cU8MCXnZY5MgBI2aUIZO5mgn76RhxTS8QSvDqZDy21kj70pQKVWiZveG8Qs?= =?us-ascii?Q?dB7sal68osCLlMgB0daJb/OXmhQqCyfD3pbrCt8maNAcL2NtX1K9rD7vp/jj?= =?us-ascii?Q?Y8RsDsNr/LpTOTh2qfIatMkeTBKDAcbSLhDkLvzzh0ItW659R0EtHN+RC6HC?= =?us-ascii?Q?HZdbqYvx4p26nutTaqruiDx2aWbf2gWaUtLMbf03pvenaCtm8fdgYhOD0WPp?= =?us-ascii?Q?3O98VgeriU5JsIxL9rAWuhcZB0dgLqE04k94fBczlXXITqRBcSS0wnm/msPE?= =?us-ascii?Q?jKgAsDF/xCXUA8r3Rcjjm+lX4cRNTVjvh5Z4VjsZp4ezwBvb6TE1EMV0/CFy?= =?us-ascii?Q?FSte+17P+35ZhPToRvr7uyZdENa4TlkDy2zMz9jOjAwdG/d6gSvQzXiFV/FJ?= =?us-ascii?Q?fPvPLPtJpsH+qh8VOeqvBOqNin6dT5AWjUaNi6VfyjdFuZ+m/6Af54cbH8gz?= =?us-ascii?Q?LOHQpz4aGJEO7fet852tAJeXZg1KeMZMeO6tgVJf3jqjr43n3YQjGh4u7ST8?= =?us-ascii?Q?9xfsLLqX1U753vxhYJba+1hKs2dbKaMnuL8VhtQOnX9VPjFi/216poBpLufj?= =?us-ascii?Q?9c66MJVUiAIqXymbetU46Innj96cDy3tqoF+4rvLVehatXqNuGz8gw1jkhv3?= =?us-ascii?Q?Og=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: 1be25b9f-3e83-411c-42d7-08dc2c16866e X-MS-Exchange-CrossTenant-AuthSource: PH8PR11MB8107.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Feb 2024 22:04:03.8666 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: LSwCuhc300UhzBpkpV+yuW+BiADZHXHaDs766jYvZnwxnoljLYbv2wNVkZXc8Nhd+b4Jx1RyL9wrUASRBaBhP4JtWrVb+L37EIyoWtHdMk8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR11MB5281 X-OriginatorOrg: intel.com X-Rspamd-Queue-Id: 15E921A0025 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: c46b3s5o1htzemh5bg6y1mi16yrrq5pe X-HE-Tag: 1707775449-736576 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Mathieu Desnoyers wrote: > In preparation for checking whether the architecture has data cache > aliasing within alloc_dax(), modify the error handling of virtio > virtio_fs_setup_dax() to treat alloc_dax() -EOPNOTSUPP failure as > non-fatal. > > Co-developed-by: Dan Williams > Signed-off-by: Dan Williams > Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches") > Signed-off-by: Mathieu Desnoyers > Cc: Alasdair Kergon > Cc: Mike Snitzer > Cc: Mikulas Patocka > Cc: Andrew Morton > Cc: Linus Torvalds > Cc: Dan Williams > Cc: Vishal Verma > Cc: Dave Jiang > Cc: Matthew Wilcox > Cc: Arnd Bergmann > Cc: Russell King > Cc: linux-arch@vger.kernel.org > Cc: linux-cxl@vger.kernel.org > Cc: linux-fsdevel@vger.kernel.org > Cc: linux-mm@kvack.org > Cc: linux-xfs@vger.kernel.org > Cc: dm-devel@lists.linux.dev > Cc: nvdimm@lists.linux.dev > --- > fs/fuse/virtio_fs.c | 15 +++++++++++---- > 1 file changed, 11 insertions(+), 4 deletions(-) > > diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c > index 5f1be1da92ce..f9acd9972af2 100644 > --- a/fs/fuse/virtio_fs.c > +++ b/fs/fuse/virtio_fs.c > @@ -16,6 +16,7 @@ > #include > #include > #include > +#include > #include > #include "fuse_i.h" > > @@ -795,8 +796,11 @@ static void virtio_fs_cleanup_dax(void *data) > put_dax(dax_dev); > } > > +DEFINE_FREE(cleanup_dax, struct dax_dev *, if (!IS_ERR(_T)) virtio_fs_cleanup_dax(_T)) > + > static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs) > { > + struct dax_device *dax_dev __free(cleanup_dax) = ERR_PTR(-EOPNOTSUPP); > struct virtio_shm_region cache_reg; > struct dev_pagemap *pgmap; > bool have_cache; > @@ -804,6 +808,12 @@ static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs) > if (!IS_ENABLED(CONFIG_FUSE_DAX)) > return 0; > > + dax_dev = alloc_dax(fs, &virtio_fs_dax_ops); > + if (IS_ERR(dax_dev)) { > + int rc = PTR_ERR(dax_dev); > + return rc == -EOPNOTSUPP ? 0 : rc; > + } > + > /* Get cache region */ > have_cache = virtio_get_shm_region(vdev, &cache_reg, > (u8)VIRTIO_FS_SHMCAP_ID_CACHE); > @@ -849,10 +859,7 @@ static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs) > dev_dbg(&vdev->dev, "%s: window kaddr 0x%px phys_addr 0x%llx len 0x%llx\n", > __func__, fs->window_kaddr, cache_reg.addr, cache_reg.len); > > - fs->dax_dev = alloc_dax(fs, &virtio_fs_dax_ops); > - if (IS_ERR(fs->dax_dev)) > - return PTR_ERR(fs->dax_dev); > - > + fs->dax_dev = no_free_ptr(dax_dev); This works because the internals of virtio_fs_cleanup_dax(), "kill_dax() and put_dax()", know how to handle a NULL @dax_dev. It is still early days with the "cleanup" helpers, but I wonder if anyone else cares that the DEFINE_FREE() above does not check for NULL? I think it is ok, but wanted to point that out for the virtiofs folks and wonder what the style should be for things like this going forward. Other growing pains with "cleanup.h" and ERR_PTR is happening over here: http://lore.kernel.org/r/65ca861e14779_5a7f2949e@dwillia2-xfh.jf.intel.com.notmuch ...and that arrived at a similar style as is being used in this patch. In both cases the cleanup function is called on exit with a NULL argument.