From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Subject: Re: [PATCH v6 4/6] dax: check synchronous mapping is supported Date: Tue, 23 Apr 2019 16:27:23 +0200 Message-ID: <20190423142723.GD9910@quack2.suse.cz> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-5-pagupta@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20190423080612.15361-5-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" To: Pankaj Gupta Cc: cohuck-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, jack-AlSwsSmVLrQ@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, jasowang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org, qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org, virtualization-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, adilger.kernel-m1MBpc4rdrD3fQ9qLvQP4Q@public.gmane.org, zwisler-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, aarcange-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, david-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, willy-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, lenb-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, kilobyte-b9QjgO8OEXPVItvQsEIGlw@public.gmane.org, riel-ebMLmSuQjDVBDgjK7y7TUQ@public.gmane.org, yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, stefanha-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, lcapitulino-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, kwolf-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, nilal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, tytso-3s7WtUTddSA@public.gmane.org, xiaoguangrong.eric-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, darrick.wong-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-xfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, imammedo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Tue 23-04-19 13:36:10, Pankaj Gupta wrote: > This patch introduces 'daxdev_mapping_supported' helper > which checks if 'MAP_SYNC' is supported with filesystem > mapping. It also checks if corresponding dax_device is > synchronous. Virtio pmem device is asynchronous and > does not not support VM_SYNC. > > Suggested-by: Jan Kara > Signed-off-by: Pankaj Gupta The patch looks good to me. You can add: Reviewed-by: Jan Kara Honza > --- > include/linux/dax.h | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/include/linux/dax.h b/include/linux/dax.h > index c97fc0cc7167..41b4a5db6305 100644 > --- a/include/linux/dax.h > +++ b/include/linux/dax.h > @@ -41,6 +41,18 @@ void kill_dax(struct dax_device *dax_dev); > void dax_write_cache(struct dax_device *dax_dev, bool wc); > bool dax_write_cache_enabled(struct dax_device *dax_dev); > bool dax_synchronous(struct dax_device *dax_dev); > +/* > + * Check if given mapping is supported by the file / underlying device. > + */ > +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, > + struct dax_device *dax_dev) > +{ > + if (!(vma->vm_flags & VM_SYNC)) > + return true; > + if (!IS_DAX(file_inode(vma->vm_file))) > + return false; > + return dax_synchronous(dax_dev); > +} > #else > static inline struct dax_device *dax_get_by_host(const char *host) > { > @@ -68,6 +80,11 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) > { > return false; > } > +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, > + struct dax_device *dax_dev) > +{ > + return !(vma->flags & VM_SYNC); > +} > #endif > > struct writeback_control; > -- > 2.20.1 > -- Jan Kara SUSE Labs, CR 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=-8.4 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_MUTT autolearn=unavailable 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 5713BC10F14 for ; Tue, 23 Apr 2019 14:27:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2D5B121738 for ; Tue, 23 Apr 2019 14:27:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728024AbfDWO12 (ORCPT ); Tue, 23 Apr 2019 10:27:28 -0400 Received: from mx2.suse.de ([195.135.220.15]:42794 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726659AbfDWO11 (ORCPT ); Tue, 23 Apr 2019 10:27:27 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 8B5DAACB8; Tue, 23 Apr 2019 14:27:25 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 9F7B41E15B7; Tue, 23 Apr 2019 16:27:23 +0200 (CEST) Date: Tue, 23 Apr 2019 16:27:23 +0200 From: Jan Kara To: Pankaj Gupta Cc: linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-acpi@vger.kernel.org, qemu-devel@nongnu.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, dan.j.williams@intel.com, zwisler@kernel.org, vishal.l.verma@intel.com, dave.jiang@intel.com, mst@redhat.com, jasowang@redhat.com, willy@infradead.org, rjw@rjwysocki.net, hch@infradead.org, lenb@kernel.org, jack@suse.cz, tytso@mit.edu, adilger.kernel@dilger.ca, darrick.wong@oracle.com, lcapitulino@redhat.com, kwolf@redhat.com, imammedo@redhat.com, jmoyer@redhat.com, nilal@redhat.com, riel@surriel.com, stefanha@redhat.com, aarcange@redhat.com, david@redhat.com, david@fromorbit.com, cohuck@redhat.com, xiaoguangrong.eric@gmail.com, pbonzini@redhat.com, yuval.shaia@oracle.com, kilobyte@angband.pl Subject: Re: [PATCH v6 4/6] dax: check synchronous mapping is supported Message-ID: <20190423142723.GD9910@quack2.suse.cz> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-5-pagupta@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline In-Reply-To: <20190423080612.15361-5-pagupta@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Message-ID: <20190423142723.0c4-8UvsCHzucAESSjCPzjHT32b8911RBqkKoQ53QGk@z> On Tue 23-04-19 13:36:10, Pankaj Gupta wrote: > This patch introduces 'daxdev_mapping_supported' helper > which checks if 'MAP_SYNC' is supported with filesystem > mapping. It also checks if corresponding dax_device is > synchronous. Virtio pmem device is asynchronous and > does not not support VM_SYNC. > > Suggested-by: Jan Kara > Signed-off-by: Pankaj Gupta The patch looks good to me. You can add: Reviewed-by: Jan Kara Honza > --- > include/linux/dax.h | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/include/linux/dax.h b/include/linux/dax.h > index c97fc0cc7167..41b4a5db6305 100644 > --- a/include/linux/dax.h > +++ b/include/linux/dax.h > @@ -41,6 +41,18 @@ void kill_dax(struct dax_device *dax_dev); > void dax_write_cache(struct dax_device *dax_dev, bool wc); > bool dax_write_cache_enabled(struct dax_device *dax_dev); > bool dax_synchronous(struct dax_device *dax_dev); > +/* > + * Check if given mapping is supported by the file / underlying device. > + */ > +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, > + struct dax_device *dax_dev) > +{ > + if (!(vma->vm_flags & VM_SYNC)) > + return true; > + if (!IS_DAX(file_inode(vma->vm_file))) > + return false; > + return dax_synchronous(dax_dev); > +} > #else > static inline struct dax_device *dax_get_by_host(const char *host) > { > @@ -68,6 +80,11 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) > { > return false; > } > +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, > + struct dax_device *dax_dev) > +{ > + return !(vma->flags & VM_SYNC); > +} > #endif > > struct writeback_control; > -- > 2.20.1 > -- Jan Kara SUSE Labs, CR From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id B2342212108E4 for ; Tue, 23 Apr 2019 07:27:27 -0700 (PDT) Date: Tue, 23 Apr 2019 16:27:23 +0200 From: Jan Kara Subject: Re: [PATCH v6 4/6] dax: check synchronous mapping is supported Message-ID: <20190423142723.GD9910@quack2.suse.cz> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-5-pagupta@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190423080612.15361-5-pagupta@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: Pankaj Gupta Cc: cohuck@redhat.com, jack@suse.cz, kvm@vger.kernel.org, mst@redhat.com, jasowang@redhat.com, david@fromorbit.com, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, adilger.kernel@dilger.ca, zwisler@kernel.org, aarcange@redhat.com, linux-nvdimm@lists.01.org, david@redhat.com, willy@infradead.org, hch@infradead.org, linux-acpi@vger.kernel.org, linux-ext4@vger.kernel.org, lenb@kernel.org, kilobyte@angband.pl, riel@surriel.com, yuval.shaia@oracle.com, stefanha@redhat.com, pbonzini@redhat.com, lcapitulino@redhat.com, kwolf@redhat.com, nilal@redhat.com, tytso@mit.edu, xiaoguangrong.eric@gmail.com, darrick.wong@oracle.com, rjw@rjwysocki.net, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, imammedo@redhat.com List-ID: On Tue 23-04-19 13:36:10, Pankaj Gupta wrote: > This patch introduces 'daxdev_mapping_supported' helper > which checks if 'MAP_SYNC' is supported with filesystem > mapping. It also checks if corresponding dax_device is > synchronous. Virtio pmem device is asynchronous and > does not not support VM_SYNC. > > Suggested-by: Jan Kara > Signed-off-by: Pankaj Gupta The patch looks good to me. You can add: Reviewed-by: Jan Kara Honza > --- > include/linux/dax.h | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/include/linux/dax.h b/include/linux/dax.h > index c97fc0cc7167..41b4a5db6305 100644 > --- a/include/linux/dax.h > +++ b/include/linux/dax.h > @@ -41,6 +41,18 @@ void kill_dax(struct dax_device *dax_dev); > void dax_write_cache(struct dax_device *dax_dev, bool wc); > bool dax_write_cache_enabled(struct dax_device *dax_dev); > bool dax_synchronous(struct dax_device *dax_dev); > +/* > + * Check if given mapping is supported by the file / underlying device. > + */ > +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, > + struct dax_device *dax_dev) > +{ > + if (!(vma->vm_flags & VM_SYNC)) > + return true; > + if (!IS_DAX(file_inode(vma->vm_file))) > + return false; > + return dax_synchronous(dax_dev); > +} > #else > static inline struct dax_device *dax_get_by_host(const char *host) > { > @@ -68,6 +80,11 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) > { > return false; > } > +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, > + struct dax_device *dax_dev) > +{ > + return !(vma->flags & VM_SYNC); > +} > #endif > > struct writeback_control; > -- > 2.20.1 > -- Jan Kara SUSE Labs, CR _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:45221) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hIwOR-0000Nx-5e for qemu-devel@nongnu.org; Tue, 23 Apr 2019 10:27:32 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hIwOQ-0008FR-44 for qemu-devel@nongnu.org; Tue, 23 Apr 2019 10:27:31 -0400 Received: from mx2.suse.de ([195.135.220.15]:55142 helo=mx1.suse.de) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hIwOP-0008Du-Tv for qemu-devel@nongnu.org; Tue, 23 Apr 2019 10:27:30 -0400 Date: Tue, 23 Apr 2019 16:27:23 +0200 From: Jan Kara Message-ID: <20190423142723.GD9910@quack2.suse.cz> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-5-pagupta@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190423080612.15361-5-pagupta@redhat.com> Subject: Re: [Qemu-devel] [PATCH v6 4/6] dax: check synchronous mapping is supported List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Pankaj Gupta Cc: linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-acpi@vger.kernel.org, qemu-devel@nongnu.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, dan.j.williams@intel.com, zwisler@kernel.org, vishal.l.verma@intel.com, dave.jiang@intel.com, mst@redhat.com, jasowang@redhat.com, willy@infradead.org, rjw@rjwysocki.net, hch@infradead.org, lenb@kernel.org, jack@suse.cz, tytso@mit.edu, adilger.kernel@dilger.ca, darrick.wong@oracle.com, lcapitulino@redhat.com, kwolf@redhat.com, imammedo@redhat.com, jmoyer@redhat.com, nilal@redhat.com, riel@surriel.com, stefanha@redhat.com, aarcange@redhat.com, david@redhat.com, david@fromorbit.com, cohuck@redhat.com, xiaoguangrong.eric@gmail.com, pbonzini@redhat.com, yuval.shaia@oracle.com, kilobyte@angband.pl On Tue 23-04-19 13:36:10, Pankaj Gupta wrote: > This patch introduces 'daxdev_mapping_supported' helper > which checks if 'MAP_SYNC' is supported with filesystem > mapping. It also checks if corresponding dax_device is > synchronous. Virtio pmem device is asynchronous and > does not not support VM_SYNC. > > Suggested-by: Jan Kara > Signed-off-by: Pankaj Gupta The patch looks good to me. You can add: Reviewed-by: Jan Kara Honza > --- > include/linux/dax.h | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/include/linux/dax.h b/include/linux/dax.h > index c97fc0cc7167..41b4a5db6305 100644 > --- a/include/linux/dax.h > +++ b/include/linux/dax.h > @@ -41,6 +41,18 @@ void kill_dax(struct dax_device *dax_dev); > void dax_write_cache(struct dax_device *dax_dev, bool wc); > bool dax_write_cache_enabled(struct dax_device *dax_dev); > bool dax_synchronous(struct dax_device *dax_dev); > +/* > + * Check if given mapping is supported by the file / underlying device. > + */ > +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, > + struct dax_device *dax_dev) > +{ > + if (!(vma->vm_flags & VM_SYNC)) > + return true; > + if (!IS_DAX(file_inode(vma->vm_file))) > + return false; > + return dax_synchronous(dax_dev); > +} > #else > static inline struct dax_device *dax_get_by_host(const char *host) > { > @@ -68,6 +80,11 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) > { > return false; > } > +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, > + struct dax_device *dax_dev) > +{ > + return !(vma->flags & VM_SYNC); > +} > #endif > > struct writeback_control; > -- > 2.20.1 > -- Jan Kara SUSE Labs, CR 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=-8.4 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_MUTT autolearn=unavailable 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 74B28C10F14 for ; Tue, 23 Apr 2019 14:30:21 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4853821738 for ; 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Tue, 23 Apr 2019 10:27:30 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 8B5DAACB8; Tue, 23 Apr 2019 14:27:25 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 9F7B41E15B7; Tue, 23 Apr 2019 16:27:23 +0200 (CEST) Date: Tue, 23 Apr 2019 16:27:23 +0200 From: Jan Kara To: Pankaj Gupta Message-ID: <20190423142723.GD9910@quack2.suse.cz> References: <20190423080612.15361-1-pagupta@redhat.com> <20190423080612.15361-5-pagupta@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline In-Reply-To: <20190423080612.15361-5-pagupta@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x (no timestamps) [generic] X-Received-From: 195.135.220.15 Subject: Re: [Qemu-devel] [PATCH v6 4/6] dax: check synchronous mapping is supported X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: cohuck@redhat.com, jack@suse.cz, kvm@vger.kernel.org, mst@redhat.com, jasowang@redhat.com, david@fromorbit.com, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, adilger.kernel@dilger.ca, zwisler@kernel.org, aarcange@redhat.com, dave.jiang@intel.com, linux-nvdimm@lists.01.org, vishal.l.verma@intel.com, david@redhat.com, willy@infradead.org, hch@infradead.org, linux-acpi@vger.kernel.org, jmoyer@redhat.com, linux-ext4@vger.kernel.org, lenb@kernel.org, kilobyte@angband.pl, riel@surriel.com, yuval.shaia@oracle.com, stefanha@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, lcapitulino@redhat.com, kwolf@redhat.com, nilal@redhat.com, tytso@mit.edu, xiaoguangrong.eric@gmail.com, darrick.wong@oracle.com, rjw@rjwysocki.net, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, imammedo@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Message-ID: <20190423142723.PRwudwk9ucCvRjwPNEH8xjNv457Rf2zsa7fBpnl7SJo@z> On Tue 23-04-19 13:36:10, Pankaj Gupta wrote: > This patch introduces 'daxdev_mapping_supported' helper > which checks if 'MAP_SYNC' is supported with filesystem > mapping. It also checks if corresponding dax_device is > synchronous. Virtio pmem device is asynchronous and > does not not support VM_SYNC. > > Suggested-by: Jan Kara > Signed-off-by: Pankaj Gupta The patch looks good to me. You can add: Reviewed-by: Jan Kara Honza > --- > include/linux/dax.h | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/include/linux/dax.h b/include/linux/dax.h > index c97fc0cc7167..41b4a5db6305 100644 > --- a/include/linux/dax.h > +++ b/include/linux/dax.h > @@ -41,6 +41,18 @@ void kill_dax(struct dax_device *dax_dev); > void dax_write_cache(struct dax_device *dax_dev, bool wc); > bool dax_write_cache_enabled(struct dax_device *dax_dev); > bool dax_synchronous(struct dax_device *dax_dev); > +/* > + * Check if given mapping is supported by the file / underlying device. > + */ > +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, > + struct dax_device *dax_dev) > +{ > + if (!(vma->vm_flags & VM_SYNC)) > + return true; > + if (!IS_DAX(file_inode(vma->vm_file))) > + return false; > + return dax_synchronous(dax_dev); > +} > #else > static inline struct dax_device *dax_get_by_host(const char *host) > { > @@ -68,6 +80,11 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) > { > return false; > } > +static inline bool daxdev_mapping_supported(struct vm_area_struct *vma, > + struct dax_device *dax_dev) > +{ > + return !(vma->flags & VM_SYNC); > +} > #endif > > struct writeback_control; > -- > 2.20.1 > -- Jan Kara SUSE Labs, CR