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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73C34C433EF for ; Wed, 20 Oct 2021 14:54:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 56CAE61373 for ; Wed, 20 Oct 2021 14:54:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229691AbhJTO46 (ORCPT ); Wed, 20 Oct 2021 10:56:58 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:47878 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230288AbhJTO4z (ORCPT ); Wed, 20 Oct 2021 10:56:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1634741680; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=tgE2v2Xnx6r21tk2BxNtk6orIWAwsfp90xFetVt70ME=; b=YtF1LotrqHFYTjuBScOt5kWFU9J/etMAdrlmyYqgVL6S2Ey12b232UWnnPFMub8lTMmTKh IoFBIgth4RLMT9/fVo8i1FexT2Ld47Anjkje+eTHF/hsDKS5dIDzy6G7jq3BoFn43HN/Vs FgWsFoQVsT/DnapKTEfIofIO2SDMITI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-106-5lsgAGszNYGlIoEf79lyNA-1; Wed, 20 Oct 2021 10:54:36 -0400 X-MC-Unique: 5lsgAGszNYGlIoEf79lyNA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 85A4280A5C3; Wed, 20 Oct 2021 14:54:35 +0000 (UTC) Received: from horse.redhat.com (unknown [10.22.33.105]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0802060FDD; Wed, 20 Oct 2021 14:54:15 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 7E7DE2256F8; Wed, 20 Oct 2021 10:54:15 -0400 (EDT) Date: Wed, 20 Oct 2021 10:54:15 -0400 From: Vivek Goyal To: JeffleXu Cc: stefanha@redhat.com, miklos@szeredi.hu, linux-fsdevel@vger.kernel.org, virtio-fs@redhat.com, bo.liu@linux.alibaba.com, joseph.qi@linux.alibaba.com Subject: Re: [PATCH v6 3/7] fuse: support per-file DAX in fuse protocol Message-ID: References: <20211011030052.98923-1-jefflexu@linux.alibaba.com> <20211011030052.98923-4-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Wed, Oct 20, 2021 at 11:04:03AM +0800, JeffleXu wrote: > > > On 10/18/21 10:20 PM, Vivek Goyal wrote: > > On Mon, Oct 18, 2021 at 10:14:04AM -0400, Vivek Goyal wrote: > >> On Mon, Oct 11, 2021 at 11:00:48AM +0800, Jeffle Xu wrote: > >>> Expand the fuse protocol to support per-file DAX. > >>> > >>> FUSE_PERFILE_DAX flag is added indicating if fuse server/client > >> > >> Should we call this flag FUSE_INODE_DAX instead? It is per inode property? > >> > > Yes, strictly specking, 'per-file' is not correct. > > > > > I realized that you are using FUSE_DAX_INODE to represent dax mode. So it > > will be confusing to use FUSE_INODE_DAX as protocol flag. How about > > FUSE_INODE_DAX_STATE instead? > > > > Emmm, the "_STATE" suffix is not straightforward and clear to me. How > about FUSE_HAS_INODE_DAX or FUSE_DO_INODE_DAX, referring to the existing > 'FUSE_HAS_IOCTL_DIR' and 'FUSE_DO_READDIRPLUS'? FUSE_HAS_INODE_DAX or FUSE_DO_INODE_DAX are fine. Vivek > > > >> > >>> supporting per-file DAX. It can be conveyed in both FUSE_INIT request > >>> and reply. > >>> > >>> FUSE_ATTR_DAX flag is added indicating if DAX shall be enabled for > >>> corresponding file. It is conveyed in FUSE_LOOKUP reply. > >>> > >>> Signed-off-by: Jeffle Xu > >>> --- > >>> include/uapi/linux/fuse.h | 9 ++++++++- > >>> 1 file changed, 8 insertions(+), 1 deletion(-) > >>> > >>> diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h > >>> index 36ed092227fa..15a1f5fc0797 100644 > >>> --- a/include/uapi/linux/fuse.h > >>> +++ b/include/uapi/linux/fuse.h > >>> @@ -184,6 +184,9 @@ > >>> * > >>> * 7.34 > >>> * - add FUSE_SYNCFS > >>> + * > >>> + * 7.35 > >>> + * - add FUSE_PERFILE_DAX, FUSE_ATTR_DAX > >>> */ > >>> > >>> #ifndef _LINUX_FUSE_H > >>> @@ -219,7 +222,7 @@ > >>> #define FUSE_KERNEL_VERSION 7 > >>> > >>> /** Minor version number of this interface */ > >>> -#define FUSE_KERNEL_MINOR_VERSION 34 > >>> +#define FUSE_KERNEL_MINOR_VERSION 35 > >>> > >>> /** The node ID of the root inode */ > >>> #define FUSE_ROOT_ID 1 > >>> @@ -336,6 +339,7 @@ struct fuse_file_lock { > >>> * write/truncate sgid is killed only if file has group > >>> * execute permission. (Same as Linux VFS behavior). > >>> * FUSE_SETXATTR_EXT: Server supports extended struct fuse_setxattr_in > >>> + * FUSE_PERFILE_DAX: kernel supports per-file DAX > >>> */ > >>> #define FUSE_ASYNC_READ (1 << 0) > >>> #define FUSE_POSIX_LOCKS (1 << 1) > >>> @@ -367,6 +371,7 @@ struct fuse_file_lock { > >>> #define FUSE_SUBMOUNTS (1 << 27) > >>> #define FUSE_HANDLE_KILLPRIV_V2 (1 << 28) > >>> #define FUSE_SETXATTR_EXT (1 << 29) > >>> +#define FUSE_PERFILE_DAX (1 << 30) > >>> > >>> /** > >>> * CUSE INIT request/reply flags > >>> @@ -449,8 +454,10 @@ struct fuse_file_lock { > >>> * fuse_attr flags > >>> * > >>> * FUSE_ATTR_SUBMOUNT: Object is a submount root > >>> + * FUSE_ATTR_DAX: Enable DAX for this file in per-file DAX mode > >>> */ > >>> #define FUSE_ATTR_SUBMOUNT (1 << 0) > >>> +#define FUSE_ATTR_DAX (1 << 1) > >>> > >>> /** > >>> * Open flags > >>> -- > >>> 2.27.0 > >>> > > -- > Thanks, > Jeffle >