From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-130.freemail.mail.aliyun.com (out30-130.freemail.mail.aliyun.com [115.124.30.130]) (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 84D822D12ED for ; Wed, 13 May 2026 06:58:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.130 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778655487; cv=none; b=exXEE01asOMBHXwMuXn2Q7bnB9pIxAeq1Pjczih8Lc43kIVw4Amq9edlJKSvAGIiBEMfoA6NRk8xNKHKiLuyx7yWDJTj921nHOZfwK9DOqtQOONZRC++FzUwLjtL2RMrjwTJCL6qLWPA1vBd+TyN4vceyR2AAm3K7IcRneHwgoE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778655487; c=relaxed/simple; bh=AknfT6DOvNis5ZvNGkVKzRf4gJ8SGhx5DmaESprlZB8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=XtKv/iLTSNazC4+AaBlXMw6LUM1zEdGIuGE4QY2MFmS71zVu2GPd+KSxKuYVZM223uMf0/7lOvmDoEN9kdcsD3A5GYGVuV622cwGffP85Qm/49KoiQaBtAHQNPCSHdJQM3bRl1b2Bvohyz0NS2ufU+48z6J5xwN18iw8q6oms3s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=dHi3+ung; arc=none smtp.client-ip=115.124.30.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="dHi3+ung" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1778655480; h=Message-ID:Date:MIME-Version:Subject:To:From:Content-Type; bh=hnMM+47wijWEsiSC/Rp2YSplBxkVNxtL2pqSMMI2mHU=; b=dHi3+ungoee4ug8VGL+PTDK/7G3r7Hxjqqjc6Pzn89SGS2SpBNp443fNJPOVI1CnEbe5SMf8tsP/8qQPN/aOVnztUk3/y3FyFcAJ1QryvSslf3LIOfyf5y8w1CyQz0/mg7yHcH8gspBYuOMRJYWrOs09BUjytvSZULBvxMd2pKk= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R111e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033045098064;MF=hsiangkao@linux.alibaba.com;NM=1;PH=DS;RN=10;SR=0;TI=SMTPD_---0X2svuPR_1778655479; Received: from 30.120.66.214(mailfrom:hsiangkao@linux.alibaba.com fp:SMTPD_---0X2svuPR_1778655479 cluster:ay36) by smtp.aliyun-inc.com; Wed, 13 May 2026 14:57:59 +0800 Message-ID: Date: Wed, 13 May 2026 14:57:58 +0800 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [post LSFMM summary] where is fuse going? To: Amir Goldstein , Miklos Szeredi Cc: fuse-devel , linux-fsdevel@vger.kernel.org, John Groves , Joanne Koong , "Darrick J . Wong" , Bernd Schubert , Horst Birthelmer , Luis Henriques References: <943cb464-78f3-44a7-92a7-57a1fe4fbc10@linux.alibaba.com> From: Gao Xiang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 2026/5/13 05:40, Amir Goldstein wrote: > On Tue, May 12, 2026 at 12:01 PM Miklos Szeredi wrote: >> >> On Tue, 12 May 2026 at 09:53, Amir Goldstein wrote: >> >>> The problem is only with fuse_passthrough_mmap(). >>> Depending on the workload (?) mmap may not be important and >>> we could fail if trying to map cross-backing-id regions. >> >> mmap(2) is the main entry point into famfs, so it's very important. >> >> That doesn't work with "traditional" passthrough and needs to do the >> DAX mapping that famfs currently does. >> > > Yes, famfs surely needs mmap to multiple daxdev and this is done. > > I was referring to Gao's question about dealing with non-dax multi > backing id (const mapped) files. Yes, it can work on DAX and my question was all about mmap backed by multiple pagecache-backed files. Thanks, Gao Xiang > > Thanks, > Amir.