From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 588541DE3DC; Mon, 26 Jan 2026 19:16:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769455016; cv=none; b=KlYUcgCfEHB+R1FXJ2bAF9zVj61PpiLsAWMJtzhD5mxOJvhnlgy+R4yu04jw/9J6TCBZUTjYLHzNBgCTyIf8+qsIPAXYT8PB983No7mvuPrW/b4H6AGQ+FBXUCrNgvngFS+WHBlp/OG3TKrXKv0JfuY0hppHmObbNR41tS7csFs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769455016; c=relaxed/simple; bh=YCY0ffj1SdQo4GMFAbxGXa4s96vFKDUPsIOH/Mkrh9o=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=p17SxhLE/xcJ3Aj82+Cl48SIPo0aXGSrsBNa0jJnMaXTgBrbSTtnpVawXfagww37+jG3MNJrn8u+XQebKhZTqw3QHrdKqLGHA1bFwxiof+vx9/6xL9FS301ssolBEgPCpn3AuB+aoYwW2u025BLV64sMtr8eqNu97uJRTsXOkMw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=n21P7Beg; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="n21P7Beg" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=rMO2xX5xP28Q60xOnHu+vXD5aA6ESMshNUI0W1W6UHw=; b=n21P7BegJ2WRIBtQlJooTVh9Lv 9qFMD4jFHFi5XLAdogjd7y5b9kzy5uKXUh1V4E8B8NVyixXLt5FOfj8pWW2wO0SmvIdmWs0pPzVSa CvtXf9tIrxNjnIoXVBdgqmGh61ymkcIqIV9sdQToF3R3UqFSitcK0SB9nnWVkSo8I+UcBwA+k8L/j Ed09wbguCxvSghmXBEHmM0N366SuB1gGgbEEd7xGC1KOMSgGwHJf869Eg7m/nKrf0Gf+SeTKDg27T gYWcl/t8UXdtRkf9prJF8CFP6hxeiO3uMG5GhTFobCui0ibGRs/vHCucAUcbSwW0XDA1dpmVslQdf BgugbjAw==; Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1vkS4s-00000006MVP-1o4U; Mon, 26 Jan 2026 19:16:46 +0000 Date: Mon, 26 Jan 2026 19:16:46 +0000 From: Matthew Wilcox To: Cong Wang Cc: Gao Xiang , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Cong Wang , multikernel@lists.linux.dev Subject: Re: [ANNOUNCE] DAXFS: A zero-copy, dmabuf-friendly filesystem for shared memory Message-ID: References: <55e3d9f6-50d2-48c0-b7e3-fb1c144cf3e8@linux.alibaba.com> Precedence: bulk X-Mailing-List: multikernel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, Jan 26, 2026 at 09:38:23AM -0800, Cong Wang wrote: > If you are interested in adding multikernel support to EROFS, here is > the codebase you could start with: > https://github.com/multikernel/linux. PR is always welcome. I think the onus is rather the other way around. Adding a new filesystem to Linux has a high bar to clear because it becomes a maintenance burden to the rest of us. Convince us that what you're doing here *can't* be done better by modifying erofs. Before I saw the email from Gao Xiang, I was also going to suggest that using erofs would be a better idea than supporting your own filesystem. Writing a new filesystem is a lot of fun. Supporting a new filesystem and making it production-quality is a whole lot of pain. It's much better if you can leverage other people's work. That's why DAX is a support layer for filesystems rather than its own filesystem.