From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from a.ns.miles-group.at ([95.130.255.143]:11950 "EHLO radon.swed.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759324AbcAUMpu (ORCPT ); Thu, 21 Jan 2016 07:45:50 -0500 Subject: Re: [PATCH v4] fuse: Add support for passthrough read/write To: Bernd Schubert , Nikhilesh Reddy , torvalds@linux-foundation.org, Miklos Szeredi , fuse-devel , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, gregkh@linuxfoundation.org, linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, Richard Weinberger , Theodore Ts'o , jack@suse.cz, Antonio SJ Musumeci , sven.utcke@gmx.de, Nikolaus Rath , Jann Horn References: <56A0235E.8090205@codeaurora.org> <56A0D148.7080508@fastmail.fm> From: Richard Weinberger Message-ID: <56A0D2F8.4020004@nod.at> Date: Thu, 21 Jan 2016 13:45:44 +0100 MIME-Version: 1.0 In-Reply-To: <56A0D148.7080508@fastmail.fm> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Am 21.01.2016 um 13:38 schrieb Bernd Schubert: > On 01/21/2016 01:16 AM, Nikhilesh Reddy wrote: >> Add support for filesystem passthrough read/write of files >> when enabled in userspace through the option FUSE_PASSTHROUGH. >> >> There are many FUSE based filesystems that perform checks or >> enforce policy or perform some kind of decision making in certain >> functions like the "open" call but simply act as a "passthrough" >> when performing operations such as read or write. >> >> When FUSE_PASSTHROUGH is enabled all the reads and writes >> to the fuse mount point go directly to the passthrough filesystem >> i.e a native filesystem that actually hosts the files rather than >> through the fuse daemon. All requests that aren't read/write still >> go thought the userspace code. >> >> This allows for significantly better performance on read and writes. >> The difference in performance between fuse and the native lower >> filesystem is negligible. >> >> There is also a significant cpu/power savings that is achieved which >> is really important on embedded systems that use fuse for I/O. >> >> Signed-off-by: Nikhilesh Reddy > > I think it is common style to add a change log between patch set > versions in the patch description. And please slow down a bit. Collect a few review comments and then do another version of your patch. :-) Thanks, //richard