From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from userp1040.oracle.com ([156.151.31.81]:21740 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751028AbbLUFTS (ORCPT ); Mon, 21 Dec 2015 00:19:18 -0500 Subject: Re: Ideas to do custom operation just after mount? References: <56721602.5050204@cn.fujitsu.com> <20151221001654.GM19802@dastard> <56776330.1090500@cn.fujitsu.com> <5677662F.2060806@cn.fujitsu.com> From: Anand Jain Message-ID: <56778B9E.8050900@oracle.com> Date: Mon, 21 Dec 2015 13:18:22 +0800 MIME-Version: 1.0 In-Reply-To: <5677662F.2060806@cn.fujitsu.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: fstests-owner@vger.kernel.org To: Qu Wenruo Cc: Dave Chinner , fstests@vger.kernel.org, btrfs List-ID: > BTW, any good idea for btrfs to do such operation like > enabling/disabling some minor features? Especially when it can be set on > individual file/dirs. > > Features like incoming write time deduplication, is designed to be > enabled/disabled for individual file/dirs, so it's not a quite good idea > to use mount option to do it. > > Although some feature, like btrfs quota(qgroup), should be implemented > by mount option though. > I don't understand why qgroup is enabled/disabled by ioctl. :( mount option won't persist across systems/computers unless remembered by human. Thanks, Anand