From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f50.google.com ([74.125.82.50]:37486 "EHLO mail-wm0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753756AbcH1Dmm (ORCPT ); Sat, 27 Aug 2016 23:42:42 -0400 Received: by mail-wm0-f50.google.com with SMTP id i5so43638921wmg.0 for ; Sat, 27 Aug 2016 20:42:41 -0700 (PDT) Received: from ?IPv6:2a01:5c0:1c:b661:e56d:b3b3:8ef7:7c7d? ([2a01:5c0:1c:b661:e56d:b3b3:8ef7:7c7d]) by smtp.googlemail.com with ESMTPSA id u2sm6519353wmf.5.2016.08.27.20.42.39 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 27 Aug 2016 20:42:39 -0700 (PDT) To: linux-btrfs@vger.kernel.org From: Oliver Freyermuth Subject: btrfstune settings Message-ID: Date: Sun, 28 Aug 2016 05:42:39 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Dear btrfs experts, I hope this is the correct place to ask, the wiki and manpages did not help me on these questions. BTRFS has gained extended inode refs, skinny metadata and no-holes quite a while ago and these are now the defaults for new mkfs.btrfs. btrfstune can activate those features. However, I miss two things: - How do I see on an existing FS which of these features are on? btrfstune (it seems) can only "set", but not "get" the feature flags. - Is it worthwhile / recommended / safe to activate those on existing FS? Are there any steps (e.g. balancing metadata with -musage=0, I'd guess) needed to make them become active afterwards? If there is any documentation on this and I missed it, please RTFM me. Cheers and thanks a lot, Oliver