From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from resqmta-po-07v.sys.comcast.net ([96.114.154.166]:36116 "EHLO resqmta-po-07v.sys.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750812AbaJWW1I (ORCPT ); Thu, 23 Oct 2014 18:27:08 -0400 Message-ID: <544980BA.8080007@pobox.com> Date: Thu, 23 Oct 2014 15:27:06 -0700 From: Robert White MIME-Version: 1.0 To: Btrfs BTRFS Subject: Mounting(multiply)? Options(stored)? Options(barriers)? Content-Type: text/plain; charset=utf-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: I've got several questions about mount features that I've been unable to find definitive answers for. ITEM: So there are some mount options that I'd like to be able to pin onto a media like compress=lzo on a thumb drive I expect to get crowded. Is there a feature equivalent to the -o option to tune2fs either present or planned? ITEM: Is there a means (or a plan for a means) to use a subvol as a means to prevent/change active features from propigating to a subdirectory? An example would be a means to turn off autodefrag or compression for a subvolume full of virtual machine images, whilest having it active for the bulk of the filesystem. ITEM: If I make one file system and have subvols /__System /home and /VMs and mount those as / /home and /usr/local/VMs respectively, with differing feature options for each, will those options be separately honored or will the last-mounted or first-mounted subvolume's options take dominant effect? Compression, auto-defragment, and commit interval being of primary concern. ITEM: Is there a no-compress attribute (or something similar) for negating compress= mount options on specific files or directories? How about a no-autodefrag? (I'm about to set up a system and some standards that may last many years and I'm trying to find the reasonable bounds of where I need to do hard partitioning.) --Rob.