From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michel Alexandre Salim Subject: Separate mount options for subvolumes? Date: Mon, 14 Sep 2009 15:55:39 -0400 Message-ID: <615c05430909141255s614702deu44e42bbb7f7cd169@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 To: linux-btrfs list Return-path: List-ID: Hello, It is my understanding that currently, the only difference between subvolumes and snapshots are that snapshots share a root with an existing tree, while subvolumes start off empty. There is an interesting use case difference, though: because a subvolume by definition cannot share data with other subvolumes, that frees it up to being mounted with different options (e.g. nodatasum, nodatacow). The reason I'm wondering is that I just switched my home directory to btrfs, and one of my machine is often used for rebuilding RPMs (for initial testing, before getting it built on a build server). The data is never kept for a long time, and so checksumming and COW would just slow things down. Would this be possible, and if so, is it planned for implementation by 1.0? Thanks, -- Michel Alexandre Salim