On Mon, Sep 14, 2009 at 03:55:39PM -0400, Michel Alexandre Salim
wrote:> 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?
It would be possible, and long term we plan on storing a number of
options directly in the root so that you don''t have to keep doing mount
-o foo.
-chris
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