Plans for BTRFS in Fedora

Lennart Poettering mzerqung at
Thu Feb 24 13:25:26 UTC 2011

On Wed, 23.02.11 21:29, Chris Ball (cjb at wrote:

> Hi Lennart,
>    > My hope is that one day we can ship a read-only root dir by
>    > default, or more specifically a btrfs file system with three
>    > subvolumes in it: one read-only one mounted to /, and two
>    > writable ones mounted to /home and /var, with /tmp mounted from
>    > tmpfs.
> I can see the motivation for having root be read-only if you *aren't*
> using btrfs, but if we have a btrfs subvolume for the rootfs which is
> snapshotted every time we perform a package/admin operation (and
> perhaps also just on regular intervals for good measure), what would
> we then gain by adding a read-only rootfs to the mix?

Security, robustness: you can be sure that nothing tempers with your
basic OS tree and it is always in a defined state, unless put in a
specific "admin mode", where the image may be changed/administered,
i.e. / is remounted rw.


Lennart Poettering - Red Hat, Inc.

More information about the devel mailing list