On Thu, Oct 06, 2016 at 02:51:58PM +0100, Tim Small wrote:
> Hello,
>
> I use btrfs for containers (e.g. full OS style containers using lxc/lxd
> etc. rather than application containers). btrfs de-duplication and
> send/receive are very useful features for this use-case.
>
> Each container runs in its own subvolume, and I use quotas to stop one
> container exhausting the disk space of the others.
>
> df shows the total space + free space for the entire filesystem - which
> is confusing for users within the containers. Worse - they don't have
> any way of knowing how much quota they actually have left (other than du
> -xs / vs. whatever I've told them).
>
> It'd be really nice if running e.g. statfs("/home", ...) within a
> container could be made to return the qgroup usage + limit for the path
> (e.g. by passing in an option at mount time - such as qgroup level
> maybe?) , instead of the global filesystem data in f_bfree f_blocks etc.
XFS does this with directory tree quotas. It was implmented 10 years
ago or so, IIRC...
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
