Re: btrfs and mount in gentoo linux

["Stefan G. Weichinger" <lists@xunil.at>]

Am 09.07.2014 03:57, schrieb Qu Wenruo:

>> The "[/rootfs]" is something in the right direction ...
> The bug is that, if you don't use 'subvol=' mount option but use default
> subvolume or 'subvolid=' mount option,
> findmnt will not give the output.

Yes, that sounds true as I switched to mostly using 'subvolid=' over
times. I also use that in my fstab.

> Since 'subvol=' mount option differs from default subvolume mount or
> 'subvolid=' mount option in calling behavior,
> 'subvol=' uses mount_subtree() vfs call, which records subtree mount info.
> On the other hand, default subvolume mount or 'subvolid=' mount does not
> go through the vfs subtree mount
> but use btrfs's implement, which does not report vfs submount.

OK, good explanation ;-)

> I'll try to investigate further and find whether we can fix it to show
> more info.

Thanks a lot, I think this would be a more expectable behavior in the end.

Stefan