On Tue, 2012-12-11 at 15:40 -0500, Gene Czarcinski wrote:
> On 12/11/2012 01:56 PM, David Lehman wrote:
> > On Tue, 2012-12-11 at 07:33 -0500, Gene Czarcinski wrote:
> >> On 12/11/2012 07:10 AM, Gene Czarcinski wrote:
> >>> On 12/10/2012 06:37 PM, Adam Williamson wrote:
> >>>> On Mon, 2012-12-10 at 16:22 -0700, Chris Murphy wrote:
> >>>>
> >>>>>>> 3. Handle predefined pools and subvolumes.
> >>>>>> This is working in current (post-beta) versions.
> >>>>> Where are these versions? I'm not seeing anything newer than 18.37
> >>>>> in koji.
> >>>> That is the latest post-Beta build. Anything after 18.29.2 is post-Beta.
> >>>> TC1 contains 18.36, IIRC. 18.37 seems to have one or two significant
> >>>> regressions from 18.36.
> >>> So, are you saying that if I use TC1, it should work for btrfs?
> >>>
> >>> For subvolumes which I want to use as is such as /home, I can see
> >>> things working. But, for a subvolume where the corresponding LVM
> >>> function would be to reformat (such as might be needed for root), is
> >>> that really there too?
> >> Sorry, but I consider that with TC1 (DVD), btrfs and subvolumes are not
> >> working.
> >>
> >> 1. You can add an existing subvolume such as /home.
> >>
> >> 2. You cannot use an existing btrfs subvolume for root ("/") even if it
> >> is "empty".
> > And that's how it's going to stay, too. You have to create a new
> > filesystem for root regardless of device/fs type, and this is the
> > closest analogue for btrfs subvolumes (create new subvolume being the
> > only reasonable way to get a fresh tree with btrfs aside from creating a
> > new volume).
> I very much understand. BTRFS is very different from LVM or regular
> partitions. There is no simple way to tell that a subvolume is "empty."
> >
> >> 3. You cannot create a new subvolume in an existing btrfs pool.
> > Right. The btrfs-specific pieces for this aren't hooked up as I
> > mentioned before. Incidentally, you should be able to add a subvolume if
> > your disks are fully occupied and there is an existing btrfs volume.
> > There just isn't any UI to switch them around from volume to volume,
> > yet.
> >
> OK, so if there is no free space on a disk, all of the defined regular
> partitions, LVs, and subvolumes are on defined mount points, but there
> is free space in a BTRFS pool, then it should let me create a new "root"
> subvolume.
>
> Is that correct?
>
> BTW, I am also puzzling this out with kickstart. Everything is fine if
> I freshly format the BTRFS partition and then allocate some subvolumes
> but I have not figured out how to add a new subvolume to an existing
> pool? Any hints?
This should work:
btrfs /whatever --subvol --name=whatever UUID=<uuid_of_existing_vol>
See https://fedoraproject.org/wiki/Anaconda/Kickstart#btrfs if you
haven't already found it.
>
> Gene
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