Re: [RFE] xfs_growfs: option to clamp growth to an AG boundary

["Darrick J. Wong" <djwong@kernel.org>]

On Tue, Feb 24, 2026 at 07:02:32AM -0800, Christoph Hellwig wrote:
> On Mon, Feb 23, 2026 at 02:48:48PM +0500, Марк Коренберг wrote:
> > This feels like something xfsprogs could support directly. My proposals:
> 
> I like your proposal.  This is actually a relatively east project,
> and I've happy to mentor whomever wants to take it up.  Although
> I think json output while generally useful is probably a separate
> issue and should be addressed separately and in a more general
> fashion.

I've long thought it might be useful to have an xfs_db command that
could spit out a mkfs config file for a given filesystem, so you could
just do:

# xfs_db -c 'mkfs_config' /dev/sda1 > /tmp/foo.cfg
# mkfs.xfs -c /tmp/foo.cfg -f /dev/sdb1

and then sdb1 gets whatever featureset sda1 had.  The reason I never
pursued this is that I don't know how much we'd really want to preserve.
User-visible features, yes.  But what about geometry things like group
size, volume size, or RAID stripe parameters?

--D