On Tue, Sep 22, 2015 at 01:56:53AM +0300, Mika Eloranta wrote: > On 22 Sep 2015, at 01:18, Dave Chinner <david@xxxxxxxxxxxxx> > wrote: > > > > On Mon, Sep 21, 2015 at 08:04:20PM +0300, Mika Eloranta wrote: > >> The UUID can now be optionally specified during filesystem > >> creation. > > > > Which UUID are you wanting to set - the metadata uuid or the > > user visible UUID label? Or both? Can you explain the use case > > for this? i.e. I'm trying to work out why Why doesn't mkfs.xfs > > + xfs_admin -U <uuid> doesn't work for you? > > I want to set the user visible UUID (same as xfs_admin -U/-u). > Whether this impacts the "metadata uuid” or not, I do not > know, I’m not an expert on the XFS internals, just a user. Which tells me what I need to know - You are trying to use the UUID as a user controlled filesystem label. Funnily enough, we have a thing for this already - a user controlled filesystem label: # mkfs.xfs -L "label" .... It's 12 characters long, so more than enough for any sort of unique identification scheme you want to use for your filesystems. xfs_admin enables you to change it after the fact, all major filesystems support it and all the infrastructure know about it (lsblk, /etc/fstab. /dev/disk/by-label, etc) so using it is no different to using UUIDs. Except that, unlike UUIDs, you can make fileystem labels human readable. :) Perhaps you should try using filesystem labels seeing as everything you need is already there? Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
