Re: [PATCH] mkfs: use stx_blksize for dev block size by default

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

On Thu, Feb 06, 2025 at 02:50:28PM -0800, Luis Chamberlain wrote:
> On Thu, Feb 06, 2025 at 02:27:16PM -0800, Darrick J. Wong wrote:
> > Now you've decreased the default blocksize to 512 on sda, and md0 gets
> > an impossible 512k blocksize.  Also, disrupting the default 4k blocksize
> > will introduce portability problems with distros that aren't yet
> > shipping 6.12.
> 
> Our default should be 4k, and to address the later we should sanity
> check and user an upper limit of what XFS supports, 64k.

I don't think it's a good idea to boost the default fsblock size beyond
4k until we get further into the era where the major distros are
shipping 6.12 kernels.  I wouldn't want to deal with people accidentally
ending up with an 8k fsblock filesystem that they can't mount on fairly
new things like RHEL9/Debian12/etc.

--D

> Thoughts?
> 
>  Luis
>