On Tue, Apr 29, 2025 at 02:22:11PM +0200, Christoph Hellwig wrote:

So I guess the property variant didn't work out based on the replies
from Darrick last round?

Correct.  Calling setxattr on the property wouldn't call
xfs_set_max_atomic_write_opt to change the operational limit, and I
don't want to start up the whole magic xattrs discussion again by making
xfs_xattr_set do extra things if name=="trusted.xfs:max_atomic_write".

(Though iirc you were the most opposed to magic xattrs, and my
opposition is 45% yuck factor and 55% "hch will nak it anyway" ;) )

--D