On Tue, 07 Aug 2007 20:45:34 -0400
Trond Myklebust [off-list ref] wrote:

quoted

- rename something so that unconverted filesystems will reliably fail to
  compile?

- leave existing filesystems alone, but add a new
  inode_operations.setattr_jeff, which the networked filesytems can
  implement, and teach core vfs to call setattr_jeff in preference to
  setattr?

If you really need to know that the filesystem is handling the flags,
then how about instead having ->setattr() return something which
indicates which flags it actually handled? That is likely to be a far
more intrusive change, but it is one which is future-proof.

If we change ->setattr so that it will return a positive, non-zero value
which the caller can then check and reliably do printk("that filesystem
needs updating") then that addresses my concern, sure.