[PATCH] xfs: in _attrlist_by_handle, copy the cursor back to userspace

[Darrick J. Wong]

On Tue, Aug 02, 2016 at 05:25:17AM -0700, Christoph Hellwig wrote:
> On Mon, Aug 01, 2016 at 08:56:51PM -0700, Darrick J. Wong wrote:
> > When we're iterating inode xattrs by handle, we have to copy the
> > cursor back to userspace so that a subsequent invocation actually
> > retrieves subsequent contents.
> 
> Testcase?

Found it while continuing development of xfs_scrub.  I'll send along the
xfstest patch when I've finished polishing it.  (It was harder than usual since
xfs_io doesn't /use/ the attr-by-handle interface... nothing does.)

--D