On Wed, Feb 13, 2019 at 6:32 PM Martin K. Petersen
[off-list ref] wrote:

Evan,

quoted

Properly plumb out EOPNOTSUPP from loop driver operations, which may
get returned when for instance a discard operation is attempted but
not supported by the underlying block device. Before this change,
everything was reported in the log as an I/O error, which is scary and
not helpful in debugging.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

Hi Jens,
I think this one at least is ready to go.
-Evan