On Tue, Jan 05, 2016 at 02:53:37PM -0600, mchristi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org wrote:

From: Mike Christie <redacted>

The last patch added a REQ_OP_FLUSH for request_fn drivers
and the next patch renames REQ_FLUSH to REQ_PREFLUSH which
will be used by file systems and make_request_fn drivers.

This leaves REQ_FLUSH/REQ_FUA defined for drivers to tell
the block layer if flush/fua is supported. The names are
confusing and I bet will will accidentally be used by
people to request flushes. To avoid that, this patch adds
QUEUE_FLAGs for flush and fua which drivers will use to
indicate what they support.

Signed-off-by: Mike Christie <redacted>

Yes, this was rather confusing before.  Looks great fix the fix for th
kbuild complaint:

Reviewed-by: Christoph Hellwig <redacted>