rio: huge simplification of flush handling

xfidflush() now uses a simpler way to flush another xfid.

when we can send to Xfid.c channel, we know that the
xfid is completed. so all xfidflush() needs todo is to
do an alt sending to both Xfid.c and Xfid.flushc.

once the send to Xfid.c succeeds, we know the xfid is gone
and we can respond to the flush request.

theres no need to keep track of flush state anymore. so
Xfid.active and Xfid.flushing can be removed.

note, that it is ok to respond normally to a currently
flushed request.

0 files changed, 0 insertions, 0 deletions