block/io: turn on dirty_bitmaps for the compressed writes

block/io: turn on dirty_bitmaps for the compressed writes

Previously was added the assert:

  commit 1755da16e32c15b22a521e8a38539e4b5cf367f3
  Author: Paolo Bonzini <pbonzini@redhat.com>
  Date:   Thu Oct 18 16:49:18 2012 +0200
  block: introduce new dirty bitmap functionality

Now the compressed write is always in coroutine and setting the bits is
done after the write, so that we can return the dirty_bitmaps for the
compressed writes.

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Jeff Cody <jcody@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
CC: Eric Blake <eblake@redhat.com>
CC: John Snow <jsnow@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>