The existing cleanup code would silently cancel disk IO requests, if
somehow the calling code did not wait for completion. This code now
tracks requests and will bug if any are lost.
Signed-off-by: Justin Husted <sigstop@gmail.com>
The shutdown code in d79d57e and b20e160 had a race condition during
shutdown, due to not owning a reference on the associated task_struct
while the associated threads shut themselves down.
Patch over this by taking an appropriate reference.
Signed-off-by: Justin Husted <sigstop@gmail.com>
