[dm-devel] [PATCH] dm-mpath: requeue I/O during pg_init

[Alasdair G Kergon]

On Tue, Nov 05, 2013 at 02:10:55PM +0100, Hannes Reinecke wrote:
> If this is just a left-over from the original port to request-based
> (for bio-based we _have_ to queue internally as there's no request
> queue to be had), fine, we should be removing it.

I think that is the case.

> But there _might_ be some corner cases which require us to do internal
> queueing.
 
We *only* add I/O to the internal queue in map_io() - which can always
be replaced with REQUEUE,  As long as we still 'wake up' the queue
immediately when we are ready to receive the I/O, I can't think of any
other reason.  And it would let us remove quite a bit of tricky code!

> Junichi, could you share some light here?
 
Alasdair