On Tue, 24 Feb 2004 10:03:56, Joe Thornber wrote: > On Tue, Feb 24, 2004 at 01:21:16AM +0100, Miquel van Smoorenburg wrote: > > All in all, I think that the first approach is the simplest and > > therefor the best. > > > > So how does this look: > > Better wrt keeping mapped_device out of dm-table.c. But it still has > the problem that it treats congestion in any subdevices equally (which > may be a good approximation to start with). The only other solution I see is to 1) add a mechanism for non-blocking generic_make_request() calls (returning EAGAIN) and 2) a way to check for congestion of a block device with (offset, len) parameters. It's hard though. You'd need request reservations on a queue that you can cancel later on if you discover that the whole multi-device request cannot be made. Something like a transaction with multiple requests. But that's currently a bit over my head at least and not 2.6 material either I think. Mike. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
