On Thu, 2017-05-11 at 11:39 +0200, Martin Wilck wrote: > On Tue, 2017-05-09 at 12:10 -0700, Andy Grover wrote: > > From: Mikulas Patocka <mpatocka@xxxxxxxxxx> > > > > This is the very simple patch for polling on the > > /dev/mapper/control > > device. The select or poll function waits until any event happens > > on > > any > > dm device since opening the /dev/mapper/control device. When select > > or > > poll returns the device as readable, we must close and reopen the > > device > > to wait for new dm events. > > Why have you done it that way? Couldn't you just save the > dm_global_event_nr at the time poll() is called? I should have read your patch 2/3 before posting ... but I'm still missing why the counter can't simply be set at poll() time. Regards Martin -- Dr. Martin Wilck <mwilck@xxxxxxxx>, Tel. +49 (0)911 74053 2107 SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
