[dm-devel] [PATCH 1/3] dm: a basic support for using the select or poll function

[Martin Wilck]

On Tue, 2017-05-09 at 12:10 -0700, Andy Grover wrote:
> From: Mikulas Patocka <mpatocka at redhat.com>
> 
> 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?

Regards
Martin

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