From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alasdair G Kergon <agk@redhat.com>
Subject: Re: dm-cache suspend semantics
Date: Wed, 19 Aug 2015 19:42:05 +0100
Message-ID: <20150819184204.GC18567@agk-dp.fab.redhat.com>
References: <CAM2wQBsvnY+eBMxEFRy07f=16XnYmcdVQOewo-DWBseSnqAR9g@mail.gmail.com>
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To: Thanos Makatos <thanos.makatos@onapp.com>
Cc: heinzm@redhat.com, device-mapper development <dm-devel@redhat.com>, thornber@redhat.com, Mike Snitzer <snitzer@redhat.com>
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On Wed, Aug 19, 2015 at 12:26:20PM +0100, Thanos Makatos wrote:
> I'd like to know whether it is possible for a cache target for which
> there are dirty blocks to continue writing back dirty data after it
> has been suspended. Can this happen?

A suspended device-mapper device must not generate any I/O to the
devices underneath it while it is suspended.

Alasdair