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From: Mike Snitzer <snitzer@redhat.com>
To: Alasdair G Kergon <agk@redhat.com>
Cc: dm-devel@redhat.com, Mikulas Patocka <mpatocka@redhat.com>
Subject: Re: [PATCH 1 of 2] DM Exception Store: return zero when empty
Date: Tue, 29 Sep 2009 11:38:12 -0400	[thread overview]
Message-ID: <20090929153812.GA30538@redhat.com> (raw)
In-Reply-To: <20090924125148.GJ3866@agk-dp.fab.redhat.com>

On Thu, Sep 24 2009 at  8:51am -0400,
Alasdair G Kergon <agk@redhat.com> wrote:

> On Wed, Sep 23, 2009 at 10:24:58AM -0500, Jon Brassow wrote:
> > When the snapshot is empty, return 0 as the number of allocated sectors.
> > This will be needed to properly notify userspace that merging is finished.
> 
> A kernel/userspace interface change and visible to the user in their tools.
> Needs discussion.

I'd be quite surprised if any users' scripts had the intelligence that
the persistent exception store always used the first 2 chunks.

I view this patch as a fix and would like to see it pushed for
2.6.32-rcX

This patch is also a prerequisite for some patches I just posted to
lvm-devel:
http://www.redhat.com/archives/lvm-devel/2009-September/msg00145.html

      reply	other threads:[~2009-09-29 15:38 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-23 15:24 [PATCH 1 of 2] DM Exception Store: return zero when empty Jonathan Brassow
2009-09-24 12:51 ` Alasdair G Kergon
2009-09-29 15:38   ` Mike Snitzer [this message]

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