From: Stefan Bader <Stefan.Bader@de.ibm.com>
To: agk@redhat.com
Cc: dm-devel@redhat.com
Subject: Re: [PATCH and question]: dm-table should check for valid queue]
Date: Tue, 15 Aug 2006 12:02:04 +0200 [thread overview]
Message-ID: <44E19B9C.1010604@de.ibm.com> (raw)
> On Thu, Aug 10, 2006 at 01:29:08PM +0200, Stefan Bader wrote:
>> But what effect should a missing queue have? Same
>> as device is congested or not or let the call fail somehow?
>
> I'm curious - under what circumstances is this missing:
> Is it intentional, or is it perhaps a race that needs fixing?
>
More or less intentional. If a device is (virtually) ripped from the
system the driver will throw everything away. Device-mapper still has a
reference to the bdev but the queue is cleaned and removed.
I am not sure whether the any congested call would ever be triggered in
that situation. But at least the unplug all is when user-space tries to
change the maps to remove or replace the missing device. And very likely
the flush all call would be used as well (probably after that).
Stefan
reply other threads:[~2006-08-15 10:02 UTC|newest]
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