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From: Eric Blake <eblake@redhat.com>
To: Jeff Cody <jcody@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>
Cc: kwolf@redhat.com, benoit.canet@irqsave.net, pkrempa@redhat.com,
	famz@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com
Subject: Re: [Qemu-devel] [PATCH v6 for 2.1 00/10] Modify block jobs to use node-names
Date: Thu, 19 Jun 2014 10:54:14 -0600	[thread overview]
Message-ID: <53A315B6.4020607@redhat.com> (raw)
In-Reply-To: <53A314B0.9030508@redhat.com>

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On 06/19/2014 10:49 AM, Eric Blake wrote:
> if qemu allows shared BDS, and I am able to open 'base' as a shared BDS
> for both disks, then an attempt to block-commit img1 into base will be
> blocked because base is still in use by img2.  But as a management app,
> I shouldn't be attempting that in the first place.  Yes, it would be
> nice if qemu blocks me from being stupid; but even if qemu allows shared
> BDS, if I don't open a shared BDS on 'base' in the first place, it is no
> different than if qemu doesn't allow shared BDS.  Either way, it's not
> qemu's fault if I, as management, try to commit into a file that is in
> use by more than one chain.
> 

That's what I meant to say,

> 
> if I am not able to do a shared BDS, I'm still
> and as the management, I did not request that qemu open 'base' as a
> shared BDS between both

and this was leftover ramblings that I was experimenting with, but
forgot to delete once I had the paragraph above the way I liked it.
Sorry for any confusion.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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  reply	other threads:[~2014-06-19 16:54 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-17 21:53 [Qemu-devel] [PATCH v6 for 2.1 00/10] Modify block jobs to use node-names Jeff Cody
2014-06-17 21:53 ` [Qemu-devel] [PATCH v6 for 2.1 01/10] block: Auto-generate node_names for each BDS entry Jeff Cody
2014-06-18 12:53   ` Benoît Canet
2014-06-18 13:13     ` Jeff Cody
2014-06-18 13:31       ` Benoît Canet
2014-06-19  8:55   ` Stefan Hajnoczi
2014-06-19 12:30     ` Jeff Cody
2014-06-19 17:03       ` Eric Blake
2014-06-20  4:24       ` Stefan Hajnoczi
2014-06-23 12:41       ` Stefan Hajnoczi
2014-06-17 21:53 ` [Qemu-devel] [PATCH v6 for 2.1 02/10] block: add helper function to determine if a BDS is in a chain Jeff Cody
2014-06-19  6:27   ` Stefan Hajnoczi
2014-06-23 10:24   ` Benoît Canet
2014-06-17 21:53 ` [Qemu-devel] [PATCH v6 for 2.1 03/10] block: simplify bdrv_find_base() and bdrv_find_overlay() Jeff Cody
2014-06-19  6:31   ` Stefan Hajnoczi
2014-06-17 21:53 ` [Qemu-devel] [PATCH v6 for 2.1 04/10] block: make 'top' argument to block-commit optional Jeff Cody
2014-06-17 22:25   ` Eric Blake
2014-06-19 16:56     ` Eric Blake
2014-06-19  6:40   ` Stefan Hajnoczi
2014-06-17 21:53 ` [Qemu-devel] [PATCH v6 for 2.1 05/10] block: Accept node-name arguments for block-commit Jeff Cody
2014-06-18 12:58   ` Benoît Canet
2014-06-17 21:53 ` [Qemu-devel] [PATCH v6 for 2.1 06/10] block: extend block-commit to accept a string for the backing file Jeff Cody
2014-06-19  7:49   ` Stefan Hajnoczi
2014-06-17 21:53 ` [Qemu-devel] [PATCH v6 for 2.1 07/10] block: add ability for block-stream to use node-name Jeff Cody
2014-06-18 13:06   ` Benoît Canet
2014-06-19  8:01   ` Stefan Hajnoczi
2014-06-17 21:53 ` [Qemu-devel] [PATCH v6 for 2.1 08/10] block: add backing-file option to block-stream Jeff Cody
2014-06-19  8:04   ` Stefan Hajnoczi
2014-06-17 21:53 ` [Qemu-devel] [PATCH v6 for 2.1 09/10] block: Add QMP documentation for block-stream Jeff Cody
2014-06-19  8:06   ` Stefan Hajnoczi
2014-06-17 21:53 ` [Qemu-devel] [PATCH v6 for 2.1 10/10] block: add QAPI command to allow live backing file change Jeff Cody
2014-06-18 13:15   ` Benoît Canet
2014-06-19  8:37     ` Stefan Hajnoczi
2014-06-19 19:08       ` Jeff Cody
2014-06-19  8:37   ` Stefan Hajnoczi
2014-06-19  9:17 ` [Qemu-devel] [PATCH v6 for 2.1 00/10] Modify block jobs to use node-names Stefan Hajnoczi
2014-06-19 16:26   ` Jeff Cody
2014-06-19 16:49     ` Eric Blake
2014-06-19 16:54       ` Eric Blake [this message]
2014-06-19 18:22       ` [Qemu-devel] Op Blockers on child nodes (was Re: [PATCH v6 for 2.1 00/10] Modify block jobs to use) node-names Jeff Cody
2014-06-24 12:55       ` [Qemu-devel] [PATCH v6 for 2.1 00/10] Modify block jobs to use node-names Kevin Wolf
2014-06-23 13:08     ` Stefan Hajnoczi
2014-06-23 14:17       ` Benoît Canet
2014-06-24  2:48       ` Fam Zheng
2014-06-24 13:32         ` Jeff Cody
2014-06-24 14:08           ` Kevin Wolf
2014-06-24 15:30             ` Benoît Canet
2014-06-19 17:49   ` Benoît Canet
2014-06-24 17:08   ` Jeff Cody

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