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Re: [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read on
From: |
Fam Zheng |
Subject: |
Re: [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read only BdrvChild |
Date: |
Thu, 2 Mar 2017 00:10:23 +0800 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Wed, 03/01 16:16, Kevin Wolf wrote:
> > I'm not sure about this because: 1) this is intrusive from a user PoV, many
> > scripts and upper layer tools will stop working;
>
> Are you sure? I don't expect user scripts or even proper management
> tools to use qemu-io on running VMs. I do expect that some users are
> using 'convert -s' with running VMs despite our recommendation against
> it.
>
> If they are aware that they're doing something that works only in the
> right circumstances, then breaking it isn't nice. But my gut feeling is
> that most of them don't know about the implications of accessing a live
> image. In this case breaking their use case and making them think about
> whether they want to add something like a --force option sounds like a
> good thing because they aren't caught by surprise when things go wrong
> eventually.
Yes, the use case is poor for qcow2, and your points stand there. But image
locking will be at the posix level, which has a wider range of users. I cannot
draw the same conclusion on raw images as easily.
- [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read only BdrvChild, Fam Zheng, 2017/03/01
- Re: [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read only BdrvChild, Kevin Wolf, 2017/03/01
- Re: [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read only BdrvChild, Fam Zheng, 2017/03/01
- Re: [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read only BdrvChild, Kevin Wolf, 2017/03/01
- Re: [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read only BdrvChild,
Fam Zheng <=
- Re: [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read only BdrvChild, Kevin Wolf, 2017/03/01
- Re: [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read only BdrvChild, Fam Zheng, 2017/03/02
- Re: [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read only BdrvChild, Kevin Wolf, 2017/03/02
- Re: [Qemu-devel] [PATCH RFC] block: Tolerate existing writers on read only BdrvChild, Fam Zheng, 2017/03/02