[libvirt] RFC: API additions for enhanced snapshot support

Jes Sorensen Jes.Sorensen at redhat.com
Fri Jul 8 13:35:13 UTC 2011

On 07/08/11 10:58, Stefan Hajnoczi wrote:
> On Thu, Jul 7, 2011 at 8:34 PM, Eric Blake <eblake at redhat.com> wrote:
>> Well, the best thing (from libvirt's point of view) would be if
>> snapshot_blkdev took a single string argument, which is either a
>> /path/to/filename (and qemu does open()) or fd:name notation (to refer
>> to a previously-named fd passed via the getfd monitor command, so that
>> libvirt does open()).  This would make SELinux integration easier, as
>> one of the sVirt goals is to get to the point where we can use SELinux
>> to forbid qemu from open()ing files on NFS shares, while still
>> permitting all other operations on already-open fds passed in from libvirt.
> Today QEMU supports /path/to/filename.  An fd argument to
> snapshot_blkdev requires a little bit of work since the QEMU block
> layer .bdrv_create() interface takes a filename and tries to create
> it.
> Jes: Is the fd argument to snapshot_blkdev in your plans?

I only ever heard suggestions for taking fd arguments yesterday, so I
cannot say it really is in my plans. If I get a good justification I
might be convinced :)


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