On Wed, 3 Aug 2011 18:31:31 +0200 Christoph Hellwig <h...@lst.de> wrote:
> > It's already possible for QMP clients to implement this feature by using > > the BLOCK_IO_ERROR event. However, the event can be missed. When this > > happens QMP clients need a way to query if any block device has hit a > > no space condition. > > We have a mode where we stop the VM when it hits ENOSPC, and that is > the only reliably way to handle it. This series just complements that mode by allowing a mngt application to query which device triggered the ENOSPC. Well, that's my intention :) > One that ENOSPC gets returned > to the guest we don't know that it was an ENOSPC, and the guest will > usually simply shut the filesystem down. This could be worked around > by implementing full T10 logical provisioning support, but very few > guests actually support it properly. And it won't work with ide disks > at all, and for virtio we'd have to implement it first. Seems interesting, but the current solution is guest independent.
