[sheepdog] [Sheepdog] [PATCH v2] sheep: update inode cache first

[Christoph Hellwig]

On Wed, May 16, 2012 at 12:05:51PM +0900, MORITA Kazutaka wrote:
> > flushing the cache, we already have mechanism to to do this, qemu-io -c
> > "flush".
> 
> IMHO, the uppler layer should assume that the underlying one provides
> a block storage semantic to simplify the implementation.  And
> actually, there is no other block driver in QEMU and OpenStack which
> needs a flush request to read the latest data from another node.

Actually there is in QEMU - it's file backed images on NFS for certain
coner cases, and they are a massive PITA to handle, last time I checked
with Redhat-private patches not even in upstream qemu for live
migration.