On Thu, Jan 27, 2011 at 11:45:55AM -0600, Anthony Liguori wrote: > On 01/27/2011 09:52 AM, Kevin Wolf wrote: > >This adds a preallocation=full mode to qcow2 image creation, which does not > >only allocate metadata for the whole image, but also writes zeros to it, > >creating a non-sparse image file. > > The writing zeros bit is in order to support physical devices? > Would it be better to have a flag in BlockDriverState that indicated > whether uninitialized sectors could be assumed to be zero filled and > key off of that?
There is already: int bdrv_has_zero_init(BlockDriverState *bs); Stefan
