[Qemu-devel] Re: [PATCH][block] qcow2: Support exact L1 table growth

[Kevin Wolf <kwolf@redhat.com>]

Am 18.10.2010 17:53, schrieb Stefan Hajnoczi:
> The L1 table grow operation includes a size calculation that bumps up
> the new L1 table size in order to anticipate the size needs of vmstate
> data.  This helps reduce the number of times that the L1 table has to be
> grown when vmstate data is appended.
> 
> This size overhead is not necessary during image creation,
> bdrv_truncate(), or snapshot goto operations.  In fact, existing
> qemu-iotests that exercise table growth are no longer able to trigger it
> because image creation preallocates an L1 table that is too large after
> changes to qcow_create2().
> 
> This patch keeps the size calculation but also adds exact growth for
> callers that do not want to inflate the L1 table size unnecessarily.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

Thanks, applied to the block branch.

Kevin