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| author | Max Reitz <mreitz@redhat.com> | 2017-05-04 01:11:18 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2017-05-11 12:08:24 +0200 |
| commit | 564a6b693828ac38f3f562eed9e8b1dc62f45253 (patch) | |
| tree | 466aa3bfb92a455ccb0648dea25659b3563e22df /scripts/qemu.py | |
| parent | 92413c16be8eee53a3b60739f2a28a1463651f47 (diff) | |
| download | focaccia-qemu-564a6b693828ac38f3f562eed9e8b1dc62f45253.tar.gz focaccia-qemu-564a6b693828ac38f3f562eed9e8b1dc62f45253.zip | |
qcow2: Reuse preallocated zero clusters
Instead of just freeing preallocated zero clusters and completely allocating them from scratch, reuse them. We cannot do this in handle_copied(), however, since this is a COW operation. Therefore, we have to add the new logic to handle_alloc() and simply return the existing offset if it exists. The only catch is that we have to convince qcow2_alloc_cluster_link_l2() not to free the old clusters (because we have reused them). Reported-by: Eric Blake <eblake@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'scripts/qemu.py')
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