blockdev: check for BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
The BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE op blocker exists but was never used! Let's fix that so snapshot delete can be blocked. Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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