1. In a computing environment, a system comprising, at least one processor, a memory communicatively coupled to the at least one processor and including components comprising, a virtual disk comprising at least two overlapping layers, and a mechanism configured to handle I/O of a meta-operation that manipulates data of the virtual disk concurrent with servicing virtual disk read and write I/O of the virtual disk, including by allowing at least one meta-operation write to a virtual disk offset range concurrent with a virtual disk write to an overlapping virtual disk offset range when the virtual disk write cannot be damaged by the at least one meta-operation write, or when at least two writes are from a same source.