On Fri, Feb 26, 2021 at 08:20:24AM +0800, Shiyang Ruan wrote:
> + if (!copy_edge) {
> + ret = copy_mc_to_kernel(daddr, saddr, length);
> + return ret;
No need for the ret variable here, this can be:
if (!copy_edge)
return
In the case where the iomap is a write operation and iomap is not equal
to srcmap after iomap_begin, we consider it is a CoW operation.
The destance extent which iomap indicated is new allocated extent.
So, it is needed to copy the data from srcmap to new allocated extent.
In theory, it is better
