On Tue, Aug 21, 2018 at 4:07 PM Richard W.M. Jones <rjones@redhat.com> wrote:

FYI I added a few enhancements to allow easier tracing inside the file
plugin:

https://github.com/libguestfs/nbdkit/commit/10d4dcfb30cb0ba626a2ec503c7c96f72c6ca88e
https://github.com/libguestfs/nbdkit/commit/96a41cd798ec0dce07d97c2a4a04ee6284e1552f

Cool

I learned from this that the file_zero function does successfully use
fallocate to zero ranges, at least on my very recent Linux system.

I used strace with one thread to test these features, nice be able to peek

into the plugin state like this.

Nir