Re: [Libguestfs] [PATCH v3 0/4] file: Zero for block devices and older file systems

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/10d4dcfb30cb0ba626a2ec503c7c96f7...

https://github.com/libguestfs/nbdkit/commit/96a41cd798ec0dce07d97c2a4a04ee62...

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