newer kernel+systemtap & nfs.fop.open

[Daire Byrne]

Hi,

Is anyone able to point me in the right direction or is there a better
forum for asking these kinds of questions?

Cheers,

Daire

On Thu, 10 Mar 2022 at 19:58, Daire Byrne <daire@dneg.com> wrote:

> Hi,
>
> Bit of a newbie question, but I'm trying to port some older code to a
> newer version of systemtap (4.7pre) and I'm seeing a change in
> behaviour in the output of this:
>
> stap -e 'probe nfs.fop.open { filename = sprintf("%s",
> d_path(&$filp->f_path)); printf("filename: %s\n", filename)}'
>
> On previous versions (RHEL7, stap v4.1), the resulting filename had
> the full path including the mounted directory path or autompunt path,
> But on newer version of the kernel and systemtap, it seems like only
> the file path after the NFS mountpoint is being printed.
>
> Is there some other trick now required with the
> d_path((&$filp->f_path)) to include the NFS mountpoint location and
> provide the full path?
>
> Many thanks,
>
> Daire
>