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From: "m.j.harvey at imperial dot ac.uk" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug tapsets/26666] New: nfsd tapset - fh_export and fh_dentry
 always NULL for NFSv3
Date: Fri, 25 Sep 2020 18:03:50 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26666

            Bug ID: 26666
           Summary: nfsd tapset - fh_export and fh_dentry always NULL for
                    NFSv3
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: m.j.harvey at imperial dot ac.uk
  Target Milestone: ---

Hi,

When using the nfsd.proc.entries probes, fh->fh_dentry and fh->fh_export are
always NULL when the NFS version is 3. This makes it impossible to resolve =
the
full path of a file. When the NFS version is 4, this members are set as
expected and task_dentry_path(), inode_path() work as expected.

To reproduce:

Set up an NFS export, mount it as nfsv3
On the server run stap --all-modules
share/systemtap/examples/network/nfsd-trace.stp=20
On the client touch a new file on the mount
Onthe server note stap abort with
ERROR: read fault [man error::fault] at 0x38 near operator '->' at
nfsd-trace.stp:18:31

Remount with nfsv4, and repeat. Observe that the tap reports accesses
correctly.

adding printf("%s %s", fh->fh_dentry, fh->fh_export) and repeating confirms=
 the
difference.

Tested on RHEL 7.8 x86-64, kernel 3.10.0-1127.19.1, with RHEL systemtap 4.0=
 and
also current  git head (747902ed).

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