[Bug 283420] mount -p doesn't display correctly unionfs mounts

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 19 Dec 2024 17:26:19 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283420

            Bug ID: 283420
           Summary: mount -p doesn't display correctly unionfs mounts
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: olivier@freebsd.org

mount -p (displaying in fstab format) is buggy with unionfs mounts.

How to reproduce:

$ mkdir -p /tmp/jails/usr/local
$ mount -t unionfs -o below -o noatime /usr/local /tmp/jails/testing/usr/local
$ mount | grep unionfs
<below>:/usr/local on /tmp/jails/usr/local (unionfs, NFS exported, local,
noatime, nfsv4acls)
$ $ mount -p | grep unionfs
/u                      /tmp/jails/usr/local unionfs    rw,noatime,nfsv4acls   
0 0

=> It is displaying "/u" in place of "/usr/local".

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