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Date:      Sun, 28 May 2023 10:57:09 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 271692] zfs inherit always behaves as if the -S flag was given
Message-ID:  <bug-271692-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D271692

            Bug ID: 271692
           Summary: zfs inherit always behaves as if the -S flag was given
           Product: Base System
           Version: 12.4-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: d8zNeCFG@aon.at

Scenario:
- FreeBSD 12.4 latest patches
- The following commands have been issued:

[0]# zfs get canmount coconut.3/12/usr/local.OLD
NAME                        PROPERTY  VALUE     SOURCE
coconut.3/12/usr/local.OLD  canmount  off       local
[0]# zfs get mountpoint coconut.3/12/usr/local.OLD
NAME                        PROPERTY    VALUE           SOURCE
coconut.3/12/usr/local.OLD  mountpoint  /usr/local.OLD  local
[0]# zfs inherit mountpoint coconut.3/12/usr/local.OLD
[0]# zfs get mountpoint coconut.3/12/usr/local.OLD=20=20=20=20
NAME                        PROPERTY    VALUE       SOURCE
coconut.3/12/usr/local.OLD  mountpoint  /usr/local  received
[0]# zfs inherit mountpoint coconut.3/12/usr/local.OLD
[0]# zfs get mountpoint coconut.3/12/usr/local.OLD=20=20=20=20
NAME                        PROPERTY    VALUE       SOURCE
coconut.3/12/usr/local.OLD  mountpoint  /usr/local  received
[0]# zfs set mountpoint=3D/usr/local.OLD coconut.3/12/usr/local.OLD
[0]# zfs get mountpoint coconut.3/12/usr/local.OLD=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20
NAME                        PROPERTY    VALUE           SOURCE
coconut.3/12/usr/local.OLD  mountpoint  /usr/local.OLD  local
[0]# zfs inherit mountpoint coconut.3/12/usr/local.OLD=20=20=20=20=20=20=20=
=20=20=20=20
[0]# zfs get mountpoint coconut.3/12/usr/local.OLD=20=20=20=20
NAME                        PROPERTY    VALUE       SOURCE
coconut.3/12/usr/local.OLD  mountpoint  /usr/local  received
[0]# zfs inherit -S mountpoint coconut.3/12/usr/local.OLD
[0]# zfs get mountpoint coconut.3/12/usr/local.OLD=20=20=20=20=20=20=20
NAME                        PROPERTY    VALUE       SOURCE
coconut.3/12/usr/local.OLD  mountpoint  /usr/local  received
[0]# zfs set mountpoint=3D/usr/local.OLD coconut.3/12/usr/local.OLD
[0]# zfs get mountpoint coconut.3/12/usr/local.OLD=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20
NAME                        PROPERTY    VALUE           SOURCE
coconut.3/12/usr/local.OLD  mountpoint  /usr/local.OLD  local
[0]# zfs get mountpoint coconut.3/12/usr=20=20=20=20=20=20=20=20=20=20
NAME              PROPERTY    VALUE       SOURCE
coconut.3/12/usr  mountpoint  /usr        inherited from coconut.3/12
[0]#=20

Result (see the scenario above):
- The mountpoint of coconut.3/12/usr/local.OLD is never set to its inherited
default of /usr/local.OLD, even if no -S flag is given to the "zfs inherit"
command. In fact, "zfs inherit" behaves as if the -S flag is always specifi=
ed.

Expected result:
- After "zfs inherit mountpoint coconut.3/12/usr/local.OLD", the mountpoint
should be set to the parent's mountpoint plus the filesystem name, in this =
case
to /usr/local.OLD.

See also
https://forums.freebsd.org/threads/zfs-inherit-mountpoint-after-zfs-rename-=
not-working.59965/
where the second post describes exactly the same issue.

-- Martin

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