[Bug 282981] zfs: fails when setting UF_NOUNLINK with EOPNOSUPP (SF_UNLINK works)

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 26 Nov 2024 02:45:29 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282981

            Bug ID: 282981
           Summary: zfs: fails when setting UF_NOUNLINK with EOPNOSUPP
                    (SF_UNLINK works)
           Product: Base System
           Version: 14.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: ngie@FreeBSD.org

chflags sunlink works, but chflags uunlink does not. This is because
zfs_freebsd_setattr(..) does not map UF_UNLINK to a valid fflags attribute.

Example:

```shell
% chflags uunlink foo 
chflags: foo: Operation not supported
% chflags sunlink foo
chflags: foo: Operation not permitted
% sudo chflags sunlink foo
% uname -a
FreeBSD gilot.local 14.1-RELEASE-p4 FreeBSD 14.1-RELEASE-p4 GENERIC amd64
```

Discovered when running a kyua unittest on /tmp backed by ZFS.

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