Date: Mon, 20 Oct 2025 16:20:21 -0700 From: Rick Macklem <rick.macklem@gmail.com> To: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: RFC: _PC_HAS_HIDDENSYSTEM rename Message-ID: <CAM5tNy7y7RUXjJV1degDTrnG6dOwkkd%2Ba_jOU2ojaFzpFh6Fzg@mail.gmail.com>
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Hi There are three flags UF_HIDDEN, UF_SYSTEM and UF_ARCHIVE defined in sys/stat.h (their origin is in MS-DOS). If a file system implements any of these flags, they implement all three of them, afaik. Commit afd5bc6309 (in main) defined _PC_HAS_HIDDENSYSTEM to allow pathconf to indicate if a file system supports the first two of these. I had ignored the third, since it is listed as "deprecated" in RFC-8881. It now turns out that the Windows NFSv4.1 client folk want support for UF_ARCHIVE and consider that it should not be deprecated. I do not think adding a separate _PC_HAS_ARCHIVE pathconf name is useful, since it is supported when _PC_HAS_HIDDENSYSTEM is returned non-zero. However, the name _PC_HAS_HIDDENSYSTEM is misleading, so what do others think I should do? - Add an alias for _PC_HAS_HIDDENSYSTEM called something like _PC_HAS_HIDSYSARCH or _PC_HAS_HIDDENSYSTEMARCHIVE? (Since _PC_HAS_HIDDENSYSTEM is now in the OpenZFS code, it needs to remain in unistd.h, at least for now.) Or - Just leave the name as is and document it correctly in pathconf(2)? Thanks for any comments, rickhome | help
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