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Date:      Wed, 2 Jul 2025 14:02:14 -0700
From:      Rick Macklem <rick.macklem@gmail.com>
To:        FreeBSD CURRENT <freebsd-current@freebsd.org>
Subject:   RFC: checking file systems support UF_HIDDEN, UF_SYSTEM
Message-ID:  <CAM5tNy5eoY5f-fo9BKc4v34XKXF6%2B6Ae7Zpq=FH7owaSRYSHmw@mail.gmail.com>
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Hi,

I am implementing the "hidden" and "system" attributes for
NFSv4 using UF_HIDDEN and UF_SYSTEM.

In a couple of places in the code, I need to know if a file
system supports these flags.
I can think of two ways to do this.
#1 - Create a new VFCF_HIDSYS flag that is set via VFS_SET()
       for file systems that support the UF_HIDDEN and UF_SYSTEM
       flags and test for that flag being set.
or
#2 - Write it this way...
      if (strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") != 0 ||
          strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") != 0 ||
          strcmp(vp->v_mount->mnt_vfc->vfc_name, "msdosfs") != 0 ||
          strcmp(vp->v_mount->mnt_vfc->vfc_name, "tmpfs") != 0)

Which do you think is preferable (or do you have another idea)?

Thanks for any comments, rick
help

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