[Bug 192050] New: [zfs] The allowed character set for ZFS dataset names is very limited

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192050

            Bug ID: 192050
           Summary: [zfs] The allowed character set for ZFS dataset names
                    is very limited
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: aberg010 at my.hennepintech.edu

While there are very few limitations on directory names, ZFS dataset names seem
to support only alphanumeric characters and the space character. This is
extremely annoying when trying to create the occasional dataset where the
intended directory name has a punctuation mark such as an exclamation point. It
also does not seem to support non-ASCII characters either. With the exception
of @, I cannot see why a ZFS dataset name cannot support any character that is
allowed in a directory name.
With this limitation, there are two workarounds: limit directory names to the
character set allowed in dataset names, or create different dataset names and
explicitly set the mountpoint to have the correct name of the directory. The
former is kind of absurd, but more or less manageable, depending on how badly
you want/need the directory name to be correct. The latter creates the need for
more complicated scripts and workflows, and extra permissions are needed for
creating and mounting datasets with explicitly set mountpoints.


# zfs create storage/文字化け
cannot create 'storage/文字化け': invalid character ' in name
# zfs create storage/touché
cannot create 'storage/touché': invalid character ' in name
# zfs create "storage/Here Today, Gone Tomorrow"
cannot create 'storage/Here Today, Gone Tomorrow': invalid character ',' in
name
# zfs create "storage/Why?"
cannot create 'storage/Why?': invalid character '?' in name


I am quite curious why such a limitation exists. I would also like to know if
this is a limitation of ZFS as a whole or just zfs(8) in particular.

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