|FILE_ID_BOTH_DIR_INFORMATION| fields |ShortName|+|ShortNameLength| mandatory for Cygwin and Window 10 ?

[Roland Mainz]

On Sat, Apr 27, 2024 at 5:03 PM Brian Inglis via Cygwin
<cygwin@cygwin.com> wrote:
>
> On 2024-04-27 07:08, Roland Mainz via Cygwin wrote:
> > Are the |FILE_ID_BOTH_DIR_INFORMATION| fields
> > |ShortName|+|ShortNameLength| mandatory these days, e.g. is it legal
> > to set |ShortNameLength = 0;| for Cygwin 3.4/3.5 in Windows 10 ?
>
> MS Windows 8/Server 2012+ disabled 8.3 short name generation on new
> volumes/partitions, for example see:
>
>         https://ss64.com/nt/syntax-filenames.html
>
>         https://archive.techarp.com/showarticle53b4.html?artno=827
>
> https://learn.microsoft.com/en-ca/archive/blogs/josebda/windows-server-2012-file-server-tip-disable-8-3-naming-and-strip-those-short-names-too
>
> https://learn.microsoft.com/en-ca/windows-server/administration/windows-commands/fsutil-8dot3name

Thanks...:-)
... for now I've disabled 8.3 short name generation in the
ms-nfs41-client driver (see
https://github.com/kofemann/ms-nfs41-client/commit/f5f276db6337f34d7705e9c981213e31adbb0c7d),
until I have time to implement working 8.3. short name algorithm...

[snip]
> > Is there anything else for a filesystem driver to do to indicate that
> > |ShortName| support is not available ?
>
> Also see fsutil behavior query|set disable8dot3 [[<volumepath> [{1|0}]]|<value>]
[snip]
> Sample commands:
>    "fsutil 8dot3name set 1"      - disable 8dot3 name creation on all volumes
>    "fsutil 8dot3name set C: 1"   - disable 8dot3 name creation on c:

Is there any filesystem driver/kernel API for this ?

[snip]
> Based on the above settings, 8dot3 name creation is enabled on c:
>
> % fsutil 8dot3name query d:
> The volume state is: 0 (8dot3 name creation is enabled).
> The registry state is: 2 (Per volume setting - the default).

Same question: Is there a driver/kernel API ?

----

Bye,
Roland
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