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Date:	Wed, 22 Jan 2025 00:37:57 +0100
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Subject:	Handing filesystems which do not support some timestamp fields in
	|FILE_BASIC_INFO| and Microsoft NFSv3 driver "NfsV3Attributes" EA ...
To:	cygwin AT cygwin DOT com
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From:	Roland Mainz via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Roland Mainz <roland DOT mainz AT nrubsig DOT org>
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Hi!

----

If a Windows filesystem does not support a type of timestamp it sets
the matching timestamp field in |FILE_BASIC_INFO| to |0LL| (e.g. see
Windows-driver-samples/filesys/cdfs/fileinfo.c:
|Buffer->LastAccessTime.QuadPart = 0| ; typically this can affect
|FILE_BASIC_INFO.CreationTime| and/or
|FILE_BASIC_INFO.LastAccessTime|, but formally any combination of
timestamp fields can be unsupported(==|0LL|)), and the Microsoft NFSv3
driver sets the matching
|nfs_timestruc_t.tv_sec|+|nfs_timestruc_t.tv_nsec| to a negative value
(traditional UNIX uses -1, see
https://github.com/gagern/gnulib/blob/master/lib/stat-time.h#L173 -
and this value is then propagated via NFS), but I can't find a place
in Cygwin where this is explicitly handled - is this missing, or is
this code handling this somehow implicitly ?

----

Bye,
Roland
-- 
  __ .  . __
 (o.\ \/ /.o) roland DOT mainz AT nrubsig DOT org
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  /O /==\ O\  TEL +49 641 3992797
 (;O/ \/ \O;)

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