From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: FUSE, symbolic links and special files
Date: Fri, 26 Aug 2016 10:25:00 -0000 [thread overview]
Message-ID: <20160826080551.GA23935@calimero.vinschen.de> (raw)
In-Reply-To: <D3E512D6.AF5F%billziss@navimatics.com>
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On Aug 25 19:04, Bill Zissimopoulos wrote:
> On 8/25/16, 3:45 PM, Corinna Vinschen wrote:
> >...it needs thorough testing(*). There's a good chance that the NFS RP
> >buffer is not exposed to user space, but instead only handled by the NFS
> >driver. *If* the RP method works fine in user space, I'm inclined to do
> >as outlined above and get rid of the EA stuff in symlink_info::check
> >since it could be transparently shared between NFS and WinFSP.
>
> I agree. FYI I have not tested the use of NFS reparse points yet, although
> I intend to.
>
> My expectation is that there should not be any issue accessing such
> reparse points from user mode. My understanding of the reparse point
> mechanism is that it comes into play in a couple of cases:
No, me neither, but the MSDN documentation is, shall we say, limited...
> - The first case is during the processing of NtCreateFile (without the
> FILE_OPEN_REPARSE_POINT flag set).
This case doesn't matter to us. Cygwin always opens the file with
FILE_OPEN_REPARSE_POINT set...
> - The second case is through direct manipulation of the reparse point
> using FSCTL_GET_REPARSE_POINT, FSCTL_SET_REPARSE_POINT and
> FSCTL_DELETE_REPARSE_POINT.
>
> Let us consider the expected behavior of an NFS_SPECFILE_LNK reparse point
> (this is speculation) during NtCreateFile:
>
> - On NTFS prior to Win8:
> - STATUS_IO_REPARSE_TAG_NOT_HANDLED
...so this shouldn't happen to us, right?
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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next prev parent reply other threads:[~2016-08-26 8:05 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-25 12:49 Bill Zissimopoulos
2016-08-25 13:04 ` Corinna Vinschen
2016-08-25 13:38 ` Jeffrey Altman
2016-08-25 13:54 ` Corinna Vinschen
2016-08-25 14:52 ` Jeffrey Altman
2016-08-25 15:59 ` Corinna Vinschen
2016-08-25 19:04 ` Jeffrey Altman
2016-08-25 19:41 ` Bill Zissimopoulos
2016-08-25 21:15 ` Bill Zissimopoulos
2016-08-25 19:15 ` Bill Zissimopoulos
2016-08-26 10:25 ` Corinna Vinschen [this message]
2016-08-26 14:35 ` Bill Zissimopoulos
2016-09-20 22:02 ` Bill Zissimopoulos
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