[PATCH] Ensure query fs attributes correctly returns values.

[Jeremy Allison]

On Tue, Jun 19, 2018 at 03:15:26PM -0700, Jeremy Allison wrote:
> Hi Ralph & Metze,
> 
> At the plugfest Steve and I had an interesting disuccion.
> 
> SMB2 POSIX extensions can't *guearentee* case-sensitive
> filesystem access, as the underlying filesystem might
> itself have been mounted case-insensitive (this is
> possible currently for ZFS on Linux and FreeBSD,
> and XFS on Linux).
> 
> Instead, SMB2 POSIX should expose the *actual*
> case-sensitivity of the filesystem mount.
> 
> Specifying this instead of always case-sensitive
> also helps if the MS-Azure SMB implementation
> wants to add the SMB2 POSIX extensions in future.
> 
> Unfortunately there is no way to programatically
> find this out (there is a new statvfs call in
> Linux that gives this information, but it won't
> be in released kernels for a long, long time,
> plus FreeBSD doesn't have this info in their
> statvfs).
> 
> Currently, smbd SMB_QUERY_FS_ATTRIBUTE_INFO arbitrarily
> adds in FILE_CASE_PRESERVED_NAMES|FILE_CASE_SENSITIVE_SEARCH
> into the returned filesystem attributes, regrdless
> of how "case sensitive =" or "case preserve =" are
> set in the smb.conf.
> 
> This patch changes qfsinfo to return the currently
> used values of these flags, not hard coding them.

Version #2. Forgot about the per-packet case
possibilities of SMB1 (die SMB1, die ! :-).

Jeremy.
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