Samba caseinsensitive lookup benchmark

[Jeremy Allison]

On Thu, Apr 10, 2008 at 07:00:05PM -0700, James Peach wrote:
> Hi Barry,
>
> I stumbled over the XFS CI patch thread. One of the reasons this might not 
> have shown any benchmark improvement is that Samba needs some minor fixes 
> to support case-insensitive filesystems better:
>
> <http://git.samba.org/?p=jpeach/samba.git;a=commitdiff;h=519dc6cf4acff10f2c10ca78114a8e0e8e0e46b1>
>
> I also have a smbtorture benchmark that I used to demonstrate the 
> performance benefit. There's not much advantage in most cases for 
> well-behaved client. The benchmark I wrote demonstrates that CI in the 
> filesystem should save us from really horrible performance in the lookup 
> failure case (and does on HFS+).
>
> I'll push it through open source review - should be upstream in about a 
> week.

I'd like to discuss this one before you do that. You've added a
fs_capabilities to the connection struct which looks ok, but
then you split out the checks for (conn->fs_capabilities &
FILE_CASE_SENSITIVE_SEARCH) separately from the same checks on
if (conn->case_sensitive) - at least in some places in your
patch (eg. your smbd/filename.c change). These should be
identical - in fact we should probably replace all these
checks with an :

FS_IS_CASE_INSENSITIVE(conn) (((conn)->fs_capabilities &
FILE_CASE_SENSITIVE_SEARCH) || (!(conn)->case_sensitive))

macro instead, and just use that as the one check.

Jeremy.