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Re: [RFC] Unicode/UTF-8 support for XFS

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [RFC] Unicode/UTF-8 support for XFS
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 16 Sep 2014 14:02:35 -0700
Cc: Olaf Weber <olaf@xxxxxxx>, Ben Myers <bpm@xxxxxxx>, tinguely@xxxxxxx, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20140916205406.GJ4322@dastard>
References: <20140911203735.GA19952@xxxxxxx> <20140912100230.GB4267@dastard> <5412DF37.9030005@xxxxxxx> <20140912205528.GB11717@xxxxxxxxxxxxx> <54169248.1090105@xxxxxxx> <20140916205406.GJ4322@dastard>
User-agent: Mutt/1.5.23 (2014-03-12)
On Wed, Sep 17, 2014 at 06:54:06AM +1000, Dave Chinner wrote:
> So how do existing utf8/unicode enabled filesystems handle this? 
> 
> I think we should be consistent with ZFS, MacOS and others that
> already deal with this problem if at all possible. However, this
> really is a wider policy decision for the kernel/VFS as we want
> consistent behaviour across all linux filesystems, hence this
> patchset really needs to discussed at the lkml/-fsdevel level...

Absolutely.  I've also talked to a few Samba folks at SDC, and one
thing they would love to see is conditional case insensitive lookups,
e.g.:

 - we hash case insensitive with collisions, but perform normal case
   sensitive lookups.
 - with a new AT_CASE_INSENSTIVE flag to the various *at calls that
   gets passed down to the dcache we enable CI lookups.

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