[OpenAFS-devel] AFS vs UNICODE

[Jeffrey Altman]

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Derrick Brashear wrote:
>>  Note that the problem is worse than might be inferred from your
>>  description.  If a fileserver is installed which behaves as you suggest,
>>  then when a MacOS X client creates a file with a name for which NFC and
>>  NFD produce different code sequences, the fileserver will normalize to NFC
>>  before creating the directory entry, and MacOS will be unable to look up
>>  the entry in the resulting directory.  It'll be subtle, too, because the
>>  MacOS client will update its local copy of the directory itself, with the
>>  NFD filename, and won't notice the fileserver's change until either that
>>  directory is changed by some other client or the directory data is evicted
>>  from the MacOS client's cache (note that callback expiration is _not_
>>  sufficient here -- the client can use "old" data in its cache as long as
>>  it does a new RXAFS_FetchStatus and notices the DV hasn't changed).
> 
> I'm thinking there's a trick to be done with an "unexpected" DV change
> such that LocalHero doesn't apply, avoiding this issue and forcing a
> refetch.

I still don't think that is going to do the right thing.
That will permit the old MacoS X client to create the file.  It will
read the directory with the new name in it.  And then be unable to open
it because NFD != NFC and the hash table lookup will fail.

I'm so sad.


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