linux-ext4 - Re: infinite getdents64 loop

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Message-Id: <048ABCD7-FB3B-44CF-A0A5-4B230B1775DE@dilger.ca>
Date:	Tue, 31 May 2011 13:16:34 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
Cc:	"Ted Ts'o" <tytso@....edu>, linux-nfs@...r.kernel.org,
	"linux-ext4@...r.kernel.org List" <linux-ext4@...r.kernel.org>,
	Fan Yong <yong.fan@...mcloud.com>
Subject: Re: infinite getdents64 loop

On 2011-05-31, at 11:43 AM, Bernd Schubert wrote:
> On 05/31/2011 07:26 PM, Andreas Dilger wrote:
>> If it's of interest, we've implemented a 64-bit hash mode for ext4 to
>> solve just this problem for Lustre.  The llseek() code will return a
>> 64-bit hash value on 64-bit systems, unless it is running for some
>> process that needs a 32-bit hash value (only NFSv2, AFAIK).
>> 
>> The attached patch can at least form the basis for being able to return
>> 64-bit hash values for userspace/NFSv3/v4 when usable.  The patch
>> is NOT usable as it stands now, since I've had to modify it from the
>> version that we are currently using for Lustre (this version hasn't
>> actually been compiled), but it at least shows the outline of what needs
>> to be done to get this working.  None of the NFS side is implemented.
> 
> Thanks Andreas! I haven't tested it yet, but the generic idea looks good. I guess the lower part of the patch (netfilter stuff) got accidentally in?

Oops, I had refreshed the patch just before sending, and forgot to remove those parts.  They are definitely not relevant to this issue.

Cheers, Andreas





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