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Date:	Tue, 30 Aug 2011 23:59:23 +0200
From:	Bernd Schubert <>
To:	"J. Bruce Fields" <>
CC:	Bernd Schubert <>,,,,,,,
Subject: Re: [PATCH 0/2] 32/64 bit llseek hashes (v3)

On 08/23/2011 11:56 PM, J. Bruce Fields wrote:
> On Tue, Aug 16, 2011 at 01:54:04PM +0200, Bernd Schubert wrote:
>> With the ext3/ext4 directory index implementation hashes are used to specify
>> offsets for llseek(). For compatibility with NFSv2 and 32-bit user space
>> on 64-bit systems (kernel space) ext3/ext4 currently only return 32-bit
>> hashes and therefore the probability of hash collisions for larger directories
>> is rather high. As recently reported on the NFS mailing list that theoretical
>> problem also happens on real systems:
>> The following series adds two new f_mode flags to tell ext4
>> to use 32-bit or 64-bit hash values for llseek() calls.
>> These flags can then used by network file systems, such as NFS, to
>> request 32-bit or 64-bit offsets (hashes).
>> Version 3:
>> - remove patch "RFC: Remove check for a 32-bit cookie in nfsd4_readdir()",
>>    I think Bruce wanted to take it seperately as bug fix. It should be applied
>>    before applying the remaining NFS patches, as without it NFSv4 will always
>>    fail with the new 64-bit ext4 seek hashes.
> Yes, applied to my for-3.2 branch at
> git://
> For the NFS patches:
> 	Acked-by: J. Bruce Fields<>
> OK by me if they go in through ext4 tree, or however's most convenient.

Great, thanks!

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