linux-ext4 - Re: ask for help; hash-directory machanism of ext3 cannot work well

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Date:	Fri, 22 Jun 2007 02:20:00 -0400
From:	Theodore Tso <tytso@....edu>
To:	LIOU Payphone <lioupayphone@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: ask for help; hash-directory machanism of ext3 cannot work well

On Fri, Jun 22, 2007 at 09:52:55AM +0800, LIOU Payphone wrote:
> 
> What makes me puzzled is there are two entries both  named  "3220" with ino
> "3350" were shown under "/mnt" when I "ls  -li  /mnt".

Hmm.  I still can't verify this.

Can you replicate the result?  If so, can you send me the output of
dumpe2fs?

> The version of kernel is 2.6.17-1.2142; and e2fsprogs-1.28. 

That looks like a vendor version of the kernel; what distribution are
you using?

E2fsprogs 1.28 is a frighteningly old version of e2fsprogs.  Did you
really mean 1.28?  Or 1.38?

> You know that we can set "s_def_hash_version" to be "DX_HASH_LEAGCY" in
> function  "main{}" of mke2fs.c 

Oh, so you were modifying your sources to set this variable?

> But I don't know why the latest version e2fsprogs-1.39 takes "DX_HASH_TEA"
> for default. Why "DX_HASH_LEAGCY" cannot be taken for default? Could you
> tell me the reason for it? Thanks.  :-)

Because DX_HASH_TEA is a better hash, and because it is keyed off of a
per-filesystem secret hash value stored in the superblock.

						- Ted
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