linux-kernel - Re: [RFC 1/4] Large Blocksize support for Ext2/3/4

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Message-ID: <Pine.LNX.4.64.0708291758520.4670@schroedinger.engr.sgi.com>
Date:	Wed, 29 Aug 2007 17:59:58 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mingming Cao <cmm@...ibm.com>
cc:	linux-fsdevel@...r.kernel.org, adilger@...sterfs.com,
	sho@...s.nec.co.jp, ext4 development <linux-ext4@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/4] Large Blocksize support for Ext2/3/4

On Wed, 29 Aug 2007, Mingming Cao wrote:

> It's quite simple to support large block size in ext2/3/4, mostly just
> enlarge the block size limit.  But it is NOT possible to have 64kB
> blocksize on ext2/3/4 without some changes to the directory handling
> code.  The reason is that an empty 64kB directory block would have a
> rec_len == (__u16)2^16 == 0, and this would cause an error to be hit in
> the filesystem.  The proposed solution is to put 2 empty records in such
> a directory, or to special-case an impossible value like rec_len =
> 0xffff to handle this. 

Ahh. Good.

I could add the path to the large blocksize patchset?

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