linux-ext4 - Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block size

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Message-Id: <20071017210925.c3c66de5.akpm@linux-foundation.org>
Date:	Wed, 17 Oct 2007 21:09:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jan Kara <jack@...e.cz>
Cc:	cmm@...ibm.com, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, sho@...s.nec.co.jp, clameter@....com
Subject: Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block size

On Thu, 11 Oct 2007 13:18:49 +0200 Jan Kara <jack@...e.cz> wrote:

> With 64KB blocksize, a directory entry can have size 64KB which does not fit
> into 16 bits we have for entry lenght. So we store 0xffff instead and convert
> value when read from / written to disk.

btw, this changes ext2's on-disk format.

a) is the ext2 format documented anywhere?  If so, that document will
   need updating.

b) what happens when an old ext2 driver tries to read and/or write this
   directory entry?  Do we need a compat flag for it?

c) what happens when old and new ext3 or ext4 try to read/write this
   directory entry?


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