linux-ext4 - Re: [PATCH 1/5] jbd: Fail to load a journal if it is too short

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Message-ID: <20090721213548.GA6748@mit.edu>
Date:	Tue, 21 Jul 2009 17:35:48 -0400
From:	Theodore Tso <tytso@....edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/5] jbd: Fail to load a journal if it is too short

On Tue, Jul 21, 2009 at 09:19:46AM -0700, Andrew Morton wrote:
> 
> It's odd that sb->s_first/s_maxlen are 32-bit and
> journal->j_first/j_last are unsigned long.
> 
> These things will only ever be 32-bit unless we change the journal
> superblock.

In general, if there is any use of "unsigned long" in fs/ext[34], it's
probably a bug.  This is because ulong is 32-bits on x86, and 64-bits
on x86_64, so it just wastes memory space on 64-bit platforms.  The
one exception to this is if the field in question is used by the
standard bitops functions, which only functions correctly on "unsigned
long".

						- Ted
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