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

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Date:	Wed, 22 Jul 2009 11:52:21 +0200
From:	Jan Kara <jack@...e.cz>
To:	Theodore Tso <tytso@....edu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, 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 21-07-09 17:35:48, Theodore Tso wrote:
> 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".
  That's a good point. I'll write a cleanup patch at least for the obvious
offenders.

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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