linux-kernel - Re: [PATCH 3/4] vfs: change sb->s_maxbytes to a loff

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Message-id: <20090807201447.GQ3340@webber.adilger.int>
Date:	Fri, 07 Aug 2009 14:14:47 -0600
From:	Andreas Dilger <adilger@....com>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, hch@...radead.org, rlove@...gle.com,
	msb@...gle.com, viro@...iv.linux.org.uk, hannes@...xchg.org
Subject: Re: [PATCH 3/4] vfs: change sb->s_maxbytes to a loff_t

On Aug 07, 2009  14:57 -0400, Jeff Layton wrote:
> +	/*
> +	 * filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE
> +	 * but s_maxbytes was an unsigned long long for many releases. Throw
> +	 * this warning for a little while to try and catch filesystems that
> +	 * violate this rule. This warning can be removed in 2.6.34.
> +	 */
> +	WARN(((unsigned long long) mnt->mnt_sb->s_maxbytes > MAX_LFS_FILESIZE),
> +		"WARNING: %s sets sb->s_maxbytes too large (%llu)", type->name,
> +		(unsigned long long) mnt->mnt_sb->s_maxbytes);

Rather than removing this check, it should be changed into a BUG_ON() so
that no filesystems are added/modified to get it wrong.  We hit this
problem once in the past also...

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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