linux-kernel - Re: [PATCH 9/9] Clean up open coded inode dirty checks

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Message-ID: <Pine.LNX.4.64.0711232110400.12552@fbirervta.pbzchgretzou.qr>
Date:	Fri, 23 Nov 2007 21:16:05 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Joe Perches <joe@...ches.com>
cc:	Christoph Hellwig <hch@...radead.org>, David Chinner <dgc@....com>,
	xfs-oss <xfs@....sgi.com>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 9/9] Clean up open coded inode dirty checks


On Nov 23 2007 11:47, Joe Perches wrote:
>On Fri, 2007-11-23 at 19:16 +0100, Jan Engelhardt wrote:
>> static inline bool xfs_inode_clean(const struct xfs_inode *ip)
>> {
>> 	if (ip->i_itemp == NULL)
>> 		return true;
>> 	if (!(ip->i_itemp->ili_format.ilf_fields & XFS_ILOG_ALL) &&
>> 	    ip->i_update_core == NULL)
>> 		return true;
>> 	return false;
>> }
>
>Your code changed the test.

See - the previous cryptic constructs could not even be decoded ;-)

>xfs_inode.i_update_core is an unsigned char.
>
>I believe reordering the tests to avoid a possibly
>unnecessary dereference is better.
>
>	if (ip->i_update_core)
>		return false;
>	if (!ip->i_itemp)
>		return true;
>	return ip->i_itemp->ili_format.ilf_fields & XFS_ILOG_ALL;

Yeah, something like that.

Note: the function SHOULD return bool for this, to quash the
ilf_fields & XFS_ILOG_ALL into 0/1.
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