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Re: [PATCH 4/9] xfs: Use defines for CRC offsets in all cases

To: Jeff Liu <jeff.liu@xxxxxxxxxx>
Subject: Re: [PATCH 4/9] xfs: Use defines for CRC offsets in all cases
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 20 Feb 2014 11:27:13 +1100
Cc: Eric Sandeen <sandeen@xxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <530463C6.6050509@xxxxxxxxxx>
References: <1392767549-25574-1-git-send-email-sandeen@xxxxxxxxxx> <1392767549-25574-5-git-send-email-sandeen@xxxxxxxxxx> <530463C6.6050509@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Wed, Feb 19, 2014 at 03:56:54PM +0800, Jeff Liu wrote:
> Hi Eric,
> 
> I read the previous comments from Dave about using defines for CRC offsets,
> and with a grep search after applying this patch, looks there have another
> two places maybe we should switch them to the macros as well:
> 
> fs/xfs/xfs_log.c:
> Do we need a log record crc offset macros for offsetof(struct 
> xlog_rec_header, h_crc))?
> 
> xfs_dinode.h:
> we added the XFS_DINODE_CRC_OFF, just use it at below routine?
> 
> static inline uint xfs_dinode_size(int version)
> {
>         if (version == 3)
>                 return sizeof(struct xfs_dinode);
>         return offsetof(struct xfs_dinode, di_crc);
> }

No, that's a different case - it's not being used for determining
the offset of a CRC varaible - it's being used to calculate the size
of the version 2 inode core. Hence it should remain open coded like
because it has a different purpose in life....

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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