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Cyclic Code?

To: xfs@xxxxxxxxxxx
Subject: Cyclic Code?
From: Adil Mujeeb <mujeeb.adil@xxxxxxxxx>
Date: Mon, 9 Jan 2012 12:22:33 +0530
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Hi list,

i am new to XFS.

I was going through XFS code (2.4 based) for study purpose. Its old but assuming its bit simple as compare to latest one. Moreover the XFS code / design structure documents available on the internet is 2.4 based.

The following code snippet is not clear to me (seems cyclic):

#define XFS_IFORK_NEXTENTS(ip,w)        xfs_ifork_nextents(ip,w)
xfs_ifork_nextents(xfs_inode_t *ip, int w)
        return XFS_IFORK_NEXTENTS(ip, w);
#define XFS_IFORK_NEXTENTS(ip,w)        XFS_CFORK_NEXTENTS(&ip->i_d, w)
#define XFS_CFORK_NEXTENTS(dcp,w)            xfs_cfork_nextents(dcp,w)
xfs_cfork_nextents(xfs_dinode_core_t *dcp, int w)
        return XFS_CFORK_NEXTENTS(dcp, w);

Am i missing something? 
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