D_LOOKUP in REAL_LOOKUP?

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Subject: D_LOOKUP in REAL_LOOKUP?
From: krushnaal pai <krisonearth@xxxxxxxxx>
Date: Tue, 31 Mar 2009 11:31:34 +0530

in kernel 2.6.11
to retrieve a particular file the kernel calls d_lookup to check cache but if it is not found in dcache ,kernel calls real_lookup to search the hard disk.
however inside real_lookup the kernel again calls d_lookup . can someone plz explain why?

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