Re: D_LOOKUP in REAL_LOOKUP?

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Hi, just a short comment :) !

On Fri, Apr 3, 2009 at 6:15 PM, pradeep singh <pradeep.rautela@xxxxxxxxx> wrote:
> On Tue, Mar 31, 2009 at 11:31 AM, krushnaal pai <krisonearth@xxxxxxxxx> wrote:
>> 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?
>
> Because while you were waiting/sleeping for semaphore to be acquired.
> Someone else might have actually read the contents into dentry cache.
> So, why do a lookup!
>
> Just to speed things up, it is a clever trick.
>
> Comments tell it.

Betcha! This kind of trick really opens my eyes to think literally! :D

regards,

Mulyadi.

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