linux-kernel - The relationship between flag: BH_Uptodate & BH_Dirty in buffer

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Message-ID: <6ec09bb641d19e31e173f0d7f338cdfb.squirrel@webmail.nctu.edu.tw>
Date:	Sat, 22 Dec 2012 11:37:02 +0800
From:	cyhung.cs00g@...u.edu.tw
To:	linux-kernel@...r.kernel.org
Subject: The relationship between flag: BH_Uptodate & BH_Dirty in 
 buffer_head

Hi, all

I want ask a question.

As we know, structure buffer_head has a member called b_state.
And this state could be defined by many flags.

The question is that, I want to know the relationship between BH_Uptodate
& BH_Dirty.

If a data is verified, the BH_Dirty will setup, and what about BH_Uptodate?

Under what circumstance the BH_Uptodate would be set up?

Thanks. :)

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