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Date: Thu, 8 Mar 2001 11:51:37 +0100
From: Ingo Oeser <ingo.oeser@informatik.tu-chemnitz.de>
To: Anton Altaparmakov <aia21@cam.ac.uk>
Cc: Rik van Riel <riel@conectiva.com.br>, Andrew Morton <andrewm@uow.edu.au>,
        linux-kernel@vger.kernel.org
Subject: Re: Questions - Re: [PATCH] documentation for mm.h
Message-ID: <20010308115137.M27675@nightmaster.csn.tu-chemnitz.de>
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In-Reply-To: <5.0.2.1.2.20010308095213.00a59040@pop.cus.cam.ac.uk>; from aia21@cam.ac.uk on Thu, Mar 08, 2001 at 10:11:50AM +0000
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On Thu, Mar 08, 2001 at 10:11:50AM +0000, Anton Altaparmakov wrote:
> At 22:33 07/03/2001, Rik van Riel wrote:
> [snip]
> >  typedef struct page {
> >+       struct list_head list;          /* ->mapping has some page lists. */
> >+       struct address_space *mapping;  /* The inode (or ...) we belong to. */
> >+       unsigned long index;            /* Our offset within mapping. */
> 
> Assuming index is in bytes (it looks like it is): 

isn't. To get the byte offset, you have to multiply it by PAGE_{CACHE_,}SIZE.

> [snip]
> >+ * During disk I/O, PG_locked is used. This bit is set before I/O
> >+ * and reset when I/O completes. page->wait is a wait queue of all
> >+ * tasks waiting for the I/O on this page to complete.
> 
> Is this physical I/O only or does it include a driver writing/reading the page?

Depends on the method of the driver, that is getting called.
-- 
10.+11.03.2001 - 3. Chemnitzer LinuxTag <http://www.tu-chemnitz.de/linux/tag>
         <<<<<<<<<<<<       come and join the fun       >>>>>>>>>>>>
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