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From: Jens Axboe <>
To: Luben Tuikov <>
Cc: "" <>
Subject: Re: struct page question
Date: Thu, 26 Sep 2002 07:33:09 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Wed, Sep 25 2002, Luben Tuikov wrote:
> Jens Axboe wrote:
> > 
> > > Apparently I cannot just set b_data and b_size, b_page
> > > also has to be set and it also seems that it will
> > > not work if page_address(b_page) != b_data...
> > 
> > bh->b_page = virt_to_page(va);
> > bh->b_data = va;
> Thanks Jens again.
> My doubts are that va might not point to page->virtual,
> but may point ``in the middle'' of the page, in which case
> md will cough up since it does the page_address(b_page) != b_data
> then BUG()...

It's quite legal for b_data to point to somewhere in the middle of the
page. See usage of bh_offset(). What coughs up and where?

Jens Axboe

      reply	other threads:[~2002-09-26  5:28 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-24 21:10 struct page question Luben Tuikov
2002-09-25  7:34 ` Jens Axboe
2002-09-25 20:56   ` Luben Tuikov
2002-09-26  5:33     ` Jens Axboe [this message]

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