From: Jens Axboe <axboe@suse.de>
To: Luben Tuikov <luben@splentec.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: struct page question
Date: Thu, 26 Sep 2002 07:33:09 +0200 [thread overview]
Message-ID: <20020926053309.GD8665@suse.de> (raw)
In-Reply-To: <3D922313.24B59088@splentec.com>
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
prev parent 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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