Re: [PATCH] IDE: Do not call bh_phys() on buffers with invalid

Benjamin Herrenschmidt (benh@kernel.crashing.org)
29 Jan 2003 16:44:15 +0100

On Wed, 2003-01-29 at 16:38, Jens Axboe wrote:
> No, any b_data < PAGE_OFFSET is not wrong, that's the point. For highmem
> b_page, b_data will be the offset into the page. So it could be 2048,
> for instance.

In the other if() case, yes ;)

> The test is meant to catch an invalid buffer_head, where b_page is not
> set but b_data isn't valid either. So to make it complete, you could do:

Yup, I undestood that.

> if (bh->b_data < PAGE_SIZE)
> BUG();
> if (bh->b_data < PAGE_OFFSET)
> BUG();
> }

All I wanted to spot is that < PAGE_OFFSET would catch the PAGE_SIZE bug
as well ;) But that's not a problem in real life anyway it seems.

-- 
Benjamin Herrenschmidt <benh@kernel.crashing.org>
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