Messages in this thread | | | Date | Wed, 27 Oct 2004 08:52:39 -0700 | From | "Martin J. Bligh" <> | Subject | Re: news about IDE PIO HIGHMEM bug (was: Re: 2.6.9-mm1) |
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> Bartlomiej Zolnierkiewicz wrote: >> We have stuct page of the first page and a offset. >> We need to obtain struct page of the current page and map it. > > > Opening this question to a wider audience. > > struct scatterlist gives us struct page*, and an offset+length pair. The struct page* is the _starting_ page of a potentially multi-page run of data. > > The question: how does one get struct page* for the second, and successive pages in a known-contiguous multi-page run, if one only knows the first page?
If it's a higher order allocation, just page+1 should be safe. If it just happens to be contig, it might cross a discontig boundary, and not obey that rule. Very unlikely, but possible.
M.
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