Messages in this thread | | | Date | Thu, 26 Sep 2002 07:33:09 +0200 | From | Jens Axboe <> | Subject | Re: struct page question |
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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
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