Messages in this thread | | | Date | Mon, 17 Jun 2002 08:37:28 +0200 | From | Jens Axboe <> | Subject | Re: bio_chain: proposed solution for bio_alloc failure and large IO simplification |
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On Sat, Jun 15 2002, Adam J. Richter wrote: > >> Can't I make a macro to do a table lookup from bio->bi_max? > > >Not really. If I do > > > bio_alloc(GFP_KERNEL, 27); > > >then I'll get a 32-slot bvec. But presumably, I don't > >want to put more than 27 pages into it. > > If you called bio_alloc with a smaller number, that would > just be the result of a small IO that you knew could not generate > more iovecs than that. So, that scenario will not happen.
But the macro lookup would fail for bios not coming from bio_alloc()
-- Jens Axboe
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