From: "Adam J. Richter" <adam@yggdrasil.com>
To: akpm@zip.com.au
Cc: axboe@suse.de, linux-kernel@vger.kernel.org
Subject: Re: bio_chain: proposed solution for bio_alloc failure and large IO simplification
Date: Sat, 15 Jun 2002 13:24:43 -0700 [thread overview]
Message-ID: <200206152024.NAA02772@adam.yggdrasil.com> (raw)
>> 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.
If that scenario did happen, by the way, it would still
be safe. If you cannot handle the larger request for some reason
that is not apparent to q->one_more_bvec, then you would make
your own one_more_bvec routine (probably a wrapper).
Adam J. Richter __ ______________ 575 Oroville Road
adam@yggdrasil.com \ / Milpitas, California 95035
+1 408 309-6081 | g g d r a s i l United States of America
"Free Software For The Rest Of Us."
next reply other threads:[~2002-06-15 20:24 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-15 20:24 Adam J. Richter [this message]
2002-06-17 6:37 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2002-06-15 20:01 Adam J. Richter
2002-06-15 20:22 ` Andrew Morton
2002-06-15 10:30 Adam J. Richter
2002-06-15 19:50 ` Andrew Morton
2002-06-17 6:36 ` Jens Axboe
2002-06-17 7:09 ` Andrew Morton
2002-06-15 9:10 Adam J. Richter
2002-06-15 9:14 ` Jens Axboe
2002-06-15 8:52 Adam J. Richter
2002-06-15 9:00 ` Jens Axboe
2002-06-15 8:45 Adam J. Richter
2002-06-15 8:50 ` Jens Axboe
2002-06-15 4:38 Adam J. Richter
2002-06-15 0:22 Adam J. Richter
2002-06-14 23:39 Adam J. Richter
2002-06-14 23:58 ` Andrew Morton
2002-06-15 1:38 ` Oliver Xymoron
2002-06-15 7:55 ` Jens Axboe
2002-06-14 16:52 Adam J. Richter
2002-06-14 23:00 ` Andrew Morton
2002-06-14 23:29 ` William Lee Irwin III
2002-06-14 23:38 ` Andrew Morton
2002-06-15 7:55 ` Jens Axboe
2002-06-14 1:56 Adam J. Richter
2002-06-14 2:24 ` Andreas Dilger
2002-06-14 14:57 ` Jens Axboe
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