From: Daniel Phillips <phillips@arcor.de>
To: Andrew Morton <akpm@zip.com.au>, Linus Torvalds <torvalds@transmeta.com>
Cc: Suparna Bhattacharya <suparna@in.ibm.com>,
Jens Axboe <axboe@suse.de>,
linux-kernel@vger.kernel.org
Subject: Re: One more bio for for floppy users in 2.5.33..
Date: Sat, 7 Sep 2002 13:18:35 +0200 [thread overview]
Message-ID: <E17ndbo-0006SY-00@starship> (raw)
In-Reply-To: <3D77A58F.B35779A1@zip.com.au>
On Thursday 05 September 2002 20:42, Andrew Morton wrote:
> The `nr_of_sectors_completed' would be tricky to handle - we don't know how
> to bring the pagecache pages uptodate in response to a 512-byte completion.
> We'd have to teach the pagecache read functions to permit userspace to read
> from non-uptodate pages by looking at the buffer_head state. And then
> look at buffer_req to distinguish "this part of the page hasn't been read yet"
> from "this part of the page had an IO error". Ick.
It's yet another reason to have subpages, and see, keeping state
at the right granularity really does matter.
I'm just adding items to the list of reasons why we need it, so
when the time comes to do it, I won't have to waste a lot of energy
explaining why.
--
Daniel
next prev parent reply other threads:[~2002-09-07 11:12 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-03 18:00 Linus Torvalds
2002-09-03 18:02 ` Jens Axboe
2002-09-04 7:25 ` Suparna Bhattacharya
2002-09-04 16:36 ` Linus Torvalds
2002-09-05 7:03 ` Suparna Bhattacharya
2002-09-05 15:06 ` Linus Torvalds
2002-09-05 16:26 ` Andrew Morton
2002-09-05 17:05 ` Linus Torvalds
2002-09-05 18:00 ` Andrew Morton
2002-09-05 18:28 ` Linus Torvalds
2002-09-05 18:31 ` Jens Axboe
2002-09-05 18:38 ` Linus Torvalds
2002-09-05 18:38 ` Jens Axboe
2002-09-05 19:47 ` Peter Osterlund
2002-09-05 18:42 ` Andrew Morton
2002-09-05 19:03 ` Linus Torvalds
2002-09-05 19:35 ` Andrew Morton
2002-09-05 20:27 ` Linus Torvalds
2002-09-05 20:38 ` Linus Torvalds
2002-09-06 6:47 ` Helge Hafting
2002-09-06 6:59 ` Linus Torvalds
2002-09-09 14:08 ` Bob_Tracy
2002-09-05 20:48 ` Linus Torvalds
2002-09-10 7:25 ` Rogier Wolff
2002-09-10 8:01 ` Andrew Morton
2002-09-07 11:18 ` Daniel Phillips [this message]
2002-09-03 20:57 ` Mikael Pettersson
2002-09-03 21:52 ` Linus Torvalds
2002-09-03 22:33 ` Mikael Pettersson
2002-09-07 14:43 linux
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