linux-kernel - Re: [osol-code] [PATCH v2] Add preadv and pwritev system calls.

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Message-ID: <494859C9.20305@sun.com>
Date:	Tue, 16 Dec 2008 17:45:45 -0800
From:	Dan Mick <dan.mick@....com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Gerd Hoffmann <kraxel@...hat.com>, linux-arch@...r.kernel.org,
	Matthew Wilcox <matthew@....cx>,
	opensolaris-code@...nsolaris.org, linux-kernel@...r.kernel.org,
	opensolaris-rfe@...nsolaris.org,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: [osol-code] [PATCH v2] Add preadv and pwritev system calls.

Arnd Bergmann wrote:
> On Monday 15 December 2008, Gerd Hoffmann wrote:
>> Jennifer Pioch wrote:
>>> On 12/12/08, Gerd Hoffmann <kraxel@...hat.com> wrote:
>>>> Free- and OpenBSD have it too.  For Solaris I've found a feature request
>>>>  only.  Dunno about MacOS/Darwin.  Other un*xes which are important these
>>>>  days?
>>> Do you know the ID of the feature request?
>> #1167819 @ bugs.opensolaris.org
>>
> 
> Looks like they've been working on it for some time:
> "Submit Date   25-MAY-1994"!
> 
> 	Arnd <><

No one's expended any serious time on it at all, it looks like, other than 
discussion.

I see the one comment says that it can be done with lio_listio(3RT) (apparently 
in LIO_WAIT mode), and that interface does seem to offer all the preadv/pwritev
functionality.  That's not to say that we shouldn't implement preadv/pwritev 
literally, just that there should be a way to get that sort of functionality today.
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