linux-ext4 - Re: Interface for the new fallocate() system call

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Message-ID: <20070424121632.GA10136@amitarora.in.ibm.com>
Date:	Tue, 24 Apr 2007 17:46:33 +0530
From:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>
To:	Jakub Jelinek <jakub@...hat.com>
Cc:	Andreas Dilger <adilger@...sterfs.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, xfs@....sgi.com, cmm@...ibm.com,
	suparna@...ibm.com, Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org
Subject: Re: Interface for the new fallocate() system call

On Fri, Apr 20, 2007 at 10:59:18AM -0400, Jakub Jelinek wrote:
> On Fri, Apr 20, 2007 at 07:21:46PM +0530, Amit K. Arora wrote:
> > Ok.
> > In this case we may have to consider following things:
> > 
> > 1) Obviously, for this glibc will have to call fallocate() syscall with
> > different arguments on s390, than other archs. I think this should be
> > doable and should not be an issue with glibc folks (right?).
> 
> glibc can cope with this easily, will just add
> sysdeps/unix/sysv/linux/s390/fallocate.c or something similar to override
> the generic Linux implementation.
> 
> > 2) we also need to see how strace behaves in this case. With little
> > knowledge that I have of strace, I don't think it should depend on
> > argument ordering of a system call on different archs (since it uses
> > ptrace internally and that should take care of it). But, it will be
> > nice if someone can confirm this.
> 
> strace would solve this with #ifdef mess, it already does that in many
> places so guess another few lines don't make it significantly worse.

I will work on the revised fallocate patchset and will post it soon.

Thanks!
--
Regards,
Amit Arora
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