linux-kernel - Re: fallocate-implementation-on-i86-x86

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Message-ID: <18068.10601.792839.787025@cargo.ozlabs.ibm.com>
Date:	Wed, 11 Jul 2007 10:50:49 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jeff Garzik <jeff@...zik.org>, Theodore Tso <tytso@....edu>,
	linux-kernel@...r.kernel.org, Amit Arora <aarora@...ibm.com>,
	Andi Kleen <ak@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Arnd Bergmann <arnd@...db.de>,
	"Luck, Tony" <tony.luck@...el.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Mark Fasheh <mark.fasheh@...cle.com>,
	linux-arch@...r.kernel.org
Subject: Re: fallocate-implementation-on-i86-x86_64-and-powerpc.patch

Andrew Morton writes:

> On Wed, 11 Jul 2007 09:27:40 +1000
> Paul Mackerras <paulus@...ba.org> wrote:
> 
> > We did come up with an order that worked for everybody, but that
> > discussion seemed to get totally ignored by the ext4 developers.
> 
> It was a long discussion.
> 
> Can someone please remind us what the signature of the syscall
> (and the compat handler) should be?

long sys_fallocate(loff_t offset, loff_t len, int fd, int mode)

should work for everybody.  The compat handler would be

long compat_sys_fallocate(u32 offset_hi, u32 offset_lo, u32 len_hi, u32 len_lo,
			  int fd, int mode)

for big-endian, or swap hi/lo for little-endian.  (Actually it would
be good to have an arch-dependent "stitch two args together" macro and
call them offset_0, offset_1 etc.)

Paul.
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