linux-ext4 - Re: [RFC][PATCH] sys_fallocate() system call

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Date:	Mon, 19 Mar 2007 12:23:12 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, xfs@....sgi.com,
	Andrew Morton <akpm@...ux-foundation.org>, suparna@...ibm.com,
	cmm@...ibm.com, alex@...sterfs.com, suzuki@...ibm.com,
	Matthew Wilcox <matthew@....cx>,
	Paul Mackerras <paulus@...ba.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Russell King <rmk+lkml@....linux.org.uk>
Subject: Re: [RFC][PATCH] sys_fallocate() system call

On Mon, Mar 19, 2007 at 02:54:04PM +0530, Amit K. Arora wrote:
> On Fri, Mar 16, 2007 at 04:21:03PM +0100, Heiko Carstens wrote:
> > On Fri, Mar 16, 2007 at 08:01:01PM +0530, Amit K. Arora wrote:
> > >  asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len)
> > > 
> > > Currently we have two modes FA_ALLOCATE and FA_DEALLOCATE, for
> > > preallocation and deallocation of preallocated blocks respectively. More
> > > modes can be added, when required. And these modes can be renamed, since
> > > I am sure these are no way the best ones ! :)
> > > 
> Yes, the problem was adding compat wrapper for this. I will appreciate
> your help in writing it. Only thing is that we might have to wait till
> the order of the arguments is decided upon. Thanks!

There is probably not much choice. If you want to stay with the loff_t
arguments it won't work on 31-bit s390 or 32-bit powerpc dependent on the
order of the arguments.
So you should go for what Matthew Wilcox suggested:

asmlinkage long sys_fallocate(int fd, int mode, u32 off_low, u32 off_high,
			      u32 len_low, u32 len_high);

That way it will work an all architectures and in addition no architecture
has to do some magic to combine the splitted 64 bit arguments in compat
mode.
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