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Re: [RFC][PATCH] sys_fallocate() system call

To: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Subject: Re: [RFC][PATCH] sys_fallocate() system call
From: "Amit K. Arora" <aarora@xxxxxxxxxxxxxxxxxx>
Date: Mon, 19 Mar 2007 14:54:04 +0530
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, suparna@xxxxxxxxxx, cmm@xxxxxxxxxx, alex@xxxxxxxxxxxxx, suzuki@xxxxxxxxxx
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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:
> > First of all, thanks for the overwhelming response!
> > 
> > Based on the suggestions received, I have added a new parameter to the
> > sys_fallocate() system call - an interger called "mode", just after the
> > "fd". Now the system call looks like this:
> > 
> >  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 ! :)
> > 
> > Attached below is the patch which implements this system call. It has
> > been currently implemented and tested on i386, ppc64 and x86_64
> > architectures. I am facing some problems while trying to implement this
> > on s390, and thus the delay. While I try to get it right on s390(x), we
> > thought of posting this patch, so that we can save some time. Parallely
> > we will work on getting the patch work on s390, and probably it will
> > come as a separate patch.
> What's the problem you face on s390? If it's just the compat wrapper, you
> may look at sys_sync_file_range_wrapper. Or I will send a patch if needed.

Hi Heiko,

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!

Amit Arora

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