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

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Message-ID: <Pine.LNX.4.61.0703292002210.31834@yvahk01.tjqt.qr>
Date:	Thu, 29 Mar 2007 20:05:24 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
cc:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>, torvalds@...l.org,
	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, suparna@...ibm.com, cmm@...ibm.com
Subject: Re: Interface for the new fallocate() system call

 
On Mar 29 2007 13:18, linux-os (Dick Johnson) wrote:
>
>I think it's always better to put only a pointer on the stack as
>above.

I have to disagree, since wrapping it into a struct and copying the struct
in kernelspace from userspace requires more code. Pointers only become
useful at 3 (rarely) or 4 (yeah, more likely) and 5+ (definitely)
arguments, (3) see above about copying, (4) middle thing and (5) tons of
arguments like mmap() should be wrapped up... for simplicity of dealing
with it later.


Jan
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