linux-kernel - Re: [PATCH 3/3] Add a pair of system calls to make extended file stats available [ver #2]

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Date:	Wed, 30 Jun 2010 09:55:51 +0100
From:	David Howells <dhowells@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	dhowells@...hat.com, viro@...iv.linux.org.uk, smfrench@...il.com,
	jlayton@...hat.com, mcao@...ibm.com,
	aneesh.kumar@...ux.vnet.ibm.com, linux-cifs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	samba-technical@...ts.samba.org, sjayaraman@...e.de,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/3] Add a pair of system calls to make extended file stats available [ver #2]

Arnd Bergmann <arnd@...db.de> wrote:

> I think it would be better to leave the structure as write-only from
> the kernel

Why?

> and pass the query_flags and struct_version as syscall arguments, though it
> makes sense to store them in the result as well.

The problem with that is that the number of syscall arguments is limited, and
there is no SYSCALL_DEFINE7.

On the other hand, I could make a separate argument block struct and pass a
pointer to it...

David
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