linux-ext4 - Re: [PATCH 3/3] Add a pair of system calls to make extended file stats available

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Date:	Tue, 29 Jun 2010 15:48:44 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Ulrich Drepper <drepper@...il.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

On Tue, Jun 29, 2010 at 11:36:56PM +0100, David Howells wrote:
> Ulrich Drepper <drepper@...il.com> wrote:
> > And while you're at it, maybe some spare fields at the end are nice.
> 
> I made it so that the syscall can return variable length data: the main xstat
> struct, plus extra records yet to be defined.  They could even be variable
> length and assembled/disassembled with something like the control message
> macros for recvmsg().

	The less variable length stuff the better, I think.  At least,
for the stuff stat(2) already returns, you should have a fixed-size
structure.  Even if I only pass the GIVE_ME_UIDS flag, I don't want to
have to deal with the variable size stuff until I've actually asked for
esoteric things.  I'll know that the non-UIDS fields are garbage by the
fact that I didn't ask for them.

Joel

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Joel Becker
Consulting Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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