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

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Message-ID: <32322.1277854192@redhat.com>
Date:	Wed, 30 Jun 2010 00:29:52 +0100
From:	David Howells <dhowells@...hat.com>
To:	Joel Becker <Joel.Becker@...cle.com>
Cc:	dhowells@...hat.com, 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

Joel Becker <Joel.Becker@...cle.com> wrote:

> 	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.

I was thinking of the fixed length xstat struct plus appendable extensions to
be defined later.

I could live with each defined extension being of a fixed length, so for
example, you set bit 20, and it adds, say, a 16-byte volume ID in the
appropriate order, padded out appropriately for the filesystem.

David
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