linux-ext4 - Re: [PATCH 0/3] Extended file stat functions

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Message-ID: <24172.1277844640@redhat.com>
Date:	Tue, 29 Jun 2010 21:50:40 +0100
From:	David Howells <dhowells@...hat.com>
To:	Trond Myklebust <trond.myklebust@....uio.no>
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 0/3] Extended file stat functions

Trond Myklebust <trond.myklebust@....uio.no> wrote:

> There has been a lot of interest in allowing the user to specify exactly
> which fields they want the filesystem to return, and whether or not the
> kernel can use cached data or not. The main use is to allow
> specification of a 'stat light' that could help speed up
> "readdir()+multiple stat()" type queries. At last year's Filesystem and
> Storage Workshop, Mark Fasheh actually came up with an initial design:
> 
>    http://www.kerneltrap.com/mailarchive/linux-fsdevel/2009/4/7/5427274
> 
> If we're going to add in a whole new syscall for stat, should we perhaps
> revisit this discussion?

I could certainly absorb that patch.

One further consideration following on from what you said: Is it worth having
an extended getdents() that can return stat data too?  That might be useful
for NFS.

David
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