linux-kernel - Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]

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Message-ID: <19528.39283.469638.12844@stoffel.org>
Date:	Thu, 22 Jul 2010 15:18:11 -0400
From:	"John Stoffel" <john@...ffel.org>
To:	Jeremy Allison <jra@...ba.org>
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Volker.Lendecke@...net.de, David Howells <dhowells@...hat.com>,
	Jan Engelhardt <jengelh@...ozas.de>,
	linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended 
 file stats available [ver #6]

>>>>> "Jeremy" == Jeremy Allison <jra@...ba.org> writes:

Jeremy> On Thu, Jul 22, 2010 at 12:58:50PM -0400, Trond Myklebust wrote:
>> 
>> That would make it impossible to export the filesystem with NFSv2 and
>> v3. They do rely on ctime checking for certain operations (e.g. deciding
>> when to invalidate access and acl caches). NFSv4 needs this too if the
>> filesystem has no dedicated change attribute.
>> 
>> Still, I suppose the market for exporting the same filesystem with both
>> NFS and Samba is limited...

Jeremy> Ask NetApp about that :-). They have built a rather large
Jeremy> business on just that fact :-).

And it does work, as long as you also go with either unix or windows
semantics for the security and permissions bits.  If you try to use
the mixed-mode, you're in for a world of hurt.

Oh yeah, Netapp still uses dump/restore for it's backups.  :]  Though
whether it's still dependent on the optimization of ctime being used
to know whether to just dump the inode only or not, I can't say.

John
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