From: Valerie Aurora <vaurora@redhat.com>
To: Miklos Szeredi <miklos@szeredi.hu>,
Trond Myklebust <Trond.Myklebust@netapp.com>,
"J. Bruce Fields" <bfields@fieldses.org>
Cc: Neil Brown <neilb@suse.de>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
viro@zeniv.linux.org.uk, jblunck@suse.de, hch@infradead.org
Subject: Re: [PATCH 0/5] hybrid union filesystem prototype
Date: Tue, 31 Aug 2010 15:18:46 -0400 [thread overview]
Message-ID: <20100831191846.GA5759@shell> (raw)
In-Reply-To: <E1Oq3Lz-0004D8-MP@pomaz-ex.szeredi.hu>
On Mon, Aug 30, 2010 at 02:20:47PM +0200, Miklos Szeredi wrote:
> On Mon, 30 Aug 2010, Neil Brown wrote:
>
> > Val has been following that approach and asking if it is possible to make an
> > NFS filesystem really-truly read-only. i.e. no changes.
> > I don't believe it is.
>
> Perhaps it doesn't matter. The nasty cases can be prevented by just
> disallowing local modification. For the rest NFS will return ESTALE:
> "though luck, why didn't you follow the rules?"
I agree: Ask the server to keep it read-only, but also detect if it
lied to prevent kernel bugs on the client.
Is detecting ESTALE and failing the mount sufficient to detect all
cases of a cached directory being altered? I keep trying to trap an
NFS developer and beat the answer out of him but they usually get hung
up on the impossibility of 100% enforcement of the read-only server
option. (Agreed, impossible, just give the sysadmin a mount option so
that it doesn't happen accidentally.)
-VAL
next prev parent reply other threads:[~2010-08-31 19:18 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-26 18:33 [PATCH 0/5] hybrid union filesystem prototype Miklos Szeredi
2010-08-26 18:33 ` [PATCH 1/5] vfs: implement open "forwarding" Miklos Szeredi
2010-08-26 18:33 ` [PATCH 2/5] vfs: make i_op->permission take a dentry instead of an inode Miklos Szeredi
2010-08-26 20:24 ` David P. Quigley
2010-08-27 4:11 ` Neil Brown
2010-08-27 18:13 ` David P. Quigley
2010-08-27 19:21 ` Valerie Aurora
2010-08-27 18:31 ` David P. Quigley
2010-08-26 18:33 ` [PATCH 3/5] vfs: add flag to allow rename to same inode Miklos Szeredi
2010-08-26 18:33 ` [PATCH 4/5] vfs: export do_splice_direct() to modules Miklos Szeredi
2010-08-26 18:33 ` [PATCH 5/5] union: hybrid union filesystem prototype Miklos Szeredi
2010-09-01 21:42 ` Valerie Aurora
2010-09-02 9:19 ` Miklos Szeredi
2010-09-02 21:33 ` Valerie Aurora
2010-09-03 5:10 ` Neil Brown
2010-09-03 9:16 ` Miklos Szeredi
2010-09-09 16:02 ` David P. Quigley
2010-09-03 8:52 ` Miklos Szeredi
2010-09-02 21:42 ` Valerie Aurora
2010-09-03 12:31 ` Miklos Szeredi
2010-08-27 7:05 ` [PATCH 0/5] " Neil Brown
2010-08-27 8:47 ` Miklos Szeredi
2010-08-27 11:35 ` Neil Brown
2010-08-27 16:53 ` Miklos Szeredi
2010-08-29 4:42 ` Neil Brown
2010-08-30 10:18 ` Miklos Szeredi
2010-08-30 11:40 ` Neil Brown
2010-08-30 12:20 ` Miklos Szeredi
2010-08-31 19:18 ` Valerie Aurora [this message]
2010-08-31 20:19 ` Trond Myklebust
2010-09-01 1:56 ` Valerie Aurora
2010-09-01 4:04 ` Trond Myklebust
2010-09-01 4:33 ` Neil Brown
2010-09-01 20:11 ` Miklos Szeredi
2010-08-31 19:29 ` Valerie Aurora
2010-09-02 13:15 ` Jan Engelhardt
2010-09-02 13:32 ` Neil Brown
2010-09-02 14:25 ` Jan Engelhardt
2010-09-02 14:28 ` Miklos Szeredi
2010-09-08 19:47 ` David P. Quigley
2010-09-23 13:18 ` Jan Engelhardt
2010-09-23 19:22 ` Valerie Aurora
2010-08-30 18:38 ` Valerie Aurora
2010-08-30 23:12 ` Neil Brown
2010-08-31 11:00 ` Miklos Szeredi
2010-08-31 11:24 ` Neil Brown
2010-08-31 15:05 ` Kyle Moffett
2010-08-31 20:36 ` Valerie Aurora
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