linux-kernel - Re: [PATCH] Add "-e" option to rpc.gssd to allow error on ticket expiry. Try 2 with added man pages.

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Message-ID: <4EC6DD4D.1010008@calvaedi.com>
Date:	Fri, 18 Nov 2011 23:33:49 +0100
From:	John Hughes <john@...vaedi.com>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
CC:	Jim Rees <rees@...ch.edu>, John Hughes <john@...va.COM>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add "-e" option to rpc.gssd to allow error on ticket
 expiry. Try 2 with added man pages.

On 11/18/2011 10:03 PM, Trond Myklebust wrote:
> On Fri, 2011-11-18 at 15:57 -0500, Jim Rees wrote:
>    
>>
>> The write() syscall doesn't indicate whether the data is safe or not.  That
>> would be the close() syscall.
>>      
> fsync(). Which may succeed if the user renews their ticket first.
> However you may still have data loss if dirty data has been lost because
> of EKEYEXPIRED returns on the WRITE RPC call...
>    
Only if the write(2) returned EKEYEXPIRED, surely,
> Also, for the fsync() to return EKEYEXPIRED _after_ the user has renewed
> their ticket would seem counter-intuitive to most people.
>    

I would want to know if data was lost.

Intuition means nothing if I get an error.

If it were possible I'd like:

1. write works
1a. WRITE RPC fails, data stays in cache
2. ticket renewed
3. fsync works, data written

But:

1. write...
1a. WRITE RPC fails
1b. ... fails

seems ok.

Even

1. write works
1a WRITE RPC fails
2. ticket renewed
3. fsync fails

would be ok for me.  (light cone problems?)

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