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

[John Hughes <john@calvaedi.com>]

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?)