lkml.org 
[lkml]   [2011]   [Nov]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Add "-e" option to rpc.gssd to allow error on ticket expiry. Try 2 with added man pages.
On 11/18/2011 11:37 PM, Trond Myklebust wrote:
> On Fri, 2011-11-18 at 23:33 +0100, John Hughes wrote:
>
>> 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,
>>
> What part of "write is asynchronous" is so hard to understand?
>

If write succeeds,
and the write rpc fails
and data is lost
and fsync succeeds
then the nfs client is broken.

d'accord?

>
>> 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
>>
> Which is _exactly_ how it works today, so what is the problem?
>
>
Well, the hang after step 1a.

If there is to be a hang I'd like it when the fsync is done.

(And no hang if no fsync).




\
 
 \ /
  Last update: 2011-11-18 23:49    [W:0.034 / U:0.288 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site