Returning error to app on TCP disconnect

Returning error to app on TCP disconnect

[Shehjar Tikoo]

Hi all

I am working on a setup where when a nfsv3 server goes down, the dd that 
is running on the NFS mount point, gets an error on any syscall 
performed on that mount point, say a write () to a file on that mount.

I've tried setting the timeo and retrans options at mount but that does 
not seem to work in this case. The how-to on linux-nfs site confirms 
that the nfs client just waits for the server to come back up after 
retrans number of requests.

Is there a way to have the app receive an EIO or any other error on TCP 
disconnect?

Thanks
-Shehjar

Re: Returning error to app on TCP disconnect

[Christopher Hawkins]

Hi Shejar, what about the "soft" mount option on the client side, and possibly "intr"? Maybe I am misunderstanding your goal but it sounds like that is what you want. 

Chris  

----- "Shehjar Tikoo" <shehjart-+FkPdpiNhgJBDgjK7y7TUQ@public.gmane.org> wrote:

> Hi all
> 
> I am working on a setup where when a nfsv3 server goes down, the dd
> that 
> is running on the NFS mount point, gets an error on any syscall 
> performed on that mount point, say a write () to a file on that
> mount.
> 
> I've tried setting the timeo and retrans options at mount but that
> does 
> not seem to work in this case. The how-to on linux-nfs site confirms 
> that the nfs client just waits for the server to come back up after 
> retrans number of requests.
> 
> Is there a way to have the app receive an EIO or any other error on
> TCP 
> disconnect?
> 
> Thanks
> -Shehjar
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