linux-kernel - Re: NFS hang + umount -f: better behaviour requested.

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Date:	Tue, 21 Aug 2007 01:51:58 +0000 (UTC)
From:	Salah Coronya <salah.coronya@...il.com>
To:	linux-kernel@...r.kernel.org
Subject:  Re: NFS hang + umount -f: better behaviour requested.

Robin Lee Powell <rlpowell <at> digitalkingdom.org> writes:

> > Though I agree that it would be nice if we could convince all
> > subsequent requests to a server to fail EIO instead of just the
> > currently active ones.  I'm not sure that just changing "umount
> > -f" is the right interface though....  Maybe if all the server
> > handles appeared in sysfs and have an attribute which you could
> > set to cause all requests to fail...
> 
> I have no opinion on interface details, I simply know that on
> Solaris, "umount -f" Just Works, and I would love to have similar
> behaviour on Linux.
> 
> -Robin
> 

What you are looing is revoke()/frevokeat(); which will yank the file right from
under the descriptor. Its currently in -mm. Of course "mount" will still need to
iterate over each open file on the mount and revoke it.

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