From: Michael Richardson <mcr@sandelman.ottawa.on.ca>
Subject: Re: force unmount not working 2.4.22
Date: Mon, 11 Oct 2004 18:55:02 -0400
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <23029.1097535302@marajade.sandelman.ottawa.on.ca>
References: <20041011220942.96898.qmail@web20525.mail.yahoo.com>
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Cc: Garrick Staples <garrick@usc.edu>, nfs@lists.sourceforge.net
To: Goutham Kurra <kurrag1@yahoo.com>
In-Reply-To: Message from Goutham Kurra <kurrag1@yahoo.com>
   of "Mon, 11 Oct 2004 15:09:42 PDT." <20041011220942.96898.qmail@web20525.mail.yahoo.com>
Errors-To: nfs-admin@lists.sourceforge.net

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>>>>> "Goutham" == Goutham Kurra <kurrag1@yahoo.com> writes:
    Goutham> I can see that '-f' tries to stop all active rpc tasks to
    Goutham> the server, but I guess the reference counts on the mount
    Goutham> are not dropped. What would be cool is a 'brute-force'
    Goutham> option that kills any process that still holds a reference
    Goutham> to the filesystem and then also unmounts it.

  A good idea, but there are still things that "kill -9" won't kill, and
people who don't understand why we need it. "Fix the application" they say.

  A better idea is that -f goes into the file table, and makes all of
the references duds. When the applications writes, they get an I/O
error, and when they read, they get EOF or I/O error.

    Goutham> The problem with using something like fuser is that it will
    Goutham> promptly hang on an unreachable server making it useless on
    Goutham> nfs filesystems.

    Goutham> Any ideas on what to do in this case (i.e, unreachable NFS
    Goutham> server, plus a bunch of processes hung on the mount)?

  Yes, a shame. Perhaps we can fix fuser as well?

    Goutham> I'm uncomfortable using lazy unmounts as I don't have a way
    Goutham> of knowing if the filesystem has finally been dropped or
    Goutham> not.

  For critical stuff, using lazy or soft mounts is not a good idea.

- --
]     "Elmo went to the wrong fundraiser" - The Simpson         |  firewalls  [
]   Michael Richardson,    Xelerance Corporation, Ottawa, ON    |net architect[
] mcr@xelerance.com      http://www.sandelman.ottawa.on.ca/mcr/ |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [

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