Re: 'umount -f /mnt/foo' fails if server IP is gone.

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On Thu, 2013-10-17 at 10:35 -0700, Ben Greear wrote:
+AD4- On 10/15/2013 11:29 AM, Ben Greear wrote:
+AD4- +AD4- Is 'umount -f' supposed to always work, even if the file server
+AD4- +AD4- goes away?
+AD4- +AD4-
+AD4- +AD4- I have a user's system that just hangs forever in this case.
+AD4- +AD4-
+AD4- +AD4- Could be local changes we have made, but I'm curious about
+AD4- +AD4- the expected behaviour before I go digging too deep...
+AD4- 
+AD4- Any input on this?  I don't mind trying to fix it, but I
+AD4- would like to know how it is supposed to work.

'umount -f' has always been iffy. It just kills any pending RPC calls
+AF8-before+AF8- trying to unmount. Since the unmount itself can trigger
writeback flushes (and hence more RPC calls), the trace you are seeing
is indeed possible.

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust+AEA-netapp.com
www.netapp.com
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