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From: Rick Macklem <rmacklem@FreeBSD.org>
Date: Tue, 31 May 2011 18:27:18 +0000 (UTC)
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Subject: svn commit: r222541 - head/sbin/umount
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Author: rmacklem
Date: Tue May 31 18:27:18 2011
New Revision: 222541
URL: http://svn.freebsd.org/changeset/base/222541

Log:
  Add a sentence to the umount.8 man page to clarify the behaviour
  for forced dismount when used on an NFS mount point. Requested by
  Jeremy Chadwick.
  This is a content change.
  
  MFC after:	2 weeks

Modified:
  head/sbin/umount/umount.8

Modified: head/sbin/umount/umount.8
==============================================================================
--- head/sbin/umount/umount.8	Tue May 31 17:43:25 2011	(r222540)
+++ head/sbin/umount/umount.8	Tue May 31 18:27:18 2011	(r222541)
@@ -28,7 +28,7 @@
 .\"     @(#)umount.8	8.2 (Berkeley) 5/8/95
 .\" $FreeBSD$
 .\"
-.Dd July 18, 2003
+.Dd May 31, 2011
 .Dt UMOUNT 8
 .Os
 .Sh NAME
@@ -78,6 +78,9 @@ The file system is forcibly unmounted.
 Active special devices continue to work,
 but all other files return errors if further accesses are attempted.
 The root file system cannot be forcibly unmounted.
+For NFS, a forced dismount can take up to 1 minute or more to
+complete against an unresponsive server and may throw away
+data not yet written to the server for this case.
 .It Fl h Ar host
 Only file systems mounted from the specified host will be
 unmounted.