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From: Rick Macklem <rmacklem@FreeBSD.org>
Date: Tue, 14 Sep 2010 01:28:05 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sys/fs/nullfs null_vnops.c
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rmacklem    2010-09-14 01:28:05 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/fs/nullfs        null_vnops.c 
  Log:
  SVN rev 212590 on 2010-09-14 01:28:05Z by rmacklem
  
  MFC: r212043
  Add a null_remove() function to nullfs, so that the v_usecount
  of the lower level vnode is incremented to greater than 1 when
  the upper level vnode's v_usecount is greater than one. This
  is necessary for the NFS clients, so that they will do a silly
  rename of the file instead of actually removing it when the
  file is still in use. It is "racy", since the v_usecount is
  incremented in many places in the kernel with
  minimal synchronization, but an extraneous silly rename is
  preferred to not doing a silly rename when it is required.
  The only other file systems that currently check the value
  of v_usecount in their VOP_REMOVE() functions are nwfs and
  smbfs. These file systems choose to fail a remove when the
  v_usecount is greater than 1 and I believe will function
  more correctly with this patch, as well.
  
  Revision   Changes    Path
  1.111.2.2  +27 -0     src/sys/fs/nullfs/null_vnops.c