git: kernel - Fix a rare nfsnode destruction race

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxxxxx>]

commit 6ab1269c4531652932a5ae384584e6375f204779
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date:   Thu Apr 21 02:23:49 2011 -0700

    kernel - Fix a rare nfsnode destruction race
    
    * Clear np->n_vnode atomically (w/ the token held) when removing a
      node from the hash table.  The field was previously not being
      cleared at all which could race the nfsnhash lookup code despite
      the vnode interlock and check the lookup code was performing.
    
    * Remove unnecessary tokens around the remaining nfsnode freeing code
      in the reclaim path.

Summary of changes:
 sys/vfs/nfs/nfs_node.c |   20 ++++++++++++++------
 1 files changed, 14 insertions(+), 6 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/6ab1269c4531652932a5ae384584e6375f204779


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