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From: John Baldwin <jhb@FreeBSD.org>
Date: Thu, 19 Feb 2009 22:28:48 +0000 (UTC)
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Subject: cvs commit: src/sys/kern vfs_cache.c src/sys/nfsclient nfs_vnops.c
 nfsnode.h src/sys/sys vnode.h
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jhb         2009-02-19 22:28:48 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             vfs_cache.c 
    sys/nfsclient        nfs_vnops.c nfsnode.h 
    sys/sys              vnode.h 
  Log:
  SVN rev 188833 on 2009-02-19 22:28:48Z by jhb
  
  Enable caching of negative pathname lookups in the NFS client.  To avoid
  stale entries, we save a copy of the directory's modification time when
  the first negative cache entry was added in the directory's NFS node.
  When a negative cache entry is hit during a pathname lookup, the parent
  directory's modification time is checked.  If it has changed, all of the
  negative cache entries for that parent are purged and the lookup falls
  back to using the RPC.  This required adding a new cache_purge_negative()
  method to the name cache to purge only negative cache entries for a given
  directory.
  
  Submitted by:   mohans, Rick Macklem, Ricardo Labiaga @ NetApp
  Reviewed by:    mohans
  
  Revision  Changes    Path
  1.136     +18 -0     src/sys/kern/vfs_cache.c
  1.300     +53 -8     src/sys/nfsclient/nfs_vnops.c
  1.64      +1 -0      src/sys/nfsclient/nfsnode.h
  1.348     +1 -0      src/sys/sys/vnode.h