From owner-cvs-all  Wed Sep 29 10:16:56 1999
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From: Matt Dillon <dillon@FreeBSD.org>
Date: Wed, 29 Sep 1999 10:14:59 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/nfs nfs_serv.c
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dillon      1999/09/29 10:14:59 PDT

  Modified files:
    sys/nfs              nfs_serv.c 
  Log:
      Make FreeBSD less conservative in determining when to return a cookie
      error for a directory.  I have made this change after a great deal of
      review although I cannot be absolutely sure that this meets the spec.
  
      The issue devolves into whether changes in an underlying (UFS) directory
      can cause NFS directory blocks to be renumbered.  My read of the code
      indicates that NFS directory blocks will not be renumbered, which means
      that the cookies should still remain valid after a change is made to
      the underlying directory.  This being the case, a cookie error should
      not be returned when a change is made to the underlying directory and,
      instead, the NFS client should rely on mtime detection to invalidate and
      reload the directory.
  
      The use of mtime is problematic in of itself, due to insufficient
      resolution, which is why I believe the original conservative error
      handling was done.  Still, there have been dozens of bug reports by
      people needing solaris<->FreeBSD interoperability and these have to
      be accomodated.
  
  Revision  Changes    Path
  1.86      +5 -1      src/sys/nfs/nfs_serv.c



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