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From: Jeff Roberson <jeff@FreeBSD.org>
Date: Fri, 11 Apr 2008 09:48:12 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Cc: 
Subject: cvs commit: src/sys/ufs/ufs dirhash.h ufs_dirhash.c
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jeff        2008-04-11 09:48:12 UTC

  FreeBSD src repository

  Modified files:
    sys/ufs/ufs          dirhash.h ufs_dirhash.c 
  Log:
   - Use a lockmgr lock rather than a mtx to protect dirhash.  This lock
     may be held for the duration of the various dirhash operations which
     avoids many complex unlock/lock/revalidate sequences.
   - Permit shared locks on lookup.  To protect the ip->i_dirhash pointer we
     use the vnode interlock in the shared case.  Callers holding the
     exclusive vnode lock can run without fear of concurrent modification to
     i_dirhash.
   - Hold an exclusive dirhash lock when creating the dirhash structure for
     the first time or when re-creating a dirhash structure which has been
     recycled.
  
  Tested by:      kris, pho
  
  Revision  Changes    Path
  1.6       +2 -1      src/sys/ufs/ufs/dirhash.h
  1.24      +289 -227  src/sys/ufs/ufs/ufs_dirhash.c