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From: Alexander Kabaev <kan@FreeBSD.org>
Date: Fri, 17 Apr 2009 21:18:17 +0000 (UTC)
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Subject: svn commit: r191224 - in releng/7.2/sys: . contrib/pf
	dev/ath/ath_hal dev/cxgb kern
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Author: kan
Date: Fri Apr 17 21:18:17 2009
New Revision: 191224
URL: http://svn.freebsd.org/changeset/base/191224

Log:
  MFC r191218 and related backout r191220.
  
  More fallout from negative dotdot caching. Negative entries should
  be removed from and reinserted to proper ncneg list.
  
  Reported by:	pho
  Submitted by:	kib
  Approved by:	re (kib)

Modified:
  releng/7.2/sys/   (props changed)
  releng/7.2/sys/contrib/pf/   (props changed)
  releng/7.2/sys/dev/ath/ath_hal/   (props changed)
  releng/7.2/sys/dev/cxgb/   (props changed)
  releng/7.2/sys/kern/vfs_cache.c

Modified: releng/7.2/sys/kern/vfs_cache.c
==============================================================================
--- releng/7.2/sys/kern/vfs_cache.c	Fri Apr 17 21:10:53 2009	(r191223)
+++ releng/7.2/sys/kern/vfs_cache.c	Fri Apr 17 21:18:17 2009	(r191224)
@@ -535,18 +535,23 @@ cache_enter(dvp, vp, cnp)
 			 * to new parent vnode, otherwise continue with new
 			 * namecache entry allocation.
 			 */
-			if ((ncp = dvp->v_cache_dd) != NULL) {
-				if (ncp->nc_flag & NCF_ISDOTDOT) {
-					KASSERT(ncp->nc_dvp == dvp,
-					    ("wrong isdotdot parent"));
+			if ((ncp = dvp->v_cache_dd) != NULL &&
+			    ncp->nc_flag & NCF_ISDOTDOT) {
+				KASSERT(ncp->nc_dvp == dvp,
+				    ("wrong isdotdot parent"));
+				if (ncp->nc_vp != NULL)
 					TAILQ_REMOVE(&ncp->nc_vp->v_cache_dst,
 					    ncp, nc_dst);
+				else
+					TAILQ_REMOVE(&ncneg, ncp, nc_dst);
+				if (vp != NULL)
 					TAILQ_INSERT_HEAD(&vp->v_cache_dst,
 					    ncp, nc_dst);
-					ncp->nc_vp = vp;
-					CACHE_UNLOCK();
-					return;
-				}
+				else
+					TAILQ_INSERT_TAIL(&ncneg, ncp, nc_dst);
+				ncp->nc_vp = vp;
+				CACHE_UNLOCK();
+				return;
 			}
 			dvp->v_cache_dd = NULL;
 			CACHE_UNLOCK();