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From: Alexander Kabaev <kan@FreeBSD.org>
Date: Tue, 14 Apr 2009 23:46:58 +0000 (UTC)
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Subject: svn commit: r191081 - head/sys/kern
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Author: kan
Date: Tue Apr 14 23:46:57 2009
New Revision: 191081
URL: http://svn.freebsd.org/changeset/base/191081

Log:
  Fix yet another negative dotodot entry fallout.
  
  Reported by: pho

Modified:
  head/sys/kern/vfs_cache.c

Modified: head/sys/kern/vfs_cache.c
==============================================================================
--- head/sys/kern/vfs_cache.c	Tue Apr 14 23:05:36 2009	(r191080)
+++ head/sys/kern/vfs_cache.c	Tue Apr 14 23:46:57 2009	(r191081)
@@ -421,6 +421,18 @@ retry_wlocked:
 				*vpp = dvp->v_cache_dd->nc_vp;
 			else
 				*vpp = dvp->v_cache_dd->nc_dvp;
+			/* Return failure if negative entry was found. */
+			if (*vpp == NULL) {
+				numneghits++;
+				nchstats.ncs_neghits++;
+				SDT_PROBE(vfs, namecache, lookup, hit_negative,
+				    dvp, "..", 0, 0, 0);
+				if (wlocked)
+					CACHE_WUNLOCK();
+				else
+					CACHE_RUNLOCK();
+				return (ENOENT);
+			}
 			CTR3(KTR_VFS, "cache_lookup(%p, %s) found %p via ..",
 			    dvp, cnp->cn_nameptr, *vpp);
 			SDT_PROBE(vfs, namecache, lookup, hit, dvp, "..",