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From: Peter Holm <pho@FreeBSD.org>
Date: Mon, 31 Oct 2011 15:01:47 +0000 (UTC)
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Subject: svn commit: r226967 - head/sys/ufs/ufs
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Author: pho
Date: Mon Oct 31 15:01:47 2011
New Revision: 226967
URL: http://svn.freebsd.org/changeset/base/226967

Log:
  The kern_renameat() looks up the fvp using the DELETE flag, which causes
  the removal of the name cache entry for fvp.
  
  Reported by:	Anton Yuzhaninov <citrin citrin ru>
  In collaboration with:	kib
  MFC after:	1 week

Modified:
  head/sys/ufs/ufs/ufs_vnops.c

Modified: head/sys/ufs/ufs/ufs_vnops.c
==============================================================================
--- head/sys/ufs/ufs/ufs_vnops.c	Mon Oct 31 10:53:27 2011	(r226966)
+++ head/sys/ufs/ufs/ufs_vnops.c	Mon Oct 31 15:01:47 2011	(r226967)
@@ -1519,6 +1519,13 @@ relock:
 		cache_purge(fdvp);
 	}
 	error = ufs_dirremove(fdvp, fip, fcnp->cn_flags, 0);
+	/*
+	 * As the relookup of the fvp is done in two steps:
+	 * ufs_lookup_ino() and then VFS_VGET(), another thread might do a
+	 * normal lookup of the from name just before the VFS_VGET() call,
+	 * causing the cache entry to be re-instantiated.
+	 */
+	cache_purge(fvp);
 
 unlockout:
 	vput(fdvp);