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From: Ivan Voras <ivoras@FreeBSD.org>
Date: Thu, 23 Sep 2010 23:05:31 +0000 (UTC)
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Subject: svn commit: r213088 - stable/8/sys/fs/tmpfs
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Author: ivoras
Date: Thu Sep 23 23:05:31 2010
New Revision: 213088
URL: http://svn.freebsd.org/changeset/base/213088

Log:
  MFC r212305 : Avoid "Entry can disappear before we lock fdvp" panic.

Modified:
  stable/8/sys/fs/tmpfs/tmpfs_vnops.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/fs/tmpfs/tmpfs_vnops.c
==============================================================================
--- stable/8/sys/fs/tmpfs/tmpfs_vnops.c	Thu Sep 23 21:36:10 2010	(r213087)
+++ stable/8/sys/fs/tmpfs/tmpfs_vnops.c	Thu Sep 23 23:05:31 2010	(r213088)
@@ -902,10 +902,14 @@ tmpfs_rename(struct vop_rename_args *v)
 	fnode = VP_TO_TMPFS_NODE(fvp);
 	de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
 
-	/* Avoid manipulating '.' and '..' entries. */
+	/* Entry can disappear before we lock fdvp,
+	 * also avoid manipulating '.' and '..' entries. */
 	if (de == NULL) {
-		MPASS(fvp->v_type == VDIR);
-		error = EINVAL;
+		if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
+		    (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
+			error = EINVAL;
+		else
+			error = ENOENT;
 		goto out_locked;
 	}
 	MPASS(de->td_node == fnode);