[PATCH] (3/4) BKL removal from d_move()

	nfsd_acceptable() calls permission() on a a dentry that is
not guaranteed to stay around (its child is pinned down, but there
is no promises that child won't move and nothing pins dentry itself).
Fixed, cleaned up.

fs/nfsd/nfsfh.c

@@ -45,27 +45,26 @@ int nfsd_acceptable(void *expv, struct dentry *dentry)
 	struct svc_export *exp = expv;
 	int rv;
 	struct dentry *tdentry;
+	struct dentry *parent;
 
 	if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
 		return 1;
 
-	dget(dentry);
-	read_lock(&dparent_lock);
-	for (tdentry = dentry;
-	     tdentry != exp->ex_dentry && ! IS_ROOT(tdentry);
-	     (dget(tdentry->d_parent),
-	      dput(tdentry),
-	      tdentry = tdentry->d_parent)
-		) {
+	tdentry = dget(dentry);
+	while (tdentry != exp->ex_dentry && ! IS_ROOT(tdentry)) {
 		/* make sure parents give x permission to user */
 		int err;
-		read_unlock(&dparent_lock);
-		err = permission(tdentry->d_parent->d_inode, S_IXOTH);
 		read_lock(&dparent_lock);
-		if (err < 0)
+		parent = dget(tdentry->d_parent);
+		read_unlock(&dparent_lock);
+		err = permission(parent->d_inode, S_IXOTH);
+		if (err < 0) {
+			dput(parent);
 			break;
+		}
+		dput(tdentry);
+		tdentry = parent;
 	}
-	read_unlock(&dparent_lock);
 	if (tdentry != exp->ex_dentry)
 		dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name);
 	rv = (tdentry == exp->ex_dentry);