switch jfs to ->s_d_op, close exportfs races

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 3150d76..eeca48a 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -515,6 +515,9 @@
 
 	sb->s_magic = JFS_SUPER_MAGIC;
 
+	if (sbi->mntflag & JFS_OS2)
+		sb->s_d_op = &jfs_ci_dentry_operations;
+
 	inode = jfs_iget(sb, ROOT_I);
 	if (IS_ERR(inode)) {
 		ret = PTR_ERR(inode);
@@ -524,9 +527,6 @@
 	if (!sb->s_root)
 		goto out_no_root;
 
-	if (sbi->mntflag & JFS_OS2)
-		d_set_d_op(sb->s_root, &jfs_ci_dentry_operations);
-
 	/* logical blocks are represented by 40 bits in pxd_t, etc. */
 	sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 #if BITS_PER_LONG == 32