romfs, squashfs: switch to ->iterate_shared()

don't need to lock directory in ->llseek(), either
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/romfs/super.c

@@ -280,8 +280,8 @@ static struct dentry *romfs_lookup(struct inode *dir, struct dentry *dentry,
 
 static const struct file_operations romfs_dir_operations = {
 	.read		= generic_read_dir,
-	.iterate	= romfs_readdir,
-	.llseek		= default_llseek,
+	.iterate_shared	= romfs_readdir,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct inode_operations romfs_dir_inode_operations = {

fs/squashfs/dir.c

@@ -231,6 +231,6 @@ static int squashfs_readdir(struct file *file, struct dir_context *ctx)
 
 const struct file_operations squashfs_dir_ops = {
 	.read = generic_read_dir,
-	.iterate = squashfs_readdir,
-	.llseek = default_llseek,
+	.iterate_shared = squashfs_readdir,
+	.llseek = generic_file_llseek,
 };