simple local filesystems: switch to ->iterate_shared()

no changes needed (XFS isn't simple, but it has the same parallelism
in the interesting parts exercised from CXFS).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/sysv/dir.c

@@ -23,7 +23,7 @@ static int sysv_readdir(struct file *, struct dir_context *);
 const struct file_operations sysv_dir_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= sysv_readdir,
+	.iterate_shared	= sysv_readdir,
 	.fsync		= generic_file_fsync,
 };