On Thu, Dec 12, 2013 at 08:06:09PM +0100, Andreas Gruenbacher wrote:

quoted

+	/*
+	 * A filesystem can force a ACL callback by just never filling the
+	 * ACL cache. But normally you'd fill the cache either at inode
+	 * instantiation time, or on the first ->get_acl call.
+	 *
+	 * If the filesystem doesn't have a get_acl() function at all, we'll
+	 * just create the negative cache entry.
+	 */
+	if (!inode->i_op->get_acl) {
+		set_cached_acl(inode, type, NULL);
+		return ERR_PTR(-EAGAIN);

The function should return NULL here.

Indeed.  EAGAIN is the convention check_acl() in fs/namei.c uses,
but it will return that automatically if we just return NULL here.

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