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