vfs-scale, d_revalidate from nfsd

[J. R. Okajima]

NFSD calls filesystem's ->d_revalidate() with the parameter nd == NULL.
So every
	if (nd->flags & LOOKUP_RCU)
		return -ECHILD;
code which was added to ->d_revalidate() of FS which supports NFS
exporting will crash.

If we rewrite it as
	if (nd && (nd->flags & LOOKUP_RCU))
		return -ECHILD;
the problem may not occur.
But I am not sure whether lookup_one_len() call in NFSD support rcu-walk.


J. R. Okajima
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/