On 11/28/2012 03:14 AM, Dave Chinner wrote:

+static long super_cache_count(struct shrinker *shrink, struct shrink_control *sc)
+{
+	struct super_block *sb;
+	long	total_objects = 0;
+
+	sb = container_of(shrink, struct super_block, s_shrink);
+
+	if (!grab_super_passive(sb))
+		return -1;
+

You're missing the GFP_FS check here. This leads to us doing all the
counting only to find out later, in the scanner, that we won't be able
to free it. Better exit early.

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